FeAl金属间化合物具有优良的物理性能和力学性能,但其室温塑性和断裂韧性低,限制了其工程应用.利用机械合金化制备了Fe(Al)固溶体合金粉末及Al2O3,WC硬质相增强的复合合金粉末,通过冷喷涂沉积涂层并结合后热处理原位反应制备了FeAl金属间化合物涂层及其复合涂层.利用扫描电镜(SEM)、X射线衍射仪(XRD)及显微硬度仪等研究了硬质相对球磨粉末组织结构、冷喷涂FeAl金属间化合物涂层组织结构及性能的影响.结果表明.硬质相可显著加速球磨粉末内部层状结构的细化程度,喷涂态涂层具有不同于传统热喷涂涂层的层状组织结构,热处理可实现喷涂态涂层中Fe(Al)固溶体向FeAl金属间化合物的原位转变,致使层状结构消失,获得无粒子界面的FeAl金属间化合物涂层,弥散分布的硬质相可显著提高冷喷涂FeAl金属间化合物涂层的强化稳定性.
FeAl intermetallic compounds had excellent physical and mechanical properties. However, their industrial applications were limited by low room temperature ductility and fracture toughness. Thus FeAl intermetallic compound coating and the same coatings reinforced with hard phases Al2 O3 and WC were in-situ prepared by cold spraying of mechanically alloyed Fe(Al) solid solution alloy powder, Fe(Al)/Al2O3 and Fe( Al)/WC composite powder and follow-up post- spraying heat treatment. The influence of hard phases Al2 O3 and WC on the microstructure, phase composition and microhardness of cold - sprayed FeAl - based composite coatings was investigated by means of scanning electron microscopy, X- ray diffraction and microhardness testing. Resuhs show that the hard phases can accelerate the microstructure refinement of ball - milled powder. The as - sprayed coatings exhibited the same composition and structure as those of ball - milled materials for spraying. Moreover, heat treatment resulted in the complete transformation from Fe ( Al) solid solution to FeAl intermetallic compound and enhanced interfacial bonding of deposited particles. The dispersed hard phases could significantly increase the microhardness of the cold - sprayed FeAl intermetallic compound coatings.
参考文献
| [1] | Liu CT.;Maziasz PJ.;Schneibel JH.;George EP. .Recent advances in B2 iron aluminide alloys: deformation, fracture and alloy design[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):84-98. |
| [2] | McKamey C G;De Van J H;Tortorelli P F et al.A review of recent development in Fe3Al-based alloys[J].Journal of Materials Research,1991,68:1779-1805. |
| [3] | Stoloff NS. .Iron aluminides: present status and future prospects[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):1-14. |
| [4] | Thierry Grosdidier;Gang Ji;Nathalie Bozzolo .Hardness, thermal stability and yttrium distribution in nanostructured deposits obtained by thermal spraying from milled-Y_2O_3 reinforced-or atomized FeAl powders[J].Intermetallics,2006(7):715-721. |
| [5] | Ji Gang;Jean-Paul Morniroli;Thierry Grosdidier .Nanostructures in thermal spray coatings[J].Scripta materialia,2003(12):1599-1604. |
| [6] | G. Ji;T. Grosdidier;H.L. Liao .Spray forming thick nanostructured and microstructured FeAl deposits[J].Intermetallics,2005(6):596-607. |
| [7] | 徐滨士,李长久.热喷涂技术的应用与发展[C].第八次全国焊接会议论文摘要集(第1册),1997:1-148～1-156. |
| [8] | 高荣发.热喷涂[M].北京:化学工业出版社,1992 |
| [9] | Dobler K;Kreye H;Schwetzke R .Oxidation of stainless steel in the hiigh velocity oxy-fuel process[J].Journal of Thermal Spray Technology,2000,9(03):407-413. |
| [10] | Toma D;Brandl W;Ko"ster U .Studies on the transient stage of oxidation of VPS and HVOF sprayed MCrAlY coatings[J].Surf CoatTechnol,1999,120-121:8-15. |
| [11] | 李文亚,李长久.冷喷涂特性[J].中国表面工程,2002(01):12-16. |
| [12] | Alkimov A P;Kosarev V F;Papyrin A N .A method of cold gas dynamic deposition[J].Doklady Akademii Nauk SSSR,1990,315(05):1062-1065. |
| [13] | Anatolii Papyrin .COLD SPRAY TECHNOLOGY[J].Advanced Materials & Processes,2001(9):49-51. |
| [14] | 李长久;杨冠军;王洪涛 .金属间化合物涂层的制备方法[P].中国,100017976.X,2007. |
| [15] | Wang H T;Li C J;Yang G J et al.Micmstmctural characterization of cold-sprayed nanestructured FeAl intermetallic compound coating and its ball-milled feedstock powders[J].Journal of Thermal Spray Technology,2007,16(5,6):669-676. |
| [16] | 王洪涛,杨冠军,李长久,鲍崇高.冷喷涂FeAl金属间化合物涂层的高温磨损性能研究[J].中国材料进展,2009(02):61-64. |
| [17] | A. Y. Mosbah;D. Wexler;A. Calka .Abrasive wear of WC-FeAl composites[J].Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear,2005(9):1337-1341. |
| [18] | Inoue M.;Suganuma K.;Niihara K.;Nagao H. .Fracture properties of Fe-40 at.% Al matrix composites reinforced with ceramic particles and fibers[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):298-305. |
| [19] | R.Subramanian;J.H.Schneibel .The ductile-brittle size transition of iron aluminide ligaments in an FeAl/TiC composite[J].Acta materialia,1998(13):4733-4741. |
| [20] | 尹衍升;施忠良;刘俊友.铁铝金属间化合物[M].上海:上海交通大学出版社,1996 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%