涂层结构对梯度涂层温度与应力分布的影响

Influence on Gradient Coating Temperature and Stress Distribution of Coating Structure

采用多层平板模型,利用有限元分析软件计算了不同涂层结构下梯度涂层高炉风口的温度场与应力场,并分析了涂层结构对梯度涂层内部温度分布与应力分布的影响。结果表明,涂层结构变化可以影响涂层内温度与应力的大小及转折点的位置。试验中设计的梯度涂层具有良好的隔热性能,且涂层内应力变化缓慢。当底层、中间层及面层厚度比为1∶1∶3时,涂层隔热效果最好,隔热温度达77℃;底层、中间层及面层厚度比为1∶2∶2时,涂层最大等效应力最小,其值为1.52E+9Pa。

The temperature and stress field of gradient coating blast furnace tuyere with different coating structures were computed using finite element analysis software based on multi-layer plate model, as well as the effect on gradient coating temperature and stress distribution of coating structure were analyzed. The results show that changing coating structure may influence magnitude of gradient coating temperature and stress and position of turning point. In this experiment, all designed gradient coatings have good heat-insulating property, and stress change little in coating. The coating structure with better heat-insula- ting effect has been obtained at the thickness ratio of bottom layer, middle layer and surface layer is 1 ： 1 ： 3. The maximal equivalent stress of coating has minimum at the thickness ratio of bottom layer, middle layer and surface layer is 1： 2： 2, which is 1.52E ＋9Pa.