CAJ | 학술논문

很多参数都决定着热喷涂涂层的质量,如喷涂粉末性质、供粉状态、粉末的形貌、动力系统以及喷涂环境等。但在这些因素中,涂层与基材间的结合力是最基本的评价指标。为了使涂层和基材间具有良好的结合力,需要对基材进行表面清洁和预处理。通常使用有机溶剂对基材除油去污,并进行喷砂处理增大基材的表面粗糙度。但由于基材（如陶瓷）本身的性质以及形状,机械处理易造成基材的剥落或对整体性能产生不利影响。为获取一种合适的预处理工艺,科研工作者开展了大量预处理方式的研究,如水射流技术,干冰喷射清理,热处理等。其中激光烧蚀法是进行基材预处理的有效技术手段。此工作的目的是为了研究持续时间为10ns的Q开关Nd：YAG近红外激光发射的单束或复合式脉冲激光所引发的改性效应以及对界面结合力的影响,以陶瓷基复合材料上喷涂的氧化铝涂层为研究对象。结果表明,激光处理手段可引发材料的机械效应（锥形结构的形成）和化学效应,对涂层的结合性能可以起到良好的改性作用。
흔다삼수도결정착열분도도층적질량,여분도분말성질、공분상태、분말적형모、동력계통이급분도배경등。단재저사인소중,도층여기재간적결합력시최기본적평개지표。위료사도층화기재간구유량호적결합력,수요대기재진행표면청길화예처리。통상사용유궤용제대기재제유거오,병진행분사처리증대기재적표면조조도。단유우기재（여도자）본신적성질이급형상,궤계처리역조성기재적박락혹대정체성능산생불리영향。위획취일충합괄적예처리공예,과연공작자개전료대량예처리방식적연구,여수사류기술,간빙분사청리,열처리등。기중격광소식법시진행기재예처리적유효기술수단。차공작적목적시위료연구지속시간위10ns적Q개관Nd：YAG근홍외격광발사적단속혹복합식맥충격광소인발적개성효응이급대계면결합력적영향,이도자기복합재료상분도적양화려도층위연구대상。결과표명,격광처리수단가인발재료적궤계효응（추형결구적형성）화화학효응,대도층적결합성능가이기도량호적개성작용。
The quality of thermally sprayed coatings depends on a lot of parameters （spraying power,feedstock injection,morphology of the parts,kinetics and environment）. But among them,adherence between the coating and the substrate appears as the fundamental point. To favor a good interaction and also a good adherence between the coating and the substrate, it is often necessary to clean and prepare the substrate surface. Conventionally, solvents and sand-blasting are applied to remove the contaminants and increase the surface roughness for a mechanical anchorage. But according to the substrate nature （ceramic） or the substrate morphology, it can be prejudicial to apply a mechanical treatment due to a peeling of the surface or a decrease of the global properties. By this way some other treatments have to be investigated in order to obtain an appropriate preparation. From all of them （water jet,ice blasting,heating treatment,etc.）, laser ablation can be an interesting technology to prepare the substrate surface. The aim of this work was to study the modifications induced by 10 ns single or cumulative pulses of a Q-switched Nd：YAG near-infrared laser and its influence on the interface adhesion. The case of an alumina coating sprayed on a Ceramic Matrix Composite （CMC） has been studied.In these conditions, the laser treatment seems favorable from the adherence point of view according to the mechanical effect （induced by a cone-like structure） and the chemical effect.