La2O3/SiCw/TiCN纳米无粘结相表面微织构刀具及其高速干切削性能研究

针对高速干切削带来的摩擦加剧、温度上升和刀具寿命下降的问题，项目拟设计制备La2O3和SiC晶须（SiCw）强韧化的纳米无粘结相碳氮化钛(TiCN)基刀具，考察其高速干切削性能。系统地研究La2O3和SiCw对TiCN基纳米无粘结相刀具材料微观组织、力学性能的影响规律，阐明其强韧化机制；研究放电等离子烧结技术对表面微织构形貌的控制能力，分析表面微织构形式与La2O3/SiCw/TiCN纳米无粘结相材料摩擦性能的映射关系，优化表面微织构形式，揭示其耐磨减摩机理；研究具有表面微织构的La2O3/SiCw/TiCN纳米无粘结相刀具的高速干切削性能，建立La2O3/SiCw/TiCN纳米无粘结相刀具表面微织构、材料力学性能与刀具高速干切削性能间的关系模型，探索优化La2O3/SiCw/TiCN纳米无粘结相刀具高速干切削性能的理论与方法，为TiCN基纳米无粘结相表面微织构刀具的开发和应用提供理论支撑

In the face of the issues of intensified friction, elevated temperature and declined tool life expectancy which are brought about by high speed dry cutting, this project is intended to tentatively design and prepare nanometer binderless titanium carbonitride based cutting tool strengthened and toughened by La2O3 and SiCw and to study the performance of high speed dry cutting. The project systematically explores the impact of La2O3 and SiCw on nanometer binderless titanium carbonitride cutting tool materials in terms of microstructure and mechanical properties, elaborate on its strengthening and toughening mechanism, examine the capability of spark plasma sintering to control the morphology of surface micro texture, analyze the reflective relationship between the form of surface micro texture and tribology performance of La2O3/SiCw/TiCN nanometer binderless cutting tool materials, optimize the form of surface micro texture, and disclose the mechanism of durability and friction reduction.The project also examines the performance of high speed dry cutting featuring La2O3/SiCw/TiCN nanometer binderless tool with surface micro texture, establishes the relational model among surface micro texture and mechanical properties of La2O3/SiCw/TiCN nanometer binderless tool and the performance of the high speed dry cutting, explores the theories and methods pertaining to the optimization of high speed dry cutting performance of La2O3/SiCw/TiCN nanometer binderless tool with surface micro texture, providing the theoretical foundation for the development and application of TiCN based nanometer biderless tool with surface micro texture.