摘要
在无压烧结基础上,探究微量MgO-Y2O3和MgO-Y2O3-La2O3两种体系添加剂的掺杂以及一步非等温烧结法和两步非等温烧结法对Al2O3陶瓷的显微结构和性能的影响。结果表明,两步非等温烧结法可显著细化Al2O3陶瓷晶粒;对于掺杂微量MgO-Y2O3烧结助剂体系,一步非等温烧结法和两步非等温烧结法制备的Al2O3陶瓷闭气孔率分别为1.88%和3.93%,对应的Al2O3晶粒分别为0.42μm和0.38μm。对于掺杂微量MgO-Y2O3-La2O3烧结助剂体系,一步非等温烧结法和两步非等温烧结法制备的陶瓷闭气孔率分别为3.59%和2.82%,对应的Al2O3晶粒分别为0.40μm和0.42μm。分别选用MgO-Y2O3和MgO-Y2O3-La2O3作为烧结助剂时,一步非等温烧结法制备的Al2O3陶瓷具有较高的硬度,分别为(18.3±0.5)GPa和(18.2±0.6)GPa。对于断裂韧性有较高需求场合,则可以选用MgO-Y2O3作为烧结助剂通过一步非等温烧结法直接制备Al2O3陶瓷,其断裂韧性可达到(4.6±0.3)MPa·m1/2。
On the basis of pressure less sintering,the effects of MgO-Y2O3,MgO-Y2O3-La2O3 additives and sintering process containing one-step and two-step non-isothermal sintering on the microstructure and properties of Al2O3 ceramics were studied.The results show that using non-isothermal sintering method can significantly refine the Al2O3 grains.When MgO-Y2O3 are used as sintering aids,the closed porosity of Al2O3 ceramics prepared by one-step sintering and two-step non-isothermal sintering method are 1.88%and 3.93%,respectively,and its corresponding Al2O3 grains are 0.42μm and 0.38μm,respectively.At the same time,when MgO-Y2O3-La2O3 are used as sintering additives,the closed porosity of ceramics prepared by one-step sintering method and two-step non-isothermal sintering method are 3.59%and 2.82%,respectively,and its corresponding Al2O3 grains are 0.40μm and 0.42μm,respectively.When MgO-Y2O3 and MgO-Y2O3-La2O3 are used as sintering aids,the Al2O3 ceramics prepared in a one-step sintering process have higher hardness,and they are(18.3±0.5)GPa and(18.2±0.6)GPa,respectively.In order to obtain the higher fracture toughness,it is necessary to use MgO-Y2O3 as a sintering aid to prepare Al2O3 ceramic by one-step sintering method,and the fracture toughness value can reach(4.6±0.3)MPa·m1/2.
作者
方豪杰
贺亦文
张晓云
牛文彬
吴利翔
郭伟明
黄荣厦
乔冠军
林华泰
曾雄
FANG Haojie;HE Yiwen;ZHANG Xiaoyun;NIU Wenbin;WU Lixiang;GUO Weiming;HUANG Rongxia;QIAO Guanjun;LIN Huatai;ZENG Xiong(Hunan Meicheng Ceramics Technology Co.,Ltd.,Loudi 417600,China;School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China;Hunan Engineering Research Center of Electronic Functional Ceramics,Loudi 417600,China;Hunan Jialixin Ceramic Technology Co.,Ltd.,Loudi 417600,China)
出处
《粉末冶金材料科学与工程》
2021年第6期525-530,共6页
Materials Science and Engineering of Powder Metallurgy
基金
湖南省科技攻关计划(2019GK4039)。
关键词
氧化铝
烧结助剂
非等温烧结
显微结构
力学性能
alumina
sintering aids
non-isothermal sintering
microstructures
mechanical properties
