H13钢表面放电等离子烧结制备三元硼化物基金属陶瓷覆层
Ternary Boride Based Cermet Prepared on H13 Steel Surface by Spark Plasma Sintering
周兴华, 华 林
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作者单位：武汉理工大学 材料科学与工程学院, 湖北 武汉 430070
中文关键字：H13钢； 三元硼化物； 金属陶瓷； 覆层材料； 放电等离子烧结
英文关键字：H13 steel; ternary boride; cermet; cladding material; spark plasma sintering (SPS)
中文摘要：以钼粉、铁粉、硼铁粉等为主要原料，采用放电等离子烧结技术在H13钢基体表面快速制备三元硼化物基金属陶瓷覆层，对烧结致密化过程进行了分析，并利用扫描电镜、X射线衍射仪、显微硬度计等分别观察了覆层和界面结合区的组织形貌，分析了覆层的物相组成，测试了微观硬度。结果表明，三元硼化物基金属陶瓷覆层内部组织结构致密，主要由Mo2FeB2硬质相和α-Fe粘结相组成，显微硬度达1400 HV，覆层与钢基体的结合处没有清晰的结合界面，而是存在一个具有一定厚度的过渡层。
英文摘要：The cladding of ternary boride based cermet taking Mo, Fe and ferro-boron powders as raw materials was prepared on H13 steel substrate surface by spark plasma sintering, and the densification process of sintering was analyzed. The microstructure of the cladding and bonding interface, the phase composition and the microhardness distribution were observed and analyzed respectively by SEM, XRD and microhardness instrument. The results show that, the main phase composition of the cladding of ternary boride based cermet is Mo2FeB2 hard phase and α-Fe bonding phase with compact microstructure, the microhardness is up to 1400 HV, and there is no distinct bonding interface between the cladding and steel substrate, but a transitional layer with certain thickness is formed.