铁基金属与陶瓷复合材料组织与性能的研究

The Study of the Micrcostructure and Properties of Iron-baswd Metal and Ceramic Compcoite Material

采用表面浸渗复合技术，通过常规铸造方法在铸铁表面获得ＳｉＯ２陶瓷颗粒增强的金属陶瓷复合层，并用于工业钢锭模的表面强化。在此基础上采用扫描电镜，图像分析仪和微区ｘ射线衍射研究了金属陶瓷复合层的组织性能和界面结构。结果表明，采用表面浸渗复合方法在金属表面可获得２～５ｍｍ厚的金属陶瓷复合层。复合层中陶瓷颗粒均匀分布，金属由基体连续过渡到表面。铸铁基体与ＳｉＯ２之间存在明显的界面反应，二者的结合为反应结合。采用金属陶瓷表面复合强化的钢锭模，其使用寿命比普通钢锭模提高近１倍，且钢锭模内表面抗氧化和龟裂性能明显提高。

In the present paper,a new surface infiltrating composite method was employedto obtain metal and ceramic composite layer on the surface of metal by the traditional castingtechnique. The microstructure, properties and interface feature of the composite layer were studiedby SEM, image processing system and microzone x-ray diffraction It was found that a compositelayer with the thickness of 2～5 mm can be obtained on the surface of cast iron by the surfaceinfiltration composite method.In the composite layer,SiO2 particulates distribute uniformly and themetal distributes continuously from the matrix to surface. Evident interface reactions exist betweenthe cast iron matrix and SiO2 ceramic,Because of the high heat and oxidation resistance of ceramic,the oxidation resistance and fracture resistance are evidently increased,The application of thetechnique to the composite mold shows that the service life of the metal-ceramic mold is about 1 timehigher than that of tlie traditlonal mold.