STTR Phase II: Nano-Layered Composites as High-Temperature Hard Coatings

STTR 第二阶段：纳米层状复合材料作为高温硬质涂层

• 批准号: 0091559
• 负责人: Ilwon Kim
• 金额: $ 50万
• 依托单位: APPLIED THIN FILMS INC
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-15 至 2002-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0091559&HistoricalAwards=false
• 关键词: STTR; Phase; II; Nano; Layered

This Small Business Technology Transfer (STTR) Phase II Project aims to develop novel nano-layered coatings for high-temperature tribological applications, specifically cutting-tool coatings that perform well at elevated temperatures (up to 1000 degrees C). There is a high level of interest in these coatings because of the desire to cut at higher rates and due to increasing environmental concerns over the use of coolants during machining. Traditional coating materials do not perform well under these conditions, primarily because their hardnesses decrease rapidly as temperature rises. Research in Phase I developed a new class of coatings, combining many alternating nanometer-thick layers of metals and nitrides, which show substantial hardness enhancements. Hardnesses up to 44 gigapascals (GPa) were maintained after high temperature annealing, demonstrating the feasibility of these new materials as high-temperature stable coatings. Strong dislocation confinement in nano-layers is likely to yield higher high-temperature hardness than in monolithic coatings, providing improved wear resistance. In Phase II, nano-layered coatings will be developed that optimize key properties including hardness, thermal expansion match with the substrate, stability against dissolution into different workpieces, and oxidation resistance. Nano-layered coated cutting tools have the potential to make dry-cutting a practical alternative, and to improve wet-machining performance.

这个小型企业技术转移（STTR）II期项目旨在开发用于高温摩擦学应用的新型纳米层涂料，特别是在高温下（最高1000度C）表现良好的切割型涂料。 由于渴望以更高的速度削减，并且由于对加工过程中使用冷却剂的使用引起了人们的关注，因此对这些涂料有很高的兴趣。在这些条件下，传统的涂料材料的性能不能很好，主要是因为它们的硬度随着温度的升高而迅速降低。 第一阶段的研究开发了一类新的涂料，结合了许多交替的纳米厚金属和硝酸盐层，这些层表现出很大的硬度增强。高温退火后保持了高达44 gigapascals（GPA）的硬度，表明这些新材料是高温稳定涂料的可行性。纳米层中强的脱位限制可能会产生比整体涂层相比，可产生更高的高温硬度，从而提高了耐磨性。在II期中，将开发纳米层涂层，以优化关键特性，包括硬度，热膨胀与底物匹配，稳定性抗溶解成不同工件以及氧化阻力。纳米层涂层切割工具有可能使干切割成为实用的替代方案，并提高湿润的性能。