Microstructure and High Temperature Wear of the Thermal Barrier Coatings on TiAl Alloys
-
摘要: 利用EB-PVD技术在TiAl合金表面制备了扩散铝/YSZ热障涂层.采用SEM、EDS和XRD分析了涂层的微观组织及其相组成,并测试了显微硬度和耐磨性.结果表明:涂层表面YSZ层为致密柱状晶结构,由非平衡四方相t'-ZrO2组成;涂层结构由表及里依次为YSZ/Al2O3/TiAl3/TiAl2/TiAl;涂层的显微硬度和高温磨损性能显著提高,其高温磨损机理为轻微的犁削和严重的粘附转移,体积磨损率约为TiAl合金磨损率的1/10.Abstract: Al-diffusion/YSZ thermal barrier coatings (TBCs) were deposited on the TiAl alloy by electronic beam-physical vapor deposition (EB-PVD). The microstructure, chemical composition and phase constituent of the TBCs were analyzed by SEM, EDX and XRD. The microhardness and high temperature friction and wear behavior of the TBCs were measured. The results showed that the top YSZ coatings were composed of non-equilibrium tetragonal ZrO2, which had a dense columnar microstructure. The phase constituent of the cross-sectioned TBCs was YSZ/Al2O3/TiAl3/TiAl2/TiAl from top to inner. The microhardness and high temperature wear resistance of TBCs were much higher than that of the substrate. The wear mechanisms of the Al-diffusion/YSZ are mild ploughing and severe adhesion at elevated temperature. The wear rate of TBCs was about 1/10 of the bare TiAl alloys.
-
Keywords:
- TiAl alloy /
- EB-PVD /
- thermal barrier coating /
- wear and friction
-
[1] Li S J,Liu Z C,Lin J P,et al. The creep properties of high niobium containing TiAl alloy[J]. Rare Meml Materials and Engineering,2002,31(1):31-36(in Chinese).
[2] M Yamaguchi, H Inui, K Ito. High-temperature structural intermetallics[J]. Acta Mater,2000,48(1): 307-322.
[3] Appel,Wanger R. Microstructure and deformation of two-phase γ-Tianium aluminides[J]. Mater Sci Eng,1998,22(5):187-262.
[4] Liu Z M,Meng Y Q.Gao Q, et al. Plasma nitridation process of TiAl based allo[J]. Hot Working Technology, 2004,(6):27-28(in Chinese).
[5] Noda T,0kab M,lsobe S. Hard surface of TiAl intenmetallic compound by plasma carburization[J]. Materials Science and Engineenng,1996,A213:157-161.
[6] T Noda, M Okabe, S Isobe. Hard surfacing of TiAl intermetallic compound by plasma carburization[J]. Material Science and Engineering,1996,A213:157-161.
[7] Y Wang,Z Qian,X Y Li,et al.Sliding wear properties of TiAl alloys with/without TiN coatings[J]. Surface and Coatings Technology,1997,91:37-42.
[8] Xiu-Bo Liu, Hua-Ming Wang. Modification of tribology and high-temperature behavior of Ti-48Al-2Cr-2Nb intermetallic alloy by laser cladding[J]. Applied Surface Science, 2006, 252: 5 735-5 740.
[9] Liu X B, Wang H M. Study on wear and high-temperature oxidation properties of laser clad metallic silicide composite coatings on TiAl intermetallic alloy[J]. Chinese Journal of Lasers, 2005, 32(8): 1 143-1 149(in Chinese).
[10] Chen Y,Wang H M. Rapidly solidified MC carbide morphologies of a pulsed laser surface alloyed γ-TiAl intermetallic with carbon[J]. Scripta Materialia, 2004, 50(4): 507-510.
[11] Liu C S,Chen S Y, Shang L J, et al. Microstructure and property of laser gas nitriding on γ-TiAl Alloy[J]. Chinese Journal of Lasers, 2002,A29(3):277-280(in Chinese).
[12] Tian J, Wu X Q, Xie F Q. Effects of Al diffusion coatings on friction and wear properties of titanium aluminum alloy[J]. Tribology, 2010, 30(4):409-413(in Chinese).
[13] Li M H,Sun X F,Gong S K,et al. Studies of microstructure and phase of EB-PVD TBCs exposed to elevated temperatures[J].Journal of Chinese Society for Corrosion and Protection, 2002,22(2):105-109(in Chinese).
[14] Rakowski J M, Pettit F S, Meier G H,et al. Effect of nitrogen on the oxidation of γ-TiAl[J]. Scripta Metallurgica at Materialia, 1995, 33(6): 997-1 003.
计量
- 文章访问数:
- HTML全文浏览量:
- PDF下载量: