Environment-Friendly Preparation of Reaction-Bonded Silicon Carbide by Addition of Boron in the Silicon Melt

Abstract

Reaction-bonded silicon carbide ceramics were sintered by infiltration of Si and B–Si alloy under an argon atmosphere at different temperatures. The element boron was added to the silicon melt to form a B–Si alloy first. The mechanical properties of samples were improved by infiltration of the B–Si melt. The samples infiltrated with the Si-only melt were found to be very sensitive to experimental temperature. The bending strengths of 58.6 and 317.0 MPa were achieved at 1530 and 1570 °C, respectively. The sample made by infiltration of B–Si alloy was successfully sintered at 1530 °C. The relative density of the sample was more than 90%. The infiltration of B–Si alloy reduced the sintering temperature and the bending strength reached 326.9 MPa. The infiltration mechanism of B–Si alloy is discussed herein.

Microstructure Evolution and Performance Improvement of Silicon Carbide Ceramics via Impregnation Method

“…Generally, the green body fabricated by additive manufacturing needs to be sintered to obtain the properties suitable for application. For SiC ceramics, the common sintering techniques include liquid phase sintering [ 12 ], hot-pressing sintering [ 13 ] and liquid silicon infiltration [ 14 ]. Compared with other techniques, liquid silicon infiltration (LSI) has the advantages of a short cycle, near net-shape forming and excellent performance of the sintered body (RB-SiC).…”

Special Issue on Silicate Solid Waste Recycling

“…While in the research from Choo, the coal fly ash, which is a combustion waste produced by a coal-fired power plant, was recycled in the production of clay ceramics [ 5 ]. An environment-friendly preparation method of reaction-bonded silicon carbide ceramics was reported by Ye [ 12 ].…”