Low‐temperature reactive sintering of carbon vacant high‐entropy carbide ceramics with in‐situ formed silicon carbide. Issue 4 (21st December 2021)

• Record Type: Journal Article
• Authors: Lin, Guo‐Wei; Liu, Ji‐Xuan; Qin, Yuan; Zhang, Guo‐Jun
• Is Part Of: Journal of the American Ceramic Society. Volume 105:Issue 4(2022)
• Page Start: 2392
• Page End: 2398
• Publication Date: 2021-12-21
• Subjects: high‐entropy carbide -- high‐entropy ceramics -- low‐temperature sintering -- microstructure -- reactive sintering; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.18276
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: It is thought that the sintering of high‐entropy (HE) ceramics is generally more difficult when compared to that of the corresponding single‐component ceramics. In this paper, we report a novel approach to densify the HE carbide ceramics at relatively low temperatures with a small amount of silicon. Reactive spark plasma sintering (SPS) was used to densify the ceramics using powders of HE carbide and silicon as starting materials. Dense ceramics can be obtained at 1600 ‐1700°C. X‐ray diffraction analysis reveals that only non‐stoichiometric HE carbide phase with carbon vacancy and SiC phase exist in the obtained ceramics. The in‐situ formed SiC phase inherits the morphology of the starting silicon powder owing to the slower diffusion of silicon atoms compared to that of the carbon atoms in HE carbide phase. The mechanical properties of the prepared ceramics were preliminarily studied.