金属基体高温耐磨复合涂层的制备与磨损性能研究

Preparation and Abrasion Performance Study of High-Temperature and Wear-Resisting Metal Substrate Compound Coatings

锅炉受热面金属管壁的磨损问题是困扰电厂安全运行的一大难题。实验采用改性无机粘结剂,以耐磨性优良的SiC、Al2O3颗粒为基本骨料,辅以少量Cr2O3颗粒,再添加少量的膨润土和无机纤维为增强材料,提高涂层和基体间的结合力。在500℃下固化后得到实验涂层。分别在冲蚀角15°、25°、35°、45°、60°下研究了涂层耐冲蚀磨损特性。实验发现:不同粒径的SiC-Al2O3复合涂层结合紧密,比单一组分涂层耐磨性好。当粗SiC的质量分数为45%时,涂层耐磨损性能最好;在冲蚀角为45°时,涂层的磨损量最大。

The heating surface wear of boiler metal wall is a difficult problem troubling power plant safe operation.By using modified inorganic silicon sol as bond,wearability excellent SiC,Al2O3 particles as the basic aggregate assisted by a few Cr2O3 grain,adding a small amount of bentonite and inorganic fibers for reinforced materials,the adhesion between coatings and substrate are improved.The experimental coatings were obtained after curing at 500 ℃.In regerd to blunt angle of 15°,25°,45°,35°,60°,respectively,the corrosion-proof and wear resislance of the coatings are studied.Experiments have found： the abrasion resistance of SiC-Al2O3 composite coatings with different particle sizes behave wear-resistance better than that with singre particle size.When the mass fraction of coarse SiC is 45%,the wear resistance is the best;In the erosion angle 45°,the coatings wear are the most.