REDUCED MIST GENERATION WITH MIRCOPCM MACHINING COOLANTS

在过去的15年里，三角研究公司的研究人员和 开发公司（TRDC）开发了一系列重要的 用于飞机航空电子设备、宇宙飞船和 使用相变材料或微PCM的金属加工操作。 这些流体浆料利用了聚合物的高潜热容量。 微囊化石蜡，以显著增强热储存 和市售流体冷却剂的输送性能。 在NASA、USAF、NAVY、SDIO和NSF的SBIR计划中， 已经证明冷却剂可以提高流体的热容量， 到基础流体的性质的40倍或4,000%以上。 在 同时，观察到热传递系数增加 到3x或300%。 在第一阶段和第二阶段SBIR程序中， 在1990-94年，研究人员发现， 减少刀具磨损25%以上，表面温度降低15 百分之 他们还观察到， 由于冷却剂具有更高的热容量， 但当时并没有对这一现象进行进一步的研究。 目标 这项提议的努力是调查这一潜在的有利条件， 财产MicroPCM金属加工冷却剂的制备和使用 金属加工实验在公共卫生学院在北卡罗来纳大学教堂 之丘 微粒大小、水平和蒸发的微PCM的数量 然后，将冷却剂与不具有 高速车削实验中的颗粒。 虽然microPCM 颗粒现在用于服装，新的潜在毒性 还将研究高温下的冷却剂。 拟定商业应用： 通用汽车公司成为我们的第三阶段商业合作伙伴后，美国国家科学基金会 SBIR加工程序，并表明microPCM冷却剂是有用的， 磨削和车削操作。 开发上级和更安全的 金属加工冷却剂可以显著改善空气质量， 减少金属加工的蒸发损失 冷却剂 MicroPCM成本正在迅速下降，因为 在鞋类和服装中使用微型PCM。

Over the past 15 years, investigators at Triangle Research and Development Corporation (TRDC) have developed a series of significantly improved two-component coolants for aircraft avionics, spacecraft and metalworking operations using phase change materials or microPCMs. These fluid slurries utilize the high latent thermal capacitance of microencapsulated paraffins to significantly enhance the thermal storage and transport properties of commercially available fluid coolants. During SBIR programs for NASA, USAF, NAVY, SDIO and NSF, the new coolants have been demonstrated to enhance fluid thermal capacitance up to 40x or 4,000 percent above the property of the base fluid. At the same time, the heat transport coefficient was observed to increase up to 3x or 300 percent. In Phase I and II SBIR programs for machining with NSF in 1990-94, investigators found that the microPCM coolants reduced tool wear over 25 percent and surface temperatures by 15 percent. They also observed there was over 90 percent reduction in smoke or evaporated coolants because of their much higher heat capacity, but this phenomenon was not investigated further at that time. The goal of this proposed effort is to investigate this potentially advantageous property. MicroPCM metalworking coolants will be prepared and used in metalworking experiments in the School of Public Health at UNC-Chapel Hill. Particulate sizes, level and the quantity of evaporated microPCM coolants will then be compared to that of a control coolant without particles in high speed turning experiments. Although microPCM particles are now used in apparel, the potential toxicity of the new coolants at high temperatures will also be investigated. PROPOSED COMMERCIAL APPLICATION: General Motors became our Phase III commercial partner following the NSF SBIR machining program and showed that microPCM coolants were useful for grinding and turning operations. Development of superior and safer metalworking coolants could significantly improve air quality about machining operations and reduce the evaporated loss of metalworking coolants. MicroPCM costs are rapidly dropping because of the increased use of microPCMs in footwear and clothing.