| 摘要 |
A metal of which the body of a piston is formed contains iron as its main component, and the configuration of a silicon nitride member, the high-temperature strength of the silicon nitride material that composes the silicon nitride member, the melting point of the iron-containing metallic material and the inserting conditions satisfy the following formulae (1) and (2) or formulae (3) and (4): k1x DELTA Tx(1/R1-1/R2)+k2xl2x DELTA T<0.5 sigma c (1) Tc=Tm-0.413xlx DELTA T (2) k1xTmx(1/R1-1/R2)+k2xl2xTm<0.5 sigma c (3) Tc=Tm-0.413xlxTm (4) The joint between the silicon nitride member and the metallic material need not be subjected to machining. Therefore, the manufacturing process is simple and the cost is low. Furthermore, only a low level of stress is generated in the silicon nitride member at low temperatures. Also, the joint between the silicon nitride member and the metal body has a high strength, hence, a high reliability, even at high temperatures, and the silicon nitride member hardly breaks during insert-casting.
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