Three　kinds　of　thermal　spray　powders　with　different　densities　and　WC　particle　sizes　were　prepared　using　in-situ　synthesized　nanoscale　WC-Co　composite　powder　as　raw　material.　The　WC-Co　coatings　were　then　fabricated　by　high　velocity　oxy-fuel　thermal　spraying.　The　phase　constitution　of　the　as-sprayed　coatings　and　microstructures　of　the　feedstock　particles　and　the　coatings　were　analyzed.　The　results　show　that　the　coating　prepared　using　powder　with　a　relatively　higher　density　and　smaller　WC　particle　size　exhibits　simultaneously　lower　decarburization　and　higher　density,　and　further　enhanced　hardness.　The　present　study　suggests　an　effective　method　to　fabricate　nanostructured　WC-based　cermet　coatings　with　high　properties.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.