摘要
分别以熔融石英球形粉、角形粉为原料,采用注射成型工艺制备陶瓷型芯,对比型芯的烧结收缩和二次烧结收缩,并结合SEM和XRD分析,探讨了添加熔融石英球形粉对陶瓷型芯高温收缩的影响。研究结果表明:当混合粉粒度级配相近时,由100%熔融石英球形粉制备的型芯在1200℃的烧结收缩率远小于由角形粉制备的型芯;在SiO2-ZrSiO4和SiO2-Al2O3型芯原料配比不变时,添加熔融石英球形粉可起到抑制原有型芯料烧结收缩的作用;随着球形粉添加量的增大,型芯的烧结收缩率有不同程度的降低。熔融石英球形粉对型芯烧结收缩的抑制作用与球形粉中残留的石英晶相含量高及其高温方石英化有关。添加熔融石英球形粉对型芯1500℃二次烧结收缩的影响不大。
Ceramic cores with fused silica spherical particles were prepared by injection molding.Compared with the comminuted particles,the effects of fused silica spherical particles on sintering shrinkage at 1 200℃and 1 500℃were investigated by SEM and XRD.The results showed that the ceramic cores with 100%fused silica spherical particles had a smaller sintering shrinkage at 1 200℃than cores with 100%fused silica comminuted particles when the particle size distributions of fused silica were similar.When the proportion of raw materials(not include spherical particles)was constant,adding spherical particles could inhibit the sintering at 1200℃of SiO 2-ZrSiO 4 and SiO 2-Al 2O 3 ceramic cores,and the decreases of sintering shrinkage varied with the increasing amount of spherical particles.The native reaction of spherical particles on ceramic sintering is likely to relate to the residual quartz phase in spherical particles and the transformation to cristoballite phase.The additive of spherical particles had no significant influence with the further shrinkage at 1 500℃of silica based ceramic cores.
作者
王丽丽
姚建省
许亮
杨小薇
顾国红
李鑫
牛书鑫
WANG Lili;YAO Jiansheng;XU Liang;YANG Xiaowei;GU Guohong;LI Xin;NIU Shuxin(Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2019年第14期2311-2314,共4页
Materials Reports
关键词
球形粉
氧化硅基陶瓷型芯
烧结收缩
二次烧结收缩
spherical particles
silica based ceramic core
sintering shrinkage
further sintering shrinkage
