Reduction of Wear in Cemented Carbide Inserts By Coating Process – A Review
Author(s):
M.Pradeep, R.Rajeshkannan, A.Ramesh, S.Robin, S.Manoj
Keywords:
Turning, Inserts, coating, PVD, CVD, Wear, Tribology
Abstract
The manufacturing industries are constantly striving to increase the quality of the machined parts and decrease its cutting costs as the demand for high tolerance manufactured goods are rapidly increasing. The driving force behind the development of cutting tool materials are the increasing need to boost productivity, to machine more difficult materials and to improve quality in high volume by the manufacturing industry has been. The productivity enhancement of manufacturing processes imposes the acceleration of the design and evolution of improved cutting tools with respect to the achievement of a superior tribological attainment and wear-resistance. In modern materials, the functionality is often improved by combining several materials of different properties into composites. Many classes of composites are available, most of which are addressing improved mechanical properties such as strength, stiffness, resistance and toughness to fatigue. Coating composites are specifically designed to improve chemical and tribological functions. It is thus natural to select the bulk of a component to meet the demands for toughness, strength, stiffness, formability, cost, etc. and then modify or add another material as a thin surface layer. This coating or surface layer is the carrier of virtually all other functional properties. Application of coatings on machine elements and tools are, therefore, a very efficient way of improving their wear resistance and friction. The combined substrate-coating properties ultimately determine the important properties such as wear, adhesion strength and abrasion resistance of a coating. A hard wear resistant coating cannot perform well unless complimented by a tough and hard substrate. Thus, a hard coating made on a soft substrate leads to poor properties. Due to their significantly higher hardness, carbide-cutting tools are more widely used in the manufacturing industry rather than high-speed steels. Coated and uncoated carbides are widely used in the metal working industry and provide the best substitute for most turning operations. Due to their heat resistance, cemented carbides can be used in applications where high temperatures exist and all types of PVD and CVD processes can be used
Article Details
Unique Paper ID: 144613

Publication Volume & Issue: Volume 4, Issue 1

Page(s): 155 - 163
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