The main friction area on the piston and cylinder is measured and compared, which proves that Ceramic-Mental FGM can decrease the friction and wear between the cylinder and piston.

• 试验比较结果显示，气缸体及活塞的主要接触面的磨损量很小，发动机功率下降不明显，这表明梯度功能材料在发动机上能够起较好的作用。