用浆料涂敷法在孔隙率较高的重结晶碳化硅电热元件表面制备MoSi2-Si3N4抗氧化涂层,分析了氧化前后涂层的形貌和物相组成,研究了涂层的抗氧化性.结果表明,用该法制备的涂层表面平整,结构致密.浆料在形成涂层的同时填充了大尺寸的开气孔,提高了基体的致密性,因此提高了基体的抗氧化性能.将试样在1500℃氧化性气氛中氧化100h后,无涂层试样的电阻率增大了84.6％,而MoSi2-Si3N4涂层试样的电阻率只增大10.2％.涂层处理后的电热元件,其抗氧化性显著提高.MoSi2-Si3N4复合涂层的抗氧化性能,明显优于单一的MoSi2涂层.
A MoSi2-Si3N4 anti-oxidation coating was prepared on the surface of recrystallized silicon carbide heating elements by a simple and low-cost slurry method.Oxidation test of the coating was conducted in oxidizing atmosphere at 1500℃ for 100 h.Results show that the coating is dense and smooth without penetrating pores or micro-cracks.During the course of coating forming,the slurry filled the open pores of large size on the surface of the heating element,thus increasing its density and improving its oxidation resistance.After oxidation test the electrical resistivity of uncoated heating element increases 84.6％,while the coated one increases only 10.2％.The oxidation resistance of heating element was significantly improved with the applied coating.Results of comparative experiments show that the oxidation resistance of MoSi2-Si3N4 muti-phase coating is better than that of the single MoSi2 coating.
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