Materials Synthesis and Processing: A Novel Technique of Net-Form Materials Synthesis

提出了一种新的网状材料合成方法， 设想的和初步的验证实验已经 圆满完成 该方法使用高度均匀的 熔融金属的液滴沉积在基底上， 受控环境，例如真空或更高的压力， 选择气体 控制液滴沉积速率，使得 快速凝固的发生导致网状材料 具有小的晶粒尺寸和高的结构完整性。 通过使用 新颖的液滴流产生技术 以非常小的角度和速度被引导到衬底上 分散体，从而使合成小的详细的 零件. 由于液滴大小相同（通常为30-150 微米直径）并以相同的速度行进， 最终产品中的预固化液滴导致更高的 均匀，因此比通常实现的部件质量更高 与其他相关技术。 由于凝固速率 决定了网状部件的结构完整性， 液滴沉积速率、速度和尺寸是 在研究中会有所不同。 均匀性和晶粒结构 的净形成的部分将进行检查，光学和 电子显微镜的使用，以及它们的机械 将通过对成型部件进行试验来研究其特性 在压缩和拉伸中。 将提案过程简化为实践， 直接从基于计算机的零件快速制造 描述。 所得到的部件也可以用新颖的， 高强度结构。

A novel method of net-form materials synthesis has been conceived and initial verification experiments have been successfully completed. The method uses streams of highly uniform droplets of molten metal which are deposited onto a substrate in a controlled environment such as a vacuum or higher pressures of selected gases. The droplet deposition rate is controlled such that rapid solidification occurs leading to a net-formed material with small grain size and high structural integrity. By using novel droplet stream generation techniques the droplets are directed onto the substrate with very small angular and speed dispersions thereby making possible the synthesis of small detailed parts. Since the droplets are the same size (typically 30-150 microns in diameter) and travel at the same speed, the absence of pre-solidification droplets in the final product leads to a more homogeneous, and thus higher quality part than is normally achieved with other related techniques. Since the solidification rate determines the structural integrity of the net-formed part, the droplet deposition rate, speeds, and sizes are parameters which will be varied in the study. The homogeneity and grain structure of the net-formed parts will be examined both optically and with the use of an electron microscope, and their mechanical characteristics will be studied by subjecting formed parts to tests in both compression and tension. The reduction of the proposal process to practice may allow the rapid fabrication of parts directly from computer-based descriptions. The resulting parts may also be produced with novel, high strength structure.