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Volume 12 (1965)
- Issue 6 Pages 219-
- Issue 5 Pages 183-
- Issue 4 Pages 139-
- Issue 3 Pages 93-
- Issue 2 Pages 55-
- Issue 1 Pages 7-
Volume 12, Issue 3
Displaying 1-4 of 4 articles from this issue
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[in Japanese]1965 Volume 12 Issue 3 Pages 93-101
Published: June 25, 1965
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (601K) -
Eizo Takama1965 Volume 12 Issue 3 Pages 102-107
Published: June 25, 1965
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSTo obtain ferrites which show rectangular hysteresis loops, MnO-ZnO-Fe2O3 ternary ferrites were sintered by the two step sintering process, wherein the first step sintering is performed under a reduced atmosphere and the second step sintering is done under an equilibrium atmosphere.
Sintering process of the two step sintering was also studied.
The results are as follows :
1) Mn-Zn-Fe ferrites having rectangular hysteresis loops are obtained when the composition is such that λ 111 is small, and K 1 is adequately large.
2) B r/B 5=0.94, B r=3, 890 Gauss, H c=0.37 Oe, T c=280°C and density=4.92 g/cc at the composition of 51 MnO-49Fe2O3.
3) When ferrites are sintered under a reduced atmosphere, a considerable ferrite formation occurs at 1, 000°C, and a remarkable shrinkage proceeds over the temperature range between 1, 000°C and 1, 200°C.View full abstractDownload PDF (1532K) -
Sintering Characteristics of W-NiP AlloysHiroshi Ito, Mitsuhiko Furukawa1965 Volume 12 Issue 3 Pages 108-115
Published: June 25, 1965
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe activated sintering of tungsten with Ni or other group VIII elements had been studied by J. H. Brophy and many other investigators. We tried the activated sintering of tungsten with Ni-P alloy by means of the electroless Ni plating on purpose to obtain effective results.
In this experiment, we obtained tungsten compact of a density 18.5g/cm3 by sintering at 1, 000°C for 30 minutes.
The sample used was 0.5μ W powder, with 0.19wt% Ni-P alloy.
It was difficult to obtain the tungsten compact of a higher density than 18.5g/cm3, as the tungsten particle size was larger than 1.5μ. Studies on the shrinkage, density, hardness and microstructure, as well as the chemical analysis and X-ray analysis were made in order to the mechanism of the process.View full abstractDownload PDF (4821K) -
Kimio Kawakita, Akinobu Otsuka, Yuhbun Tsutsumi, Kazumi Danjo, Yoshio ...1965 Volume 12 Issue 3 Pages 116-122
Published: June 25, 1965
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe compression of spherical glass powders has been studied by static method in the pressure range 0-7.5 tons per cm2 (Fig.1). The results obtained are as follows.
(1) During the compression process, the following distinct steps are observed (Photo. 1, 2) : (a) Packing without crushing (Initial stage of Fig. 2, 5, 6). (b) Sudden breakage of the particles and rapid diminution of apparent specific volume (Fig. 2, 5, 6). (c) Compaction of the crushed particles (Fig. 2, 3, 4, 5, 6, 11).
(2) In the process of the compression of spherical glass powder, the relation between P, the applied pressure, and n, the porosity, is generally given by the following equation (Fig. 5, Table 1) :
-(dn/dP)=k·nx
where k and x are constants.
(3) The effect of particle size on the breakage phenomena has been studied (Fig. 6, 7, 8). (a) The breakage pressure is higher for small particles than for large ones (Fig. 8, 9). (b) The degree of rapid volume change accompanying the sudden breakage increases with increasing of the particle diameter (Fig.10).
(4) In the experiments of binary mixture which composed of two different particle sizes with different ratio of mixing, it has been observed that the rapid volume change accompanying the breakage of large particles occurs when the component of large particles is above about 70 percent by weight (Fig. 12, 13, 14).View full abstractDownload PDF (2492K)
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