无压烧结和气压烧结对氮化硅陶瓷性能的影响  

Effect of Pressureless Sintering and Gas Pressure Sintering on Properties of Silicon Nitride Ceramics

作　　者：满延进[1] 王伟伟 王营营[2] 刘胜[1] 王晓东 韩卓群 宋涛[2] 李伶[2] MAN Yanjin;WANG Weiwei;WANG Yingying;LIU Sheng;WANG Xiaodong;HAN Zhuoqun;SONG Tao;LI Ling(Beijing Power Machinery Research Institute,Beijing 100074,China;Shandong Industrial Ceramic Research&Design Institute Co.Ltd.,Zibo 255000,Shandong,China;School of Materials Science and Engineering,University of Jinan,Jinan 250022,Shandong,China)

机构地区：[1]北京动力机械研究所,北京100074 [2]山东工业陶瓷研究设计院有限公司,山东淄博255000 [3]济南大学材料科学与工程学院,山东济南250022

出　　处：《陶瓷学报》2023年第6期1183-1189,共7页Journal of Ceramics

基　　金：国家重点研发计划(2022YFB3706300);山东省重点研发计划(2022CXPT003)。

摘　　要：以氮化硅粉末为主要原料,分别采用无压烧结和气压烧结的方式制备氮化硅陶瓷,研究了无压及气压烧结对氮化硅陶瓷的硬度、密度、强度及韧性的影响,研究了1300℃氧化5 h对氮化硅陶瓷抗氧化性能和表面微观形貌的影响。结果表明:采用无压及气压烧结制备的氮化硅陶瓷力学性能数值相近,但是气压烧结制备的氮化硅陶瓷性能相对稳定,同时展现出更好的断裂韧性,断裂韧性平均值为12.6 MPa·m^(1/2)。1300℃氧化5 h,Si_(3)N_4表面被氧化生成玻璃相的SiO_(2)并存在有明显裂纹。相比无压烧结,气压烧结展现出更好的抗氧化性能及高温强度性能,其氧化增重率和弯曲强度平均值分别为0.014%和304.2 MPa。Using silicon nitride powder as the main raw material to prepare silicon nitride ceramics by using pressureless sintering and gas pressure sintering.Effects of the two methods on the density,hardness,strength and toughness of the silicon nitride ceramics were studied.Oxidation resistance and surface morphology of the silicon nitride ceramics were examined at 1300℃ for 5 h.It is found that mechanical properties of the silicon nitride ceramics prepared by using the two methods were similar.However,the properties of the ceramics prepared by using the gas pressure sintering were relatively stable and had higherfracture toughness,with an averagevalue of 12.6MPa·m^(1/2).Surface ofthe Si_(3)N_4 was oxidized to glass phase SiO_(2) with obvious cracks at 1300℃ for 5 h.Compared with pressureless sintered one,the gas pressure sintered sample showed stronger oxidation resistance and high temperature strength.The average oxidation gain rate and flexural strength were 0.014%and 304.2 MPa,respectively.

关 键 词：氮化硅 无压烧结 气压烧结 强度 氧化 

分 类 号：TQ174.75[化学工程—陶瓷工业]