Densification behavior of ZrB2–MoSi2–SiCw composite processed by multi stage spark plasma sintering. Issue 22 (15th November 2021)

• Record Type: Journal Article
• Authors: Paul, Tanay Rudra; Mondal, Manas Kumar; Mallik, Manab
• Is Part Of: Ceramics international. Volume 47:Issue 22(2021)
• Page Start: 31948
• Page End: 31972
• Publication Date: 2021-11-15
• Subjects: Borides -- Core-rim -- Solid solution -- Dislocation -- Fracture toughness; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.08.081
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: This study reports the densification behavior and novel design of core-rim microstructure for different ZrB2 –MoSi2 -SiCw (ZMSw ) composites. Four ZrB2 –MoSi2 composites containing various amounts of SiCw (0, 5, 10, and 20 vol%) were densified by multistage spark plasma sintering. Optimal combinations of sintering schedule, temperature, and composition are recognized for producing dense ZrB2 -based ceramic-matrix composite with core-rim grain structure in the boride matrix, where ZrB2 core is surrounded by a solid solution of (Mo, W)Si2 . Fragmentation, rearrangement, plastic deformation, and grain boundary diffusion mechanisms are responsible for densification of composites sintered by multistage SPS conditions at 1700 °C. Addition of SiCw significantly improves the density and mechanical properties of ZrB2 –MoSi2 –SiCw composites due to the formation of a core-rim structure.