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探讨了CeO2对碳硼共渗层组织及性能的影响,利用金相显微镜、扫描电镜、能谱仪、X射线衍射仪分析了共渗层的组织形貌、元素含量及分布、表面相组成,利用显微硬度计、摩擦磨损试验机测定了共渗层的硬度变化和摩擦磨损特性。结果表明,加入CeO2的硼化物层和增碳层均比未加入CeO2的硼化物层和增碳层厚,其硼化物层的厚度提高大约33%,而且厚度相对比较均匀。CeO2的加入使硼化物层的齿形更连续,致密性更好,使共渗层的显微硬度比未加入CeO2的显微硬度平均提高大约21%。CeO2的加入使共渗层与基体之间形成富碳过渡层,经淬火后形成了一层硬度较高且不易产生塑变的支撑层,有效地提高了共渗层的耐磨性,其耐磨性比未加入CeO2的耐磨性提高大约37%。
The effects of CeO2 on the microstructure and properties of the carburized boron carbides were investigated. The morphology, elemental content and distribution of the carburized layers were analyzed by metallographic microscope, Using micro-hardness tester, the friction and wear tester was used to measure the hardness change and the friction and wear properties of the co-layer. The results show that both the boride layer and the carbon layer added with CeO2 are thicker than the boride layer and carbon layer without CeO2 addition, the thickness of the boride layer is increased by about 33% and the thickness is relatively uniform. The addition of CeO2 makes the tooth profile of the boride layer more continuous and compact, increasing the microhardness of the co-permeable layer by about 21% on average compared with the microhardness without adding CeO2. The addition of CeO2 forms a carbon-rich transition layer between the co-diffusion layer and the substrate, and after quenching, a support layer with high hardness and no plastic deformation is formed, thereby effectively improving the wear resistance of the co-diffusion layer. Abrasion resistance is about 37% higher than that without CeO2.