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Volume 24 (1986)
- Issue 6 Pages 290-
- Issue 5 Pages 228-
- Issue 4 Pages 164-
- Issue 3 Pages 106-
- Issue 2 Pages 55-
- Issue 1 Pages 3-
Predecessor
Volume 24, Issue 6
Displaying 1-8 of 8 articles from this issue
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Carbide Formation of the Tantalum Barrier FoilSatoru HOSOMI, Akiko TAGUCHI1986 Volume 24 Issue 6 Pages 290-299
Published: November 25, 1986
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSComposites (for tool blank application) of WC-Co support, tantalum intermediate layer, as a barrier, and sintered diamond were prepared by a simultaneous sintering technique under a high pressure-temperature condition. Tantalum carbide specimens were also prepared from a starting material of TaC powder by treating under identical conditions. The observed microstructures and chemical compositions of the composites are discussed in comparison with that of the specimens. Regarding the principal formation process of the tantalum carbide region observed in the tantalum layer of the composites, it may be suggested that tantalum reacts with cobalt melt to yield an alloy of Ta and Co, which subsequently is converted to tantalum carbide and cobalt.View full abstractDownload PDF (9710K) -
Keijiro SHIMIZU, Ryuji MARUYAMA1986 Volume 24 Issue 6 Pages 300-304
Published: November 25, 1986
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSIn order to estimate the thermal stress of bolts, a three dimensional transient temperature distribution and thermal stress analysis based on the finite element method is applied.
The numerical results are compared to experimental observations. Good agreements are obtained.View full abstractDownload PDF (424K) -
Kouzou KANAYAMA, Mamoru NAKAMURA1986 Volume 24 Issue 6 Pages 305-312
Published: November 25, 1986
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA high pressure apparatus, which consisted of a bucket and outer case in contact to each other with a tapered surface, was developed. During high pressure generation, control of the supporting pressure on the core was possible by adjustment of the bucket stroke into the outer case. Strengthening characteristics of this apparatus were examined using a steel core with wire resistance strain gages. The results obtained, which gave instructions for operation and design for this apparatus, are as follows; 1) Owing to the sliding friction force, the relation between the supporting force and the stroke of the bucket showed hysteresis. 2) Strains at the inner surface of the core had the maximum value at an early stage of decreasing process of the supporting force. 3) The core and the bucket were deformed into the hand drum shape by applying the supporting force. Circumferential and axial strains were negative and positive, respectively. 4) Both of the taper angle and the ratio of the inner diameter to the outer diameter of the bucket influenced on distribution of the contact pressure between the outer case and the bucket.View full abstractDownload PDF (875K) -
Toshiaki MURAKAMI, Hiromitsu YOGUCHI, Motoji TSUBOTA, Hideo KASHIWAYA1986 Volume 24 Issue 6 Pages 314-321
Published: November 25, 1986
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSExplosive bonded cylinders consisting of three-layer-rings (φ800mm-L1000mm) of A286 (inner and outer rings) and Cu-Cr (damper ring) for the superconducting turbine generator were investigated.
Because of the requirement of high strength (σy=70kgf/mm2), heavy thickness (20-30mm) and multi-layers bonding, some fundamental tests were performed using the same material and thickness plates for actual structure and three-layer-rings with carbon steel and copper.
Using the knowledge from above investigations, A286/Cu-Cr/ A286 explosive bonded cylinder was manufactured and (1) diametrical change after bonding, (2) mechanical properties of A286 and Cu-Cr, (3) bonding strength and (4) fatigue strength under the severe service conditions at the event of generator short circuit were studied.
The obtained results were as follows.
(1) The diametrical changes in radial and longitudinal direction were-3.0% and 2.0% respectively.
(2) The difference of 0.2% proof stress in tangential and longitudinal direction caused by plastic strain at the bonding was remarkable.
(3) The bonding strength at two boundaries (inner-damper rings and outer-damper rings) was good enough compared with damper strength.
(4) Crushing force at the event of generator short circuit caused no separation and cracking in this structure.View full abstractDownload PDF (5582K) -
Takashi MORIYOSHI, Yasuhiro UOSAKI1986 Volume 24 Issue 6 Pages 322-331
Published: November 25, 1986
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSIn recent years, supercritical fluids have received much attention in the field of separation techniques such as extraction, oil recovery, chromatography, etc. The essential features of the fluids which favor their use in the applications are: firstly their densities depend strongly on pressure and temperature near the critical point and secondly their transport properties (i. e. low viscosity and moderate mass diffusivity) are more favorable for mass transfer than those of liquids.
In this review, we will briefly describe some physical properties of supercritical fluids and the current situation of the technical applications. The description is further given for the principal types of phase behavior and the theoretical considerations of phase equilibria associated with supercritical fluid extraction.View full abstractDownload PDF (1118K) -
[in Japanese]1986 Volume 24 Issue 6 Pages 332-340
Published: November 25, 1986
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSDownload PDF (1254K) -
[in Japanese]1986 Volume 24 Issue 6 Pages 341-343
Published: November 25, 1986
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSDownload PDF (332K) -
[in Japanese]1986 Volume 24 Issue 6 Pages 344-346
Published: November 25, 1986
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSDownload PDF (2080K)
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