18th, Laser Aided Plasma Diagnostics

Optical monitoring systems for thermal spray processes: droplet behavior and substrate pre-treatments

Sep 27, 2017, 12:10 PM

15m

ORAL Low-temperature plasmas Oral

Speaker

Prof. Katsunori Muraoka (Plazwire Co., Ltd, 2-3-54 Higashi-naka, Fukuoka 812-0892, Japan)

Description

Thermal spray is a technique to form molten droplets using either plasma- or combustion-heating, which impinge upon substrates to form coating layers for various purposes, such as anti-corrosion and anti-wear layers. Although it is an established technique having a history of more than a century, operations of spray guns together with preparing suitable substrate surfaces for obtaining good coating layers still rely on experienced technicians. Because of the necessity of meeting more and more stringent requirements for coating quality and cost from customers, there has been a strong need to try to monitor spray processes, so as to obtain best possible spray coating layers. Basic requirements for such monitoring systems are - reasonably cheap - easy operation for laypersons - easy access to targets to be investigated - an in-situ capability. The purpose of the present work is to provide suitable optical monitoring systems for (1) droplet behavior and (2) substrate pre-treatments. For the former (1), the first result was already presented at the last LAPD17 meeting in 2015 at Sapporo, and results of its subsequent applications into real spray environments are to be shown at this meeting in order to validate the proposal. On the other hand, the latter (2) has been added as a new topic in the research programs, and a preliminary experiment has been started. In addition, an overall strategy is being planned to fulfill the final objective of the optical monitoring of substrate pre-treatments. Details of these two programs (1) and (2) together with the present statuses are presented. *Presenting author: k-muraoka@plazwire.co.jp

Presentation materials

Paper

jmwmb876@ybb.ne.jp