活塞的选购选购活塞时应注意的问题有：活塞的材料情况；与活塞环相配合的情况；与活塞销相配合的情况；裙部尺寸、形状，以及与气缸体相配合的情况。１．活塞的材料活塞的材料需要抗热强度高，热膨胀系数小，传热性能好，耐磨损，重量轻，其中最好的材料是过共晶铝合金，... Piston optional When purchasing the piston should pay attention to the problems are: the material of the piston; with the piston ring with the situation; with the piston pin matches the situation; skirt size, shape, and with the cylinder body match. 1. Piston material Piston material needs high heat resistance, small thermal expansion coefficient, good heat transfer, wear resistance, light weight, of which the best material is hypereutectic aluminum alloy, ...