| CONG Shu-lin,LIU Feng-en,LIU Fu-dong,SHI Hai-fang.Effects of SiO2 on the Structure and Wear Resistance of TIG Cladding Co-based Boride Layer[J],44(10):46-51 |
| Effects of SiO2 on the Structure and Wear Resistance of TIG Cladding Co-based Boride Layer |
| Received:June 02, 2015 Revised:October 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.10.008 |
| KeyWord:activity TIG cladding Co-based boride layer Co60 B4 C active agent SiO2 microstructure wear resistance |
| Author | Institution |
| CONG Shu-lin |
Liaoning Institute of Science and Technology, Benxi , China |
| LIU Feng-en |
Liaoning Institute of Science and Technology, Benxi , China |
| LIU Fu-dong |
Liaoning Institute of Science and Technology, Benxi , China |
| SHI Hai-fang |
Liaoning Technical University, Fuxin , China |
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| Abstract: |
| Objective To prove that the added active agents SiO2 can improve the macro-morphology, hardness, wear resistance, microstructure and physical phase of cobalt-based boride layer. Methods The cobalt-based composite cladding layer containing 8% B4C was fabricated on the surface of Q235 steel with the active argon arc cladding technology, using Co60 and B4C as the basic materials, and SiO2 as the active agent. The effects of the addition of SiO2 on the size of the cladding layer cross section were analyzed, and then the hardness of the cladding layer was determined, and the microstructure and phase composition of the cladding layer were analyzed. The wear resistance of the substrate, the conventional cladding layer and the active cladding layer was studied by wear tests. Results The results showed that the microstructure of the cladding layer was changed, and the phases formed were increased after adding the active agent. Phase analysis showed that Mn2B, CrB2 and Co2B existed in the conventional cladding layer, whereas the active cladding layer contained not only Mn2 B, CrB2 and Co2 B, but also W3 CoB3 , Cr3 B4 , Cr3 C2 and Co2 SiO4 . In addition, the hardness of the active cladding layer was increased by 1. 13 times, and the wear resistance, adhesive wear and erosion resistance were improved by 1. 57, 1. 37 and 1. 49 times as compared with the conventional cladding layer. Conclusion After adding the active agent SiO2 in the coating layer, a better bonding between the cladding layer and the substrate was obtained, and the microstructure of the cladding layer was refined and became more uniform, moreover, the hardness and wear resistance of the coating were both improved. |
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