Damnification Mechanism of SiC Heating Elements Used in N2 Atmosphere
[1]LlU Xinhong,NIU Zhiwang,ZHOU Chaojie,et al.Damnification Mechanism of SiC Heating Elements Used in N2 Atmosphere[J].Journal of Zhengzhou University (Engineering Science),2014,35(03):20-28.[doi:10.3969/j.issn.1671-6833.2014.03.005]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
35
Number of periods:
2014 03
Page number:
20-28
Column:
Public date:
2014-06-30
- Title:
- Damnification Mechanism of SiC Heating Elements Used in N2 Atmosphere
- Keywords:
- SiC heating elements ; N2 atmosphere ; damnification mechanism
- CLC:
- TQI75.1
- Abstract:
- Phase composition and mierostructure of SiC heating elements used in N2 atmosphere have been analyzed by XRD and SEM, and the damnification mechanism of SiC heating elements is discussed. The resultsshow: there are many pores in unchanged part which provide channels for the corrosive gas leading to damnifi-cation, and the impurities Si, K2O and FeSi would accelerate damnification during use ; a protective film inthe surface of SiC cannot fom in N2 atmosphere due to low pressure of O2,and the trace O2, in N2 atmospherereaets with SiC leading to structure loosing which inereases oxidizing damage; Al(g), Al2O(g)and CO(g)firom refraetories containing Al, Si and C reaet with SiC to form β-SiC and Al2O3, which leads to damage.
- References:
- -
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