巻号一覧
30 巻, 3 号
選択された号の論文の6件中1～6を表示しています
- |<
- <
- 1
- >
- >|
-
高城 重彰, A. Kaysser Wolfgang, Petzow Günter1983 年 30 巻 3 号 p. 83-86
発行日: 1983/04/25
公開日: 2009/12/04
ジャーナル フリーThe mechanism of particle coalescence during liquid phase sintering of Fe-Cu can be described as the contact formation between adjacent particles with a low energy grain boundary and the subsequent neck growth. By means of electron channeling pattern investigations on an analogous system Cu-Ag, such low energy grain boundaries are characterized by orientation relations corresponding to the coincidence-site relations. The particle growth behavior predicted by the coalescence principle agrees well with the experimental observations on Fe-Cu, suggesting a large contribution of coalescence to the particle growth.抄録全体を表示PDF形式でダウンロード (2655K) -
真島 一彦, 祖浜 嘉男1983 年 30 巻 3 号 p. 87-93
発行日: 1983/04/25
公開日: 2009/12/04
ジャーナル フリーIn this experiment, the effects of hydrostatic compression and Cu addition on the densification of Ti-50atooNi binary mixed powder compacts were examined by a dilatometric method, and the diffusion process between Ti and Ni powders was investigated by EPMA. The results obtained were as follows:
1) The abnormal expansion observed during heating process for the uniaxially compressed Ti-50at%Ni specimen, was considerably eliminated by the use of hydrostatic compression, where the theoretical density ratio (Ds/Dt×100%) was confirmed to be 82% for the heating rate of 10°C/min, and 85% for that of 5°C/min.
2) The phenomenon eliminating the abnormal expansion, which has been observed similarly in the above mentioned hydrostatic compressed specimen, was also recognized in the sintering process for Ti-(50-x)Ni-xCu ternary system, where the most effective amount of Cu addition was determined to be 2at%. It was confirmed that Cu is well homogenized in the Ti-48Ni-2Cu specimen sintered at 1050°C for 4h.抄録全体を表示PDF形式でダウンロード (4140K) -
特にMoS2粒子周囲のバインダ相の効果について河野 通, 西野 良夫1983 年 30 巻 3 号 p. 94-98
発行日: 1983/04/25
公開日: 2009/12/04
ジャーナル フリーMeasurements of the friction coefficient at the start-up and intermittent running tests at the room temperature (P=3 kg/cm2, N=24, 000rpm, PV= 1800 kg/cm2.m/min) were carried out for the sintered Cu-9/%Sn-0.4%P-3%%MoS2-0.5%C bearing (B061) for high speed revolution application trial-manufactured by the authors, in which Cu-P-Mo-S compounds (binder phase) are formed around the MoS2 particles, and compared with those obtained for the phosphorus-free bearing added only MoS2 to Cu-Sn base, Cu-9%Sn-3%MoS2 bearing (S60), and also for conventional Cu-9%Sn bearing (B 110).
Under the elevated temperature circumstances (80°C), continuous and intermittent running tests (P=3 kg/cm2, N=32, 000 rpm, PV=2400 kg/cm2-m/min) were also carried out for general evaluation of the trial-manufactured bearing as high speed revolution applications.
The results obtained were as follows;
1) With regard to the friction coefficient at the start-up, the value of S60 bearing was the lowest and the value of B061 bearing was slightly lower than that of B110 bearing. In the high speed intermittent running tests at the room temperature, however, B061 bearing revealed an excellent performance in comparison with S60 bearing.
2) In the continuous and intermittent running tests at the elevated temperature, in comparison with BI 10 bearing B061 bearing was superior in all items measured namely, the friction coefficients at the start-up and the regular state, the bearing temperature at the regular state, the rate of dissipation of lubricant oil, and the amount of wear of the bearings after the running tests.抄録全体を表示PDF形式でダウンロード (3137K) -
本田 忠敏1983 年 30 巻 3 号 p. 99-105
発行日: 1983/04/25
公開日: 2009/12/04
ジャーナル フリーThe purpose of the present work is to clarify the relationship between the internal and external notch factors which are concerned with the infiltrating time and ratio, non-metallic inclusions and the matrix hardness, and the fatigue strength of Cu-infiltrated sintered iron compacts.
The results obtained were as follows:
(1) When pores of iron skeleton were infiltrated with copper or silver, the calculated internal notch factors of infiltrated specimens reduced remarkably. Both their internal and external notch factors increased gradually with increasing the formation of Fe-Cu alloy phase during infiltrating.
(2) The calculated internal notch factors of Cu-infiltrated specimens increased, while the external notch factors of them decreased reversely with decreasing the infiltrating ratio.
(3) When the iron skeleton containing essentially some non-metallic inclusions was infiltrated with copper, both its internal and external notch factors increased.
(4) The calculated internal notch factors of Cu-infiltrated specimens increased greatly by age-hardening, but their external notches after age-hardening affected only slightly their fatigue strengths. This might be reasoned that the sensitivity for the internal notch of them increased with increasing the matrix hardness due to age-hardening.抄録全体を表示PDF形式でダウンロード (3279K) -
鈴木 寿, 林 宏爾, 松原 秀彰, 徳本 啓1983 年 30 巻 3 号 p. 106-111
発行日: 1983/04/25
公開日: 2009/05/22
ジャーナル フリーThe strength and deformation characteristics of nitrogen contained TiC-Mo2C-Ni alloys were mainly studied at 1273K. The TiC-Mo2C-Ni, TiC0.7N0.3-Mo2C-Ni and TiC0.5N0.5-Mo2C-Ni alloys with different carbon and Mo2C contents were used as specimens.
In usual bending tests, the deformation was suppressed and transverse-rupture strength increased with increasing nitrogen, carbon and Mo2C contents of the alloy. In creep bending tests, the suppression of deformation and an increase in creep strength were observed with increasing nitrogen and Mo2C contents of the alloy. The improvement of T.R.S. and creep strength was markedly observed, in particular, in the alloys containing nitrogen, and clearly related to the decreased grain size of carbonitride and the increased molybdenum content in binder it was phase, respectively.抄録全体を表示PDF形式でダウンロード (1599K) -
永井 宏, 藤川 武志, 庄司 啓一郎1983 年 30 巻 3 号 p. 112-117
発行日: 1983/04/25
公開日: 2009/12/04
ジャーナル フリーThe isothermal oxidation behavior of sintered Ni-20Cr alloys with various amounts of La2O3 and Y2O3 dispersion was investigated in air at 1373 and 1473 K.
Dispersion of La2O3 more than 0.2 massj significantly reduced the oxidation rate of sintered Ni-20Cr alloy. Dispersion of Y2O3 more than 1.0 and 0.4 mass% increased the oxidation rate at 1373 and 1473 K, respectively. Very thin Cr2O3 scale was maintained stably for the alloys with La2O3 dispersion, while NiO and NiCr2O4 scales formed over the inner Cr2O3 scale for the alloys with and without Y2O3 dispersion. The spalling of the scale was strongly suppressed by the dispersion of La2O3. The dispersion of Y2O3 also suppressed the spalling of the scale, but the effect of Y2O3 dispersion was far smaller than that of La2O3 dispersion.
Electrical resistivity of sintered Cr2O3 with 1 mass% of La2O3, Y2O3, Fe2O3 and NiO was measured in the temperature range from 773 to 1473 K. The addition of La2O3 and Y2O3 decreased the electrical resistivity of Cr2O3, but the decreasing rate was larger in the case of La2O3 addition than Y2O3 addition. The Fe2O3 addition slightly decreased the electrical resistivity, while the NiO addition significantly changed the electrical resistivity and its temperature dependence.
The results obtained in this study suggested that the effect of the dispersoid on the oxidation behavior might be related to the altering the defect structure of the scale.抄録全体を表示PDF形式でダウンロード (3951K)
- |<
- <
- 1
- >
- >|