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Revealing true porosity in WC-Co thermal spray coatings
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Journal Article
Revealing true porosity in WC-Co thermal spray coatings
1997
Overview
The principles underlying composite material behavior during metallographic preparation of coating cross-sections are generally not well understood. This study of the effect of extended fine polishing on apparent porosity shows that adequate polishing times, using a fine abrasive (3 mu m) and low force, are required to remove prior deformation in the section surface and to reveal the true porosity of the underlying composite material. Insufficient polishing times can result in considerable underestimation of porosity. A model is described which proposes that the deformation induced in the material during grinding and polishing, even at low applied force, results in smearing of material into voids that exist in the plane of the section.
Publisher
Springer,Springer Nature B.V
