Effects of Y2O3/MgO ratio on mechanical properties and thermal conductivity of silicon nitride ceramics. Issue 5 (21st April 2022)

• Record Type: Journal Article
• Authors: Li, Shishuai; Chen, Huanbei; Wang, Weide; Yao, Dongxu; Xia, Yongfeng; Zeng, Yu‐Ping
• Is Part Of: International journal of applied ceramic technology. Volume 19:Issue 5(2022)
• Page Start: 2873
• Page End: 2882
• Publication Date: 2022-04-21
• Subjects: flexural strength -- silicon nitride -- thermal conductivity -- Y2O3/MgO ratio; Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.14067
• Languages: English
• ISSNs: 1546-542X

Abstract

Abstract: In this work, the effects of Y2 O3 /MgO ratio on the densification behavior, phase transformation, microstructure evolution, mechanical properties, and thermal conductivity of Si3 N4 ceramics were investigated. Densified samples with bimodal microstructure could be obtained by adjusting the ratio of Y2 O3 /MgO. It was found that a low Y2 O3 /MgO ratio facilitated the densification of Si3 N4 ceramics while a high Y2 O3 /MgO ratio benefited the phase transformation of Si3 N4 ceramics. Best mechanical properties (flexural strength of 875 MPa, and fracture toughness of 8.25 MPa·m 1/2, respectively) and optimal thermal conductivity of 98.04W/(m·K) were achieved in the sample fabricated with Y2 O3 /MgO ratio of 3:4 by sintering at 1900°C for 4 h.