摘要
采用机械合金化和热压烧结的方法制备了3种不同成分配比的Si-B-C-N-Zr陶瓷,对比分析了3种陶瓷的物相组成、显微形貌和力学性能。结果表明,3种陶瓷的主要物相都为ZrB_(2)、BN(C)、ZrN、SiC、m-ZrO_(2)和ZrOx相,且ZrB_(2)和ZrN含量会随着Zr和B含量增加而增多;热压烧结后3种陶瓷表面都存在一定数量的气孔,但是未见其它裂纹等缺陷存在,整体呈现出片层状组织特征;相同热压烧结工艺处理后陶瓷的密度、抗弯强度、断裂韧性和维氏硬度从大至小顺序为:陶瓷C>陶瓷B>陶瓷A,即热压烧结陶瓷的密度、抗弯强度、断裂韧性和维氏硬度会随着Zr和B含量的增加而增大;相同热压烧结工艺处理后陶瓷的弹性模量从大至小顺序为:陶瓷A>陶瓷B>陶瓷C。SZ3T1900陶瓷具有相对较高的抗弯强度、断裂韧性和维氏硬度,这主要与其具有较高的致密度以及形成了较多的ZrB_(2)相有关。
Three kinds of Si-B-C-N-Zr ceramics with different compositions were prepared by mechanical alloying and hot pressing sintering.The phase composition,microstructure and mechanical properties of the three ceramics were compared and analyzed.The results show that the main phases of the three ceramics are ZrB_(2),BN(C),ZrN,SiC,m-ZrO_(2)and ZrOx,and the content of ZrB_(2)and ZrN will increase with the content of Zr and B;there are a certain number of pores on the surface of the three ceramics after hot pressing sintering,but no other cracks and other defects are found,showing the characteristics of lamellar structure as a whole;the after the same hot pressing sintering process,the order of density,bending strength,fracture toughness and Vickers hardness is:ceramics C>ceramics B>ceramics A,that is,the density,bending strength,fracture toughness and Vickers hardness of hot pressed sintered ceramics will increase with the increase of Zr and B content;the order of elastic modulus of ceramics treated by the same hot pressed sintering process is:ceramics A>ceramics B>ceramics C.SZ3T1900 ceramics have relatively high bending strength,fracture toughness and Vickers hardness,which are mainly related to its high density and the formation of more ZrB_(2)phase.
作者
丁秀荣
DING Xiu-rong(Chifeng Vocational and Technical College of Industry,Chifeng 024000,Inner Mongolia,China)
出处
《合成材料老化与应用》
2021年第4期102-104,共3页
Synthetic Materials Aging and Application
关键词
机械合金化
热压烧结
陶瓷
显微组织
力学性能
mechanical alloying
hot pressing sintering
ceramics
microstructure
mechanical properties
