Materials Reports 2021, Vol. 35 Issue (Z1): 169-171 |
INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Effect of Carbon Content on Microstructure and Properties of Pressureless-sintered Silicon Carbide |
LIU Baoyou1,2, YUE Xinyan1,2, FENG Dong1,2, RU Hongqiang1,2, LIU Chunming1,2
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1 Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education, Northeastern University, Shenyang 110819, China 2 Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China |
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Abstract In the present study, using samples with 1wt% B4C addition prepared by pressureless sintering at 2 000 ℃, the effect of carbon content on the microstructure and mechanical properties of solid-state sintered silicon carbide ceramics was investigated. The experimental results were as follows: XRD patterns of all samples with different carbon content were almost same with each other. SiC as main phase and a trace amount of C were identified, B4C phase was not detected. When carbon content was 3wt%, the sample showed the optimum mechanical properties of which the volume density, relative density, bending strength, fracture toughness and Vickers hardness were 98.6%, 452 MPa, 4.5 MPa·m1/2, 30 GPa, respectively. With increasing carbon content, the grain size of silicon carbide gradually increased and some abnormal grain growth occurred which could decrease the mechanical properties of this material.
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Published: 16 July 2021
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Fund:National Key Research and Development Projects(2017YFB0310300). |
About author:: Baoyou Liu, master of Northeastern University, the main research is sintered silicon carbide and silicon carbide ultra-fine powder purification.Hongqiang Ru is a professor and doctoral supervisor in Northeastern university. Research interests: advanced ceramic, new friction material, ceramic/metal composites, new bulletproof material and new powder metallurgical material. Resent years he has hosted more than 30 high National 863 Technologies Initiatives and National Natural Science Foundation of China. Fruitful achievements have achieved in pressure-less sintering of high-tech SiC ceramic, pressure-less sintering of high-tech B4C ceramic, preparation of high-performance 3D SiC ceramic, pressure-less sintering pf TiB2 and preparation of ceramic/metal composites. Research results won provincial and ministerial level scientific and technological awards 6 times. He has published over 230 papers through international and national academic journals and 2 books. He has filed 20 new patent applications to the national patent of invention. And 15 patents have been granted. |
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