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针对21—4N排气阀在国内汽车工业中应用的所谓“麻坑”问题,用扫描电镜与能谱分析等方法对排气阀的损坏原因作了详细的解剖分析,并相应研究了能够有效延长气阀寿命的保护涂层。
In view of the so-called “Ma Hang” problem of 21-4N exhaust valve used in the domestic automobile industry, the cause of the damage of the exhaust valve is analyzed in detail by means of scanning electron microscope and energy spectrum analysis, and correspondingly, Protective coating to extend valve life.