论文部分内容阅读
研究了消失模铸渗法中合金颗粒粒度、粘结剂含量、复合熔剂含量和浇注温度等因素对铸渗工艺的影响 ,给出了合适的铸渗涂层涂料配比。制备了铸铁HT2 0 0表面渗铬复合材料 ,分析了铸渗层的组织和性能。结果表明合金化涂料配比较优方案为Cr Fe粉末粒度为 0 .12 7～ 0 .181mm ,水溶性酚醛树脂含量为 2 % (质量分数 ) ,复合熔剂为 7.5 % (质量分数 )以及适量水和微量添加剂。浇注温度的适宜范围为 14 0 0～ 15 0 0℃。影响消失模铸渗工艺的各因素主次顺序依次为浇注温度 ,合金粉末粒度 ,粘结剂含量和复合熔剂含量。铸渗层由外向里可分为3个区 ,碳化物类型由M7C3 向M3 C转变 ,且硬度逐渐降低。表面合金化层的耐磨性为正火 45 #钢的 2 .8倍。
The effects of various factors, such as alloy particle size, binder content, compound flux and pouring temperature, on the infiltration and infiltration process were studied, and the suitable composition ratio of the infiltration coating was given. The cast iron HT2 0 0 surface chromized composite material was prepared and the microstructure and properties of the cast infiltrated layer were analyzed. The results show that the optimum proportion of alloying coating is that the particle size of CrFe powder is 0.127-0.1181mm, the content of water-soluble phenolic resin is 2% (mass fraction), the composite flux is 7.5% (mass fraction) Trace additives. The optimum range of pouring temperature is 1400 ~ 1500 ℃. The order of influencing factors of EPC process is pouring temperature, alloy powder particle size, binder content and compound flux content. The infiltration into the outer layer can be divided into three zones, carbide types from M7C3 to M3 C transition, and the hardness decreased. The wear resistance of the surface alloying layer is 2.8 times normalized 45 # steel.