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一九八二年,某钢厂要求我们帮助解决高炉吸风机阀座抗高温氧化问题,我们系统地了解阀座损坏的原因后,提出了用热喷涂耐热抗氧化涂层提高寿命。涂层设计等离子喷涂氧化物涂层通常具有较高的硬度值,且高温下比较稳定,是较为理想的高温抗氧化材料。氧化物涂层中最常用的是:Al_2O_3,ZrO_2及MgO粉末。其中以Al_2O_3粉末价格便宜(每公斤4元),来源方便,机械强度高,化学稳定性好。因此选用了Al_2O_3粉末。但Al_2O_3粉末在高温下可能出现相转变。伴随相变,体积发生变化,会导致涂层裂纹,
In 1982, a steel mill asked us to help solve the problem of high temperature oxidation of blast furnace suction valve seat. After systematically understanding the cause of the valve seat damage, we proposed that thermal spraying and heat-resistant anti-oxidation coating be used to increase the service life. Coating design Plasma sprayed oxide coating usually has a higher hardness value, and relatively stable at high temperatures, is the ideal high temperature oxidation resistant material. The most commonly used oxide coatings are: Al 2 O 3, ZrO 2 and MgO powders. Among them, the price of Al 2 O 3 powder is cheap (4 yuan per kilogram), convenient source, high mechanical strength and good chemical stability. So choose Al 2 O 3 powder. However, Al 2 O 3 powders may undergo phase transformation at high temperature. With the phase change, the volume changes, will lead to coating cracks,