CAJ | 학술논문

以Mo粉、FeB合金粉、Fe粉为原料,将混合粉末在900℃下真空热处理2h,破碎,过75 μm筛制备喷涂喂料；采用反应火焰喷涂技术在Q235钢表面制备Mo2FeB2金属陶瓷涂层.将反应热喷涂制备的涂层在真空炉中1 000℃下热处理5h,测试涂层的性能.结果表明:在室温球磨15h后粉体中有Fe2B生成,在900℃下烧结后破碎的喷涂粉末中有部分三元硼化物(Mo2FeB2)生成:涂层由占主体的Mo2FeB2和α-Fe相和少量Fe2O3、FeO相及气孔组成.在涂层和基体的结合面处,存在由高硬度涂层到低硬度钢基体的过渡区；涂层和基体的结合强度为32.73 MPa,抗热震次数可以达到43次左右,耐磨性比钢基体提高5.28倍；涂层经过1 000℃真空扩散热处理后,具有更加优异的力学性能.
이Mo분、FeB합금분、Fe분위원료,장혼합분말재900℃하진공열처리2h,파쇄,과75 μm사제비분도위료；채용반응화염분도기술재Q235강표면제비Mo2FeB2금속도자도층.장반응열분도제비적도층재진공로중1 000℃하열처리5h,측시도층적성능.결과표명:재실온구마15h후분체중유Fe2B생성,재900℃하소결후파쇄적분도분말중유부분삼원붕화물(Mo2FeB2)생성:도층유점주체적Mo2FeB2화α-Fe상화소량Fe2O3、FeO상급기공조성.재도층화기체적결합면처,존재유고경도도층도저경도강기체적과도구；도층화기체적결합강도위32.73 MPa,항열진차수가이체도43차좌우,내마성비강기체제고5.28배；도층경과1 000℃진공확산열처리후,구유경가우이적역학성능.
The powders of Mo2FeB2 cermet were prepared with Mo powders,Fe-B alloy powders and Fe powders as raw materials.Mo2FeB2 cermet coatings were prepared on Q235 steel by reactive thermal spraying (RTS) method and heated at 1 000 ℃ in vacuum oven of 1 kPa for 5 h.The properties of coatings were investigated.The results indicate that Fe2B appears after milling for 15 h in the powder at room temperature,a part of ternary borides (Mo2FeB2) are generated in powder sintered at 900 C.The coatings are composed of the major phases Mo2FeB2 and α-Fe,a little of Fe2O3,FeO and some pores.The bonding strength between the substrate and the ceramic coating is 32.73 MPa,the thermal-shock times is about 43 and the wear resistance is enhanced by approximately 5.28 times compared with that of the substrate,respectively.The comprehensive properties of Mo2FeB2 cermet coatings can be improved further after vacuum heat-treatment at 1 000 ℃ for 5 h.