基于纳米无粘结相(W,Mo)C的“反形貌”表面微织构刀具材料制备及其高速干切削性能研究

In terms of the issues of intensified friction, elevated temperature and declined tool life expectancy which are brought by high speed dry cutting, this project is intended to tentatively design and prepare inverse morphology nanometer binderless (W,Mo)C based cutting tool strengthened and toughened by La2O3 and Al2O3 and to study the performance of high speed dry cutting. The project systematically studies the preparation of nanometer composite Al2O3/La2O3/(W,Mo)C materials, discusses the effect of La2O3 and Al2O3 on nanometer binderless (W,Mo)C based cutting tool materials in terms of relationship between microstructure and mechanical properties, and clarifies its strengthening and toughening mechanism. The capability of spark plasma sintering to control surface micro texture with inverse morphology is examined. The reflective relationships between the form of surface micro texture and tribology performance of (W,Mo)C based nanometer binderless cutting tool materials are analyzed. The forms of surface micro texture are optimized and the mechanism of durability and friction reduction are disclosed. The performance of high speed dry cutting for (W,Mo)C based nanometer binderless tool with surface micro texture is investigated. The model among surface micro texture, mechanical properties of Al2O3/La2O3/(W,Mo)C nanometer binderless tool and the performance of the high speed dry cutting is established. The project explores the theories and methods about the optimization of high speed dry cutting performance of (W,Mo)C based nanometer binderless tool with surface micro texture, providing the theoretical foundation for the development and application of (W,Mo)C based nanometer binderless tool with surface micro texture.

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，项目拟设计制备纳米无粘结相(W, Mo)C基“反形貌”表面微织构刀具，考察其高速干切削性能。系统研究Al2O3/La2O3/(W,Mo)C纳米复合刀具材料的制备，探讨Al2O3和La2O3对(W, Mo)C基刀具材料微观组织、力学性能的影响规律，阐明其强韧化机制；结合激光加工和放电等离子烧结技术制备“反形貌”表面微织构形貌，分析表面微织构对(W, Mo)C基刀具材料摩擦性能的影响，优化表面微织构，揭示其耐磨减摩机理；研究具有表面微织构纳米(W, Mo)C基刀具的高速干切削性能，建立Al2O3/La2O3/ (W,Mo)C刀具表面微织构、力学性能与刀具高速干切削性能间的关系模型，探索优化 (W,Mo)C基刀具高速干切削性能的理论与方法，为(W, Mo)C基纳米无粘结相表面“反形貌”微织构刀具的开发和应用提供理论支撑。

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，项目制备了纳米无粘结相(W,Mo)C基“反形貌”表面微织构刀具，考察其高速干切削性能。系统研究了Al2O3/La2O3/ (W,Mo)C纳米复合刀具材料的制备，探讨了Al2O3和La2O3对(W, Mo)C基刀具材料微观组织、力学性能的影响规律，阐明了其强韧化机制；结合激光加工和放电等离子烧结技术制备“反形貌”表面微织构形貌，分析了表面微织构对(W, Mo)C基刀具材料摩擦性能的影响，优化表面微织构，揭示其耐磨减摩机理；研究了具有表面微织构纳米(W, Mo)C基刀具的高速干切削性能，建立Al2O3/La2O3/(W,Mo)C刀具表面微织构、力学性能与刀具高速干切削性能间的关系模型，探索优化 (W,Mo)C基刀具高速干切削性能的理论与方法，为(W,Mo)C基纳米无粘结相表面“反形貌”微织构刀具的开发和应用提供理论支撑。