论文部分内容阅读
以Al-10wt%SiO2粉末为研究体系,对比机械混合与球磨的粉末,研究了球磨粉末的相组成和微结构,用差热分析的方法确定了两种粉末体系中的置换反应发生的温度,以此为据,优化了烧结两种粉末压坯的工艺。结果表明,4h球磨的粉末颗粒明显细化,部分SiO2颗粒嵌入Al基体,形成反应扩散耦Al/SiO2;混合粉末中置换反应不能发生,球磨粉末中置换反应的温度区间为560-680℃;球磨粉末的压坯在640℃烧结2h,可形成组织均匀的微米级Al2O3颗粒强化Al基复合材料。
Taking Al-10wt% SiO2 powder as the research system, the phase composition and microstructure of the milling powders were compared with the mechanical mixing and ball milling powders. The temperature of the displacement reaction in the two powder systems was determined by the method of differential thermal analysis. Based on this, the process of sintering two powder compacts is optimized. The results show that the powder particles of 4h ball milling are obviously refined. Part of SiO2 particles are embedded in the Al matrix to form Al / SiO2 reaction diffusion reaction. The displacement reaction can not occur in the mixed powder. The temperature range of displacement reaction in ball milling powder is 560-680 ℃. Powder compact at 640 ℃ for 2h, the formation of uniform microstructure of Al2O3 particles reinforced Al matrix composites.