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首页> 外文会议>Society for Machinery Failure Prevention Technology Meeting; 20050418-21; Virginia Beach,VA(US) >SUPERSONIC PARTICLE DEPOSITION FOR MILITARY APPLICATIONS
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SUPERSONIC PARTICLE DEPOSITION FOR MILITARY APPLICATIONS

机译：用于军事用途的超音速颗粒沉积

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摘要

This paper will discuss an emerging technology 'Supersonic Particle Deposition (SPD)" commonly referred to as 'cold spray' and its possible use as a metal deposition technique to form wear and corrosion resistant coatings for DOD applications. Cold spray is a material deposition process whereby metal powder particles are utilized to form a coating or a free-standing structure by means of ballistic impingement upon a suitable substrate. Conventional methods of surface preparation of the substrate, such as grit blasting, which are necessary for thermal spray processes, are often not required for cold spray. In the cold spray process, metal powder particles are accelerated by a supersonic stream of compressed gas. The spray nozzle design incorporates the use of a converging-diverging throat through which the preheated gas stream is expanded to attain supersonic velocities, with an accompanying decrease in temperature. The informal term "cold spray" arose due to the relatively low temperatures of the expanded gas and particle stream that exits the nozzle. The advantages of cold spray over current and emerging technologies are to be realized in terms of economics, environmental compliance and performance. Cold spray coatings offer certain advantages over those applied by conventional thermal spray techniques in that they can contain less oxidation since they are applied below the melting temperature and do not experience the effects of thermal stress as a result of resolidification. In addition, some cold spray coatings have been shown to adhere to the substrate by a solid state bonding mechanism having much higher bond strengths.
机译：本文将讨论一种新兴技术“超音速颗粒沉积（SPD）”（通常称为“冷喷涂”）及其可能用作金属沉积技术以形成DOD应用中的耐磨和耐腐蚀涂层的方法。因此，金属粉末颗粒可通过在合适的基材上进行弹道冲击而形成涂层或自立结构基材表面的常规表面处理方法（例如喷砂处理）通常是热喷涂工艺所必需的在冷喷涂过程中，金属粉末颗粒通过超音速压缩气体流而加速，喷嘴设计结合了使用会聚-发散的喉部，通过该喉部可扩展预热的气流以达到超音速。伴随着温度的降低，非正式的术语“冷喷雾”是由于相对较低的温度引起的离开喷嘴的膨胀气体和颗粒流的数量。冷喷涂相对于现有技术和新兴技术的优势将在经济性，环境合规性和性能方面实现。与传统的热喷涂技术相比，冷喷涂涂层具有某些优势，因为它们可以在较低的熔融温度下使用，并且由于再固化不会受到热应力的影响，因此可以减少氧化。另外，已经显示出一些冷喷涂涂层通过具有高得多的结合强度的固态结合机理粘附到基底上。

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