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采用不同粉料制备了4种模壳面层并在1600~1620℃浇注了K441合金铸件,利用扫描电镜、能谱及表面粗糙度测量仪研究了铸件表面组织、成分和表面粗糙度。实验结果表明,石英玻璃粉面层、锆英石粉面层、刚玉粉面层及EC95粉面层在高温下都会与K441合金中的Al或C发生化学反应,石英玻璃粉面层反应最严重,铸件表面有类似气泡类缺陷出现,其铸件表面粗糙度达Ra4.97μm,使用锆英石粉面层铸件表面粗糙度为Ra2.57μm,使用EC95面层铸件表面粗糙度为Ra2.05μm,使用刚玉粉面层反应程度最轻,其表面粗糙度只为Ra1.55μm。
Four kinds of shell molds were prepared with different powder materials and K441 alloy castings were cast at 1600-1620 ℃. The surface microstructure, composition and surface roughness of castings were studied by SEM, EDS and surface roughness measuring instrument. The experimental results show that quartz glass powder surface layer, zircon powder surface layer, corundum powder surface layer and EC95 powder surface at high temperatures and K441 alloy Al or C chemical reaction occurs, quartz glass powder surface reaction is the most serious, The surface of the casting is similar to bubble-like defects, the surface roughness of the casting is Ra4.97μm, the surface roughness of the casting surface with zircon powder is Ra2.57μm, the surface roughness of the casting surface of EC95 surface is Ra2.05μm, The lightest surface reaction, the surface roughness of only Ra1.55μm.