复合添加剂对熔融石英陶瓷析晶的影响  

Effects of composite additives on crystallization behavior of fused quartz ceramics

作　　者：卜景龙[1] 申书斌[1] 于立学[1] 王志发[1] 

机构地区：[1]河北省无机非金属材料重点实验室河北联合大学材料科学与工程学院河北省无机非金属材料重点实验室河北联合大学材料科学与工程学院,河北唐山063009

出　　处：《耐火材料》2012年第4期241-243,共3页Refractories

基　　金：国家自然科学基金资助项目(51072046)

摘　　要：以粒径≤0.10 mm的熔融石英粉为主要原料,分别添加相对于熔融石英粉质量1%、2%、3%的复合添加剂B4C-Yb2O3(B4C与Yb2O3的质量比为1:1)或Si3N4-Nd2O3(Si3N4与Nd2O3的质量比为1:1),以聚乙烯醇为结合剂,经搅拌、成型、干燥后,分别于1300、1350和1400℃埋炭(石墨)保温1 h热处理,然后在常温～1200℃对烧后试样进行热膨胀试验,并对其进行XRD分析,以研究复合添加剂B4C-Yb2O3和Si3N4-Nd2O3对熔融石英陶瓷在热处理过程中析晶的影响。结果表明:添加B4C-Yb2O3或Si3N4-Nd2O3对熔融石英热处理过程中的析晶均有不同程度的抑制作用,且B4C-Yb2O3抑制熔融石英析晶的效果比Si3N4-Nd2O3的更好,尤其是在较高的热处理温度下。Fused quartz ceramics were prepared using fused quartz powder（≤0.10 mm） as main starting material,B4C-Yb2O3 or Si3N4-Nd2O3 with 1：1 of mass ratio as composite additives with dosages of separate 1%（in mass,similarly hereinafter）,2% and 3% of fused quartz ceramics powder mass,polyvinyl alcohol as binder,mixing,shaping,drying,and graphite-embedded firing at 1300,1350 and 1400 ℃ for 1 h,respectively.The thermal expansion test from ambient temperature to 1 200 ℃ and XRD analysis of fired specimens were carried out to research the effects of composite additives B4C-Yb2O3 or Si3N4-Nd2O3 on crystallization behavior of fused quartz ceramics during firing.The results indicate that both B4C-Yb2O3 and Si3N4-Nd2O3 inhibit the crystallization to a certain degree,and the former has better inhibiting effect that the latter,especially at higher firing temperatures.

关 键 词：熔融石英陶瓷 析晶 复合添加剂 碳化硼 氧化镱 氮化硅 氧化钕 

分 类 号：TQ174[化学工程—陶瓷工业]