在金属材料热处理时,采用保护涂层的方法进行无氧化、无脱碳加热,不需特种设备,投资少,工艺简便。该工艺特别适用于小批或单件生产,或需局部保护的零件(如螺纹)。因而国内外都在推广应用。西安油漆厂在研制热处理保护涂科上做了大量工作,我厂配合进行了一系列的工艺试验,现将情况加以介绍。一、涂料四安油漆厂研制的几种热处理保护涂料是有机物和无机物的混合物。在常温下,由于有机物的粘结作用,使之形成均匀完善的保护涂层。热处理时,涂层中的有机组分在高温下分解碳化,而玻璃陶瓷材料迅速烧结粘附,在最初生成的涂层基础上转变为一层均匀、完整、致密的无机保护层,隔绝加热气氛对金属的影响。冷却时,利用玻璃陶瓷涂层与金属之间膨胀系数相差较大的特性,使涂料自行剥落,从而使 In the heat treatment of metal materials, the use of protective coating method for non-oxidation, non-decarburization heating, without special equipment, less investment, process is simple. The process is particularly suitable for small batch or single piece production, or the need for local protection of parts (such as thread). Therefore, both at home and abroad to promote the application. Xi’an Paint Factory in the development of heat treatment to protect the Tu made a lot of work, I plant with a series of process tests, the situation will be introduced. First, the paint Four safety paint factory developed several heat treatment protective coating is a mixture of organic and inorganic. At room temperature, due to the bonding effect of organic matter, to form a uniform and perfect protective coating. During the heat treatment, the organic components of the coating decompose and carbonize at high temperature, and the glass ceramic material rapidly sinters and adheres, and turns into a uniform, complete and dense inorganic protective layer on the basis of the originally formed coating, isolating the heating atmosphere Effect on metals. Cooling, the use of glass-ceramic coating with a large difference between the coefficient of expansion of the metal properties, so that the paint itself off, so that