CAJ | 학술논문

以MoSi_2粉末为喷涂原料,采用大气等离子喷涂技术,在K403镍基合金表面制备了二硅化钼涂层,考察了不同喷涂距离和氩气流量对MoSi_2涂层的相组成和微观组织的影响.结果表明,随喷涂距离的增加,涂层的相组成由富硅相向富钼相演变;氩气流量的增大可减少涂层中的富钼相,但若流量过大,则会降低涂层的致密性;采用喷涂功率为30 kW、喷涂距离为100 mm和氩气流量为50 L/min的喷涂工艺可制备出以MoSi_2为主相且致密性较高的涂层,明显提高了基体的高温抗氧化性.
이MoSi_2분말위분도원료,채용대기등리자분도기술,재K403얼기합금표면제비료이규화목도층,고찰료불동분도거리화아기류량대MoSi_2도층적상조성화미관조직적영향.결과표명,수분도거리적증가,도층적상조성유부규상향부목상연변;아기류량적증대가감소도층중적부목상,단약류량과대,칙회강저도층적치밀성;채용분도공솔위30 kW、분도거리위100 mm화아기류량위50 L/min적분도공예가제비출이MoSi_2위주상차치밀성교고적도층,명현제고료기체적고온항양화성.
Using MoSi_2 powder as spraying material, MoSi_2 coating was prepared on the surface of K403 nickel-base alloy by atmospheric plasma spraying technique. The effects of different spraying distance and argon flow on phase composition and microstructure of MoSi_2 coating were investigated. The results showed that phase composition of the coating changed from Si-rich phase to Mo-rich phase with the increase of the spraying distance. The increase of argon flow can reduce Mo-rich phase in the coating, however, if the flow is excessive, the coating compactness decreases. The coatings with high compactness and MoSi_2 as main phase were prepared by the spraying process with 30 kW spraying power, 100 mm spraying distance and 50 L/min argon flow, which obviously improved the high temperature oxidation resistance of the matrix.