CAJ | 학술논문

在"一步法"火焰喷焊的基础上再增加一次重熔工艺.研究重熔对钛合金表面火焰喷焊制备的涂层中气孔的影响,并分析涂层中气孔的成因.工艺Ⅰ是在Ti6Al4V钛合金表面采用"一步法"火焰喷焊法制备镍基碳化钨涂层,工艺Ⅱ为在工艺Ⅰ制备的涂层上再增加一次重熔步骤.利用扫描电镜(SEM)对两种工艺所获取的涂层端面进行分析.扫描电镜照片显示增加一次重熔可有效地减少气孔.增加重熔后,使原来由于阴影效应和燃烧焰流大的吹力所产生的气孔和在粘稠的熔融金属上浮困难的气孔增加了气体排出机会,有效地减少了气孔;但增加重熔后,涂层中仍存在少量、小卵状的气孔,表明增加重熔可最大程度地减少气孔,但难以杜绝气孔的产生.
재"일보법"화염분한적기출상재증가일차중용공예.연구중용대태합금표면화염분한제비적도층중기공적영향,병분석도층중기공적성인.공예Ⅰ시재Ti6Al4V태합금표면채용"일보법"화염분한법제비얼기탄화오도층,공예Ⅱ위재공예Ⅰ제비적도층상재증가일차중용보취.이용소묘전경(SEM)대량충공예소획취적도층단면진행분석.소묘전경조편현시증가일차중용가유효지감소기공.증가중용후,사원래유우음영효응화연소염류대적취력소산생적기공화재점주적용융금속상부곤난적기공증가료기체배출궤회,유효지감소료기공;단증가중용후,도층중잉존재소량、소란상적기공,표명증가중용가최대정도지감소기공,단난이두절기공적산생.
Adding remelting treatment on "one step method" flame spray-welding, the effects of adding re-melting treatment on flame spray-welding coating's porosities of titanium alloys substrate were researched. Processing Ⅰ is "one step method" flame spray-welding, using this processing can spray makes Ni-based WC coating on Ti6AI4V substrates. Technological Ⅱ adds re-melting treatment after technological Ⅰ. These coatings' cross section was analyzed by SEM method. Using technological Ⅰ Ni-based WC coating, there are raff, vast scale and condensed porosities between titanium, alloys surface and coating. After remelting treatment, coating is better, it can effectively reduce border's porosities, strengthen layer's porosities and reduce artificial variable. After grinding external layer, there still have, appearance small & ovum porosities in strengthen coating, which is decided by flame spray-welding method itself. Using flame spray-welding methods prepare coating, based on "one step method", adding re-melting treatment can reduce coating's porosities.