Structure/Property Relationship of CVD-TiC Coatings on WC-Co
The advent of coated cemented carbides represents the greatest advance in cutting tool technology since the development of the tungsten carbide (WC-Co) tool itself. It can be said without exaggeration that coated tools have lead to expotential increases in metal cutting productivity. Since their introduction around ten years ago, several types of wear resistant coatings (i.e. TiC, TiN, Al2O3 etc.) have been developed and commercialized. Most of these developments have been achieved via monitoring the properties of these coatings using hardness, transverse rupture strength (TRS), and wear as characterized by machining.1,2,3 Limited work on relating these properties to structure and morphology of the coating as determined by optical and scanning electron microscopy (SEM) has been reported.4 Unfortunately these structural analyses have not provided more than a superficial insight into the several factors that can greatly affect the physical and wear resistant properties of these coatings, namely grain size and morphology, impurities, defects, stoichometry and concentration gradients. A better understanding of their roles in improving or degrading coating durability and performance may lead to further improvement of wear resistant coatings.
KeywordsTool Wear Abrasive Wear Flank Wear Grain Morphology Wear Resistant Coating
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