初始粉体状态对氧化铝/氧化锆纳米陶瓷烧结性能的影响  

Effects of starting powders on sinterability of Al_(2)O_(3)-ZrO_(2) nanoceramics

作　　者：范长颉 李鑫[2] 许西庆 张鑫 牛书鑫 FAN Changjie;LI Xin;XU Xiqing;ZHANG Xin;NIU Shuxin(Sixth Military Representative Office of Air Force Equipment Department in Beijing,Beijing 100095,P.R.China;Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,P.R.China;School of Materials Science&Engineering,Chang?an University,Xi'an 710061,P.R.China)

机构地区：[1]空装驻北京地区第六军事代表室,北京100024 [2]北京航空材料研究院先进高温结构材料重点实验室,北京100095 [3]长安大学材料科学与工程学院,西安710064

出　　处：《重庆大学学报（自然科学版）》2019年第12期67-73,共7页Journal of Chongqing University

基　　金：中央高校基本科研业务费专项资金资助项目(CHD300102319303);陕西省省级大学生创新创业训练计划项目资助(S201910710300)

摘　　要：通过放电等离子体烧结(SPS),分别以纳米多晶粉体和非晶粉体作为原料制备了Al2O3-ZrO2纳米陶瓷复合材料,并研究了初始粉体状态对致密化过程和微观结构的影响。将纳米多晶粉体通过SPS烧结为致密的纳米块体,所需的最低烧结温度为1 400℃,所得产品的晶粒尺寸约为320nm;非晶粉体完全致密所需的SPS温度为1 200℃,所得产品的晶粒尺寸约为150nm。相比于纳米多晶粉体,非晶粉体可以在较低的温度下烧结成为致密纳米块体,我们将这一现象归结为非晶粉体在烧结中的相转变。这一发现为纳米陶瓷块体的低温烧结提供了新的思路。In this work,Al2O3-ZrO2 nanocomposites were prepared by spark plasma sintering(SPS)of nanocrystalline and amorphous powders,respectoively,and effects of starting powders on the densification and microstructure of the nanocomposites were investigated.To obtain dense nanocomposites,the minimum SPS temperature for nanocrystal powders was 1 400℃,and the resulting grain sizes were about320 nm.For amorphous powders,however,the hot pressing temperature was as low as 1 200℃,and the products exhibited finer grains of about 150 nm.It was confirmed that amorphous powders could be hot pressed into dense nanocomposites at lower temperatures than nanocrystalline powders,and the easier densification of amorphous powders was attributed to the phase transformation of amorphous particles in sintering.This finding could provide new guidance for low temperature sintering of bulk nanocomposites.

关 键 词：放电等离子体烧结 纳米复相陶瓷 晶粒尺寸 低温烧结 相转变 

分 类 号：TQ174.4[化学工程—陶瓷工业]