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Development of B6O-based materials for wear applications

开发用于磨损应用的 B6O 基材料

基本信息

批准号：
231419978
负责人：
Professor Dr. Hans-Joachim Kleebe
金额：
--
依托单位：
Institut für Angewandte Geowissenschaften (IAG)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/231419978?language=en
关键词：
Development B6O based materials wear

项目摘要

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.

B6O材料是开发新型超硬耐磨材料的有前途的候选材料。在先前的工作中，申请人已经发现，烧结添加剂提供了通过FAST/SPS（火花等离子体烧结）或HIP（热等静压）进行B6O的可再现的液相辅助致密化的可能性。对于可重复的致密化和定制所产生的材料性能，必须了解致密化过程中发生的过程并开发这些材料的微观结构-性能关系。在拟议的项目中，将制备具有不同添加剂成分并在不同烧结条件下使用的 B6O 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开发的微观结构（即 B6O 晶粒中的平面缺陷，这被认为是导致 B6O 材料中出现异常晶粒生长的原因）与测量的机械性能的相关性，特别是硬度和断裂韧性，已知它们是控制材料耐磨性的主要性能。预计，对当前未解决的有关增韧机制的问题以及观察到的多晶 B6O 材料与单晶数据相比硬度下降的问题的基本了解将产生能够定制微观结构的工具，从而产生具有可调节性能的 B6O 材料。