| YU Juan-juan,ZHANG Xiao-yu,MA Ling-ling,LI Han,ZOU Long-jiang,ZHANG Wei-ping.Microstructures and Properties of Laser Cladding Ti / Ni+Si3N4 / ZrO2 Composite Coatings on TA15 Titanium Alloys[J],45(4):105-109,174 |
| Microstructures and Properties of Laser Cladding Ti / Ni+Si3N4 / ZrO2 Composite Coatings on TA15 Titanium Alloys |
| Received:November 09, 2015 Revised:April 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.04.018 |
| KeyWord:laser cladding titanium alloys cladding layer toughness hardness wear resistance |
| Author | Institution |
| YU Juan-juan |
School of Materials Science and Engineering, Dalian University of Technology, Dalian , China |
| ZHANG Xiao-yu |
School of Materials Science and Engineering, Dalian University of Technology, Dalian , China |
| MA Ling-ling |
School of Materials Science and Engineering, Dalian University of Technology, Dalian , China |
| LI Han |
School of Materials Science and Engineering, Dalian University of Technology, Dalian , China |
| ZOU Long-jiang |
School of Materials Science and Engineering, Dalian University of Technology, Dalian , China |
| ZHANG Wei-ping |
School of Materials Science and Engineering, Dalian University of Technology, Dalian , China |
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| Abstract: |
| Objective To improve the hardness and wear resistance of the surface of titanium alloys. Methods Wear-resistant Ti5Si3-TiN reinforced TiNi-Ti2Ni intermetallic matrix composite coatings were prepared on TA15 titanium alloys by the laser cladding process using Ti/ Ni+Si3N4 / ZrO2 powder blends as the precursor materials. Microstructure and worn surface morphologies of the coating were analyzed by X-ray diffraction, scanning electron microscopy and energy dispersive spectrometer. The micro-hardness and wear resistance of the coating were evaluated by the hardness test and friction and wear test. Results The results indicated that the coating and the base had a good metallurgical bond. Ti5 Si3 , TiN dendrites and ZrO2 particles were evenly distributed in the coatings consisting of TiNi and Ti2 Ni dendrites. Besides, the ZrO2 could refine the microstructure of the coating and the TiN which was generated in situ bridging the cracks in the cladding layer had toughening effect to some extent. The microhardness of the substrate was distributed in the range of 835 ~ 1050 HV, which was 3 times as high as that of the cladding layer. The wear loss of the substrate was about 1 / 6 that of the cladding layer, and the main wear mechanisms were abrasive wear and adhesive wear . Conclusion The high hardness, wear-resistant ceramic phase and high toughness phase of the coating significantly improved the hardness and wear resistance of the surface of titanium alloy. |
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