Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 8, Pages 10142-10146Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.01.005
Keywords
SiC; Spark plasma sintering; Microstructure; Mechanical properties; Solid-phase sintering
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Funding
- National Key Research and Development Program of China [2017YFB0310400]
- National Natural Science Foundation of China [51427802]
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Silicon carbide ceramics were densified by spark plasma sintering (SPS) using Silicon carbide (SiC) powders with the sintering aid Boron carbide (B4C). Dense solid-phase sintered SiC ceramics were obtained by SPS with a holding time of 5 min at a temperature of similar to 1800 degrees C, which is similar to 350 degrees C lower than that required by conventional pressureless sintering (PS). The microstructure and mechanical properties of the ceramics was systematically investigated for different sintering temperatures. The sample relative density, flexural strength, hardness, elastic modulus and fracture toughness were determined to be 98.6%, 592 MPa, 28.3 GPa, 461 GPa and 3.6 MPa m(1/2), respectively. The spark plasma sintered specimens showed superior mechanical properties and finer grains compared to the pressurelessly sintered specimen. The densification kinetics for the spark plasma sintered SiC ceramics and the role of B4C in the sintering process were discussed.
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