Al2O3/WB2 composite ceramic tool material reinforced with graphene oxide self-assembly coated silicon nitride. (June 2019)

• Record Type: Journal Article
• Authors: Zhang, Jingbao; Xiao, Guangchun; Zhang, Jingjie; Yi, Mingdong; Chen, Zhaoqiang; Zhang, Wenliang; Xu, Chonghai
• Is Part Of: International journal of refractory metals & hard materials. Volume 81(2019)
• Page Start: 173
• Page End: 182
• Publication Date: 2019-06
• Subjects: Graphene oxide -- Electrostatic self-assembly -- Microstructure -- Mechanical properties; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2019.03.007
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: Graphene oxide coated silicon nitride coated powder was prepared by electrostatic self-assembly technique. Microstructure analysis shows that GO is uniformly coated on the surface of silicon nitride and evenly dispersed in the matrix material. The microstructure analysis and performance tests were carried out on ceramic tools with different volume contents of Si3 N4 @GO coated powder. The results show that when the content of Si3 N4 @GO is 7. 94 vol%, the comprehensive mechanical properties of Al2 O3 /WB2 /(Si3 N4 @GO) ceramic tool materials are the best, with the Vickers hardness, flexural strength and fracture toughness 18.7GPa, 740 MPa and 8 .2MPa·m 1/2, respectively. Compared with the Al2 O3 /WB2 ceramic tool material, the ceramic tool with Si3 N4 @GO coated powder increased the flexural strength and fracture toughness by 30.3% and 36.7%. Highlights: Graphene oxide coated silicon nitride coated powder was prepared by electrostatic self-assembly technique. The good dispersibility of Si3 N4 @GO coated powder in matrix was studied. The toughening effect of Si3 N4 @GO on Al3 O4 /WB2 -based ceramic tools was analyzed.