Development of a Cubic-Anvil Experimental Facility for High Pressure and Current Sintering of Bulk Nanocrystalline Materials

块体纳米晶材料高压电流烧结立方砧实验装置的研制

• 批准号: 9704237
• 负责人: Charles Lesher
• 金额: $ 18.08万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-01 至 1999-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9704237&HistoricalAwards=false
• 关键词: Development; Cubic; Anvil; Experimental; Facility

9704237 Lesher This award provides support to acquire equipment for the fabrication of large volume parts of materials with nanocrystalline microstructure for mechanical testing and thermodynamic studies. The backbone of this new fabrication system will be the cubic-anvil apparatus. The multianvil payload isdriven by a 1000-ton uniaxial hydraulic press equipped with automated pressure and temperature control for tailored processing. This equipment is unique in combining ultrahigh pressure (up to 5 Gpa) and large sample capacity (5-10 cc) of the payload with resistance and pulsing direct current heating adapted from current plasma activated sintering systems. The recovery of large nanocrystalline samples using this apparatus offers new research opportunities to examine sintering behavior, to determine mechanical properties, and to characterize thermodynamic properties of a wide range of nanocrystalline ceramic and metallic materials. %%% This project reflects a multidisciplinary collaboration on the UC Davis campus involving faculty, researchers and students in materials science, chemistry, and geology. This new facility will greatly enhance research programs currently supported by NSF to characterize nanocrystalline ceramics (Al2O3, AlN, Si3N4, SiC) and metals (W, Fe, Ni), and various nanocomposites (Al2O3-Sic, Al2O3-ZrO2, Al2O3-diamond, Si3N4-SiC, Ni-Al2O3). New investigations requiring the large sample volume capabilities of the cubic-anvil apparatus will include tensile strength and fracture toughness measurements, and enthalpy determinations by solution and high temperature calorimetry. We anticipate the results of these studies will contribute fundamentally to our understanding of nanocrystalline structures, mechanical and thermodynamic properties, as well as processing parameters essential to the eventual development of large-scale fabrication of durable ceramic composites and monoliths for technological applications ***

9704237莱瑟尔本奖项提供支持，用于购买用于机械测试和热力学研究的具有纳米晶微结构的大量材料零件的制造设备。这一新的制造系统的主干将是三面顶锤设备。多座有效载荷由1000吨单轴液压机驱动，配备自动压力和温度控制，可进行量身定制的加工。该设备独一无二地将超高压(高达5 GPA)和有效载荷的大样本容量(5-10毫升)与电阻和脉冲直流加热相结合，适用于当前的等离子活化烧结系统。利用该装置回收大尺寸纳米晶样品，为研究各种纳米晶陶瓷和金属材料的烧结行为、确定机械性能和表征热力学性能提供了新的研究机会。这个项目反映了加州大学戴维斯分校的多学科合作，涉及材料科学、化学和地质学的教职员工、研究人员和学生。这一新设施将极大地加强目前由NSF支持的研究项目，这些项目旨在表征纳米晶陶瓷(Al_2O_3、AlN、Si3N_4、碳化硅)和金属(W、Fe、Ni)，以及各种纳米复合材料(Al_2O_3-碳化硅、Al_2O_3-ZrO_2、Al_2O_3-钻石、Si3N_4-碳化硅、Ni-Al_2O_3)。新的研究需要大样本容量的三面顶锤装置，包括抗拉强度和断裂韧性测量，以及用溶液和高温量热法测定热容。我们预计，这些研究的结果将有助于我们对纳米晶体结构、机械和热力学性质的理解，以及最终开发用于技术应用的耐用陶瓷复合材料和整体的大规模制造所必需的工艺参数。