摘要
ＳｉＯ２可以作为石墨的形核基底．纯Ｓｉ和Ｆｅ—Ｓｉ合金对铸铁都没有任何孕育效果，当含有少量Ｃａ、Ｓｒ、Ａｌ等元素时才会产生明显的孕育效果．孕育铸铁的共晶团的数目与石英棒晶化层的厚度有密切的关系，晶化层越厚，共晶团数目越多．用Ｃａ—Ｓｉ孕育时，石英玻璃棒的晶化速度相当于在空气中的１０００倍．当用含Ｃａ的Ｓｉ或Ｆｅ—Ｓｉ孕育剂孕育时，吸附于玻璃态ＳｉＯ２的表面，促使非晶态ＳｉＯ２发生晶化，晶化的ＳｉＯ２作为石墨的基底，产生明显的孕育作用．
SiO2 may have been made as the basis of graphite nuclei. Pure St and Fe-Si alloy have on extinct inoculating effect to cast iron except that there are a little of factors such Ca,Sr,Al etc. in it. The number of symbioticcrystal in inoculation cast iron is closely relating to the thickness of the quartz pod layer. The thicker the crystal--lay er is.the more the symbiotic crystal numbers are. When inoculating with Ca-Si,the speed of crystallization aroundquartz pod is as 1000 times as that in the air. When inoculating with Si or Fe-Si alloy inoculum including Ca,it attaches to the surface of glassed SiO2,making the no-crystal SiO2 to crystallize. Crystallizing SiO2 may make extinct inoculation effect as the basis of graphite.
出处
《热加工工艺》
CSCD
北大核心
1996年第5期17-20,共4页
Hot Working Technology
关键词
石墨
孕育
共晶团
铸铁
形核
graphite
inoculation
symbiotic crystal
