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镍基高温合金中的防护涂层根据渗涂时采用的涂敷介质及渗涂温度不同基本上可以分成二种类型的铝化物防护层:内扩散型渗层(又称高铝活度渗层)及外扩散型渗层(又称低铝活度渗层)。如果涂渗的温度在760℃—950℃,常常在合金表面上生成内扩散型渗层;若涂渗过程中温度在1000℃以上,往往会在合金表面上生成外扩散型渗层。
Protective coatings in nickel-base superalloys can be basically divided into two types of aluminide protective layers depending on the coating medium used and the temperature at which the coating is applied: a diffusion-type diffusion layer (also referred to as a high-alumina activity layer ) And diffusion type diffusion layer (also known as low aluminum activity layer). If the infiltration temperature is in the range of 760 ° C - 950 ° C, the inner diffusion type diffusion layer is often formed on the alloy surface. If the temperature is more than 1000 ° C during the coating process, the outer diffusion type diffusion layer tends to be formed on the alloy surface.