Synthesis and Characterization of the 312 and H-Phases

312 相和 H 相的合成和表征

• 批准号: 9705237
• 负责人: Michel Barsoum
• 金额: $ 35.74万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-01 至 2000-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9705237&HistoricalAwards=false
• 关键词: Synthesis; Characterization; 312; Phases

9705237 Barsoum The proposed research will study the physical properties of two new classes of ceramic material. The two classes are the `312' and the `H-phase' (M3BC2 and M2BX, respectively, where M is a transition metal, B is a group B-element such as Si, Al, Ge, Sn, Pb, In, Ga, and X is either carbon or nitrogen). Both classes have layered hexagonal structures, with alternating close-packed layers of the B-group elements and transition metal carbides (or nitrides). These materials were first identified in the late sixties, but then were ignored until recent preliminary work by the PI and his group showed that they had unusual properties. They have high thermal and electrical conductivity, are not susceptible to thermal shock, and are machinable like metals. Like ceramics, they are refractory and oxidation resistant. Fully dense, single phase, bulk samples of a variety of compositions will be fabricated and characterized to determine the elastic, thermal, and electrical properties of these compounds as a function to temperature and anisotropy. The objective of the research is to better understand the nature of the bonding in these compounds, especially that between the B-group elements and the transition metal carbide or nitride layers. %%% These two new classes of ceramics will be examined for their physical properties. These materials were first identified in the late sixties, but then were ignored until recent preliminary work by the PI and his group showed that they had unusual properties. They have high thermal and electrical conductivity, are not susceptible to thermal shock, and are machinable like metals. Like ceramics, they are refractory and oxidation resistant. These materials have a variety of potential structural and functional applications. ***

9705237 BARSOUM拟议的研究将研究两种新类陶瓷材料的物理特性。这两个类别是`312'和`h-phass'（分别为m3bc2和m2bx，其中m是过渡金属，b是b元素，例如si，al，al，ge，ge，ge，sn，pb，in，in，in，in，in，in，in，in，in，in ga，x是碳或氮）。 这两个类都均分层六边形结构，并具有交替的B组元件的封闭层和过渡金属碳化物（或氮化物）。 这些材料在六十年代后期首先被确定，但随后忽略了PI和他的小组最近的初步工作，表明它们具有不寻常的特性。 它们具有较高的热电导率和高电导率，不容易受到热冲击的影响，并且像金属一样可加工。 像陶瓷一样，它们具有耐火性和抗氧化性。 将制造和表征各种组合物的完全致密的单相，大量样品，以确定这些化合物的弹性，热和电性能是温度和各向异性的功能。 该研究的目的是更好地理解这些化合物中键合的性质，尤其是在B组元素和过渡金属碳化物或氮化物层之间。 %% %%这两个新类别的陶瓷将检查其物理特性。这些材料在六十年代后期首先被确定，但随后忽略了PI和他的小组最近的初步工作，表明它们具有不寻常的特性。它们具有较高的热电导率和高电导率，不容易受到热冲击的影响，并且像金属一样可加工。 像陶瓷一样，它们具有耐火性和抗氧化性。 这些材料具有多种潜在的结构和功能应用。 ***