Abstract：In order to reduce the thermal expansion coefficient of SiC-based composites, this paper composited positive thermal expansion material SiC and negative thermal expansion material β-eucryptite to prepare a near-zero expansion SiC-based composite, and systematically studied the effects of β-eucryptite content on the porosity, microstructure, thermal and mechanical properties of the material. The results show that with the increase of β-eucryptite content, the porosity of the material decreases, the closed porosity increases, and the pores gradually change from irregular shape to spherical shape. Under the dual effect of porosity and β-eucryptite phase, the coefficient of thermal expansion of the material decreases. When the mass fraction of β-eucryptite increases from 20% to 50%, the average coefficient of thermal expansion of the material at 30-1 200 ℃ decreases from 2.30×10-6 K-1 to -0.80×10-6 K-1, the porosity decreases from 36.9% to 12.9%, the thermal conductivity increases from 6.31 W/(m·K) to 8.85 W/(m·K), and the compressive strength increases from 176.3 MPa to 375.6 MPa.
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2024, Vol. 29 
