High-Speed Biphase Microdrops

陶瓷、碳化物和氮化物等有前途的新材料的技术进步受到缺乏良好加工方法的阻碍。研究人员计划开发一种基于高速微液滴冲击的新型加工方法。水滴的冲击具有惊人的巨大侵蚀作用。这种现象可以用靶内的应力比液体的滞止压力大20多倍这一事实来解释。分析研究预测，通过加入第二相的气体或固体，可以达到更高数量级的应力。基于以往对超细（纳米级）颗粒断裂和微滴高速冲击切割效果的研究经验，研究人员计划将高速双相微滴应用于材料的去除和粉碎，以及双相微滴冲击产生的有毒难降解化学品的声化学破坏。第一个目标是证明这种新刀具加工难加工材料的可行性。另一个目标是调查在销毁有毒和难以销毁化学品方面的潜在应用。

The progress of the technology of promising new materials like ceramics carbides and nitrides is impeded by a lack of good methods to machine them. The researchers plan to develop a novel machining method based on the impact of very highspeed microdroplets. Water drop impact has a surprisingly large erosive effect. This phenomena can be explained by the fact that the stresses in the target are over twenty times larger than the stagnation pressure of the liquid. Analytical studies predict that, by adding a second phase of gas or solid, orders of magnitude still higher stresses can be reached. Based upon previous research experiences on the fracture of ultrasmall (nanoscale) particles and on the cutting effects of microdrops impacts at high velocity, the researchers plan to apply high-speed biphase microdrops for material removal and comminution, and for sonochemical destruction of toxic refractory chemicals produced by biphase microdrop impact. The first objective is to demonstrate the feasibility of this new tool for machining difficult to work materials. A further objective is to investigate potential application to the destruction of toxic and difficult to destroy chemicals.