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对汽车发动机用气门材料SUH3(进气阀)及SUH36(排气阀)的耐磨损表面处理法,一般来说,一直进行镀硬铬处理。但是,为了发动机的高性能化,由于采取排气措施,带来了发动机零件的高温化。随着镀铬层的软化,产生了磨损量增大以及成本提高的问题,因而转为采用在高温下磨损特性优越、在成本方面有利的氮化处理的汽车正在增加。 作为对这些耐热钢的氮化处理法,当前,已有报告指出软氮化处理及氧氮化处理都是可能的。
The wear-resistant surface treatment methods for SUH3 (intake valve) and SUH36 (exhaust valve), which are valve materials for automobile engines, have been generally treated with hard chrome plating. However, in order to improve the performance of the engine, exhausting measures have brought about a rise in the temperature of engine components. As the chrome plating layer softens, there arises a problem of an increase in the wear amount and an increase in the cost, and therefore, a car converted to nitriding which is superior in wear characteristics and cost-effective at a high temperature is increasing. As a nitriding method for these heat-resisting steels, at present, it has been reported that both soft nitriding and oxynitriding are possible.