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Volume 21, Issue 8
Displaying 1-5 of 5 articles from this issue
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[in Japanese]1975 Volume 21 Issue 8 Pages 213-221
Published: January 25, 1975
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (744K) -
Hisashi Suzuki, Kozi Hayashi, Tsutomu Yamamoto, Kazuo Miyake1975 Volume 21 Issue 8 Pages 222-226
Published: January 25, 1975
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSAs previously reported by the present authors, studies on the strengthening mechanism of hot-isostatically pressed cemented carbides (H.I.P. alloy) had been carried out. In this paper, some properties such as specific gravity, lattice parameter of the binder phase (γ phase), micropores developed, and those Properties affected by vacuumannealing or resintering were investigated in H.I.P. alloy, the results being compared with those of normally-sintered cemented carbides (N.S. alloy).
Results obtained were as follows:1) Specific gravity and lattice parameter in H.I.P. alloy were generally observed to be a little lower and higher, respectively, than those of N.S. alloy, and these properties easily changed towards the values of N. S. alloy by annealing or resintering. 2) Micropores having the diameter less than about 1.5 μφ were observed in H.I.P. alloy, and the numbers were increased by annealing. The transverse-rupture strength, however, was not affected by this increasing numbers. 3)The above mentioned properties of H.I.P. alloy could qualitatively be explained as being caused by the argon gas dissolved in the γ phase of H.I.P. alloy.View full abstractDownload PDF (3247K) -
Yoshikazu Yamamichi, Tomomichi Kudo, Minoru Nakayama, Makoto Orii1975 Volume 21 Issue 8 Pages 227-232
Published: January 25, 1975
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSA cement copper was obtained by scrap cementation from the scrubbing solution of chloridizing volatilization process for pyrite cinder.
This cement copper was purified by rejecting the coarse portion of +325 mesh and the finer portion of -6μ by hydrocyclone and then reduced. with cracked ammonia gas reducing furnace at the temperature of 700-800°C, finally being converted into copper powder for the powder metallurgical use. This copper powder was compared with the usual electrolytic copper powder by making an iron base sintered product, and the same quality was verified.View full abstractDownload PDF (1468K) -
Makoto Kinoshita, Ryozo Hayami1975 Volume 21 Issue 8 Pages 233-247
Published: January 25, 1975
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSHot-pressing technique has become common in the laboratories and even in the production lines. In this paper, basic studies on hotpressing, and some properties and applications of hot-pressed oxides are briefly described. A list of the papers and the literatures on hot-pressing and related subjects, though not completed, is provided for the convenience of referring specific subjects.View full abstractDownload PDF (3126K) -
Hiroshi Ttô, Yasuo Mihashi, Kôji Taguchi1975 Volume 21 Issue 8 Pages 248-251
Published: January 25, 1975
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSTitanium-molybdenum alloy has the high corrosion resistance in non-oxidizing acid solutions. However, this alloy is not commercialized by the ordinary melting methods, because of the segregation and the difficulty in working.
In order to improve these points, a powder metallurgical method on titanium-molybdenum alloys was studied.
The results obtained were as follows;
1) The uniform β-Ti-Mo solid solution was obatined by the powder metallurgical method.
2) The Ti-30Mo sintered compacts have the markedly high corrosion resistance on non-oxidizing acid solutions (HCl, H2SO4).
3) The mechanical properties of sintered compacts obtained in this experiment were not yet satisfied.
4) The Ti-Mo compacts made of sodium reduced titanium powders were found to have better mechanical properties than these made of other titanium powders.View full abstractDownload PDF (1340K)
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