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Volume 15, Issue 5
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[in Japanese]1968 Volume 15 Issue 5 Pages 211-226
Published: August 25, 1968
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (14762K) -
Tadaaki Sugita, Mitsuhiko Furukawa, Heiji Yasui1968 Volume 15 Issue 5 Pages 227-232
Published: August 25, 1968
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe friction and wear behaviors of ceramics and cemented carbide have been studied. The coefficient of friction and wear are greatly influenced by the sliding velocity and the load during sliding. Adhesive films are affected by the frictional conditions, and the friction and wear behavior depend on the adhesive films.
The coefficient of friction and wear are low when a uniform and stable adhesive film is formed at moderate load levels (2-3kg), consequently, ceramics and cemented carbide cann slide effectively. However, the coefficient of friction is high when the films are. difficult to be made at low load level (1 kg), and they are broken at high load level (4 kg).
The wear rate of cemented carbide is proportional to the sliding velocity and load, but the wear rate of ceramics is mainly governed by the load.View full abstractDownload PDF (1613K) -
Tadaaki Sugita, Mitsuhiko Furukawa, Heiji Yasui1968 Volume 15 Issue 5 Pages 233-239
Published: August 25, 1968
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe friction and wear behaviors of ceramics and cemented carbide are greatly influenced by the presence of adhesive or oxide films which are formed during sliding. Increase in sliding velocity causes an increase in temperature, and increase in load has a tendency to remove surface lubricating films (adhesive films). For example, at the load of 4kg, the adhesive films are suddenly broken, the surface damage and fragmentation are observed. It is evident that brittle materials become much more ductile during sliding. The sliding process also destroys the original crystal structure at the surface, and the generated adhesive films are driven into the bulk of the material.View full abstractDownload PDF (7513K) -
Hidehiko Kuwamoto, Shunjiro Saito, Takeshi Takei1968 Volume 15 Issue 5 Pages 240-244
Published: August 25, 1968
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSZinc ferrite was synthesized hydrothermally from acicular goethite and zinc oxide, powder. pH of the solution was found to have a remarkable effect upon the size of ferrite formed. The grain growth of the nucleus was promoted by the addition of the ferrite powder as nucleus in the formation. A short discussion was given on these phenomena.View full abstractDownload PDF (2895K) -
Moriya Oyane, Yoshichika Taketsuna, Nobuyoshi Nishihara1968 Volume 15 Issue 5 Pages 245-253
Published: August 25, 1968
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSCopper and iron powders were compacted in a closed die or extruded against back pressure at high or low speed, and the effect of the forming speed on the properties of powder products was discussed.
Copper powder compacts obtained at high speed (-11m/sec) had lower density and more uniform hardness distribution than those compacted at low speed.
Copper and iron pre-sintered compacts could be extruded without cracks through high speed extrusion against back pressure higher. than 1400kg/cm2 and 3000kg/cm2, respectively, while both of them cracked in low speed extrusion.
The density and strength of products increased and the hardness variation on the transverse sections decreased with increasing back pressure.View full abstractDownload PDF (4204K)
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