一、前言由于我国汽车工业正在飞跃发展,年生产量和保有量逐年增加,对汽车发动机的使用寿命和可靠性提出了更高的要求。而发动机的使用寿命和可靠性取决于主要运动件(活塞、活塞肖和活塞环等)的磨损与损坏情况。就发动机的活塞而言,要求具备重量轻、导热性好、膨胀系数小,并有足够的耐高温耐热疲劳性能、耐磨及耐腐蚀等等。为此,金陵汽配厂等单 I. INTRODUCTION As China’s auto industry is undergoing rapid development, annual production and retention have increased year by year, placing higher demands on the useful life and reliability of automotive engines. The service life and reliability of the engine depend on the wear and damage of the main moving parts (pistons, pistons, piston rings, etc.). In terms of the piston of the engine, it is required to have light weight, good thermal conductivity, small expansion coefficient, and sufficient high-temperature and heat-resistant fatigue resistance, wear resistance, and corrosion resistance. To this end, Jinling Auto Parts Factory and other orders