Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 131, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2020.105800
Keywords
Ceramic-matrix composites; 3-Dimensional reinforcement; Thermal properties; Mechanical properties
Funding
- National Natural Science Foundation of China [51872222]
- National Key Research and Development Program of China [2017YFB0310400]
- Technology Innovation Leading Program of Shaanxi [2019QYPY-088]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM5033]
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Tungsten carbide (WC) reinforced highly oriented graphite flake composites were obtained using a combined process of surface-coating and spark plasma sintering techniques. Uniform and continuous three-dimensional WC skeleton was formed in the samples with WC concentration higher than 7 vol%, rendering the resulting dense composites light, mechanical strong, high thermal conductive and with low thermal expansion. The skeleton architecture played a role of thermal expansion constraint which remarkably reduced the thermal expansion from 28 x 10(-6) K-1 for highly oriented graphite matrix to similar to 5 x 10(-6) K-1 for the composite with 26 vol% WC in the direction parallel to the sintering pressure. Concurrently, the composite with 26 vol% WC exhibited bending strength up to similar to 95 MPa, thermal conductivity up to similar to 381 W.m(-1).K-1 in direction perpendicular to the sintering pressure. The created highly oriented graphite-based composites with uniform 3D ceramic reinforcement are expected to be applied in thermal management of current demanding situation.
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