CAJ | 학술논문

先采用电沉积?电泳方法在 Ni 基体高温合金上制备电镀 Ni/电泳Fe2O3复合涂层，再通过后续空气中进行的高温预氧化处理方法来获得NiO/NiFe2O4复合氧化物涂层。利用DSC、SEM、EDS和XRD等检测手段分析预氧化温度对涂层的结构、微观形貌、元素分布及相组成等影响，并对涂层形成的反应机理及预氧化动力学进行讨论。结果表明：经1000、1100和1200℃下氧化4 h后，氧化膜中均生成NiO和NiFe2O4。氧化温度为1000℃时涂层表面还存在没有参与反应的Fe2O3，但随氧化温度的升高，Fe2O3层随之消失。温度为1100和1200℃时氧化膜中的NiO、NiFe2O4相与镀Ni基体之间形成了冶金结合，并且通过扩散在NiO相内部形成了NiFe2O4析出相。Ni基体以及电镀Ni/电泳Fe2O3复合涂层在1000℃预氧化时单位面积上的质量增加随时间增加，大体遵循抛物线规律，且电镀Ni/电泳Fe2O3复合涂层单位面积上的质量增加大于镀Ni基体的。涂层的厚度与氧化质量增加随预氧化扩散温度的提高而增加。
선채용전침적?전영방법재 Ni 기체고온합금상제비전도 Ni/전영Fe2O3복합도층，재통과후속공기중진행적고온예양화처리방법래획득NiO/NiFe2O4복합양화물도층。이용DSC、SEM、EDS화XRD등검측수단분석예양화온도대도층적결구、미관형모、원소분포급상조성등영향，병대도층형성적반응궤리급예양화동역학진행토론。결과표명：경1000、1100화1200℃하양화4 h후，양화막중균생성NiO화NiFe2O4。양화온도위1000℃시도층표면환존재몰유삼여반응적Fe2O3，단수양화온도적승고，Fe2O3층수지소실。온도위1100화1200℃시양화막중적NiO、NiFe2O4상여도Ni기체지간형성료야금결합，병차통과확산재NiO상내부형성료NiFe2O4석출상。Ni기체이급전도Ni/전영Fe2O3복합도층재1000℃예양화시단위면적상적질량증가수시간증가，대체준순포물선규률，차전도Ni/전영Fe2O3복합도층단위면적상적질량증가대우도Ni기체적。도층적후도여양화질량증가수예양화확산온도적제고이증가。
@@@@Electrodeposition-electrophoretic deposition (EPD) technique was employed for fabricating the ferric oxide (Fe2O3) thick films on the Ni-based superalloy, and then pre-oxidation processing method was used to obtain the NiO/NiFe2O4 composite coating. DSC, SEM, EDS and XRD analysis methods were used to analyze the influence of pre-oxidation temperature on the coating structure, morphology, elemental distribution and composition of the phase, and forming reaction mechanism and kinetics of the coating were also discussed. The results show that by high temperature diffusion processes at 1 000, 1 100 and 1 200℃for 4 h, respectively, the oxide film is made up of NiO and NiFe2O4. When the oxidation temperature is 1 000 ℃, there is no reactive Fe2O3 layer on the surface of coating, while with the oxidation temperature increasing, Fe2O3 layer disappears. When the temperature increases to 1 100 and 1 200℃, the NiO, NiFe2O4 phase and the Ni plating reach metallurgical combination, and NiFe2O4 spinel precipitates and forms inside NiO matrix phase through diffusion transport. The per unit area mass gain of Ni substrate and electrophoretic Ni/EPD Fe2O3 coating after 1 000℃pre-oxidation diffusion treatment increases with the increase of time, which generally follows the parabolic law, and the per unit area mass gain of Ni/EPD Fe2O3 increases faster than that of the electroplated Ni. The thickness and mass gain of oxide coating obviously increase with the pre-oxidation the increase of temperature.