Novel Structural Materials Through Microstructural Control in Liquid Phase Sintering

通过液相烧结微观结构控制的新型结构材料

• 批准号: 9301271
• 负责人: Randall German
• 金额: $ 25.6万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9301271&HistoricalAwards=false
• 关键词: Novel; Structural; Materials; Through; Microstructural

This proposal examines microstructural evolution during supersolidus liquid phase sintering (SLPS). This is a densification technique for powdered metals in which liquid forms along grain boundaries causing particle disintegration, capillary- induced rearrangement of grains, and solution reprecipitation. Included are considerations of the nature of liquid flow and the particle disintegration mechanism related to initial particle composition, cooling rate, and microstructure. Process variables include temperature, particle size, heating rate, and pre-sinter annealing. Factors affecting the sintering behavior include wetting, pore filling, liquid film migration, and compact densification. Several characterization techniques (optical and electron microscopy, dilatometry, and differential thermal analysis are employed to study the microstructural evolution and influence of processing variables). Sintering maps that show the significant parameters are an output of the research. %%% This process offers near net-shape forming capability for high quality parts. Potential applications include steam turbine blades, engine components, and tool steels.

该提案研究了超固相线液相烧结（SLPS）过程中的微观结构演变。 这是一种粉末金属致密化技术，其中液体沿着晶界形成，导致颗粒分解、毛细管诱导的颗粒重排以及溶液再沉淀。 其中包括对液体流动性质以及与初始颗粒成分、冷却速率和微观结构相关的颗粒崩解机制的考虑。 工艺变量包括温度、颗粒尺寸、加热速率和烧结前退火。 影响烧结行为的因素包括润湿、孔隙填充、液膜迁移和致密化。 采用多种表征技术（光学和电子显微镜、膨胀测量法和差热分析）来研究微观结构演变和加工变量的影响。 显示重要参数的烧结图是研究的成果。 %%% 该工艺为高质量零件提供近净形成型能力。 潜在应用包括蒸汽涡轮叶片、发动机部件和工具钢。