光亮碳高的煤粉用于型砂，可降低铸件表面粗糙度值。
The use of coal-dust with high lustrous carbon in molding sand can improve surface roughness of the castings.
讨论金属与型壳界面作用对精铸件表面粗糙度和粘砂缺陷的影响。
The effect of metalceramic shell interface reactions on surfaceroughness and the defects of burn on sand in investment casting are discussed in this paper.
在铸造生产中可以促进铸件的方向性凝固，防止粘砂、夹砂等铸造缺陷和改善铸件表面粗糙度。
When using in moulding sand, it can promote oriental solidification of castings and prevent burn-on and sand inclusion of castings, and improve roughness of castings.
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