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以铝铁为供铝剂、氯化氨为活化剂、碳化硅为填充剂,研究了耐热钢HP40Nb在800～900℃间的粉末法渗铝特性,采用固体强化渗碳方式来研究不同状态试样的抗渗碳能力。研究表明:渗层表面质量很高,渗层与基体结合良好,渗层主要由沉积区和过渡区两部分组成,较之高温渗铝,渗层厚度较薄;采用直流电场增强法对HP40Nb粉末法渗铝渗层相组成种类影响不大,但能使其800℃时的渗铝速度提高近7倍。所试验渗铝层在1000℃强化渗碳条件下表现出优良的抗渗碳特性。
Aluminum-aluminum for the aluminum, ammonia chloride as an activator, silicon carbide as a filler, heat-resistant steel HP40Nb 800 ~ 900 ℃ in the powder between the aluminized characteristics of the method of solidified carburizing mode to study the different states Anti-carburizing ability of the sample. The results show that the surface of the permeable layer is of high quality and the interface between the permeable layer and the substrate is good. The permeable layer mainly consists of sedimentary zone and transitional zone. The thickness of the permeation zone is thinner than that of the aluminized zone. The DC40- The method of aluminized seepage layer has little effect on the composition of phase, but it can make the aluminizing speed increase about 7 times at 800 ℃. The aluminized coatings tested showed excellent carburizing resistance at 1000 ° C with intensive carburization.