| SUI Xin-meng,HU Ji,ZHANG Lin,ZHAO Wei,ZHANG Wei-ping.Research Progress of High Temperature Oxidation Resistance Coating on Titanium Alloy[J],49(10):21-38 |
| Research Progress of High Temperature Oxidation Resistance Coating on Titanium Alloy |
| Received:August 15, 2020 Revised:October 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.10.003 |
| KeyWord:titanium alloy nickel-based high-temperature coating TiAl-based high-temperature coating high-entropy alloy high-temperature coating oxidation performance oxidation mechanism |
| Author | Institution |
| SUI Xin-meng |
School of Materials Science and Engineering, Dalian University of Technology, Dalian , China |
| HU Ji |
School of Materials Science and Engineering, Dalian University of Technology, Dalian , China |
| ZHANG Lin |
School of Materials Science and Engineering, Dalian University of Technology, Dalian , China |
| ZHAO Wei |
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: |
| Titanium alloy has important application value in the manufacture of aerospace engines and other key components, but the unstable high-temperature performance is the main reason that restricts its development prospects. Laser cladding technology used to prepare high temperature resistant coatings on the surface of titanium alloy is an important way to give special properties to the surface of the material without changing the overall performance of the titanium alloy material. Firstly, the oxidation behavior of titanium alloy was introduced, and the oxidation characteristics and failure modes of titanium alloy in the oxidation process were briefly analyzed, and the ways for improvement were pointed out. Subsequently, the current research status of commonly used nickel-based high-temperature coatings, TiAl-based high-temperature coatings and high-entropy alloy high-temperature coatings were summarized and analyzed. Nickel-based alloy coatings had high bonding strength, good wear resistance and excellent corrosion resistance, but due to the difference between the diffusion rate of the elements in the coating and the substrate, the Kirkendall voids were generated, the coating became unstable, and the bonding strength between the coating and the substrate decreased. The high-temperature properties of TiAl-based alloys were similar to those of nickel-based superalloys, and the density was small, so it had a tendency to replace nickel-based alloys. A uniform and dense Al2O3 oxide film could be formed on the coating surface of TiAl-based alloys, with small chemical composition difference from the titanium alloy substrate, and there was basically no mutual diffusion phenomenon between the coating and the substrate. However, the binary TiAl coating had strict requirements on the amount of Al. When the service temperature exceeds 850 ℃, the oxidation resistance was seriously reduced. Therefore, the addition of X elements (such as Cr, Si, Ni, etc.) in Ti-Al-X coatings could appropriately reduce the Al content, promote the formation of uniform and compact Al2O3 oxide film and effectively prevent oxygen from diffusing into the substrate and the Ti-Al-X coatings had lower brittleness and better plasticity than binary TiAl coatings. The high-entropy alloy high-temperature coating had many excellent properties and adjusting the content of one or several elements could further optimize the performance, so the application prospects are extremely broad. is the coatings were still in the laboratory research stage, because he unreasonable ratio and the negative reaction of the matrix to the cladding layer made the brittleness and mechanical properties of the high-entropy alloy fail to reach the theoretical effect and enter the real application stage. Finally, the development trend of laser cladding technology for preparing high-temperature coatings on the surface of titanium alloys is prospected. |
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