材料期刊网

以钼粉、FeB粉、铁粉和铝粉为原料，用含聚乙烯醇缩丁醛的乙醇溶液作为粘结剂，混合后在900。C真空热处理2h，破碎后得到热喷涂喂料；采用反应火焰热喷涂技术在Q235钢表面制备金属陶瓷涂层，并将涂层在1000℃真空热处理5h；采用X射线衍射仪和扫描电子显微镜分析了涂层的物相组成和显微结构，并对涂层的抗热震性、耐磨性和耐腐蚀性进行了测试。结果表明：900℃真空热处理后，粉体中有M02FeB2和Fe3Al生成；涂层由硬质相（M02FeB2、Fe3Al）和铁基粘结相及氧化物（Al2O3、B2O3、MoO3）等组成；未经热处理的涂层抗热震次数为35次，耐磨性为基体的4．04倍，在质量分数为59／6H2SO4中的耐腐蚀性比基体的提高了4．02倍；热处理之后涂层的抗热震次数为55次，耐磨性为基体的7．36倍，耐腐蚀性为基体的6．13倍。

The powders for reactive thermal spraying （RTS） were synthesized by heat treatment at 900 ℃ for 2 h and crushed using Mo powders, FeB powders, Fe powders and A1 powders as raw materials and PUB solution as binder. Cermet coatings were prepared by RTS on Q235 steel surface and heat treated at 1 000℃ under vacuum for 5 h. Microstructure and phases were investigated by XRD and SEM. The thermal shock resistance, wear resistance and corrosion resistance were tested. The results indicate that Moz FeB2 and Fe3 A1 were generated in sinter-crushing powders after treated at 900 ~C. The coatings were composed of the hard phases o[ Mo2 FeBz, Fe3 A1 and Fe-base hinder phase, as well as oxides of A1203, t~Os and MOO3. The thermal-shock times of the coatings without heat- treatment were 35, the wear resistance was 4.04 times higher than that of the substrate, the corrosion resistance in 4 wt% H2SO4 solution was 4. 02 times higher. The thermal-shock times of the coatings were 55, the wear resistance and corrosion resistance were 7. 36 and 6.13 times higher than those of the substrate after heat-treatment.