摘要
通过共沉淀法获得包覆式A12O3-Y2O3/ZrB2复合粉体,对其进行放电等离子烧结以提高ZrB2陶瓷的烧结致密度。用扫描电镜观察试样的显微结构,用X射线衍射仪对试样进行物相分析。结果表明:包覆型粉体在700～1000℃时出现1次大的收缩,然后出现1个不收缩的平台,当温度达到1100℃之后出现第2次收缩。适宜制备高致密的ZrB2-钇铝石榴石(yttrium aluminium garnet,YAG)陶瓷的工艺条件为:烧结温度为1700℃,烧结压力为20MPa,保温时间为4min,YAG的添加量为30%(质量分数),所制备的ZrB2-YAG陶瓷相对密度大于95%。
ZrB2-coated Al2O3-Y2O3 composite powder prepared by co-precipitation method was densified via spark plasma sintering （SPS）. The microstructure and properties of the densified products were investigated by scanning electron microscopy and X-ray diffraction. The results indicate that the sintering of coated composite powder show two shrinkage stages during sintering： at temperatures from 700 to 1 000 ℃ and at temperatures above 1 100 ℃. The optimal sintering conditions for high-density ZrB2-yttrium aluminum garnet （YAG） ceramics are by sintering at 1 700 ℃ a pressure of 20 MPa, with a holding time of 4 rain and YAG content of 30% （in mass）. The relative density of the prepared ZrB2-YAG ceramics is higher than 95%.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第4期586-590,共5页
Journal of The Chinese Ceramic Society
基金
国家“973”计划(51331)
江西省教育厅青年科学基金(GJJ09595)资助项目。
关键词
二硼化锆陶瓷
钇铝石榴石
致密化
放电等离子烧结
zirconium boride ceramics
yttrium aluminum garnet
densification
spark plasma sintering
