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Effect of the Content of SiC on Properties of ZrB2-SiC-Zr2Al4C5 Composite Ceramics
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School of Civil Engineering,Northwest Minzu University,School of Civil Engineering,Northwest Minzu University,School of Civil Engineering,Northwest Minzu University,State Key Lab of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,State Key Lab of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology

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    Abstract:

    The ZrB2/SiC/Zr2Al4C5 composite ceramics with various content of SiC were sintered at 1800 oC and 20 MPa by spark plasma sintering. The sintering behavior, microstructure, mechanical properties and oxidation resistance were studied. The results indicate that SiC promoted the sintering of the composite ceramics and suppressed the growth of ZrB2 grains. When the content of SiC was 20 vol%, the composite ceramic showed a toughness of 4.81 MPa×m1/2. As increasing the content of SiC, the oxidation resistance of composite ceramics was obviously enhanced. The oxidation-resulted increase in weight of composite ceramic with 20vol% SiC was the best performance in oxidation resistance at 1500 oC. The high-temperature oxidation resulted in dense and stable Al2O3, B2O3-Al2O3, SiO2 and Al-Si-O glass due to adding SiC into the composite ceramics, those resulting products effectively blocked the oxygen atoms entering into the ceramic matrix, which led to the apparent enhancement of the oxidation resistance.

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[GUO Qilong, PEI Junun, WANG jing, LI Junguo, ZHANG Lianmeng. Effect of the Content of SiC on Properties of ZrB2-SiC-Zr2Al4C5 Composite Ceramics[J]. Rare Metal Materials and Engineering,2018,47(S1):282~287.]
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History
  • Received:June 29,2017
  • Revised:February 09,2018
  • Adopted:February 12,2018
  • Online: October 22,2018