Low Frictional Ceramic Materials

Hideki Kita; Hideo Kawamura; Yasuaki Unno; Shigeo Sekiyama

doi:10.4271/950981

1995-02-01

Low Frictional Ceramic Materials 950981

This paper describes the development of new Si₃N₄ ceramics with both low friction coefficient and high strength, aiming at the reduction of friction force between cylinder liner and piston ring in low heat rejection engine.

Si₃N₄ ceramics has high Young's modulus, therefore it provides lower coefficient of friction than iron. We thought that if adsorption ability of Si₃N₄ to lubricant oil were improved, coefficient of friction got still lower. In order to achieve this Fe₃O₄, which has superior adsorption ability, were used as one of additives for Si₃N₄. The obtained new Si₃N₄ had obviously lower coefficient of friction than conventional Si₃N₄ and it's strength were almost same as conventional Si₃N₄. Moreover, cylinder liner and piston ring were fabricated from developed Si₃N₄. They were tested using engine and reduction of friction force was confirmed.

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Low Frictional Ceramic Materials 950981

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