石英砂热膨胀性的研究  

Study on Thermal Expansibility of Silica Sands

作　　者：孙清洲[1] 张普庆[1] 荆海鸥[1] 赵忠魁[1] 尹继宝[1] 

机构地区：[1]山东建筑工程学院材料科学与工程学院,山东济南250014

出　　处：《铸造技术》2005年第2期103-105,共3页Foundry Technology

基　　金：山东省自然科学基金资助项目;编号:2003F03

摘　　要：以大林砂、围场砂、平潭砂等为研究对象,采用自制的铸造用砂热膨胀性测定仪,分别对不同产地的铸造用砂的随温热膨胀和等温热膨胀进行了测试,对其热膨胀特性进行了研究。结果发现,石英砂的膨胀以热膨胀为主,相变膨胀为辅。膨胀量受加热温度、砂子粒度以及SiO2 含量的影响。经700 ℃热再生的石英砂的热膨胀性低于同类新砂。The thermal expansibility of foundry silica sands from Dalin, Weichang and Pingtan are studied with a self-developed device for thermal expansion detection. The expansions with temperature and the isothermal expansions are respectively detected, and their thermal expansion characteristics are studied. It is shown that expansions of silica sands mainly result from the thermal expansion with the phase expansion as the secondary. The expansion depends on heating temperature, sand grain sizes, and content of SiO2 in silica sands. The expansions after reclamation at 700°C is lower than that of the new sands.

关 键 词：石英砂 热膨胀 随温曲线 等温曲线 

分 类 号：TG221.1[金属学及工艺—铸造]