Gordon England Surface Engineering Forum

Metallography of Thermal Spray Coatings
Effects of Metallographic Preparation Technique

Ceramic coating prepared using fairly typical metallographic techniques
for ferrous materials, showing the effects of particle pluck outCeramic coating prepared using fairly typical metallographic techniques
for ferrous materials, showing the effects of particle pluck outCeramic coating prepared using special metallographic techniques
for thermal spray coatings, showing improved results

Photomicrographs of the same poorly plasma sprayed alumina / 3% titania coating at about X50 magnifgication. This coating was poorly sprayed by depositing the coating too thickly per pass generating lamination faults. The metallographic preparation precedure for each was slightly different. The two photomicrographs on the left were prepared using fairly typical metallographic techniques for ferrous materials, showing the effects of "particle pluck out". The photomicrograph on the right was prepared using special developed techniques specifically for plasma sprayed alumina ceramic coatings, showing clearly the crack edges, unmelted particles and a more realistic view of density.

Ceramic coating prepared using fairly typical metallographic techniques
for ferrous materials, showing the effects of particle pluck outCeramic coating prepared using fairly typical metallographic techniques
for ferrous materials, showing the effects of particle pluck outCeramic coating prepared using special metallographic techniques
for thermal spray coatings, showing improved results

Photomicrographs of the same plasma sprayed alumina/3% titania coating at about X250 magnifgication.









Gordon England Independent Thermal Spray Coating Consultant
Telephone: +44 (0)1252 405186

Email: tsc@gordonengland.co.uk

Site Links



Introducing

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

Applications:

Thermal Spray Coatings on Carbon and Glass Fibre Reinforced Polymers

HVOF Coating of Paper Making Roll

Abradable Coatings

Photomicrographs

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

Contact Form

Links to other interesting sites related to thermal spray and surface engineering

Reciprocal Links

Periodic Table of the Elements

SI Units

Calculators for Conversion between Units of Measurement

Hardness Testing

Surface Engineering Message Board Archive

Surface Engineering Message Board Archive Index

Photography Gallery2

Photography Gallery3


© Copyright Gordon England