Fundamental Studies on Sintering of Alloys, Composites, and Coatings

合金、复合材料和涂层烧结的基础研究

• 批准号: 1462602
• 负责人: Sandip Harimkar
• 金额: $ 35.02万
• 依托单位: Oklahoma 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: 2015-08-01 至 2021-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1462602&HistoricalAwards=false
• 关键词: Fundamental; Studies; Sintering; Alloys; Composites

Sintering is the process of forming engineering components by heating material powder under pressure. Sintering processes are widely used for the manufacturing of metallic, ceramic, and composite components for automotive, aerospace, defense, and machine tool industries. However, it is often very challenging to sinter the components free from processing-related undesirable changes in structure and properties of materials. Controlling the structure of materials during sintering becomes particularly important for highly temperature-sensitive materials such as amorphous alloys. These materials are being considered for several applications due to their outstanding mechanical and electrochemical properties. This award supports fundamental research related to the development of sintering processes for the amorphous alloys and their composites and coatings. The results of this research will lead to innovations in the strategic area of advanced manufacturing of engineering materials, identified as a key to national economic development. The research will also promote the participation of diverse groups of students in manufacturing research. In spite of their attractive properties, actual utilization of amorphous alloys in practical applications has been limited primarily due to difficulties in processing of bulk shapes using conventional solidification processing. The spark plasma sintering process involving simultaneous application of pulsed direct current and uniaxial pressure offers interesting possibilities of manufacturing bulk amorphous alloys without undesirable changes in material structure. The research team will perform experiments to investigate the fundamental mechanisms of densification for the spark plasma sintering of bulk amorphous alloys, particle reinforced and laminated composites, and thick amorphous alloy coatings. The research will elucidate the mechanisms of evolution of nanocrystalline size distribution in amorphous alloys, ductility development in composites, and tribological corrosion behavior of amorphous composite coatings. The major objective is to establish the processing-microstructure-properties correlations in these areas of research. Successful completion of this research would significantly advance the state-of-the-art in spark plasma sintering of amorphous metallic alloys leading to wider industry acceptance of the sintering technology and engineered amorphous materials in a wide range of applications.

烧结是通过在压力下加热材料粉末来形成工程部件的过程。烧结工艺广泛用于汽车、航空航天、国防和机床行业的金属、陶瓷和复合材料部件的制造。然而，在烧结部件时避免与加工相关的材料结构和性能发生不良变化通常非常具有挑战性。对于非晶合金等高温度敏感材料来说，在烧结过程中控制材料的结构变得尤为重要。由于其出色的机械和电化学性能，这些材料被考虑用于多种应用。该奖项支持与非晶合金及其复合材料和涂层的烧结工艺开发相关的基础研究。该研究成果将带动工程材料先进制造战略领域的创新，被确定为国民经济发展的关键。该研究还将促进不同群体的学生参与制造研究。尽管非晶态合金具有吸引人的特性，但其在实际应用中的实际使用受到限制，这主要是由于使用传统凝固工艺处理块状形状的困难。火花等离子烧结工艺涉及同时施加脉冲直流电和单轴压力，为制造大块非晶合金提供了有趣的可能性，而不会导致材料结构发生不良变化。研究小组将进行实验，研究大块非晶合金、颗粒增强和层状复合材料以及厚非晶合金涂层的放电等离子烧结致密化的基本机制。该研究将阐明非晶合金中纳米晶尺寸分布的演化机制、复合材料延展性的发展以及非晶复合涂层的摩擦腐蚀行为。主要目标是建立这些研究领域的加工-微观结构-性能之间的关联。这项研究的成功完成将显着推进非晶态金属合金放电等离子烧结的最先进水平，从而使烧结技术和工程非晶态材料在广泛的应用中得到更广泛的行业接受。