Cr_(2)O_(3)添加对ZTA复相陶瓷显微结构和力学性能的影响  

Effect of Cr_(2)O_(3) Addition on Microstructure and Mechanical Properties of ZTA Composite Ceramics

作　　者：王泽楷 朱丽慧[1] 张兆泉[2] 范武刚[2] 王晓姣 梁锁贤 康龙武 黄颖璞 WANG Zekai;ZHU Lihui;ZHANG Zhaoquan;FAN Wugang;WANG Xiaojiao;LIANG Suoxian;KANG Longwu;HUANG Yingpu(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;School of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]中国科学院上海硅酸盐研究所,上海200050 [3]南京工业大学材料科学与工程学院,南京211816

出　　处：《硅酸盐学报》2022年第3期742-749,共8页Journal of The Chinese Ceramic Society

基　　金：国家重大科技专项(2017ZX06002004)。

摘　　要：采用无压烧结制备ZTA复相陶瓷,探究Cr_(2)O_(3)的添加对ZTA复相陶瓷显微组织和力学性能的影响。结果表明:Cr_(2)O_(3)会促进Al_(2)O_(3)晶粒的生长,并出现长条状Al_(2)O_(3)晶粒;随着Cr_(2)O_(3)的增加,复相陶瓷的密度、硬度、断裂韧性均呈现先增大后减小趋势。在Cr_(2)O_(3)添加量为0.6%时具有最佳性能,但过多的Cr_(2)O_(3)会使陶瓷内部气孔增多,性能下降。添加纳米级Cr_(2)O_(3)的ZTA复相陶瓷力学性能整体高于添加微米级Cr_(2)O_(3)试样。纳米级Cr_(2)O_(3)使Al_(2)O_(3)的平均晶粒尺寸更小,陶瓷的密度和硬度更高;产生的长条状晶粒数目更多,裂纹扩展需要更多的能量,断裂韧性更高。ZTA composite ceramics were prepared via pressureless sintering,and the influence of Cr_(2)O_(3)doping on the microstructure and mechanical properties of ZTA ceramics was investigated.The results show that Cr_(2)O_(3)can promote the growth of Al_(2)O_(3)grains and obtain elongated Al_(2)O_(3)grains.The density,hardness and fracture toughness of ZTA ceramics firstly increase and then decrease with the increase of Cr_(2)O_(3)addition.ZTA ceramics with 0.6%Cr_(2)O_(3)addition exhibit the optimum properties.However,the properties of ZTA ceramics with the excessive addition of Cr_(2)O_(3)can be impaired due to the increased internal porosities.The mechanical properties of ZTA composite ceramics with Cr_(2)O_(3)nano-sized particles are superior to those with Cr_(2)O_(3)micron-sized particles.The addition of Cr_(2)O_(3)nano-sized particles results in greater density and hardness of ZTA ceramics due to the smaller average grain size of Al_(2)O_(3).Besides,the fracture toughness of ZTA ceramics improves due to the formation of more elongated grains and the consumption of more energy for crack propagation.

关 键 词：氧化铬 氧化锆增韧氧化铝复相陶瓷 显微组织 力学性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]