1 前言近年来,随着柴油机输出功率的不断提高,活塞承受的热应力与机械应力也相应上升,从而导致活塞顶燃烧室周壁龟裂,这一现实已成为铝活塞面临的棘手问题。铝活塞龟裂预防对策有多种手段:变更毛坯制作方法即用高压铸造或锻造取代重力铸造,由硬膜阳极化处理来改善铝活塞顶面耐热性能,以及采用陶瓷纤维或陶瓷晶须增强金属来制作活塞,等等。本文就各种对策中的阳机化处理特别是对快速硬膜阳极化处理方法作介绍,几年来作者所在公司一直采用该法生产铝活塞。 2 铝活塞热龟裂与阳极化处理 1 Introduction In recent years, as the output power of diesel engines continues to increase, the thermal stress and mechanical stress that the piston withstands also rise correspondingly, resulting in the cracking of the perimeter wall of the piston top combustion chamber. This fact has become a thorny issue for aluminum pistons. There are many ways to prevent the aluminum piston cracking: Changing the roughing method is to replace the gravity casting by high-pressure casting or forging, to improve the heat resistance of the top surface of the aluminum piston by anodizing, and to use ceramic fiber or ceramic whisker to enhance Metal to make piston, and so on. In this paper, a variety of countermeasures in the positive treatment, especially for rapid anodizing hard anodizing methods introduced for several years the author company has been using the method to produce aluminum piston. 2 aluminum piston thermal cracking and anodizing treatment