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Enhanced Mechanical and Electromagnetic-Wave-Absorption Properties of Ceramic Matrix Composites Fabricated by Novel Laser-Machining-Assisted CVI

J. Wang, Y. Liu, L. Cheng, X. Chen, Q. Zhou, Z. Hou, F. Ye

Journal of Ceramic Science and Technology, Vol. 9, No. 1 (2018), pp. 79-84

DOI: 10.4416/JCST2017-00080

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Abstract

A novel technique based on laser-machining-assisted chemical vapor infiltration (LA-CVI) was proposed and developed to fabricate ceramic matrix composites (CMCs). The results showed that the compressive strength, the shear strength and the bending strength of the C/SiC composites increased by 50.7 %, 11.8 % and 17.8 %, respectively, compared with those of classical CVI-C/SiC composites. The improvement can be attributed to the reopening of the diffusion channels and formation of a dense band and a coating around the channels. On the other hand, the minimum reflection loss (RL) of the C/SiC composites fabricated by means of LA-CVI improved 307 % against that of CVI-C/SiC composites in the frequency range of 8 GHz to 18 GHz owing to the multiple reflection of the electromagnetic (EM) waves in periodic micro-holes. The advantages of the LA-CVI method with regard to improving mechanical properties and the EM-wave-absorption properties of CMCs were demonstrated.

Keywords

Ceramic matrix composites, laser-machining-assisted CVI, mechanical properties, electromagnetic-wave-absorbing properties

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