32Cr2MoV钢表面电泳沉积氧化铝和氧化锆涂层

Electrophoretic Deposition of Alumina and Zirconia Coating on the Surface of 32Cr2MoV Steel

采用电泳沉积法以硝酸铝和硝酸钇为溶胶原料,在溶胶制备过程中加入钇稳氧化锆(YSZ),然后利用电泳沉积和热压滤烧结相结合方法在32Cr2MoV钢表面制备氧化铝和氧化锆涂层。用扫描电子显微镜(SEM)对涂层表面及界面形貌进行观察,利用X射线衍射仪(XRD)对涂层物相组成进行分析,采用热循环氧化试验研究涂层对基体在900℃空气中高温氧化行为的影响。结果表明,利用电泳沉积法在32Cr2MoV钢表面制备了一层致密陶瓷涂层,经热压滤烧结后涂层由表层α-Al2O3和ZrO2、次表层Fe的氧化物以及靠近基体的Fe、Mo、Cr氧化物层组成,经900℃热循环氧化试验表明,陶瓷复合涂层对基体32Cr2MoV钢起到了一定的抗氧化保护作用。

Aluminum nitrate and yttrium nitrate as raw materials for electrophoretic deposition,Yttrium stabilized zirconia（YSZ） was added during preparation of sol-gel,and the composite coating with alumina and zirconia was prepared using electrophoretic deposition and hot-press techniques on the surface of 32Cr2MoV steel.Scanning electron microscopy（SEM） was used to exam the coating and interface morphology.The phase of composite coating was characterized by X-ray diffraction.The influence of composite coating on the substrate at a temperature of 900 ℃ in air was analyzed using thermal cyclic oxidation.Results show that a compact coating on 32Cr2MoV steel can be obtained by electrophoretic deposition and hot-press techniques.The composite coating is mainly composed of outer α-Al2O3 and ZrO2,middle iron oxides coating and inner iron molybdenum chromium oxides coating that protect the substrate not to be oxidized by thermal cyclic oxidation at 900 ℃ so quickly compared with steel without any coating.