Advances in Toughness and Thermal Stability of Diamond Coatings on Cemented Carbides
Cemented carbide has the advantages such as high hardness,strength,and toughness and is an important cutting tool material.Generally,the service life can be extended by coating on the surface of cemented carbides.Diamond coatings are the preferred choice for processing materials such as carbon fiber composites,graphite,and ceramics due to their extremely high hardness,wear resistance,high thermal conductivity,and low coefficient of thermal expansion.However,low toughness is the primary disadvantage that limits the application of diamond coatings on the cemented carbide.At the same time,high thermal stability is the key to stable service of diamond coating on cemented carbides under high speed and high temperature cutting conditions.Based on the structure and composition design of diamond coatings,this paper mainly focuses on the effects and mechanisms of multilayer and gradient diamond coating design on their toughness and related properties.The mechanisms and strategies for enhancing the thermal stability of diamond coatings are explored.Additionally,the preparation process of diamond coatings is summarized,and the experimental methods for precisely determining the fracture toughness and thermal stability of diamond coatings are summarized.It is intended to ascertain the design method of hard and tough diamond coatings with great thermal stability,so as to effectively improve the performance of cutting tools.
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