(1. 廣州有色金屬研究院 表面材料中心，廣州 510650；
2. 廣東工業(yè)大學 材料與能源學院，廣州 510081)
摘 要: 采用低壓等離子噴涂技術(shù)在鎳基單晶高溫合金上制備NiCoCrAlYTa涂層，研究涂層在900、1 000和1 100 ℃下恒溫氧化200 h的氧化動力學規(guī)律。通過表面XRD和SEM分析，初步探討了氧化動力學規(guī)律與氧化產(chǎn)物的關(guān)系。結(jié)果表明：900 ℃時NiCoCrAlYTa涂層的氧化曲線符合對數(shù)規(guī)律，氧化產(chǎn)物主要為θ-Al2O3相；1 000 ℃時NiCoCrAlYTa涂層的氧化曲線符合拋物線規(guī)律，氧化產(chǎn)物主要是θ-Al2O3和α-Al2O3相的混合物；1 100 ℃時NiCoCrAlYTa涂層的氧化符合立方規(guī)律，氧化產(chǎn)物主要是α-Al2O3相。根據(jù)實驗結(jié)果經(jīng)計算得到NiCoCrAlYTa涂層氧化過程中θ-Al2O3的形成激活能為151.78 kJ/mol，α-Al2O3的形成激活能為270.25 kJ/mol。
關(guān)鍵字: NiCoCrAlYTa涂層；低壓等離子噴涂；氧化動力學
low pressure plasma spraying
（1. Material Surface Center, Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510651, China;
2. College of Materials and Energy, Guangdong University of Technology, Guangzhou 510081, China）
Abstract: The NiCoCrAlYTa coating was prepared on Ni-based single crystal super-alloys by low pressure plasma spraying (LPPS). Oxidation kinetics of the coating oxidated for 200 h at three different temperatures was investigated. The results show that the oxidation behaviour of NiCoCrAlYTa coating conforms to different dynamical rules including the logarithmic equation, the parabola equation and the cubical equation at 900, 1 000 and 1 100 ℃, respectively. During the process of oxidation, θ-Al2O3 forms at 900 ℃. Both θ-Al2O3 and α-Al2O3 forms at 1 000 ℃, and α-Al2O3 forms at 1 100 ℃. The activation energies of θ-Al2O3 and α-Al2O3 are 151.78 and 270.25 kJ/mol, respectively.
Key words: NiCoCrAlYTa coating; low pressure plasma spraying; oxidation kinetics
