(1. 中南大学 粉末冶金国家重点实验室，长沙 410083；
2. 三峡大学 机械与材料学院，宜昌 443002；
3. 湘潭大学 机械工程学院，湘潭 411105)
摘 要: 综述了目前应用于涂层基体的无立方相层含氮功能梯度硬质合金的研究进展；详细介绍无立方相层的形成热力学基础、梯度结构特征、机理和动力学研究进展以及力学性能和切削性能；重点评述C、N含量以及组分对无立方相层的影响规律；提出获取合金系统真实的热力学相图和动力学数据是今后研究工作的重点。
关键字: 硬质合金；功能梯度材料(FGM)；无立方相层(CCFL)；机理；热力学；动力学
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. College of Mechanical and Materials Engineering, Three Gorges University, Yichang 443002, China;
3. School of Mechanical Engineering, Xiangtan University,Xiangtan 411105, China）
Abstract:The advance in functionally graded cemented carbide containing nitrogen with cubic carbide free layer (CCFL), which is used as coating substrate, was reviewed. Some aspects of CCFL were introduced in detail, including the thermodynamic foundation, the gradient structure features, formation mechanism and kinetic progress, mechanical properties and cutting performance. The effects of content of C, N and components on CCFL were commented. Focus on real thermodynamic phase diagrams and kinetic data in alloy system in the future research was proposed.
Key words: cemented carbide; functionally graded material (FGM); cubic carbide free layer (CCFL); mechanism; thermodynamics; kinetics
