Thermal Barrier Properties of Gradient Coating on a Ceramic Metal

In this paper,the adherence and thermal barrier properties of A12O3-based ceramic metal gradient coating with the method of oxyacetylene-flam-spray are studied. The results show that the physical and chemical compatibilities between the coating and the substrate are improved by adding Cu,Ni/Al and the gradient coating,and to relax thermal stress and interface stress in coat and at the same time to increase adherence property of coating. Besides,the gradient coating has good spalling resistance,erosion resistance to high temperature liquid iron and the effect of thermal barrier properties is remarkable.     

论化肥在现阶段山西农业发展中的作用

增施化肥,打破千百年来“有机农业” 的封闭式循环,是由传统农业过渡到现代农业的必备条件.山西省粮食产量与化肥施用量呈同步增长的关系,相关系数为0.9486.进一步发展山西农业生产,必须重视化肥投入,走以无机促有机、无机有机相结合的道路.本文对一些流行观点提出了不同看法.