SBIR Phase I: Preparation of Ultrapure Aluminum Nitride from a Preceramic Lewis Acid-Base Adduct Synthesized in an Ambient Temperature Chloroaluminate Molten Salt

SBIR第一阶段：由常温氯铝酸盐熔盐中合成的陶瓷前体路易斯酸碱加合物制备超纯氮化铝

• 批准号: 9660631
• 负责人: Michael Carter
• 金额: $ 7.5万
• 依托单位: Eltron Research, Inc.
• 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: 1997-01-01 至 1997-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9660631&HistoricalAwards=false
• 关键词: SBIR; Phase; Preparation; Ultrapure; Aluminum

*** 9660631 Carter This Phase I Small Business Innovation Research project addresses the bulk synthesis of aluminum nitride (A1N) precursors utilizing acid-base chemistry in an ambient temperature chloroaluminate molten salt. The molten salt is composed of a mixture of aluminum chloride (AlCl3) and trimethylphenylammonium chloride (TMPACl) which forms a liquid tetrachloroaluminate below room temperature. AlN precursors will be formed as Lewis acid-base adducts containing 1:1 ratios of Al to N. Precursor stoichiometry will be fixed by the inherent nature of the Lewis acid-base interaction between nitrogenous bases such as ammonia and hydrazine and heptachlorodialuminate, the predominant Lewis acid in acidic melts. The proposed approach differs from those relying on formation of a polymeric precursor in that it will result in easily handlable solid preceramic materials of the exact stoichiometry required in the final product. The preceramic material is prepared such that no carbide or oxide contamination is introduced into the final product. The proposed technology for production of bulk aluminum nitride in highly pure form will find use immediately in electronics applications, where A1N is used as a heat dissipation medium and substrate material. It is also used in non-electronic applications, e.g., evaporation boats. Annual production of A1N was approximately 120-130 tons in 1993. A substantial driving force exists, therefore, to find alternative, cost-effective methods to produce this material. ***

*9660631卡特这个第一阶段小型企业创新研究项目致力于在常温氯铝酸盐熔盐中利用酸碱化学方法大量合成氮化铝(A1N)前体。熔盐由氯化铝(AlCl3)和三甲基苯基氯化铵(TMPACl)的混合物组成，在室温下形成液体四氯铝酸盐。AlN前驱体将以Al与N之比为1：1的Lewis酸碱加合物的形式形成。前驱体的化学计量比将由氨、肼等氮碱与酸性熔体中的主要Lewis酸--七氯二铵酸之间Lewis酸碱相互作用的固有性质所固定。所提出的方法不同于那些依赖于形成聚合物前体的方法，因为它将产生易于处理的固体前驱体材料，其精确的化学计量比在最终产品中所需。制备陶瓷前材料时，不会在最终产品中引入碳化物或氧化物污染。拟议的高纯度块体氮化铝生产技术将立即用于电子应用，其中AlN被用作散热介质和衬底材料。它还用于非电子应用，例如蒸发船。1993年氮化铝的年产量约为120-130吨。因此，寻找替代的、成本效益高的方法来生产这种材料是一个巨大的驱动力。***