摘要
硬质合金因具有较高硬度、强度与韧性等综合优势而成为重要的切削工具材料,通过在硬质合金表面进行涂层可以延长使用寿命。金刚石涂层由于具有极高硬度、耐磨性、高热导率和低热膨胀系数,成为加工碳纤维复合材料、石墨和陶瓷等材料的首选。然而,低韧性是限制硬质合金基体表面金刚石涂层进一步应用的主要缺点。同时,高热稳定性是硬质合金基体表面金刚石涂层在高速高温切削条件下稳定服役的关键。本文基于硬质合金基体表面金刚石涂层的结构与成分设计的研究现状,重点综述了多层及梯度金刚石涂层设计对其韧性及相关性能的影响及机理,就提升金刚石涂层热稳定性的策略与增强机理进行分析。综述了金刚石涂层制备工艺,并对准确评价金刚石涂层断裂韧性及热稳定性的实验方法进行总结,旨在寻找“硬而韧”且具有高热稳定性的硬质合金基体表面金刚石涂层设计方法,以有效提升切削工具使用性能。
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.
作者
赵晓
刘艳明
王晨
李定坤
黄楠
Zhao Xiao;Liu Yanming;Wang Chen;Li Dingkun;Huang Nan(College of Materials Science and Engineering,Xi’an Shiyou University,Xi’an Shaanxi 710065,China;Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang Liaoning 110016,China)
出处
《硬质合金》
CAS
2024年第2期159-169,共11页
Cemented Carbides
基金
国家自然科学基金(51701157)
陕西省自然科学基础研究计划(2022JM-261)
西安石油大学研究生创新项目(YCS21211062)
中国科学院仪器设备功能开发创新项目(sjzx-gnkf-202203)。
关键词
硬质合金
金刚石涂层
韧性
热稳定性
cemented carbide
diamond coating
toughness
thermal stability
