Surface preparation by using laser cleaning in thermal spray

2008 ◽  
Vol 20 (1) ◽  
pp. 12-21 ◽  
Author(s):  
H. Li ◽  
S. Costil ◽  
H-L. Liao ◽  
C. Coddet ◽  
V. Barnier ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Surface Preparation ◽  
Laser Cleaning

scholarly journals On the surface preparation of nickel superalloys before CoNiCrAlY deposition by thermal spray

2004 ◽  
Vol 184 (2-3) ◽  
pp. 156-162 ◽  
Author(s):  
U. Bardi ◽  
L. Carrafiello ◽  
R. Groppetti ◽  
F. Niccolai ◽  
G. Rizzi ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Surface Preparation ◽  
Nickel Superalloys

APPLICABILITY OF A NEW SURFACE PREPARATION METHOD FOR STEEL STRUCTURE USING LASER

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Hiroshi Ogami ◽  
Katashi Fujii ◽  
Yukio Manabe ◽  
Kohei Ota ◽  
Asuo Yonekura
Keyword(s):  
Preparation Method ◽  
Surface Condition ◽  
Surface Preparation ◽  
Steel Structure ◽  
Steel Structures ◽  
Laser Cleaning ◽  
Coating Film ◽  
Test Results ◽  
Corrosion Prevention ◽  
Accelerated Corrosion

Surface preparation is very important in re-painting of steel structures so as to extend the effective term of corrosion prevention. Though grinding or blasting have been widely used to remove rust and old coating film on steel surface, both these methods have difficulty in completion of rust-removal and cause some problems such as dust scattering, noise, etc. In order to solve these problems, this paper presents the laser cleaning method which instantaneously sublimes/evaporates the rust on the surface of steel structure. The authors investigate the effects and the applicability of laser cleaning using the specimens made by accelerated corrosion method. The test results confirmed that the laser cleaning can remove the rust almost much as using sand blast, and the salt on the surface of steel can also be evaporated as good as the rust. Moreover, this method seems can be applied on wet surface condition because the moisture and water on the surface of steel can also be evaporated.

Numerical Simulation of Excimer Laser Cleaning of Film and Particle Contaminants

2013 ◽  
Vol 135 (12) ◽  
Author(s):  
S. Marimuthu ◽  
A. Mhich ◽  
I. S. Molchan ◽  
D. Whitehead ◽  
Z. B. Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Excimer Laser ◽  
Laser Power ◽  
Surface Preparation ◽  
Experimental Tests ◽  
Processing Parameters ◽  
Laser Cleaning ◽  
Optimum Number ◽  
Preparation Technique ◽  
Contaminant Removal

Laser cleaning is a promising surface preparation technique for applications in high value manufacturing industries. However, understanding the effects of laser processing parameters on various types of contaminants and substrates, is vital to achieve the required cleaning efficacy and quality. In this paper, a two-dimensional transient numerical simulation was carried out to study the material ablation characteristics and substrate thermal effects in laser cleaning of aerospace alloys. Element birth and death method was employed to track the contaminant removal on the surface of the material. The result shows that contaminant ablation increases with laser power and number of pulses. The finite element method (FEM) model is capable enough to predict the optimum number of pulses and laser power required to remove various contaminants. Based on the simulation results, the mechanism of the excimer laser cleaning is proposed. Thus, the use of numerical simulation can be faster and cheaper method of establishing the optimum laser cleaning window and reducing the number of experimental tests.

Thermal Spray Deposition of A Copper Coating on Aluminium Using the Protal Process

1998 ◽  
Author(s):  
S. Ayrault-Costil ◽  
G. Montavon ◽  
C. Coddet ◽  
F. Rigollet ◽  
O. Freneaux ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Spray Deposition ◽  
Surface Preparation ◽  
Copper Coating ◽  
Machine Shop ◽  
Coating Deposition ◽  
Copper Coatings ◽  
Classical Procedure ◽  
Aluminum Base ◽  
Base Substrate

Abstract In this work, the benefits of the PROTAL® process were investigated, comparing adhesion and morphology of different APS thermal spray copper coatings onto an aluminum base substrate. The PROTAL® process operates simultaneously an atmospheric thermal spray torch and a Q-switched laser (Nd:YAG) to perform surface preparation and coating deposition in a single operation. In that case, substrates are coated rough from the machine shop, i.e. without any prior surface preparation. Results obtained in this way were compared with results obtained using a classical procedure, Le, degreasing followed by sandblasting prior to coating deposition.

The Benefits of the PROTAL Process on the Adhesion of Thermal Sprayed Coating

2000 ◽  
Author(s):  
G. Barbezat ◽  
F. Folio ◽  
C. Coddet ◽  
G. Montavon
Keyword(s):  
Thermal Spray ◽  
Nd:Yag Laser ◽  
Tensile Testing ◽  
Surface Preparation ◽  
Single Step ◽  
Indentation Method ◽  
Pulsed Nd:Yag Laser ◽  
Metallurgical Bonding ◽  
New Process ◽  
Sprayed Coating

Abstract In this paper, the authors evaluate the effect of different laser parameters on the adhesion of coatings produced by the Protal method. The process incorporates an atmospheric thermal spray torch and a pulsed Nd:YAG laser, achieving surface preparation (comparable to grit blasting) and coating deposition in a single step. Coating adhesion was measured via tensile testing and an indentation method, and the rupture areas (along with some of the coating-substrate interfaces) were examined using SEM techniques. The results show that with the new process chemical and metallurgical bonding can be achieved between the substrate and coating by spraying in air.

Surface Preparation and Thermal Spray in a Single Step: The Protal Process

1998 ◽  
Author(s):  
C. Coddet ◽  
G. Montavon ◽  
T. Marchione ◽  
O. Freneaux
Keyword(s):  
Laser Irradiation ◽  
Thermal Spray ◽  
Surface State ◽  
Surface Preparation ◽  
Surface Characteristics ◽  
Industrial Applications ◽  
Single Step ◽  
Porosity Level ◽  
Sand Blasting ◽  
Deposit Characteristics

Abstract Thermal spray techniques can fulfill numerous industrial applications. Coatings are hence applied to resist against wear, corrosion, or to modify the surface characteristics of the substrate (e.g., conductivity, etc.). However, many of these applications remain inhibited by some deposit characteristics, such as a limited coating adhesion or pores, or by industrial costs since several non-synchronized steps (i.e., degreasing, sand-blasting and spraying) are needed to manufacture a deposit. The PROTAL® process was designed to reduce the aforementioned difficulties by implementing simultaneously a Q-switched laser and a thermal spray torch. The laser irradiation is aimed to eliminate the contamination films and oxide layers, to generate a surface state enhancing the deposit adhesion and to limit the contamination of the deposited layers by condensed vapors. From PROTAL® arises the possibility to reduce, indeed suppress, the preliminary steps of degreasing and sang-blasting. In addition, in some cases, a significant increase in the deposit adhesion versus standard preparation, a decrease of the porosity level and the increase of the deposit cohesion represent important additional effects of the process.

Surface Preparation and Thermal Spray in a Single Step: The PROTAL Process—Example of Application for an Aluminum-Base Substrate

1999 ◽  
Vol 8 (2) ◽  
pp. 235-257 ◽  
Author(s):  
C. Coddet ◽  
G. Montavon ◽  
S. Ayrault-Costil ◽  
O. Freneaux ◽  
F. Rigolet ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Surface Preparation ◽  
Single Step ◽  
Aluminum Base ◽  
Base Substrate

eXclean®: A New Surface Preparation of Turbine Components for Deposition of MCrAlY Coatings With Super Clean Interface

2008 ◽  
Author(s):  
Dario Russo ◽  
Andrea Scrivani ◽  
Gabriele Rizzi ◽  
Alessandro Lanzi ◽  
Carlo Giolli
Keyword(s):  
Thermal Spray ◽  
Plasma Spray ◽  
Bond Coat ◽  
Gas Turbines ◽  
Thermal Spray Technology ◽  
Turbine Blades ◽  
Base Material ◽  
Surface Preparation ◽  
Vacuum Plasma Spray ◽  
Material Interface

The most commonly used structural materials for blades and other high temperature components of gas turbines are nickel base superalloys. A TBC protection coating system consists of a top coat of yttria partially stabilized zirconia and an underlying bond coat, usually MCrAlY (where M stands for Ni, Co or a combination of both). MCrAlYs are normally deposited by the thermal spray processes: air plasma spray (APS), vacuum plasma spray (VPS/LPPS) or high velocity oxygen fuel (HVOF). The adhesion between the bond coat and the substrate, and therefore of the whole thermal barrier system, strongly depends upon the surface roughness. A high level of roughness generally denotes better adhesion, especially with the HVOF thermal spray process where it is a necessity. Generally the roughness is reached by means of grit blasting with an abrasive media; this results in a certain level of surface contamination due to the entrapment of abrasive particles. The aim of this work was to set up a new surface preparation process in order to obtain a completely clean surface with a suitable roughness, which can be coated afterwards with HVOF or VPS/LPPS thermal spray technology. The tests carried out by this process on turbine blades, coated with a HVOF system, led to obtaining a coating/base material interface without any contamination caused by the surface preparation.

scholarly journals Automated Thermal Spray Technology for Rehabilitation and Maintenance of Civil Works Infrastructure

1997 ◽  
Author(s):  
V.F. Hock ◽  
R. Senary ◽  
R. Ganertz ◽  
H. Herman
Keyword(s):  
Thermal Spray ◽  
Protective Coating ◽  
Thermal Spray Technology ◽  
Surface Preparation ◽  
Steel Structures ◽  
The Other ◽  
Steel Bridge ◽  
Linear Motion ◽  
Exposed Surface ◽  
Spray System

Abstract Conventional corrosion protection of steel structures has usually involved the application and reapplication of lead-based paint (LBP), a material now known to be highly toxic and likely to find its way into the environment. LBP is no longer used in the field, but repair crews, nearby communities, and the environment may be exposed to unacceptably high levels of lead as the substrates of older structures are prepared for repainting during routine M&R operations. Conventional dust-containment enclosures used onsite during surface preparation (abrasive blasting) are often inadequate. The most effective containment technologies, on the other hand, tend to be expensive and cumbersome. All of these factors make surface preparation and recoating slow, technically difficult, physically demanding, and hazardous to the worker and the environment. Automated technologies have the potential to address all aspects of these interrelated infrastructure M&R problems. An example of such a technology is the Automated Thermal Spray System (ATSS). The ATSS utilizes a triaxial array of linear motion actuators to form a robot capable of performing preprogrammed sequences. The demonstration proved that the ATSS can successfully remove deteriorated lead-based paint from a steel bridge and then apply a protective coating to the exposed surface.

Sign in / Sign up

Export Citation Format

Share Document