This paper describes the development of new Si
3
N
4
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.
Si
3
N
4
ceramics has high Young's modulus, therefore it provides lower coefficient of friction than iron. We thought that if adsorption ability of Si
3
N
4
to lubricant oil were improved, coefficient of friction got still lower. In order to achieve this Fe
3
O
4
, which has superior adsorption ability, were used as one of additives for Si
3
N
4
. The obtained new Si
3
N
4
had obviously lower coefficient of friction than conventional Si
3
N
4
and it's strength were almost same as conventional Si
3
N
4
. Moreover, cylinder liner and piston ring were fabricated from developed Si
3
N
4
. They were tested using engine and reduction of friction force was confirmed.
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