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一、自熔性的研究作为火焰喷焊用自熔合金的粉末,应具有“自熔性”,即合金熔点低,并在熔融过程中,合金中的成分能自行形成焊剂,从而得到良好的烧结合金。通常的自熔合金是在镍基合金中加入硼和硅,它们能还原合金中的氧化物,而所生成的B_2O_3、SiO_2在表面形成低熔点的液态复合氧化物薄膜(如SiO_273%,B_2O_327%的薄膜,熔点722℃),这种薄膜防止合金中镍、铬、铁等元素的氧化,起着焊剂的作用,使喷射层在重熔
First, the study of self-fluxing Self-fluxing alloy for flame spray welding powder, should have a “self-fluxing”, that is, the low melting point of the alloy, and in the melting process, the composition of the alloy can form their own flux, resulting in good Sintered alloy. The usual self-fluxing alloys are boron and silicon added to the nickel-base alloy, which can reduce the oxides in the alloy, and the formed B2O3, SiO2 form a low melting point liquid composite oxide film on the surface (such as SiO_273%, B_2O_327% Of the film, the melting point of 722 ° C), this film to prevent the alloy of nickel, chromium, iron and other elements of oxidation, plays the role of flux, the jet layer remelting