摘要
化学共沉淀法是制备纳米粉末的有效途径之一 ,但粉末在煅烧过程中产生的团聚现象严重地影响了粉末的各项性能。本文通过在传统的化学共沉淀法中加入一种较新的脱水工艺——蒸馏法制备了纳米级的 Zr O2 复合粉末。结果表明 :蒸馏法能充分地脱去凝胶中残余的水分 ,防止因胶体含水而引起的粉末硬团聚 ,从而显著地提高了粉末的性能。制得的氧化锆复合粉末一次粒径已达到纳米级 ,粉末分散性良好 ,团聚体尺寸小而少 ,并具有较好的烧结性能。经过常压成型后于 1 40 0℃烧结 2小时 ,制备了致密 ( 98.3% )且具有良好晶粒度的氧化锆复合陶瓷。
Chemical coprecipitation was used to produce nanometer powder. But the agglomerates strongly affect the powder's performance. In this paper ultrafine zirconia stabilized with yttria was prepared by adding a new dehydration process —— distillation process in chemical coprecipitation. The result indicated that, the distillation process could effectively dehydrate hydrous zirconia and prevent the formation of the hard agglomerates. The powder with a particle size of 11.8nm was prepared. The powder has good sinter ability, and can reach full density in 1400℃
出处
《硬质合金》
CAS
2000年第1期13-17,共5页
Cemented Carbides
