巻号一覧
42 巻, 3 号
選択された号の論文の27件中1～27を表示しています
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林 國郎1995 年 42 巻 3 号 p. 268
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (83K) -
島 進1995 年 42 巻 3 号 p. 269-276
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーImportance of investigation based on mechanics of powder compaction is emphasized: this paper deals with a study of powder compaction process by simulations based on continuum mechanics approach and based on particulate modeling. Constitutive equations for powders undergoing compaction are first briefly described and examples of application of these equations to the finite element simulation of isostatic compaction and closed-die compaction are given. Foundation of simulation based on particulate modeling is then discussed and a few examples of the simulation are described. It is pointed out that both of the methods attain their drawbacks, and therefore it is necessary to employ them so that they compensate each other for investigating the behaviour of powders during compaction processes.抄録全体を表示PDF形式でダウンロード (499K) -
高橋 清造, 中川 威雄1995 年 42 巻 3 号 p. 277-282
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーThe cylinder with flange, diameter: 40mm, thickness: 3mm is formed from alumina granule with a resin binder(3 mass% PVA) and liquid paraffin by changing the compacting rate for the purpose to investigation of the powder flowability during pressing. The density of green compact increases at higher compacting rate by flow compaction due to the increase of flange density. The punch stroke to compacting pressure is longer by flow compaction compared with that by dry compaction. When the densified powder by flow compaction at higher compacting rate flows from die inner into the flange, the density distribution in the flange becomes uniformity, and the density of green compact increases consequently.抄録全体を表示PDF形式でダウンロード (326K) -
佐藤 一太郎, 日比野 敦, 根岸 秀明1995 年 42 巻 3 号 p. 283-288
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーElectromagnetic forming have been used in a field of plastic deformation technology of metal materials. In this paper, dynamic compaction of metal powder by electromagnetic forming under hot conditions was attempted in order to investigate a possibility of electromagnetic pressure sintering. After heating in an electric furnace, a copper powder compact was put into a solenoid coil and a strong pulse current from a-condenser bank was passed through the coil.
The compact was shrinked and its density was increased by the electromagnetic pressure of the forming. The degree of densification depended on the charged voltage of the condenser, the capacitance, the current wave form of the coil and the forming temperature. Therefore, the forming process would be applicable to powder pressure sintering.
The process was applied to combustion synthesis of Ni3AI intermetallic compound. Ni/Al premixed powder compact was compressed by the forming during its thermal explosion reaction. Consequently, the density was improved in comparison to usual combustion synthesis although the synthesized product cracked.抄録全体を表示PDF形式でダウンロード (7247K) -
星野 孝二, 駒林 正士, 河野 通1995 年 42 巻 3 号 p. 289-292
発行日: 1995/03/15
公開日: 2009/12/04
ジャーナル フリーFe-Cr-Al alloy foils were fabricated by a novel process with sintering and rolling. Porous sintered sheets of Fe-Cr-Al alloys were made by tape casting, sintered, and rolled into foils. The foils were treated by heating in H2 at 1250°C. The only rolled foils were very fragile because it had many micro-cracks, but the heat-treated foils had a little flexibility. Fe-24.4Cr-9.4Al alloy foil by the process had a good heat resistance at high temperatures better than Fe-20Cr-5Al alloy foil by usual rolling method.抄録全体を表示PDF形式でダウンロード (4377K) -
田島 俊造, 堀 真一, 黒木 英憲1995 年 42 巻 3 号 p. 293-297
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーThe technology required to make fine ceramic products with complex shapes involves forming uniform and high-density compacts with fine powders of less than 1μm. To achieve this, a high speed centrifugal compaction process has been developed by the authors that applies a centrifugal force of 10k-20kG to a slip of ceramic powder in a metal die. This process offers a faster compaction rate than that of previous techniques but with no contamination.
The present study concerns an extraction method for this process. An alumina slip is loaded in a monocoque die manufactured using a fusible alloy, that places a high yield ratio and no restrictions on product shape. After centrifugal compaction, the die is melted and the compact extracted. Since the compact would be contaminated when the compact and metal become wet after the die is melted, a method in which a thin expandable film separates the die and the compact is contrived. This technique makes it possible to produce a pure compact with sintering at a low temperature of 1250°C in the atmosphere.抄録全体を表示PDF形式でダウンロード (4886K) -
浅見 淳一, 川原 正言1995 年 42 巻 3 号 p. 298-303
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーSufficient green strength can be attained for water atomized and annealed high speed steel powder with the M2 grade by use of conventional die pressing. In addition, this obtained green compact can be sintered to the full density by liquid-phase sintering. However, fine control of the sintering temperature is required for this type of eutectic sintering.
The high pressure compaction was tried to improve the sinterability on the solid-phase sintering. The two-step pressing method is applied to the high pressure compacting. High pressure up to 1470MPa can be attained by a special die assembly and apparatus. The sintered density reached to 7.4 g/cm3 with very little shrinkage in dimension by-0.8%. The radial crushing strength of sintered compacts increased in proportion to the compacting pressure.
These benefits in sinterabilty means that this is a more economic net shaping P/M process for wear-resistant machine parts.抄録全体を表示PDF形式でダウンロード (8424K) -
坂口 善樹, 原田 哲治, 久慈 俊郎, 福岡 清人, 庄野 安彦1995 年 42 巻 3 号 p. 304-308
発行日: 1995/03/15
公開日: 2009/12/04
ジャーナル フリーNd-Fe-B amorphous powders were produced by two different techniques; mechanical grinding and melt-spinning. These powders were dynamically compacted using gun method at shock pressures between 10GPa and 30GPa. When a shock pressure of 10GPa was applied, the powders were compacted into bulk form without loosing the amorphous state. The resultant bulk amorphous materials showed very low coercivities as same as the amorphous powders. On the other hand, crystallization occurred during dynamic compaction when the powders were shocked at relatively higher shock pressures. When a shock pressure of 20GPa was applied, the bulk material produced by using mechanical grinded powders had Nd2Fe14B ferromagnetic phase, but those produced by using melt-spun powders had a-Fe phase together with Nd2Fe14B phase.抄録全体を表示PDF形式でダウンロード (3008K) -
打越 哲郎, 目 義雄, 奥山 秀男1995 年 42 巻 3 号 p. 309-313
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーPressure filtration technique was applied for the consolidation of alumina small powders (average particle sizes of 20, 10 and 5nm). Suspensions were prepared by adding appropriate amount of polycarboxylic ammonium. Apparent density of the consolidated bodies decreased as the particle size becomes smaller, whereas the density was pressure-insensitive over applied pressure range of 1.5 to 10.0MPa. The kinetics and mechanics of the consolidation of the particles were discussed from the dehydration and consolidating rates of the suspensions. The transportation process of suspensions in consolidated layer was confirmed during all filtration processing as the rate limiting process.抄録全体を表示PDF形式でダウンロード (252K) -
賀集 誠一郎, 美原 康雄1995 年 42 巻 3 号 p. 314-317
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーFerroelectric PZT thick films were deposited on Ni coated SiO/Si substrates by jet printing method. Material powder was commercially used PZT fine particles which had mean diameter of 1.2μm. The shape of deposited films is 5.5mm in width and its thickness can be controlled in the range of several to several tenth um. After heat treatment of maximum temperature of 873K for 1.8ks in air, dielectric constant of 740 and dielectric loss tangent of 0.024 at 1kHz, and dielectric strength of 5MV/m were measured. The defect-free structure of the cross section of thick films was observed by SEM, and the polycrystallized PZT pattern of the surface was characterized by X-ray diffraction. Aerosol jet printing system is expected to utilize as deposition of dielectric thick films.抄録全体を表示PDF形式でダウンロード (4058K) -
植田 芳信, 鈴木 良和, 下川 勝義, 村上 和幸1995 年 42 巻 3 号 p. 318-322
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーCeramic powder dispersed or whisker-reinforced Al composite was produced by hot pressing at 973K and exposure to high temperature of 1523K. The mechanical properties and micro structures of each composite were examined by a three-point bending test, hardness tester, scanning electron microscopy, X-ray diffraction patterns and XMA analysis.
The present method was found more effective for obtaining the whisker reinforced Al composite than a powder dispersed Al composite. The powder dispersed Al composite following heattreatment at high temperature maintained its mechanical strength owing to fewer pores and cracks.抄録全体を表示PDF形式でダウンロード (3494K) -
洪 性賢, 小澤 清, 目 義雄1995 年 42 巻 3 号 p. 323-329
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリー(Fe, Co)-B and Ni-B ultrafine powders were prepared by chemical reduction of metal ions in aqueous solutions. The obtained powders have a spherical morphology with diameter of about 100 nm and amorphous structure. Electro-discharge sintering (EDS) of the powders were conducted. The gas evolution in EDS was much greater than that of resistance sintering alone, indicating that EDS contributes to cleaning of powder surfaces and reduces the oxygen content of sintered alloy. The higher was the sintering temperature during EDS or resistance sintering immediately after EDS, the higher was the density of sintered alloy. Applied pressure during EDS and subsequent resistance sintering had a great effect on density at low temperature showing that the large pores among agglomerated particles could be eliminated by high pressure. However, the effect of pressure on the sintered density was small at high temperature. It was also observed that mixed structure consisting of amorphous and crystalline phases could be obtained above crystallization temperature by EDS and subsequent rapid resistance sintering. In addition, the sintered density increased only slightly as the pulse time decreases in EDS during the above process.抄録全体を表示PDF形式でダウンロード (6092K) -
松本 章宏, 加藤 清隆, 安藤 国輔1995 年 42 巻 3 号 p. 330-335
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーNiobium aluminides are expected to be potentially structural materials for ultra-high temperature applications. We have fabricated Nb-Al powder into near net shape by injection molding process. In order to improve sinterability, surface modification of Nb-Al powder was carried out using the high speed impact treatment method. We got Nb-Al powder coated by Al layer with submicron thickness using surface-active agent. Mixing Al coated Nb-Al powder with organic binder was carried out. As few flaking of Al layer was observed, it was concluded that Al layer adhered to Nb-Al particle.抄録全体を表示PDF形式でダウンロード (8280K) -
Al-Si混合粉末の半溶融状態での攪拌の影響師岡 利政, 湯浅 栄二, 河村 忠治, 宮原 輝明, 吉弘 憲司1995 年 42 巻 3 号 p. 336-340
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーIn this work, influence of mechanical stirring on semi-solid state of Al-5mass%Si alloy prepared from elemental powders is examined to obtain an information about the semi-solid diecasting method using the powder. Viscosity of the slurry containing volume fraction of solid phase less than 40% is lower, but it remarkably increases when the volume fraction of the solid increased to more than 40%. In the case of low stirring speed, sizes of solid aluminum phase and eutectic silicon phase grow. The specimen solidified from the unstirred slurry has many blow holes, but they are disappeared by the stirring of low speed. As the stirring speed increased, the particle of aluminum solid in the slurry become to globular form and the grain size of silicon phase in the eutectic matrix decreases.抄録全体を表示PDF形式でダウンロード (4608K) -
島 進, 小寺 秀俊, 氏江 勇貴1995 年 42 巻 3 号 p. 341-346
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーSimulation of compaction of copper powder is carried out in three-dimensions based on a particulate modeling. Besides elastic deformation of particles, a model of plastic deformation is introduced based on micro-compression of spherical particles ; since the pressure required to achieve certain density by simulation without taking account of plastic deformation of particles is much higher than the experimentally derived one, it is concluded that it is necessary to introduce its effect. Simulations of closed-die compaction, isostatic compaction and three-dimensional compaction, where powder is capable of being compacted with arbitrary strain ratios, are performed for powders of copper particles. It is thus shown that relationship between pressures and density ratio and also constitutive behavior during compaction obtained by the simulation agree qualitatively well with experimental results. Quantitatively, however, the pressure for a particular density ratio is about a half of the experimentally derived one. The reasons are discussed and technical issues for overcoming the problems are suggested.抄録全体を表示PDF形式でダウンロード (353K) -
In-Hyung Moon, Jin-Chun Kim, Myung-Jin Suk1995 年 42 巻 3 号 p. 347-352
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーIn order that the problems encountered with a low density of MIM brown parts solve, such as lower sintered density due to a poor sinterability or shape . distortion due to the excessive shrinkage, the repressing treatment of the debound part was newly introduced as a post debinding treatment for MIM of various powders.
The various MIM green parts molded with a mixed binder system were debound by thermal debinding process. The debound parts sealed with a thin rubber mold were then isostatically pressed at the maximum pressure of the 550MPa.
The sintered density of Fe-MIM parts was improved remarkably by an additional pressing treatment of the MIM debound parts, especially for the MIM part made of the coarse Fe powders. Such an isostatic pressing treatment exerted a good effect on the shape stability of the MIM parts during sintering and also on their sintered properties.抄録全体を表示PDF形式でダウンロード (4716K) -
三浦 秀士, 野田 直, 安藤 新二, 本田 忠敏1995 年 42 巻 3 号 p. 353-356
発行日: 1995/03/15
公開日: 2009/12/04
ジャーナル フリーThe unique combinations of high toughness and high strength available with the maraging steels have made them desirable for structural applications. However, it was very difficult to produce the high performance maraging steels by conventional powder metallurgy (P/M) processes because of hard material. Metal Injection Molding (MIM) process alleviates the need for secondary working operations because of providing the net shape components, which is a suitable production route for hard materials. In this paper, the characteristics of debinding, sintering and aging behavior were studied for injection molded maraging steel compacts, and also the mechanical properties were investigated by tensile and impact test. The results are summarized as follows:
1) By using the continuous process which went on through thermal debinding and sintering at 1623K for 3.6ks in hydrogen atmosphere, the compacts were considerably densified to a relative density of 96%.
2) Aging hardness at 758K for 10.8ks reached to HRC46.5 which was as hard as the densified steels by HIP, and this aging condition was lower temperature and shorter time as compared to the condition of conventional P/M process.
3) Optimum aged MIM maraging steel showed the same strength of 1640MPa as the wrought steels, but the ductility and toughness were considerably poor.抄録全体を表示PDF形式でダウンロード (5161K) -
地主 弘幸, 京極 秀樹, 篠原 和充, 岡本 作治1995 年 42 巻 3 号 p. 357-362
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーThe effect of C addition affecting sintering behavior and mechanical properties of sintered bodies on Fe-4%Ni compacts made by injection molding has been studied. Specimens were made of carbonyl Fe(0.05mass%C, 0.2mass%O) and carbonyl Ni powder having average diameters of 5 and 2μm, respectively, and the amount of C powder added to the specimens was from 0 to 0.8g per 100g of Fe-4%Ni mixed powder. The compacts were debound in air at temperatures ranging from 503 to 553K for 7.2ks. They were then sintered in a reduced pressure of 1Pa at 1523K for 7.2ks. It was found that there exists a critical debinding temperature above which oxides precipitate in sintered bodies and below which no oxide is formed. As the amount of added C is increased, the critical temperature becomes higher. C addition strongly affects the densities and mechanical properties of sintered bodies. Below the critical temperature, for instance, C addition increases the tensile strength and it lowers the elongation.抄録全体を表示PDF形式でダウンロード (1980K) -
秋房 義則, 寒川 喜光, 金子 泰成1995 年 42 巻 3 号 p. 363-366
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーSolvent debinding of injection molded metal powder by organic solvents of N-Metylprrolidone(NMP, f.p.91.0°C) was studied. The organic binder was composed of polyplopylene, paraffin wax(Pwax), urethane wax(Uwax) and acrylic wax(Awax).The Uwax was suitable for rapid solvent debinding with NMP. NMP had excelent properties that was high flashing point, low virulent and water soluble.NMP cooled from 70°C of the solvent debinding tempurature to room tempurature after the solvent debinding was deposited Pwax and Awax.The solvent mixtures, an addition of water to the solvent, was deposited Uwax.Therefore it is possible for solvent debinding with NMP to recycle of the elemets of wax and the solvent for distillation. To weed out NMP from green body had to dry in vacuum at 100°C over 22.5 hours. Therefore the thermal debinding was given with use of the solvent debound body that was no drying Thus the solvent debound body that was extraction ratio of wax over 15% was no deformation as the thermal debinding. In spite of the fact, it was proved that NMP can be effectively used as substitute for the conventional solvent.抄録全体を表示PDF形式でダウンロード (3012K) -
三浦 立, 遠藤 保夫, 斑目 広和, 高森 清次1995 年 42 巻 3 号 p. 367-372
発行日: 1995/03/15
公開日: 2009/12/04
ジャーナル フリーIn producing complex parts by metal injection molding (MIM), various defects are encountered. Most of them can be introduced in the molding stage and they are affected by many factors such as molding condition, binder and powder used, mold design and so on. It is, at present, very difficult to predict the occurrence of the defects in advance; however, they should be completely eliminated to ensure the reliability of the products.
This paper describes the molding defect (crack) found in the thin-wall complex part. In order to eliminate this defect, the effects of molding condition, binder content, binder and powder characteristics and recycling of compound have been investigated. Holding pressure, mold temperature and molding temperature (temperature at the nozzle) have a significant effect on the formation of the defect, while the effect of injection speed is relatively small. Binder content, binder and powder characteristics and recycling of compound also have a considerable effect, and their effects can be consistently attributed to their effects on the flowability of the compound.
Based on the above mentioned results and the short-shot test result, it has been concluded that the mechanism by which the defect forms is very similar to that of weldline cracks.抄録全体を表示PDF形式でダウンロード (3527K) -
中西 勝, 馬渕 守, 久保田 耕平, 東 健司1995 年 42 巻 3 号 p. 373-377
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーRelationship between extrusion ratio and mechanical properties was examined on hot extruded machined-chip of AZ91 magnesium alloy so as to establish a technology to recycle magnesium alloys from machined chips by a simple method. High tensile strength was achieved when the machined chips were extruded at an extrusion ratio of 4.9 or more compared with a material extruded at a ratio of 1.8 or a hot pressed material because the machined chips were completely bonded to each other and microstructure such as grains and Al12Mg17 precipitates was refined by severe plastic deformation of the machined chips during hot extrusion. A material extruded at a ratio of 44 showed the highest tensile strength of 373MPa, while the strength decreased when the extrusion ratio increased up to 100 owing to recovery of the microstructure. On the other hand, fracture strain increased with increasing extrusion ratio; 7.3% or more fracture strain was achieved especially when the extrusion ratios were 44 or 100 because initiation and growth of cracks were suppressed by the refined microstructure.抄録全体を表示PDF形式でダウンロード (5056K) -
三浦 秀士, 味富 晋三, 安藤 新二, 本田 忠敏1995 年 42 巻 3 号 p. 378-382
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーHigh performance sintered 4600 steels were obtained by Metal Injection Molding (MIM) process in our previous study. This was due to the fine heterogeneous structure which were consisted of bainite, martensite and retained austenite by the segregation of Ni added as alloying element. This study has been performed to confirm whether the effect of heterogeneous structure upon the steel strengthening in other steels. With respect to the mechanical properties, not only static tensile test but also dynamic impact test were performed by using prealloyed and elemental 4100 powders.
For both specimens of prealloyed and elemental powders, the final carbon content was widely controlled by adjusting the debinding atmosphere, and the similar densities were also obtained by adjusting the sintering conditions. Sintered microstructures of prealloyed powder specimens were dual homogeneous structures consisted of ferrite and fine pearlite. On the other hand, heterogeneous structure of bainite and martensite appeared in the elemental powder specimens. Both sintered specimens showed almost the same ductility and toughness, but the strength of elemental powder specimens were higher than that of prealloyed powder specimens because of the heterogeneous structure with high strength bainite and martensite. However, the difference of strength between the both powder specimens were diminished with an increase in tempering temperature through the homogenization in the structures.抄録全体を表示PDF形式でダウンロード (4995K) -
草加 勝司, 河野 富夫, 近藤 鉄也, 洞田 亮1995 年 42 巻 3 号 p. 383-387
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーThe objective of this work is to elucidate the tensile behavior of sintered Ti compacts made from gas-atomized and HDH powders by Metal Injection Moulding (MIM) Process.
The results obtained were summarized as follows:
(1) Tensile strength increases almost proportionally to the amount of HDH powder in gas-atomized powder, relating strongly to oxygen content in sintered Ti.
(2) Tensile elongation is 20% constantly upto 50% (oxygen content 0.3%) of HDH powder to gas-atomized powder and then, rapidly decreases for more than 50%.
(3) Sintered Ti has better tensile strength (640MPa) and elongation (21%) in equal amount of HDH and gas-atomized powders, well compared to JIS 3 grade of wrought Ti.抄録全体を表示PDF形式でダウンロード (3107K) -
落合 鍾一, 井上 嘉, 小久保 公二1995 年 42 巻 3 号 p. 391-396
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーTiC added (TiAl+Ti3Al) aluminide composites with 0, 5, 10, 15 and 20 vol%TiC were produced by powder metallurgical method using Ti-42mol%Al prealloyed matrix powder and TiC powder. Those blends were sintered by HIP method. Microstructures, mechanical properties and oxidation resistance of obtained compacts were investigated. The matrices of compacts were found to be consisting of TiAl and Ti3Al phases regardless of whether TiC was added. Both lamellar structures within grains whose sizes were estimated at less than 100μm and equiaxed grain structures were observed for matrix. On the other hand, the formation of Ti2A1C phase for TiC added alloys was confirmed. The flow stress was increased with increase of TiC volume, which contrasted with the decrease of fracture stress and fracture strain. Measured mass gain of no less than 300 g/m2 for any specimens at 1223 K for 86.4ks suggested that addition of TiC has little effect on improving the oxidation resistance.抄録全体を表示PDF形式でダウンロード (3358K) -
福田 和也, 佐藤 隆之, 橋本 康宏, 砂田 久吉, 深浦 健三1995 年 42 巻 3 号 p. 397-401
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーTitanium oxide whisker reinforced aluminum matrix composites were fabricated by a powder metallurgical method. Our previous study on tensile properties of TiO2(N)/A1 composite indicated that the interfacial reaction occured considerably on the fabrication process, however, their tensile properties were nearly equal with those of SiC(W)/ Al composite.
In this study, fatigue strength was examined by rotating bending test, and the whisker /matrix interface structure was investigated by scanning electron microscope and X-ray diffraction method. For the TiO2(w)/A1 composite, TiO2 whisker changed to Ti2O3 after hot pressing and A1, Ti and A12O3 were produced after hot extrusion at the interfaces. Fatigue limit for the TiO2(R)/A1 composite increased about 50% compared with that of monolithic aluminum. Fatigue crack growth direction was diflected by the whisker and propagated in the matrix along the interface. This fact means that the resistance to crack initiation and propagation increased because the adhesion force between whisker and matrix was improved by the existence of reactants at the interface.抄録全体を表示PDF形式でダウンロード (6560K) -
富田 正一1995 年 42 巻 3 号 p. 402-407
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーControl of carbon content in sintering process was studied in order to get the efficiency and the utility in the the metal injection molding process of structural alloy steel.After debinding the injection molded bodies of chromium molybdenum steel(SCM440) powder, the carbon content of the specimens was controlled by flowing hydrogen or hydrogenmethane mixture in the sintering process where the flow rate of gasses was regulated by mass flow and program controllers.As a result, the carbon content of the sintered bodies was almost proportional to the ratio of methane to hydrogen gas in the carburization at 1000°C, and the carbon distribution in the sintered bodies could be also controlled by adequate selection of conditions(time, flowing rate etc.)of flowing methane.抄録全体を表示PDF形式でダウンロード (7350K) -
機械的性質の検討森下 政夫, 田中 謙太郎, 香山 滉一郎1995 年 42 巻 3 号 p. 408-412
発行日: 1995/03/15
公開日: 2009/05/22
ジャーナル フリーNickel was added to improve the ductility of a new reaction sintered Al-Ti-N alloy which consists of A13Ti and A1N.phases. The added Ni transformed the crystal structure of A13Ti from DO22 to a, high symmetry Li2, and as a result, improved'the bending strength and ductility at the room temperature. Furthermore, it was found that the hardness of the alloy with L12-A13Ti as a constituent increased with an increase in temperature up to about 700K wherease the hardness of the alloy with DO22-A13Ti as a constituent decreased with an increase in temperature. Thus, this alloy is expected to be a hopeful material.抄録全体を表示PDF形式でダウンロード (1721K)
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