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Volume 15 (1965)
- Issue 6 Pages 333-
- Issue 5 Pages 273-
- Issue 4 Pages 201-
- Issue 3 Pages 139-
- Issue 2 Pages 83-
- Issue 1 Pages 1-
Volume 15, Issue 2
Displaying 1-6 of 6 articles from this issue
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Takakado NAKAYAMA1965 Volume 15 Issue 2 Pages 83-84
Published: March 31, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (389K) -
Yoshikazu HORIGUCHI, Shunzo KATAYAMA1965 Volume 15 Issue 2 Pages 85-91
Published: March 31, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSCarbonation experiments were carried out on an aqueous suspension containing red mud, a by-product of Al2O3 manufacture by the Bayer process.
(1) In the course of carbonation, the components of the red mud cease practically from dissolution after about 120min.
(2) The quantities of Na, Si, Ca and Mg dissolved by carbonation, which give the highest value at 10°C, decrease with rising the temperature at which the carbonation is made, respectively.
(3) With increase in the concentration of CO2 gas, they increase, on the contrary, the quantity of Fe dissolved by carbonation decrease.
(4) With increasing a ratio of red mud to H2O, the quantities of Na, Ca, Mg and Fe dissolved by carbonation increase, however, that of Si attains the maximum at the ratio of 1 to 20.
(5) The course of carbonation depends upon the variety of red mud to be leached.
(6) It is found from the rate of dissolution of Na amounting to 33% at maximum that a partial decomposition of the sodium aluminosilicate in the red mud may be taken place during carbonation. Generally, the quantities of Si, Ca, Mg and Fe dissolved by carbonation are small.
(7) From the results obtained, some discussions are made for the chemical reactions during the carbonation and an optimum condition is determined to recover Na as NaHCO3 solution from red mud.View full abstractDownload PDF (779K) -
mechanical properties of welded Al-Zn-Mg alloysIkuro TANI, Yutaka ISHIKAWA1965 Volume 15 Issue 2 Pages 92-103
Published: March 31, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThis report describes changes of mechanical properties of welded Al-Zn-Mg alloys. 1) Effects of varied Zn, Mg, Mn, Cr and Ti content in parent alloys on tensile properties of welds made by TIG process with 5356, AlMg7, 4043 and AlSi8 filler alloys, 2) effects of filler alloys, 3) effects of thickness of parent plate and edge preparation on tensile properties of welds made in Al-5%Zn-1%Mg-0.2%Mn alloys, 4) aging and fatigue characteristics of welds made in the aforesaid alloys, 5) comparison of tensile properties between welds made in Al-5% Zn-1%Mg and Al-5%Zn-2%Mg alloys are investigated, and the following conclusions are obtained.
1) Tensile and yield strengths of welds slightly increase with Zn content in parent alloys, but joint efficiencies decrease with Zn content.
2) Tensile and yield strengths of welds increase with Mg content in parent alloys, however, joint efficiencies are constant and do not change with Mg content.
3) Joint efficiencies of tensile properties of welds slightly decrease with Mn and Cr content in parent alloys, however, increase with Ti content in parent alloys. And accordingly addition of Ti improves joint efficiencies formerly reduced by Mn and Cr content.
4) Joint efficiencies of welds decrease in order of 5356, AlMg7, 4043, and AlSi8 filler alloys, and 5356 filler alloy is of the optimum quality.
5) The mechanical properties of welds in Al-5%Zn-1%Mg alloy are concluded to be good.
6) To obtain stronger welds it will be suitable to use Al-5%Zn-2%Mg alloy for parent alloy and Al-4% Mg-2%Zn alloy for filler alloy.
7) Low tensile properties, especially low elongation value, of welded Al-Zn-Mg alloys are explained by micro-cracks originating from casting-crack characteristics of parent alloy composition and effect of gas during welding.View full abstractDownload PDF (1960K) -
Yoshiyasu ITO, Keitaro YAMAMOTO, Yoshimasa TOMINAGA1965 Volume 15 Issue 2 Pages 104-118
Published: March 31, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe occurrence of microshrinkage defects are often found on large size pistons when they are cast in AC8A alluminum alloy, besides, the removal of those defects are considered very difficult.
Through the inspection and the test of such pistons on which those microshrinkage defects exist, we found that the fatigue strength of the pistons at room temperature is approximately 7-9kg/mm2.
Aiming at the removal of such casting defects, we have improved the casting methods as follows:
(1) To secure sufficient degasification, we apply both Cl2 gas blowing method and remelting method in the casting process.
(2) To secure steady and yet fast pouring, we improved the runner.
Namely we built a lucite replica in the same shape as the piston mould, and poured water through it to obserbe the water flow, so that we could improve the runner to meet our aim satisfactorily.
(3) In order to obtain better solidification rate, we apply the water cooling to pistonpin-core, bottom mould and outside mould.
After applying the above-mentioned modifications, we cast AC8A alluminum alloy pistons and carried out the defects inspection and the fatigue test.
As a result, it was made clear that the casting defects in piston-crown, ring-groove, and piston-pin-boss were almost completely removed, and the fatigue strength in these parts are marked as 12-13kg/mm2 at room temperature and 4.3kg/mm2 at 300°C.View full abstractDownload PDF (3755K) -
The examination of suspention in electrophoresis for aluminium electrodepositionToshio YAMADA, Mitsuo ABE, Kazuko KITABATAKE1965 Volume 15 Issue 2 Pages 119-125
Published: March 31, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSVarious methods to coat steel plate with aluminium have been put to practical use.
Now, in this experiment, fine aluminum powder was electrodeposited on steel plate by electrophoresis, alcohol with water was used as suspention.
The conditions under which alcohol with water are able to obtain good electrodeposited faces at low voltage were examined. The results obtained are summarized as follows:
(1) In case where the only alcohol or alcohol with water was used as suspention, electrodeposition was successful to 20% water.
(2) In case of using the only alcohol or alcohol with water as suspention, when the quantity of AlCl3 was 5-10m-mol/l the electrodeposition was best. In case of using the only alcohol as suspention, when the quantity of AlCl3 5-7m-mol/l the result was best.
In the case where the alcohol with water was used, when the quantity of AlCl3 was 7-10m-mol/l the result was best.
(3) In case where the suspention was alcohol only, tannic acid did not so much affect the quantity of electrodeposition.
In case where the alcohol with water was used as suspention, when the quantity of tannic acid was 0.25g/l the amount of deposition was largest.
(4) When 10W/V% aluminum powder was used in the suspention, in case either the only alcohol or the alcohol with water was used, a good result was obtained.
(5) With 0.20A/dm2 current density, good electrodeposition was obtained.
(6) The electrodeposition quantity was proportioned to time of migration up to 12min.View full abstractDownload PDF (1261K) -
The effects of the various conditions on electrodeposition of aluminium by electrophoresisToshio YAMADA, Hidemi KIMATA, Katsuhisa SUGIMOTO1965 Volume 15 Issue 2 Pages 126-133
Published: March 31, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIn this experiment, the authors made the standard of suspension by both flaky and atomized Al-powder, then examined the effects of the several factors on the electrodeposition i.e. bath voltage, depositing time, bath temperature, agitation and grain sizes and observed the state of the deposited zone.
The results obtained are as follows:
1. The fittest conditions of electrodeposition are shown in the following table.
2. When the time is constant, the deposition rate of flaky powder is larger than that of atomized powder in low voltage, but in high voltage, the deposition rate of atomized powder becomes larger than flaky. Moreover the depositing rate is not generally proportional to voltage.
3. The deposition rate varies with the length of time. Under a constant voltage, the shorter the deposition time is, the larger the deposition rate becomes, then the better the deposition efficiency.
4. The density of the deposited zone of atomized powder is larger than that of flaky powder. Moreover, the density of the deposited zone is equal to the apparent specific gravity of each powder.
5. The thickness of the deposited zone increases as the bath voltage and the deposition time increase, and the deposited zone of flaky powder is thicker than that of atomized powder.
6. The deposition rates of both aluminium powders are effected strongly by agitation and a maximum point of rate is observed. The limit of rotation number of the screw is shown.
7. In the case of the flaky powder, it was observed that the finer grains preferentially deposit. And in the case of the atomized powder, the amount of deposit of +210 mesh powder was only less than 15% of that of -325 mesh powder.
8. The state of the surface of the deposited zone was effected by bath voltage, time, temperature and agitation, and the surface became rough on account of gas produced under high voltage, long time, high temperature etc.
9. In the deposition of flaky powder, each grains deposit in pararell with the surface of electrode steel plate under low voltage or short deposition time, but under high voltage or long deposition time, each grains arrange irregularly. In the deposition of atomized powder, the direction of deposit as above mentioned was not able to be observed.View full abstractDownload PDF (1929K)
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