SiO_2微粉加入量对钛铝酸钙烧结性能的影响  

Effect of SiO_2 fume addition on sintering properties of calcium alumino-titanate

作　　者：王立锋[1] 赵惠忠[1] 冯立 李静捷 张寒[1] 

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]锦州中汇高温陶瓷耐材科技有限公司,辽宁锦州121000

出　　处：《耐火材料》2016年第3期195-198,203,共5页Refractories

基　　金：省部共建耐火材料与冶金国家重点实验室青年基金项目(2014QN09)

摘　　要：为充分利用铝热还原制备钛铁合金过程中产生的副产品钛铝酸钙,并改进其烧结性能,以d50=35μm钛铝酸钙及d50=1.37μm的SiO_2微粉为主要原料,干压成型后在1 450、1 500、1 550和1 600℃保温180 min热处理后制备了钛铝酸钙试样,研究了SiO_2微粉加入量(w)分别为0、0.3%、0.6%、0.9%和1.2%时对试样的线收缩率、体积密度、显气孔率以及显微结构的影响。结果表明:加入0.9%(w)SiO_2微粉时,试样线收缩率较大,体积密度达到最大值3.25 g·cm^(-3),显微结构致密,且加入SiO_2能够促进钛铝酸钙晶粒生长;随着温度的升高,试样的线收缩率以及体积密度逐渐增大,且晶粒不断变大,在1 550℃保温180 min时,钛铝酸钙晶粒间排列较为紧密。In order to utilize the by-product( calcium alumino- titanate) during preparing ferrotitanium alloy using aluminothermic reduction method,and to improve the sintering properties of the by-products,the calcium alumino-titanate specimens were prepared using calcium alumino-titanate( d50= 35 μm) and silica fume( d50= 1. 37 μm) as the main raw materials,dry pressing,then firing at 1 450,1 500,1 550,1 600 ℃for 180 min,respectively. Effects of SiO_2 fume additions( 0,0. 3%,0. 6%,0. 9%,and 1. 2%,by mass) on linear shrinkage rate,bulk density,apparent porosity,and microstructure of calcium alumino- titanate were studied. The results show that: adding 0. 9% SiO_2 fume,the calcium alumino-titanate specimens have larger linear shrinkage rate,denser microstructure and the highest bulk density of 3. 25 g ·cm^(-3). And SiO_2 can promote the growth of calcium alumino- titanate crystals. With temperature rising,the linear shrinkage rate and bulk density of calcium alumino-titanate specimens increase gradually and the grains grow. The intergranular arrangement of calcium alumino-titanate crystals is closer when fired at 1 550 ℃ for 180 min.

关 键 词：SiO₂微粉 钛铝酸钙 添加剂 显微结构 烧结性能 

分 类 号：TQ175.1[化学工程—硅酸盐工业]