材料期刊网

采用重力分离SHS制备了钢管内衬Al2O3涂层，进行了力学、抗热震、耐蚀等性能测试，研究了管径、装料密度及不同含量SiO2、CrO3添加剂对涂层组织与性能的影响。研究结果表明，涂层主要物相结构为a—Al2O3＋Fe Al2O3相，添加剂SiOz和CrO3不改变涂层的主要相组成。反应过程中熔融金属Fe在钢管基体和内衬陶瓷层之间形成了一层金属过渡层。当添加29／6 SiO2＋6％CrO2时，涂层孔隙率最小，硬度最大，抗热震性能最好，耐蚀性也较好，具有良好的综合性能。实验条件下，管径25cm、装料密度1．5g／cm3的内衬涂层硬度为1917HV，孔隙率为9．0％。

The AlcOa coating of steel pipes inwall was produced by SHS- gravitational process, it was tested of mechanical properties and thermal shock resistance as well as corrosion resistance. The effects of pipe diameter and stuffing density as well as different content of SiO2 and CrO3 additive on structure and properties of the pipes have been investigatied. It was found that the main phase of coating was α-Al2O3 q-FeAl2O4 and the SiO2 or CrO3 additives don＇t change the main phase composition. Molten metal Fe formed a transition layer between the steel pipe and ceramic layer during the reacting. When the additives content was 2% SiO2 ＋ 6% CrO3, the ceramic coating has smallest porosity and highest hardness as well as best thermal shock resistance, its corro- sion resistance was also good, so it shows good comprehensive performance. In this test conditions, when the diameter is 25cm and the stuffing density was 1.5g/cm3 , the hardness of coating can reach 1917HV, its porosity