Grain growth kinetics and grain refinement mechanism in Al2O3/WC/TiC/graphene ceramic composite. Issue 2 (February 2021)

• Record Type: Journal Article
• Authors: Wang, Xuchao; Zhao, Jun; Cui, Enzhao; Sun, Zhefei; Yu, Hao
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 2(2021)
• Page Start: 1391
• Page End: 1398
• Publication Date: 2021-02
• Subjects: Ceramic composite -- Graphene -- Grain growth kinetics -- Grain refinement mechanism; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.10.019
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The grain growth kinetics and grain refinement mechanism of Al2 O3 grains and WC grains in Al2 O3 /WC/TiC/graphene ceramic composite were investigated in this work. The grain growth exponent of Al2 O3 was determined as 2, which conformed to the growth mechanism of grain boundary diffusion. Meanwhile, the grain growth exponent of WC was determined as 3, which conformed to the grain growth mechanism of volume diffusion or liquid-phase diffusion. The different wettability of graphene to Al2 O3 and WC was responsible for their different grain growth mechanisms. By analyzing grain growth activation energy, it can be concluded that the grain growth of Al2 O3 and WC went through three stages: (1) softening stage, (2) rapid growth stage and (3) stable stage. The grain refinement mechanism of Al2 O3 grains was graphene pinning effect and intragranular structure, and the grain refinement of WC grains could be attributed to the strong bonding interface between WC and graphene.