火焰喷涂热障陶瓷基复合涂层的新方法

NEW PROCESS OF FLAM SPRAYING FOR CERAMIC—BASED COMPOSITE COATING WITH HEAT RESISTANCE

介绍了用氧乙炔火焰在铜材表面喷涂Al_2O_3基复合耐热涂层的新方法——倾斜过渡和重熔。用电镜对涂层的显微结构进行了研究,着重分析了火焰喷涂陶瓷基复合涂层的扩散反应和液相烧结,以及晶粒细小等特征。还讨论了这些显微结构特征对涂层结合强度、耐热和抗热震性能等的影响。采用本工艺配方,对炼铁高炉渣口进行喷涂后,其使用寿命提高2倍以上。

A new process, slope transition and remelting used for spraying Al_2O_3 composite heat resistant layer on the surface of copper materials with oxyacetylene flam has been introduced. The microstructure of coating layer has been studied by using SEM. Particular attentions have been paid to diffusing reaction, liquid sintering, fine grains and other features. The effects of microstructural features on the bonding strength of coating layer, heat resistance, spalling resistance, etc have also been discussed. The Servia Life of the slag hole of blast furnace by using this Spraying technology and composition has increased by 2 times.