烧结压力对热压掺钙铬酸镧陶瓷组织和性能的影响  

Effect of sintering pressure on microstructure and properties of hot pressed calcium-doped lanthanum chromate ceramic

作　　者：赖旭平 严炜文 王良辉[2] Lai Xuping;Yan Weiwen;Wang Lianghui(Naval Equipment Department,Chengdu Sichuan 610036,China;School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)

机构地区：[1]海军装备部,四川成都610036 [2]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《金属热处理》2022年第11期76-81,共6页Heat Treatment of Metals

基　　金：国家重点研发计划(2016YFB1200505)。

摘　　要：采用热压法在不同烧结压力下制备了高密度掺钙铬酸镧基陶瓷(La_(0.8)Ca_(0.2)Cr_(0.98)O_(3)),研究了烧结压力对La_(0.8)Ca_(0.2)Cr_(0.98)O_(3)陶瓷微观结构、力学性能和导电性能的影响。结果表明,当烧结压力大于58 MPa时,在烧结陶瓷中检测到第二相CaCr_(2)O_(4)的存在。CaCr_(2)O_(4)在烧结陶瓷中有两种完全不同的形态。烧结压力的提高不仅可以提高铬酸镧基陶瓷的密度,同时能显著抑制晶粒长大。随着烧结压力的增加,弯曲强度和硬度逐渐增加,但是断裂韧度和电导率发生下降。High density calcium-doped lanthanum chromate ceramic(La_(0.8)Ca_(0.2)Cr_(0.98)O_(3))was prepared by hot pressing under different sintering pressures.The effect of sintering pressure on microstructure,mechanical properties and electrical conductivity of La_(0.8)Ca_(0.2)Cr_(0.98)O_(3) ceramic was studied.The results show that when the sintering pressure is greater than 58 MPa,the second phase CaCr_(2)O_(4) can be detected in the sintered ceramics.There are two completely different forms of CaCr_(2)O_(4) in the sintered ceramics.The increase of sintering pressure can not only improve the density of lanthanum chromate ceramic,but also inhibit the grain growth significantly.With the increase of sintering pressure,the flexural strength and hardness increase gradually,but the fracture toughness and conductivity decrease.

关 键 词：热压烧结 La_(0.8)Ca_(0.2)Cr_(0.98)O_(3)陶瓷 高密度 力学性能 导电性 

分 类 号：TG132.24[一般工业技术—材料科学与工程]