Development of B6O-based materials for wear applications

b60材料是开发新型超硬耐磨材料的有前途的候选材料。在之前的工作中，申请人已经发现烧结添加剂提供了通过FAST/SPS（火花等离子烧结）或HIP（热等静压）可重复液相辅助致密化b60的可能性。对于可重复的致密化和裁剪所产生的材料性能，了解致密化过程中发生的过程以及开发这些材料的微观结构-性能关系是至关重要的。在该项目中，将制备不同添加剂成分和不同烧结条件下的b60材料，并对其微观结构和由此产生的机械性能进行表征。本研究的主要范围是发育的微观结构（即b60晶粒中的平面缺陷，这被认为是导致b60材料中出现异常晶粒生长的原因）与测量的力学性能之间的相关性，特别是硬度和断裂韧性，这是已知的控制材料耐磨性的主要性能。预计，对目前尚未解决的有关发生的增韧机制的问题的基本理解，以及与单晶数据相比观察到的多晶b60材料硬度下降，将导致能够定制微观结构的工具，从而使b60材料具有可调节的性能。

B6O materials are a promising candidate for the development of new superhard and wear-resistant materials. In prior works the applicants have discovered that sintering additives offer the possibility for a reproducible liquid phase-assisted densification of B6O by FAST/SPS (Spark Plasma Sintering) or HIP (hot-isostatic pressing). For the reproducible densification and the tailoring of the resulting material properties, it is essential to understand the processes taking place during densification and to develop microstructure-properties relationships for these materials. In the proposed project, B6O materials with different additive compositions and under the use of different sintering conditions will be prepared and characterized in respect to their microstructure and the resulting mechanical properties.The main scope of this study is a correlation of the developed microstructure (i.e. planar defects in B6O grains which are supposed to be responsible for the occurrence of abnormal grain growth in B6O materials) with the measured mechanical properties, in particular the hardness and the fracture toughness which are known to be major properties for controlling the wear resistance of materials. It is expected that a fundamental understanding of the currently unsolved questions regarding the occurring toughening mechanisms and the observed decrease of the hardness of polycrystalline B6O materials in comparison to single crystal data will result in tools which allow a tailoring of the microstructure and thus B6O materials with adjustable properties.