ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 62, (1) 74 - 80 (2018)


EFFECT OF Na₂B₄O₇ ADDITION ON THE STRUCTURE AND PROPERTIES OF Al₂O₃ CERAMIC-LINED STEEL PIPE PREPARED BY THE GS-SHS METHOD
 
Hou Xinghui, Yu Jingkun
 
School of Metallurgy, Northeastern University, NO. 3-11, Wenhua Road, Heping District, Shenyang, 110819, P. R. China

Keywords: Gravitational separation, SHS method, Na₂B₄O₇additive, composite steel pipe, bonding quality, ceramic coating
 

By adding Na₂B₄O₇ into the Al-Fe₂O₃-Cr₂O₃ reaction system, the Al₂O₃ ceramic-lined steel pipe was prepared with the gravitational separation SHS method, and the influence of the Na₂B₄O₇ addition on the structure and properties of the produced composite steel pipe was investigated. The obtained results showed that the phase composition of the ceramic coating was Al₂O₃-FeCr Alloy-(Al0.9Cr0.1)₂O₃ composite, and with the increase of the amount of Na₂B₄O₇ addition, the Fe-Cr alloy particles left in the ceramic coating increased and distributed uniformly, and the denser ceramic coating was obtained. However, when the amount of Na₂B₄O₇ addition increased further to over 4%, the ceramic coating became fractures, the hardness of ceramic coating decreased. The transition structure of steel pipe-transition layer-ceramic coating was formed, the thickness of the transition layer decreased with the addition of Na₂B₄O₇, and the boundaries between the transition layer and the ceramic layer were less obvious, which would have a significant effect on the improvement of the bonding quality of the composite steel pipe.


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doi: 10.13168/cs.2017.0047
 
 
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