Authors: Wang, C. B.¹; Zhang, S.²; Shen, Q.²; Zhang, L. M.²

Source: Materials Science and Technology, Volume 25, Number 6, June 2009 , pp. 809-812(4)

Publisher: Maney Publishing

Abstract:

Boron carbide ceramics were simultaneously synthesised and densified from B and C elemental powders by a spark plasma sintering method. The reactive sintering process was investigated, and two stages of large shrinkage corresponding to synthesis and densification of boron carbide were observed. At stage I (1300–1700°C), B reacted with C and the product in phase of free C and B rich boron carbide (B_4+xC) was synthesised. With increasing the sintering temperature, C atoms diffused into the B_4+xC lattice, resulting in the reduction in free C content and the decreasing in lattice parameters of B_4+xC. At stage II from 1700 to 1900°C, the densification of the synthesised boron carbide occurred. The product was densified gradually and a high relative density (95%) was obtained by spark plasma sintering at 1900°C.

Keywords: XRD; REACTIVE SINTERING; BORON CARBIDE; SPARK PLASMA SINTERING

Document Type: Short Communication

DOI: http://dx.doi.org/10.1179/174328408X363371

Affiliations: 1: State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;, Email: wangcb@whut.edu.cn 2: State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Publication date: 2009-06-01

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