重结晶碳化硅表面MoSi_2-Si_3N_4抗氧化涂层的制备和性能  

Preparation and Properties of MoSi_2-Si_3N_4 Anti-oxidation Coating for Recrystallized Silicon Carbide

作　　者：牛芳旭 王延相[1,2] 刘群[2] Imran Abbas 王成国[1,2] 

机构地区：[1]山东大学材料科学与工程学院材料液固结构演变与加工教育部重点实验室,济南250061 [2]山东大学材料科学与工程学院碳纤维工程技术研究中心,济南250061

出　　处：《材料研究学报》2017年第5期329-335,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51573087);山东省自然科学基金(ZR2014EZ001;ZR2011EMM002)~~

摘　　要：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MoSi_2-Si_3N_4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100 h后,无涂层试样的电阻率增大了84.6%,而MoSi_2-Si_3N_4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。MoSi_2-Si_3N_4复合涂层的抗氧化性能,明显优于单一的MoSi_2涂层。A MoSi2-Si3N, 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 con- ducted 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 oxi- dation 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 sig- nificantly improved with the applied coating. Results of comparative experiments show that the oxidation resistance of MoSi2-Si3N, muti-phase coating is better than that of the single MoSi2 coating.

关 键 词：无机非金属材料 抗氧化涂层 重结晶碳化硅 电热元件 MoSi2-Si3N4 

分 类 号：TB321[一般工业技术—材料科学与工程]