The study of NiAl-TiB_2 coatings prepared by electro-thermal explosion ultrahigh speed spraying technology
Surface & Coatings Technology
Hou, S.-X. ,Liu, Z.-D.,Liu, D.-Y.
NiAl-TiB_2 composite coatings with 0, 10 and 20wt.% TiB_2 were synthesized on the Ni-based superalloy substrate using electro-thermal explosion ultrahigh speed spraying technology. The microstructure analysis shows that the coatings consist of submicron grains. The bond between coatings and substrate is metallic cohesion. TiB_2 as a powerful reinforcement is doped in NiAl for increasing its hardness. The isothermal oxidation test is carried out for the composite coatings at 1100°C in air. The result shows that the oxidation resistance of NiAl coating is higher than that of NiAl-10TiB_2 and NiAl-20TiB_2 coatings. The phases of oxides on the coatings during the process at high temperature have been analyzed by X-ray diffraction. The results show that Al_2O_3 and Cr_2O_3 coexistence on surface of NiAl coating, while Al_2O_3, Cr_2O_3, TiO_2 and a small amount of NiO form on surface of NiAl-10TiB_2 and NiAl-20TiB_2 coatings after oxidation for 4h.
本站文章未经允许不得转载；如欲转载请注明出处，北京桑尧科技开发有限公司网址：http://www.sunspraying.com/
|
