Diamond Film Generation from a Combustion Jet

该项目旨在开发一种方法， 金刚石薄膜的燃烧火焰生产;该方法 在复杂表面上沉积大面积薄膜潜力 形状. 在这项工作中，火焰将在一个 产品随后膨胀的燃烧室 火焰气体通过会聚-发散喷嘴以形成 超音速射流将被引导到基底上， 沉积所需的膜。 这种方法有 缓解以前与以下方面有关的问题的潜力 金刚石膜沉积的不均匀性差和高 通过控制化学物质来控制谷物杂质水平 反应和运输现象，从而导致有效的 燃烧产生的活性物质的均匀利用 生产优质金刚石薄膜的品种。 的 这种方法的基本原则是： 富燃料燃烧产物云的活性部分 （其中含有高水平的物种，导致钻石 沉积）;冻结云中的化学物质， 喷嘴快速膨胀过程;输送这种“冻结”流 快速涂到待涂的表面;修改 均匀性/成分/温度以最佳方式， 过境;并建立一个薄，均匀的边界层， 活性物质可以扩散通过的衬底表面 撞击生长中的金刚石膜。 所提出的应用燃烧生成金刚石的方法 电影将极大地影响潜在的十亿美元 市场 当完善后，这项新技术将提供一个 一种实用、便携、低成本的金刚石涂敷方法 涂料到各种材料，如机床， 电子零件

This project is aimed at development of a method for combustion- flame production of diamond films; this method has the potential for deposition of large area films on complex shapes. In this work, flames will be supported in a combustion chamber wivh subsequent expansion of the product flame gases through a converging-diverging nozzle to form a supersonic jet which will be directed against a substrate for deposition of the desired films. This approach has the potential to mitigate previous problems associated with diamond-film deposition such as poor uniformity and high levels of grain impurities via control of the chemical reactions and transport phenomena, thus leading to efficient and uniform utilization of the combustion-generated active species in production of high-quality diamond films. The basic principles involved in this approach are: isolate the active portion of the fuel-rich combustion product cloud (which contains high levels of species which lead to diamond deposition); freeze the chemistry in that cloud through the rapid nozzle expansion process; transport this "frozen" stream rapidly to the surface to be coated; modify the uniformity/composition/temperature in an optimum fashion in transit; and establish a thin, uniform boundary layer at the substrate surface across which the active species can diffuse to strike the growing diamond film. The proposed method for applying combustion-generated diamond films will significantly impact a potential billion dollar market. When perfected, this new technique will provide a practical, portable, low-cost method of applying diamond coatings to materials as diverse as machine tools and electronic parts.