摘要
用恒沸水解方法（ＢＨ）制备了颗粒度均一（０．１μｍ）的纳米晶（９ｎｍ）２．２ｍｏｌ％Ｙ２Ｏ３－ＺｒＯ２（以下简称：２．２Ｙ－ＺｒＯ２），用化学共沉淀方法（ＣＰ）制备了松散团絮状的纳米晶（２０ｎｍ）２．２Ｙ－ＺｒＯ２。对这两类ＺｒＯ２粉体增韧ＳｉＣ中介金刚石超硬复相陶瓷进行了ＸＲＤ、ＳＥＭ、及韧性、耐磨性分析测定。结果表明，超高压烧结后，水解法ＺｒＯ２在ＳｉＣ中介相内以均一的粒度（０．１μｍ）均匀分布，并以１００％ｔ相存在，断裂时ｔ→ｍ相变量达３８ｖｏｌ％，冲击韧性达１６．８Ｊ／ｃｍ２，磨耗比为５．５×１０４。而化学沉淀法制备的ＺｒＯ２在ＳｉＣ中介相内呈不均匀粒度分布，ｔ相存量６２ｖｏｌ％，断裂过程ｔ→ｍ相变量为１７ｖｏｌ％．耐磨性和韧性较低。
Two kinds of 2.2mol%Y 2O 3-ZrO 2 powders were prepared by chemical coprecipitation (CP)and boiling hydrolysis(BH)methods.The structure and properties of SiC diamond composite toughened with these two powders were investigated by XRD and SEM. The results indicated that ZrO 2 prepared by BH method diispersed homogeneously on the matrix of SiC bonded phase with homogenous particle size and 100%t ZrO 2 was maintained after sintered at ultra high pressure.38vol%t ZrO 2 transformed to m -ZrO 2 during fracture process and impact toughness is 16.8J/cm 2, G ratio is 5.5×10 -4 .The ZrO 2 prepared by CP method dispersed with some large agglomelates and only 62vol%t ZrO 2 was maintained .The amount of the t -ZrO 2 tranformed to m ZrO 2 during fracture process was ony 17vol%.The toughness and grinding ration were low.
出处
《人工晶体学报》
CSCD
北大核心
1998年第1期80-83,共4页
Journal of Synthetic Crystals
基金
国家自然科学基金
关键词
团聚
金刚石
碳化硅
增韧
复合陶瓷
二氧化锆
ZrO 2
agglomelate
ultra high pressure
diamond
SiC
tomghened cowposite
hydrolysis method
chemical coprecipituon method
