Formation of core-shell structure in W-added B4C-based composites. Issue 15 (1st August 2021)

• Record Type: Journal Article
• Authors: Liu, Yingying; Ge, Sheng; Yihua Huang, ; Huang, Zhengren
• Is Part Of: Ceramics international. Volume 47:Issue 15(2021)
• Page Start: 21915
• Page End: 21923
• Publication Date: 2021-08-01
• Subjects: Composites -- Vickers hardness -- Fracture toughness -- Core-shell; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.04.209
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: B4 C-TiB2 -SiC composites with W addition were successfully prepared by spark plasma sintering with B4 C, TiB2, SiC, and W as raw materials. The XRD results indicate that the main phases of the composites are B4 C, TiB2, SiC, and W2 B5 . A large number of core-shell structures were observed in the composites with the introduction of W. It is determined that the core is the TiB2 phase and the shell is a (Ti, W) B2 solid solution by EDS, EBSD, and TEM characterization methods. The core-shell structure is conducive to the deflection of cracks, thereby improving the fracture toughness of the composites. As a result, with the increase of W addition from 0 to 5 vol%, the fracture toughness of composites increased from 3.96±0.25 to 5.14±0.23 MPa m 1/2, the Vickers hardness improved from 20.24±0.22 to 28.35±0.22 GPa.