The Mechanical Properties of Single Crystal Diamond

单晶金刚石的机械性能

• 批准号: 1948705
• 金额: --
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1948705
• 关键词: Mechanical; Properties; Single; Crystal; Diamond

The aim of the research is to understand the effects of crystal defects on the mechanical properties of diamond. Diamond is used in a variety of industrial applications that exploit its hardness and resistance to wear. During the growth of synthetic diamond, defects are incorporated into the crystal structure and the concentration of these defects depends of the growth conditions. It is important to know the effects these defects are having so that the growth method can be chosen appropriately for a given application.The methods used are principally experiments quantifying the wear of different types of diamond under a variety of wear conditions and understanding the underlying mechanism. An example of this is the study of the wear rate under erosive conditions where the material is subjected to repeated impacts from solid particles. The mechanisms for mass removal have been studied using a variety of microscopic techniques and the potential role point defects can play in this mechanism has been investigated. We are currently extending these methods to a range of environmental conditions such as raised temperatures.Methods for the controlled fracture of millimetre sized samples have also been developed for the purpose of studying fracture surfaces. The effects of defects on these fracture surfaces at an atomic length scale is being investigated to tie in to wear test results. We are also working with collaborators carrying out multiscale modelling using high performance computing to study the same material system. We hope to be able to help develop and validate those techniques so they can be used on other systems in future.

该研究的目的是了解晶体缺陷对金刚石机械性能的影响。金刚石被用于各种利用其硬度和耐磨性的工业应用。在合成金刚石的生长过程中，缺陷被纳入晶体结构中，并且这些缺陷的浓度取决于生长条件。重要的是要了解这些缺陷所产生的影响，以便可以针对给定的应用适当地选择生长方法。所使用的方法主要是实验，量化不同类型金刚石在各种磨损条件下的磨损并了解潜在的机制。这方面的一个例子是研究侵蚀条件下的磨损率，其中材料受到固体颗粒的反复冲击。已经使用各种显微技术研究了质量去除的机制，并且研究了点缺陷在该机制中可以发挥的潜在作用。我们目前正在将这些方法扩展到一系列环境条件，例如升高的温度。出于研究断裂表面的目的，还开发了毫米尺寸样品的受控断裂方法。正在研究原子长度尺度上缺陷对这些断裂表面的影响，以与磨损测试结果相结合。我们还与合作者合作，使用高性能计算进行多尺度建模，以研究相同的材料系统。我们希望能够帮助开发和验证这些技术，以便将来将它们用于其他系统。