Posted by John Groweg (18.104.22.168) on 21:40:19 02/03/06
I work in the oilfield industry. We have an application where we
are applying Cu-Ni-In HVOF 0.25 mm thick for corrosion protection.
The substrate is a custom Austenitic Manganese Chrome stainless
steel (140KSI 0.2% min yield) which has a Brinell
hardness range of 300-415. We want to shot peen the substrate with
S-780 shot before HVOF to increase fatigue life of the substrate.
Shot peening will significantly increase surface hardness.
What is the maximum practical surface hardness of the substrate to insure that grit blasting will be adequate for proper bond strength of the HVOF? We don't want the surface to be so hard that grit blasting before HVOF is ineffective. At the same time, the part in question is subjected cyclic bending fatigue in corrosive media and has a history of corrosion fatigue failure. We need the shot peening to increase fatigue life and HVOF for corrosion protection.
Fatigue/corrosion testing has shown the HVOF to be superior other coating options.
Nature of Thermal Spray Coatings
Surface Engineering in a Nutshell
Surface Engineering Forum
Thermal Spray Gun Repair Service
Plasma Consumable Parts
Thermal Spray Powder Supplies
Thermal Spray Coatings on Carbon and Glass Fibre Reinforced Polymers
HVOF Coating of Paper Making Roll
Thermal Spray Processes:
Combustion Wire Thermal Spray Process
Combustion Powder Thermal Spray Process
Arc Wire Thermal Spray Process
Plasma Thermal Spray Process
HVOF Thermal Spray Process
HVAF Thermal Spray Process
Detonation Thermal Spray Process
Plasma Flame Theory
Cold Spray Coating Process
Wear and Use of Thermal Spray Coatings
Corrosion and Use of Thermal Spray Coatings
Glossary of Thermal Spray and Surface Engineering Terms
Image Directory for Thermal Spray Coatings
Plasma Gas Flow Information
Plasma Gas Flow Correction Calculator
Links to other interesting sites related to thermal spray and surface engineering
Periodic Table of the Elements
Calculators for Conversion between Units of Measurement
Surface Engineering Message Board Archive
Surface Engineering Message Board Archive Index
© Copyright Gordon England