摘 要：纳米结构 Al₂O₃、TiO₂、SiO₂、SiC 粉体经过合理的预处理，经制 浆并喷雾干燥，得到微米级粉体，然后将制备出的粉体进行 1 100 ℃ 烧结。 着重研究实验条件对粉体制备的影响，利用扫描电镜观测粉体 的形貌，通过 XRD 检测烧结前后物相的变化。 结果表明：在喂料制备 过程中发现，粉体的松装密度和搅拌时间是成两段线性关系，不同的 喷雾造粒温度对粉体形貌有重要的影响。在 250 ℃制得的粉体内部部 分中空、结合强度高、球形度好。 粉体经合适的温度烧结后，没有新物 相生成，是适合等离子喷涂的纳米喂料。 

关键词: 等离子喷涂；纳米结构；喂料

Abstract: Through the proper pretreatment， the nano-structured Al₂O₃、 TiO₂、SiO2、SiC powders were reconstituted to micron by slurry forming and spray drying. The reconstituted powder was sintered at 1 100 ℃. The influence of experimental conditions to prepare of powder ，The morphol ogy of powder was observed by SEM， and the change of phase befor and after sintered was analysed by XRD. The experimental results showed that the relationship of stirring time and free holding density retained two part linearity in the process of feedstock. The forming of powder was sig nificantly effected by the different spray drying temperature. Comparing with powder prepared at other temperatures ，the powders that were pre pared at 250℃ maintained hollow partly， high intensity and well spheric ity. The powder that was not new phase after sintered at suitable tempera ture possess nano-structure and adapt to plasme spraying .Keywords: plasme spraying； nano-structure； feedstock