摘要
以Al_(2)O_(3)为各层的基体相,Y2O3为各层的烧结助剂,ZrB_(2)、TiC0.7N0.3分别为AZ层和AT层的添加相,利用粉末旋转铺层法和真空热压烧结技术,在1650℃下制备了具有不同层厚比的Al_(2)O_(3)-ZrB_(2)/Al_(2)O_(3)-TiCN层状陶瓷,研究了层厚比对其微观组织和力学性能的影响。结果表明:随着层厚比的增大,层状陶瓷的相对密度、维氏硬度、抗弯强度均呈现先增大后减小的趋势,而其断裂韧性逐渐增大。层厚比为4∶1时,材料的致密度较高,晶粒相对较小且分布均匀,获得了较好的综合力学性能,其分别为表层维氏硬度(19.28±0.25)GPa、抗弯强度(637.68±20)MPa、表层断裂韧性(7.81±0.35)MPa·m^(1/2)。
Al_(2)O_(3)-ZrB_(2)/Al_(2)O_(3)-TiCN layered ceramics with different layer thickness ratios were prepared at 1650℃by powder rotating layer method and vacuum hot pressing sintering technology with Al_(2)O_(3)as the matrix phase of each layer,Y2O3 as the sintering aid of each layer,ZrB_(2)and TiC0.7N0.3 as the additive phases of AZ layer and AT layer,respectively.The effects of layer thickness ratio on the microstructure and mechanical properties were studied.The results show that with the increase of layer thickness ratio,the relative density,Vickers hardness and bending strength of laminated ceramics increase first and then decrease,while the fracture toughness increases gradually.When the layer thickness ratio is 4∶1,the relative density of the material is higher,the grains are relatively small and uniformly distributed,and good comprehensive mechanical properties are obtained,which are surface Vickers hardness of(19.28±0.25)GPa,bending strength of(637.68±20)MPa,surface fracture toughness of(7.81±0.35)MPa·m^(1/2),respectively.
作者
孟维其
高姣姣
刘家宝
胡士恒
王瑶
宋金鹏
MENG Weiqi;GAO Jiaojiao;LIU Jiabao;HU Shiheng;WANG Yao;SONG Jinpeng(College of Mechanical and Vehicle Engineering and Shanxi Key Laboratory of Procision Machining,Taiyuan University of Technology,Taiyuan 030024,China;College of Aeronautics and Astronautics,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《热加工工艺》
北大核心
2025年第23期102-106,112,共6页
Hot Working Technology
基金
国家自然科学基金资助项目(51875388,52205492)
山西省高等学校科技创新项目(2021L067)。
关键词
层状陶瓷
层厚比
微观组织
力学性能
laminated ceramics
layer thickness ratio
microstructure
mechanical properties
