Effect of silicon addition on the microstructure, mechanical and thermal properties of Cf/SiC composite prepared via selective laser sintering

JOURNAL OF ALLOYS AND COMPOUNDS

卷:792

Article

Fu, Hua¹  Zhu, Wei^1,2  Xu, Zhongfeng¹  Chen, Peng¹  Yan, Chunze¹  Zhou, Kun²  Shi, Yusheng¹ 

[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China

[2] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore Ctr 3D Printing, Singapore 639798, Singapore

关键词: Carbon fiber reinforced SiC ceramics;    Additive manufacturing;    Selective laser sintering;    Liquid silicon infiltration;    Mechanical and thermal properties;   

DOI  :  10.1016/j.jallcom.2019.04.129

来源: Elsevier

【 摘 要 】

Carbon fiber reinforced silicon carbide (C-f/SiC) composite was fabricated by infiltrating liquid silicon (Si) into the carbon preform, which was built by selective laser sintering (SLS) additive manufacturing process from the phenolic resin coated carbon fiber powder with addition of submicron Si. The effect of Si addition on the microstructures of the laser-sintered green part, carbon preform and derived Cf/SiC composite was investigated. The results show that the introduced submicron Si plays an important role in reducing porosity and average pore size of the carbon preform, and contributes to improving the microstructure homogeneity of C-f/SiC composite by reducing the size of continuous bulk carbon in the preforms. The maximum density, flexural strength and fracture toughness of the C-f/SiC composite are 2.89 +/- 0.01 g/cm(3), 237 +/- 9.6 MPa and 3.56 +/- 0.24MPam(1/2), respectively. The coefficient of thermal expansion (CTE) of the C-f/SiC composite is approximately 5.5 x 10(-6)/K from 25 to 900 degrees C, and the thermal conductivity is in the range of 74-84 W/m.K at room temperature, while decreases to 35-40 W/m.K at 900 degrees C. (C) 2019 Elsevier B.V. All rights reserved.

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