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金属材料表面渗铝,防止高温氧化和抗热腐蚀是沿用已久的方法。迄今为止,广为应用的渗铝工艺仍是粉末包装固渗法。此法操作繁重,粉尘有害健康,特别是在工艺上对于异形小孔结构,要获得整个工件表面有均匀的渗层,有极大的困难。因此,出现有用惰性气流载以金属卤化物或有机金属化合物进行化学气相沉积的气渗方法。我们试验了一种不需要惰性气作载体,在低压下进行气体渗铝的方法。经过在镍基、铁基高温合金等零件上的实际试用,效果良好。低压气相渗铝装置如图1所示。
Aluminized metal surface material to prevent high temperature oxidation and corrosion is a long-standing method of corrosion. So far, the widely used aluminizing process is still powder packing and seepage method. This method is heavy operation, dust harmful to health, especially in the process for the special-shaped hole structure, to get a uniform layer of the entire surface of the workpiece, there is great difficulty. Therefore, there has been a gas-permeation method carried out by chemical vapor deposition of a metal halide or an organometallic compound with inert gas. We experimented with a method of gas aluminizing at low pressure without the need of an inert gas carrier. After the nickel-based, iron-based superalloy and other parts of the actual trial, the effect is good. Low-pressure gas aluminizing device shown in Figure 1.