一、前言 镁橄榄石砂是生产碱性合金钢铸件的良好碱性造型材料,它的耐火度高,热膨胀均匀缓慢,无游离的SiO_2不与MnO、Cr_2O_3等碱性氧化物发生反应,抗金属侵蚀能力强,能有效地防止铸件产生粘砂、气孔、针孔等缺陷,能提高铸件表面质量,减轻劳动强度,改善生产环境。但是镁橄榄石砂资源有限,国内 I. Introduction Forsterite sand is a good alkaline molding material for producing alkaline alloy steel castings. Its high refractoriness, uniform and slow thermal expansion, no free SiO 2 does not react with basic oxides such as MnO and Cr 2 O 3, and the anti-metal Strong erosion, can effectively prevent the casting produce sticky sand, pores, pinholes and other defects, can improve the casting surface quality, reduce labor intensity and improve the production environment. But forsterite sand resources are limited, domestic