为了提高TiAl基合金的抗高温氧化性能,采用热浸镀铝法和热扩散处理工艺在合金Ti-45Al-2Cr-2Nb-0.15B(原子分数,%)表面制备TiAl_3涂层.用XRD和SEM方法对涂层的结构和成分进行了分析.结果表明:TiAl合金经过热浸镀铝处理,表面生成了双相的富Al涂层,它由纯Al外层和TiAl_3内层组成;在550℃下,无论是在真空或者空气气氛中,进行扩散热处理,TiAl合金表面都形成了单相的TiAl_3涂层.
TiAl_3 coating was prepared on the surface of Ti-45Al-2Cr-2Nb-0.15B(at.%)alloy so as to improve the oxidation resistance at high temperature.The microstructure and composition of the aluminizing coating were analyzed by means of X-ray diffraction and scanning electron microscopy.And the effect of thermal diffusion treatment on the composition and oxidation resistance of the coating at elevated temperature was investigated.Results indicate that the hot-dip aluminizing coating on the surface of the alloy consists of Al-rich dual-phases,i.e.,an outer Al layer and an inner TiAl_3 layer.After being thermally diffused at 550℃ in either vacuum or air,a single-phase TiAl3 coating was obtained contributing to the improved oxidation resistance of the alloy at elevated temperature.
参考文献
| [1] | Yang MR.;Wu SK. .Oxidation resistance improvement of Ti-50Al intermetallics by pre-oxidizing and subsequent polishing[J].Materials Chemistry and Physics,2000(2):144-149. |
| [2] | Garbacz H.;Lewandowska M. .Microstructural changes during oxidation of titanium alloys[J].Materials Chemistry and Physics,2003(2/3):542-547. |
| [3] | Gauthier V;Dettenwanger F;Schutze M et al.OxidationResistant Aluminide Coatings on γ-TiAl[J].Oxidation of Metals,2003,59(3,4):233-255. |
| [4] | Taniguchi S;Tachikawa Y;Shibata T .Influence of Oxygen Partial Pressure on the Oxidation Behaviour of TiAl at 1 300 K[J].Materials Science and Engineering,1997,A232(1,2):47-54. |
| [5] | Mu-Rong Yang;S. K. Wu .The improvement of high-temperature oxidation of Ti-50Al by anodic coating in the phosphoric acid[J].Acta materialia,2002(4):691-701. |
| [6] | Chu M S;Wu S K .Oxidation Behavior of Ti-50Al Intermetallies with Thin TiAl_3 Film at 1 000℃[J].Oxidation of Metals,2005,63(1,2):1-13. |
| [7] | M.S. Chu;S.K. Wu .The improvement of high temperature oxidation of Ti-50Al by sputtering Al film and subsequent Interdiffusion treatment[J].Acta materialia,2003(11):3109-3120. |
| [8] | Tang Z L;Wang F H;Wu W T .Effect of a sputtered TiAl-Cr coating on the oxidation resistance of TiAl intermetallic compound[J].Oxidation of Metals,1997,48(5,6):511-525. |
| [9] | Nishimoto T;Izumi T;Hayashi S et al.Effect of coating layer structures and surface treatments on the oxidation behavior of a Ti-50at%Al alloy[J].Intermetallics,2003,11(05):459-466. |
| [10] | Zhaolin Tang;Fuhui Wang;Weitao Wu .The effects of several coatings on cyclic oxidation resistance of TiAl intermetallics[J].Surface & Coatings Technology,1998(1/2):57-61. |
| [11] | Tang ZL.;Wu WT.;Wang FH. .Effect of MCrAlY overlay coatings on oxidation resistance of TiAl intermetallics[J].Surface & Coatings Technology,1998(3):248-252. |
| [12] | C. Leyens;J. -W. van Liere;M. Peters;W. A. Kaysser .Magnetron-sputtered Ti-Cr-Al coatings for oxidation protection of titanium alloys[J].Surface & Coatings Technology,1998(1/3):30-35. |
| [13] | Ueda M.;Susukida D.;Konda S.;Ohtsuka T. .Improvement of resistance of TiAl alloy against high temperature oxidation by electroplating in AlCl3-NaCl-KCl-CrCl2 molten salt[J].Surface & Coatings Technology,2004(2):202-208. |
| [14] | Shibli SMA;Manu R;Dilimon VS .Effect of nickel-rich barrier layer on improvement of hot-dip zinc coating[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2005(1/4):179-185. |
| [15] | T. Novoselova;S. Malinov;W. Sha .Experimental study of the effects of heat treatment on microstructure and grain size of a gamma TiAl alloy[J].Intermetallics,2003(5):491-499. |
| [16] | Jung J Y;Park J K .Influence of elemental B addition on the heat-treated cast structures of Ti-47Al-2Cr-(2-4)Nb alloys[J].Journal of Materials Research,1997,12(03):665-680. |
| [17] | T. Novoselova;S. Malinov;W. Sha;A. Zhecheva .High-temperature synchrotron X-ray diffraction study of phases in a gamma TiAl alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(1/2):103-112. |
| [18] | Hyrnan M E;McCullough C;Levi C G et al.Evolution of boride morphologies in TiAl-B alloys[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1991,22(07):1647-1662. |
| [19] | D. Hu .Effect of composition on grain refinement in TiAl-based alloys[J].Intermetallics,2001(12):1037-1043. |
| [20] | 董利民,崔玉友,杨锐.B和C对铸造TiAl基合金宏观和显微组织的影响[J].金属学报,2002(06):643-646. |
| [21] | Massalski T B.Binary Alloys Phase Diagrams[M].Ohio,USA:the Materials Information Society,1996 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%