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为了研制一种新型连铸结晶器材料,采用高效能超音速等离子喷涂技术在纯铜基体上制备了Cr2O3陶瓷涂层。使用X射线衍射、扫描电子显微镜、图形软件、彩色3D激光显微镜和显微硬度计对涂层进行了表征及分析,分别在450℃和600℃对涂层进行了热震试验。结果表明,涂层继承了起始粉末的物相,但是Cr2O3的结晶度有所差异;陶瓷涂层表面为良好熔化区和部分熔融颗粒组成的双态组织,涂层断口形貌为典型的片层状组织,涂层截面可见均匀分布的富铬带。涂层孔隙率为1.2%,表面粗糙度为4.763μm,Vickers显微硬度为1 628 MPa。试样在450℃和600℃分别经历了均值为127.4和58.6次热震循环后,其半球顶端出现大面积剥落,但圆柱主体部分完好,表明Cr2O3陶瓷涂层具备良好的抗热疲劳性能,超音速等离子喷涂适合于结晶器铜板表面涂层的制备。
In order to develop a new type of continuous casting mold material, Cr2O3 ceramic coating was prepared on pure copper substrate by high-performance supersonic plasma spraying technology. The coatings were characterized and analyzed by X-ray diffraction, scanning electron microscopy, scanning electron microscopy, color 3D laser microscope and microhardness tester. Thermal shock tests were performed on the coatings at 450 ℃ and 600 ℃ respectively. The results show that the coating inherits the phase of the starting powder, but the crystallinity of Cr2O3 is different. The surface of the ceramic coating is a bimodal structure composed of well-melting zone and partially melted particles. The fracture appearance of the coating is typical Layered structure, coating cross-section visible uniform distribution of chrome-rich zone. The coating has a porosity of 1.2%, a surface roughness of 4.763 μm, and a Vickers microhardness of 1 628 MPa. The samples at 450 ℃ and 600 ℃ respectively experienced an average of 127.4 and 58.6 thermal shock cycles, the top of the hemisphere spalling large area, but the main part of the cylinder intact, indicating that the Cr2O3 ceramic coating with good thermal fatigue resistance, super Sound Velocity Plasma Spray is suitable for the preparation of mold copper surface coating.