International Journal of Applied Ceramic Technology· 2026Q2
Hot Pressing Sintering and Properties of Silicon Carbide/Graphite Composite Ceramics Containing 30 wt% Graphite
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- Q2SCImago
- 2026year
Short summary
Hot pressing sintering enables the preparation of silicon carbide/graphite composites with 30 wt% graphite, achieving a bulk density of 2.763 g/cm³, bending strength of 318 MPa, and a low coefficient of friction of 0.172.
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Key points
- Hot pressing sintering and spray-drying granulation overcome densification barriers in SiC/graphite composites with 30 wt% graphite.
- Optimized sintering at 2125°C and 40 MPa produced SiC/C30 with a bulk density of 2.763 g/cm³.
- Mechanical properties include bending strength of 318 ± 3.8 MPa and fracture toughness of 2.36 ± 0.023 MPa·m¹/².
- Functional properties include thermal conductivity of 69.92 ± 0.39 W/(m·K) and a low coefficient of friction of 0.172 ± 0.00010.
AI-generated from the title and abstract; the full text is not read.
Abstract
ABSTRACT Silicon carbide/graphite composite ceramics containing 30 wt% (SiC/C30) and 35 wt% (SiC/C35) graphite were fabricated by hot pressing sintering, and the sintering behavior, microstructure, mechanical properties, and functional properties of the composite ceramics were investigated in detail. The combination of spray‐drying granulation and hot pressing sintering synergistically overcomes the densification barrier caused by high graphite content. The external driving force supplied by hot pressing sintering not only promotes densification, but also facilitates the formation of a continuous conductive network even when the carbon content is high. The appropriate sintering conditions with a temperature of 2125°C and a pressure of 40 MPa allow the preparation of SiC/C30 composite ceramics with superior mechanical properties and excellent functional performance with a bulk density of 2.763 g/cm 3 , a bending strength of 318 ± 3.8 MPa, a Vickers hardness of 5.73 ± 0.09 GPa, a fracture toughness (K IC ) of 2.36 ± 0.023 MPa·m 1/2 , a room‐temperature thermal conductivity of 69.92 ± 0.39 W/(m·K), an electrical conductivity of 8.932 ± 0.102 S/m, and coefficient of friction (COF) of 0.172 ± 0.00010.
The authors' abstract, as published at the source. International Journal of Applied Ceramic Technology, 2026 · DOI ↗
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Field: Ceramics and Composites
Ceramics and CompositesMaterials Science