Abstract: Aiming at mitigating the high-temperature oxidation of titanium alloy which causes mechanical properties deterioration and lifetime reduction, a gradient composite coating composed of gradient alumina (ZrO2+Al2O3) and Al2O3 via a sol-gel me-thod (with the advantage of ease of composition control) on the surface of TC11 titanium alloy. Experiment were carried out among gradient coating,Al2O3 coating and matrix,and an oxidation rate of 0.015 mg2/ (cm4·h) and an oxidation index of 2.137 for the gradient coating were obtained from the fitting results of weight gain data after 700 ℃-100 h oxidation. It can be concluded that the high-temperature oxidation resistance of the gradient coating is better than the others taking into account weight gain curve and EDS analysis upon the oxidized samples. Thermal shock test at 700 ℃ confirms the better match of thermal expansion coefficient between matrix and Al2O3 outer layer for gradient coating (ZrO2+Al2O3), inferring the mitigation effect due to the chemical composition gradient to the mismatch which further benefits the promotion of resistance toward high-temperature oxidation and lifetime prolongation of titanium alloy matrix.
1 Filip R, Kubiak K, Ziaja W, et al. The effect of microstructure on the mechanical properties of two-phase titanium alloys[J]. J Mater Processing Technol,2003,133(1):84. 2 Zong Y Y, Shan D B, Xu M, et al. Flow softening and microstructural evolution of TC11 titanium alloy during hot deformation[J]. J Mater Processing Technol,2009,209(4):1988. 3 Wei D B, Zhang P Z, Yao Z J, et al. Oxidation of double-glow plasma chromising coating on TC4 titanium alloys[J]. Corrosion Sci,2013,66:43. 4 Nolan D, Huang S W, Leskovsek V, et al. Sliding wear of titanium nitride thin films deposited on Ti-6Al-4V alloy by PVD and plasma nitriding processes[J]. Surf Coat Technol,2006,200(20):5698. 5 Liu S F. Low temperature plasma enhanced CVD ceramic coating process for metal, alloy and ceramic materials: US Pat 6,482,476[P].2002-11-19. 6 Zheludkevich M L, Salvado I M, Ferreira M G S. Sol-gel coatings for corrosion protection of metals[J]. J Mater Chem,2005,15(48):5099. 7 Zhang K, He Y D, Kong X H, et al. Al2O3-ZrO2-Y2O3 composite coatings prepared by thermal pressure filtration of sol-gel paints[J]. Trans Mater Heat Treatment,2007,28(6):94(in Chinese). 张鲲, 何业东, 孔祥华, 等. 溶胶-凝胶复合料浆热压滤法制备Al2O3-ZrO2-Y2O3复合涂层[J]. 材料热处理学报,2007,28(6):94. 8 Tian X, Jia Q, Cui Y Y, et al. Preparation and high-temperature anti-oxidation property of protection coatings on γ-TiAl alloys by composite sol-gel method[J]. Chinese J Nonferrous Metals,2010,20(1):s264(in Chinese). 田晓, 贾清, 崔玉友, 等. 复合溶胶-凝胶法制备TiAl合金表面防护涂层及其高温抗氧化性能[J]. 中国有色金属学报,2010,20(1):s264. 9 Li H Q, Gong J, Sun C. High temperature oxidation resistance and mechanical properties coatings of NiCrAlY/Al-Al2O3 coatings on an orthorhombic Ti2AlNb alloy[J]. Acta Matall Sinica,2012, 48(5):579(in Chinese). 李海庆, 宫骏, 孙超. NiCrAlY/Al-Al2O3/Ti2AlNb 高温抗氧化和力学性能研究[J]. 金属学报,2012,48(5):579. 10 Brandl W, Grabke H J, Toma D, et al. The oxidation behaviour of sprayed MCrAlY coatings[J]. Surf Coat Technol,1996,86:41. 11 Zhang X, Zhou K, Wei X, et al. In situ synthesis of α-alumina layer at top yttrium-stabilized zirconia thermal barrier coatings for oxygen barrier[J]. Ceram Int,2014,40(8):12703. 12 Song R, Wang K P, Hu P, et al. Present situation of anti-oxidation coatings preparation on molybdenum and its alloys[J]. Mater Rev:Rev,2016,30(5):69(in Chinese). 宋瑞, 王快社, 胡平, 等. 钼及钼合金表面高温抗氧化涂层研究现状[J]. 材料导报:综述篇,2016,30(5):69. 13 Tang Z L, Wang F H, Wang Q J, et al. Effect of coatings on oxidation resistance and mechanical properities of Ti60 alloy[J].Acta Matall Sinica,1998,34(3):325(in Chinese). 唐兆麟, 王福会, 王清江, 等. 涂层对 Ti60 合金高温氧化性能及力学性能的影响[J]. 金属学报,1998,34(3):325. 14 Gurrappa I, Gogia A K. High performance coatings for titanium alloys to protect against oxidation[J]. Surf Coat Technol,2001,139(2):216. 15 Chen M, Li W, Shen M, et al. Glass-ceramic coatings on titanium alloys for high temperature oxidation protection: Oxidation kinetics and microstructure[J]. Corrosion Sci,2013,74:178. 16 Zhang F B, Zhu J C. Preparation of Al2O3-ZrO2 composite slurry for coating[J]. Surf Technol,2010(1):97(in Chinese). 张法碧, 朱景川. 涂层用Al2O3-ZrO2复合浆料的制备[J]. 表面技术,2010(1):97. 17 Tian X L, Xue Q H, Xue C B, et al. Alumina-zirconia composite powder prepared by sol-gel process[J]. J Chinese Ceram Soc,2012,40(6):866(in Chinese). 田晓利, 薛群虎, 薛崇勃. 溶胶-凝胶法制备氧化铝-氧化锆复合粉体[J]. 硅酸盐学报,2012,40(6):866. 18 Ren B T. High-temperature protective coatings prepared by sol-gel method on titanium alloys[D]. Shenyang: Northeastern University,2012(in Chinese). 任保轶. 钛合金表面溶胶-凝胶法制备高温防护涂层研究[D]. 沈阳: 东北大学,2012.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2017, Vol. 31 
