CAJ | 학술논문

采用热压烧结方法分别制备了 Al2 O 3-TiCN 复合陶瓷(AT)及掺杂 MgO-Y2 O 3复合助剂的 Al2 O 3-TiCN 复合陶瓷(ATMY)；研究了烧结温度和 MgO-Y2 O 3复合助剂对复合陶瓷相对密度、显微组织及力学性能的影响.结果表明：当烧结温度在1400~1600℃时,AT 和 ATMY 的相对密度均在97．3％以上；当烧结温度不超过1500℃时,利用第二相 TiCN 可有效抑制 Al2 O 3晶粒长大,AT 和 ATMY 的显微组织、断裂韧度均无明显差异；当烧结温度超过1500℃时,TiCN 不能有效地抑制 Al2 O 3晶粒长大,导致 AT 显微组织粗化,在1600℃烧结的 AT 的断裂韧度为4．5 MPa.m 1
채용열압소결방법분별제비료 Al2 O 3-TiCN 복합도자(AT)급참잡 MgO-Y2 O 3복합조제적 Al2 O 3-TiCN 복합도자(ATMY)；연구료소결온도화 MgO-Y2 O 3복합조제대복합도자상대밀도、현미조직급역학성능적영향.결과표명：당소결온도재1400~1600℃시,AT 화 ATMY 적상대밀도균재97．3％이상；당소결온도불초과1500℃시,이용제이상 TiCN 가유효억제 Al2 O 3정립장대,AT 화 ATMY 적현미조직、단렬인도균무명현차이；당소결온도초과1500℃시,TiCN 불능유효지억제 Al2 O 3정립장대,도치 AT 현미조직조화,재1600℃소결적 AT 적단렬인도위4．5 MPa.m 1
Al2 O 3-TiCN ceramic (AT)and MgO-Y2 O 3 doped composite ceramic (ATMY)were fabricated by hot-pressing sintering.The effects of sintering temperature and MgO-Y2 O 3 additive on the relative density, microstructure and mechanical property of composite ceramics were studied.The results show that the relative density of AT and ATMY was not less than 97.3% at the sintering temperature from 1 400 ℃ to 1 600 ℃.When the sintering temperature was no more than 1 500 ℃,the second phase of TiCN could effectively inhibit grain growth in Al2 O 3 substrate due to the grain boundary pinning effect,and there was no obvious difference between AT and ATMY of the microstructures and fracture toughness.When the sintering temperature was higher than 1 500 ℃,TiCN phase was unable to inhibit the grain growth of Al2 O 3 ,resulting in the microstructure coarsening of AT.The fracture toughness of AT sintered at 1 600 ℃ was 4.5 MPa. m1/2 .The doped MgO-Y2 O 3 additive cooperated with the second phase of TiCN could effectively inhibit the grain growth in Al2 O 3 substrate.When sintered at 1 600 ℃,the microstructure of ATMY was small and uniform,and the fracture toughness reached as high as 5.1 MPa.m1/2 .