等离子喷涂-物理气相沉积射流中粒子状态和分布
发布时间：2019-05-17 16:37
【摘要】：采用等离子喷涂-物理气相沉积(PS-PVD)在高温合金基体上沉积7YSZ热障涂层,通过分步沉积实验、径向和轴向的涂层结构分布实验探讨了涂层中各种粒子的种类、形成原因、对涂层结构的影响及射流中的粒子分布。研究表明:PS-PVD实际上是一种以气相沉积为主,多相混合的沉积方式。涂层的沉积过程中,气相沉积是柱状晶形成的主要原因;熔融及部分熔融的大颗粒对可以直接改变柱状结构的生长状态;气相再凝固和气化不充分残留的小颗粒对涂层的影响是一个累积的过程。气相主要集中在射流中心,越靠近射流边缘,部分熔融粒子的比例越高,最终导致PS-PVD沉积涂层结构出现空间分布特征。
[Abstract]:7YSZ thermal barrier coatings were deposited on superalloy substrate by plasma spraying physical vapor deposition (PS-PVD). The types and causes of various particles in the coatings were discussed by step deposition experiments and radial and axial coating structure distribution experiments. The effect on the structure of the coating and the distribution of particles in the jet. The results show that PS-PVD is actually a kind of multi-phase mixed deposition, which is mainly based on vapor deposition. In the process of coating deposition, vapor deposition is the main reason for the formation of columnar crystals, and the large particle pairs of melting and partial melting can directly change the growth state of columnar structure. The effect of gas phase resolidification and insufficient gasification on the coating is a cumulative process. The gas phase is mainly concentrated in the center of the jet. The closer it is to the edge of the jet, the higher the proportion of partially molten particles is, which leads to the spatial distribution of PS-PVD deposition coating structure.
【作者单位】： 广东工业大学材料与能源学院;广东省新材料研究所现代材料表面工程技术国家工程实验室;广东省新材料研究所广东省现代表面工程技术重点实验室;中南大学材料科学与工程学院;
【基金】：广东省自然科学基金(2016A030312015) 广东省(广州市)科学技术合作项目(2013B050800027,201508030001)~~
【分类号】：TG174.4
[Abstract]:7YSZ thermal barrier coatings were deposited on superalloy substrate by plasma spraying physical vapor deposition (PS-PVD). The types and causes of various particles in the coatings were discussed by step deposition experiments and radial and axial coating structure distribution experiments. The effect on the structure of the coating and the distribution of particles in the jet. The results show that PS-PVD is actually a kind of multi-phase mixed deposition, which is mainly based on vapor deposition. In the process of coating deposition, vapor deposition is the main reason for the formation of columnar crystals, and the large particle pairs of melting and partial melting can directly change the growth state of columnar structure. The effect of gas phase resolidification and insufficient gasification on the coating is a cumulative process. The gas phase is mainly concentrated in the center of the jet. The closer it is to the edge of the jet, the higher the proportion of partially molten particles is, which leads to the spatial distribution of PS-PVD deposition coating structure.
【作者单位】： 广东工业大学材料与能源学院;广东省新材料研究所现代材料表面工程技术国家工程实验室;广东省新材料研究所广东省现代表面工程技术重点实验室;中南大学材料科学与工程学院;
【基金】：广东省自然科学基金(2016A030312015) 广东省(广州市)科学技术合作项目(2013B050800027,201508030001)~~
【分类号】：TG174.4
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