Densification behavior and mechanical properties of spark plasma reaction sintered ZrB2–ZrC-B4C ceramics from B4C-Zr system. Issue 9 (15th June 2019)

• Record Type: Journal Article
• Authors: Chen, Huan; Zeng, Fanhao; Li, Wenjie; Liu, Ji'an; Gu, Yi; Zhang, Fuqin
• Is Part Of: Ceramics international. Volume 45:Issue 9(2019)
• Page Start: 12122
• Page End: 12129
• Publication Date: 2019-06-15
• Subjects: Spark plasma reaction sintering -- ZrB2-ZrC-B4C ceramics -- Mechanical properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.03.112
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The ZrB2 -ZrC-B4 C multiphase ceramics were produced by spark plasma reaction sintering (SPRS) from boron carbide (B4 C) with different volume of zirconium (Zr). With Zr content increases, the B4 C phases in the composite decreased gradually, and the zirconium carbide (ZrC) phase gradually increased. With Zr content increased to 70 vol%, the morphology of the zirconium diboride (ZrB2 ) changed from equiaxed crystal to platelet crystal. During the solid reaction process of Zr with B4 C, carbon (C) was preferentially replaced to generate ZrB2, and then the remaining Zr reacted with C to form ZrC. With the increase of Zr content, the flexure strength and fracture toughness of the ZrB2 -ZrC-B4 C composite ceramics increased due to improved microstructure and more crack deflection and intergranular fracture.