等离子喷涂-物理气相沉积的气相沉积机理

doi:10.15541/jim20170072

无机材料学报 ›› 2017, Vol. 32 ›› Issue (12): 1285-1291.DOI: 10.15541/jim20170072 CSTR: 32189.14.10.15541/jim20170072

等离子喷涂-物理气相沉积的气相沉积机理

邓子谦^1,2, 刘敏^2,3, 毛杰², 张小锋², 陈文龙², 陈志坤²

1. 广东工业大学材料与能源学院, 广州510006;
2. 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, 广东省现代表面工程技术重点实验室, 广州 510651;
3. 中南大学材料科学与工程学院, 长沙 410083

收稿日期:2017-02-20 修回日期:2017-04-27 出版日期:2017-12-20 网络出版日期:2017-11-21
作者简介:邓子谦(1988-), 男, 博士研究生. E-mail: dengziqian0404@163.com
基金资助:
广东省自然科学基金团队项目(2016A030312015);广东省广州市科学技术合作项目(2013B050800027, 201508030001, 2011C007);广东省科学院项目(2017GDASCX-0843, 2016GDASPT-0206, 2016GDASPT-0317);Guangdong Natural Science Foundation Project (2016A030312015);Science and Technology Cooperation Project of Guangdong Province, and of Guangzhou City (2013B050800027, 201508030001, 2011C007);Platform Construction Project of Guangdong Academy of Science (2017GDASCX-0843, 2016GDASPT-0206, 2016GDASPT-0317)

Deposition Mechanism Based on Plasma Spray-Physical Vapor Deposition

DENG Zi-Qian^1,2, LIU Min^2,3, MAO Jie², ZHANG Xiao-Feng², CHEN Wen-Long², CHEN Zhi-Kun²

1. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;
2. National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510651, China;
3. School of Materials Science and Engineering, Central South University, Changsha 410083, China

Received:2017-02-20 Revised:2017-04-27 Published:2017-12-20 Online:2017-11-21

摘要/Abstract

摘要：

以等离子喷涂-物理气相沉积(PS-PVD)喷涂团聚的 ZrO₂-7wt%Y₂O₃(7YSZ)粉末在五个喷距下制备了热障涂层。通过场发射-扫描电镜(FE-SEM)和X射线衍射(XRD)分析了五个涂层样品的微观结构和相成分差异。另外, 通过发射光谱(OES)诊断研究了射流中7YSZ粉末气相浓度随喷距的变化。最后, 阐述了3种不同的气相沉积涂层生长机制, 说明了射流中粉末的状态和气相浓度对涂层结构的影响。研究表明：(1)350 mm和1800 mm喷距下形成的均是致密结构涂层, 而650~1250 mm喷距下形成的是典型的PS-PVD柱状结构涂层。(2)350 mm喷距下制备的涂层由四方相(t’)和单斜相(m)氧化锆构成; 当喷距大于650 mm时, 涂层以四方相(t’)氧化锆为主。(3)350 mm喷距下涂层是由高浓度气相过饱和自发形核形成的新核和液/固粒子共同作用形成的; 喷距650~1250 mm下, 涂层生长以气相沉积于基体进行非自发形核为主, 气相在射流中的自发形核为辅; 喷距1800 mm下涂层由气相过冷凝固的粒子堆积而成。

关键词: PS-PVD, 涂层生长, 自发形核, 非自发形核, 光谱诊断

Abstract:

Thermal barrier coatings (TBCs) were prepared via plasma spray-physical vapor deposition (PS-PVD) technique at five spray distances by using agglomerated ZrO₂-7wt%Y₂O₃ (7YSZ) powders. The microstructure and phase composition of these coatings under different spray distances were analyzed by field emission-scanning electron microscope (FE-SEM) and X-ray diffraction (XRD). Besides, gas concentration of the powders in plasma jet was diagnosed with stand-off distances by Optical Emission Spectroscopy (OES). Eventually, three formation mechanisms of the PS-PVD coatings based on vapor deposition were proposed, and the relationship between the concentration of gas phase and the microstructure of the coatings was explained. The results reveal that: (1) the coatings prepared at spray distance of 350 mm and 1800 mm exhibit dense structure, while typical PS-PVD 7YSZ columnar coatings were formed at spraying distance of 650-1250 mm; (2) the coating formed at 350 mm spraying distance is composed of t°- and m-ZrO₂, and others are mainly composed of t°-ZrO₂ at over 650 mm stand-off distance; (3) At 350 mm spray distance, the coating is developed under the combination effect of the supersaturated spontaneous nucleation from high concentration of the gas phase and liquid/solid particles. At spraying distance of 650-1250 mm, the growth of columnar coatings are dominated by the non-spontaneous nucleation after the deposition of gas phase on the substrate, and supplemented by spontaneous nucleation in plasma jet. At spraying distance of 1800 mm, the coating is accumulated from spontaneous re-solidified gas phase particles.

Key words: PS-PVD, coating growth, non-/spontaneous nucleation, spectral diagnosis

中图分类号:

TQ174

邓子谦, 刘敏, 毛杰, 张小锋, 陈文龙, 陈志坤. 等离子喷涂-物理气相沉积的气相沉积机理[J]. 无机材料学报, 2017, 32(12): 1285-1291.

DENG Zi-Qian, LIU Min, MAO Jie, ZHANG Xiao-Feng, CHEN Wen-Long, CHEN Zhi-Kun. Deposition Mechanism Based on Plasma Spray-Physical Vapor Deposition[J]. Journal of Inorganic Materials, 2017, 32(12): 1285-1291.

图/表 8

图1 Mecto 6700粉末形貌

Fig. 1 Morphology of mecto 6700 powders

表1 PS-PVD 喷涂 7YSZ 热障涂层参数

Table 1 Parameters of 7YSZ coating by PS-PVD

Gun	Power/ kW	Ar/ slpm	He/ slpm	Chamber pressure/Pa	Feed rate/ (g•min^-1)	Stand-off distance/ mm
O3CP	127	35	60	150	20	350, 650, 950, 1250, 1800

图2 不同喷涂距离下的PS-PVD YSZ柱状结构涂层的SEM照片

Fig. 2 SEM morphologies of 7YSZ columnar coating formed at different stand-off distances^(a) (d) 650 mm; (b) (e) 950 mm; (c) (f) 1250 mm

图3 不同喷涂距离下的PS-PVD YSZ致密结构涂层的SEM照片

Fig. 3 SEM morphologies of 7YSZ dense coating formed at different stand-off distances^(a) (c) 350 mm; (b) (d) 1800 mm

图4 原始粉末与5个喷距样品的XRD图谱

Fig. 4 XRD patterns of original powder and the coatings with 5 stand-off distances

图5 不同轴向上的光谱诊断(Zr 波长360.1 nm)

Fig. 5 OES diagnostic in different stand-off distances (Zr 360.1 nm )

图6 (a) PS-PVD的过饱和效应和(b)自发形核

Fig. 6 (a) Saturation effect based on PS-PVD and (b) schematic diagram of spontaneous nucleation

图7 非自发形核示意图

Fig. 7 Schematic diagram of non-spontaneous nucleation

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等离子喷涂-物理气相沉积的气相沉积机理

Deposition Mechanism Based on Plasma Spray-Physical Vapor Deposition

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