| Dr. Yingqing Fu, Prof. Yang Gao and Zukun Hei, Electromechanics and Materials Engineering College, Dalian Maritime University, 1 LingHai Road, DaLian, 116026, China
The effect of substrate temperature during the low-power plasma spraying (2.5~8.0kW) and after annealing on the phase transformation of Al-Cu-Cr quasicrystalline coatings were investigated. Compared with the original powder mainly composed of icosahedral I-Al65Cu24Cr11 quasicrystalline phase and monoclinic θ-Al83Cu4Cr13, the coatings show an icosahedral quasicrystal I-Al65Cu24Cr11 and its body-centered cubic approximant α-Al69Cu18Cr13. XRD patterns indicated that for identical spraying condition, the rise of substrate temperature was accompanied by an increase of the I/α peak intensity ratio in the coatings, and the crystalline phases of AlCu4 and Al86Cr14 were observed in the coatings after annealing at 1113K for half an hour.
Key Words: Low-power plasma spray; Al-Cu-Cr quasicrystal; Phase transformation; Substrate temperature; Annealing; Coating |