Agency of Industrial Science and Technology

Oiles Industry Co., Ltd.

Director-general of the Agency of Industrial Science and Technology

Tsuyoshi Hagio

Kazuo Kobayashi

Ichitaro Ogawa

Hisayoshi Yoshida

Kenji Miyazaki

Wataru Abe

Kazutsugu Kashima

Takashi Tada

Hidetoshi Ueno

Shigeru Akiyama

Yoichiro Hayashi

Takayoshi Yamamoto

Youichirou Hayashi

Disclosed herein is a high temperature-resistant and abrasion-resistant sliding member of graphite-metal borides showing a friction coefficient of 0.01 to 0.09 and a specific amount of abrasion of 1.0 to 4.0.times.10.sup.-8 mm.sup.2 /kg under the measuring conditions of a load of 20 kg/cm.sup.2 and a sliding velocity of 5 m/min at an atmosphere temperature of 300.degree. C., a bending strength of 230 to 900 kg.f/cm.sup.2 and a Shore hardness of 28 to 45, produced by sintering (a) 70 to 93% by weight of amorphous carbon powder, (b) 5 to 20% by weight of at least one boride of a metal of IVa group, Va group of VIa group of the periodic table and (c) 2 to 10% by weight of powdery natural graphite, powdery Kish graphite or a mixture thereof.

Sliding member of graphite-metal borides

Disclosed herein is a high temperature-resistant and abrasion-resistant sliding member of graphite-boron carbides showing the friction coefficient of 0.01 to 0.13 and the specific abrasion amount of 10.sup.-7 to 10.sup.-9 mm.sup.2 /kg under the measuring conditions of the load of 20 kg/cm.sup.2 and the sliding velocity of 5 m/min at a temperature of 300.degree. C., the bending strength of 300 to 1600 kg.f/cm.sup.2 and the Shore hardness of from 45 to 60, obtained by mixing and stirring from 65 to 95% by weight of powdery carbon of an average particle size of 10 to 150 .mu.m and from 5 to 35% by weight of powdery boron carbide of an average particle size of 0.5 to 2.5 .mu.m until the powdery boron carbide is uniformly dispersed in the powdery carbon, and sintering the thus formed mixture at a temperature of 2020.degree. C. or more and less than the transition point at which the structure of carbon and boron carbide in the thus formed mixture is remarkably changed, under a pressure of 100-250 kg/cm.sup.2.

Sliding member of graphite-boron carbides

Disclosed herein is a heat resistant vaned stirrer for use in a high temperature atmosphere. To endure stirring operations in high temperature molten metals of 300.degree.-1200.degree. C., the stirrer vanes are formed of a carbon-ceramics composite material which is produced from coke powder blended with 10-50% by volume of ceramics powder and which has a bending strength higher than 200 kg/cm.

Vaned stirrer for use in high temperature atmosphere

The carbonaceous body of the invention is prepared by shaping and sintering uniform powdery mixture composed of a powder of a low-temperature coke, a powder of boron carbide and a powder of silicon carbide in such a proportion that the weight proportion of the boron carbide and the silicon carbide is in the range from 2:98 to 80:20 and the volume proportion of the coke powder and the combination of the boron carbide and silicon carbide is in the range from 50:50 to 95:5. The carbonaceous body thus obtained is highly resistant against air oxidation even at a temperature of 1400.degree. C. in addition to the outstandingly high mechanical strengths in comparison with conventional carbonaceous shaped materials such as artificial graphite.

Silicon carbide-boron carbide carbonaceous body

Growing community of inventors

Tosu, Japan

Tsuyoshi Hagio