US-Sweden Planning Visit: Laser/Waterjet Processing of Cubic and Wurtzite Boron Nitride to Exceed the Hardness of Diamond

美国-瑞典计划访问：激光/水射流加工立方氮化硼和纤锌矿氮化硼，使其硬度超过金刚石

• 批准号: 1427708
• 负责人: Pranav Shrotriya
• 金额: $ 1.69万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1427708&HistoricalAwards=false
• 关键词: US; Sweden; Planning; Visit; Laser

This project will initiate a new international collaboration between researchers at Iowa State University, USA and Lund University, Sweden to design micro-structured materials that are harder than diamond and also more chemically stable. Such materials are likely to have numerous industrial applications, especially in machining tools. Single and polycrystalline diamonds are the hardest known materials; however, at high temperatures, diamond loses its chemical inertness and thermal stability. In contrast, cubic boron nitride (cBN) has exceptional chemical and thermal stability but has much lower hardness. Increasing the hardness of BN to the level of diamond is expected to allow BN materials to outperform diamond-based tool materials in corrosive and high temperature environments. The development and cost-effective processing of ultra-hard synthetic BN has the potential to revolutionize the manufacturing industry because of the superior chemical and thermal stability of BN materials compared to current state-of-art diamond tools. For example, ultra-precision machining of hardened steel dies and molds using the hardest BN tool could produce optical quality surfaces and ultra-fine tolerances, allowing expensive polishing operations to be eliminated while improving form accuracy. This planning visit will explore the effects of a novel laser/waterjet process on two phase cubic boron nitride/wurtzite boron nitride materials (cBN/wBN) to determine if the treatment leads to BN that exceeds the hardness of diamond. The laser/waterjet process was developed at Iowa State University in collaboration with researchers at Lund University who are leading experts in synthesis and characterization of cubic/wurtzite Boron Nitride. The planning visit is expected to initiate work on a number of different research directions, including designing processing conditions that result in desired microstructures for hardness enhancement, understanding the effects of laser heating and waterjet quenching on microstructures in cBN/wBN, assessing the influence of ultra-hard BN tool materials on high speed machining of ferrous alloys, and determining how the BN microstructures influence the chemical and mechanical properties of cBN/wBN. Overall this collaborative research effort will enable greater understanding of structure-property correlations in ultra-hard materials.The grant will support a planning visit by the PI, Shrotriya, and a US graduate student. The graduate student will spend approximately a month in Sweden performing proof of concept research that is likely to result in developing larger research proposals to the NSF division of Civil, Mechanical and Manufacturing Innovation in the Engineering directorate as well as the Division of Materials Research in the Math and Physical Sciences Directorate.

该项目将在美国爱荷华州立大学和瑞典的隆德大学进行新的国际合作，以设计比钻石更难且化学更稳定的微型结构材料。这样的材料可能具有许多工业应用，尤其是在加工工具中。单一和多晶钻石是最难的材料。但是，在高温下，钻石失去了其化学惰性和热稳定性。 相比之下，立方硼（CBN）具有出色的化学和热稳定性，但硬度低得多。将BN的硬度提高到钻石水平有望使BN材料在腐蚀性和高温环境中的表现优于基于钻石的工具材料。由于与当前的最先进的钻石工具相比，由于BN材料的卓越化学和热稳定性，超硬合成BN的开发和具有成本效益的处理有可能改变制造业。例如，使用最坚硬的BN工具对硬化钢模具和模具进行超精确加工可以产生光学质量表面和超细公差，从而可以消除昂贵的抛光操作，同时提高形式的准确性。 这次计划访问将探讨新型激光/水剥水过程对两相氮化硼/wurtzite氮化硼材料（CBN/WBN）的影响，以确定治疗是否导致BN是否超过了钻石的硬度。 激光/水剥水过程是在爱荷华州立大学与隆德大学的研究人员合作开发的，隆德大学是立方/Wurtzite硝化物的合成和表征专家。 预计计划访问将在许多不同的研究方向上发起工作，包括设计处理条件，从而导致所需的微观结构，以增强硬度，了解激光加热和水剥离淬火对CBN/WBN微观结构的影响，以评估Ultra Ultra的影响 - 基准BN工具材料有关高速合金加工的材料，并确定BN微结构如何影响CBN/WBN的化学和机械性能。总的来说，这项合作研究工作将使对超硬材料的结构 - 质地相关性有更深入的了解。该赠款将支持PI，Shrotriya和美国研究生的计划访问。研究生将在瑞典花费大约一个月的时间进行概念验证研究，这很可能导致工程局的民用，机械和制造创新部门以及在工程局的民用，机械和制造创新部以及材料研究部的NSF部门开发更大的研究建议。数学和物理科学局。