SiC复相陶瓷内加热器套管的抗热震及抗氧化性能

模拟内加热器服役环境,将具有复层结构的碳化硅（SiC）复相陶瓷内加热器套管置于金属铝液中,测试套管各部位材料的抗热震及抗氧化性能.通过X射线衍射和扫描电子显微镜研究材料成分和显微结构的变化,分析确定导致内加热器整体失效的原因及部位.结果表明：SiC复相陶瓷套管内管材料在长效氧化条件下残余强度依然达到270 MPa以上,不会导致套管整体失效;外管材料在氧化和热震双重作用下,液面至液面下100 mm处的孔隙率明显增加,残余强度显著降低,这是导致内加热器整体失效的主要原因....

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Bibliographic Details
Published in硅酸盐学报 Vol. 42; no. 6; pp. 698 - 702
Main Author 杨万利 史忠旗 李永锋 赵常见 乔冠军 金志浩
Format Journal Article
LanguageChinese
Published 2014
Subjects
内加热器套管
复层结构
碳化硅
金属铝液
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Summary:模拟内加热器服役环境,将具有复层结构的碳化硅（SiC）复相陶瓷内加热器套管置于金属铝液中,测试套管各部位材料的抗热震及抗氧化性能.通过X射线衍射和扫描电子显微镜研究材料成分和显微结构的变化,分析确定导致内加热器整体失效的原因及部位.结果表明：SiC复相陶瓷套管内管材料在长效氧化条件下残余强度依然达到270 MPa以上,不会导致套管整体失效;外管材料在氧化和热震双重作用下,液面至液面下100 mm处的孔隙率明显增加,残余强度显著降低,这是导致内加热器整体失效的主要原因.
Bibliography:YANG Wanli,SHI Zhongqi,LI Yongfeng,ZHAO Changjian,QIAO Guanjun,JIN Zhihao（State Key Laboratory for Mechanical Behavior of Materials, School of Material Science and Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China）
silicon carbide; immersion heater sheath; molten aluminum; multi-layer structure
11-2310/TQ
The immersion heater sheath of SiC composite ceramic with multi-layer structure was partly immersed into molten aluminum to investigate the thermal shock and oxidation resistance properties of the sheath with different parts.The micro structure and phase composition of the SiC composites were characterized by scanning electron microscope and Xray diffrac tion.The failure reason and failure position for the immersion heater sheath were determined.The results show that the residu al bending strength of inner sheath material keeps higher than 270 Mpa after the lon.term oxidation experiment; which could not lead to the failure of the whole sheath.The outer sheath material is affected by thermal shock toge
ISSN:0454-5648