A Methodology to Control the Microstructure of Plasma Sprayed Coatings

微观结构 材料科学 粒子(生态学) 涂层 质点速度 扫描电子显微镜 等离子体 粒径 机械 沉积(地质) 机械工程 复合材料 工程类 物理 化学工程 古生物学 海洋学 量子力学 沉积物 生物 地质学
作者
Martin Friis
链接
摘要

The aim of this thesis is to enhance the overall understanding of the plasma spray process and increase control and reproducibility of the coating properties. This was performed by establishment of relationships between controllable process parameters, in-flight properties of the injected particles (velocity and temperature), and microstructure properties. The relationships were used to establish a process control strategy. The research was performed in two areas. The first area is numerical simulation using computational fluid dynamics to model the plasma, the particle in-flight properties, and the plasma particle interactions. The second area is applied experimental research, focused on observations, measurements and statistical modeling techniques. The experimental work included measurements of particle properties, and evaluation of coating microstructures, using scanning electron microscopy and an in-house image analysis code. It was shown that the relationships were satisfactorily modeled by statistical linear regression. Particle velocity and temperature could be independently controlled by the arc current and the primary gas flow rate. The variables having the largest influence on the microstructure were found to be particle velocity, particle temperature, substrate temperature, and spray angle. The process control strategy was developed by creation of process maps, describing individual microstructure features, and deposition efficiency, as functions of particle velocity and temperature. Based on these maps a process control methodology, called process windows, was established. In this method each desired coating criteria are specified and corresponding particle velocity and particle temperature ranges determined. Keeping the particle properties within these ranges ensures the coating to meet its requirements. It was also shown that prior to implementation of the process window methodology, enhanced reproducibility can be achieved by reduction of spray gun tolerance limits. This work should be regarded as a foundation for a process control tool by which coating properties can be controlled and optimized on-line in industrial production.

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
思源应助满意凡桃采纳,获得10
1秒前
CodeCraft应助陈隆采纳,获得10
2秒前
义气的银耳汤完成签到 ,获得积分10
2秒前
HY兑完成签到,获得积分10
3秒前
zhhui完成签到,获得积分10
3秒前
3秒前
ymlllym发布了新的文献求助10
3秒前
4秒前
慕青应助Mr.Su采纳,获得10
4秒前
顾矜应助yanyuqing采纳,获得10
4秒前
lee发布了新的文献求助30
4秒前
SYLH应助得鹿梦鱼采纳,获得10
4秒前
Teresa发布了新的文献求助10
5秒前
5秒前
358489228完成签到,获得积分10
6秒前
科奇应助hyper3than采纳,获得10
7秒前
8秒前
好多好多鱼完成签到 ,获得积分10
8秒前
量子星尘发布了新的文献求助10
9秒前
YM发布了新的文献求助10
9秒前
10秒前
10秒前
YU发布了新的文献求助10
10秒前
10秒前
种草发布了新的文献求助10
10秒前
Lucas应助端庄的雁易采纳,获得10
11秒前
樱桃完成签到 ,获得积分10
11秒前
11秒前
12秒前
慕青应助soulking采纳,获得10
12秒前
13秒前
sluck完成签到,获得积分10
13秒前
ymlllym完成签到,获得积分10
13秒前
iiiau发布了新的文献求助10
14秒前
游鱼完成签到,获得积分10
14秒前
14秒前
xuxuxuxuxu完成签到,获得积分10
14秒前
ku_zhang完成签到 ,获得积分10
14秒前
15秒前
写个锤子完成签到,获得积分10
15秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Picture Books with Same-sex Parented Families: Unintentional Censorship 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3970172
求助须知:如何正确求助?哪些是违规求助? 3514982
关于积分的说明 11176568
捐赠科研通 3250212
什么是DOI,文献DOI怎么找? 1795198
邀请新用户注册赠送积分活动 875702
科研通“疑难数据库(出版商)”最低求助积分说明 805004