The use of cryogenic nitrogen gas jet to reduce the temperature of cutting zone and to avoid oxidation wear of tool in high speed milling titanium alloy was presented.
为降低切削区温度、防止刀具的氧化磨损，提出在低温氮气射流条件下进行钛合金的高速铣削加工。
A conventional thermos isn't good enough, but a Dewar flask, invented in the 19th century, holds cryogenic fluids like liquid nitrogen at temperatures of -196oc (-321of) for months at a time.
传统的恒温器不够好，但是19世纪发明的Dewar flask一次能保持像液态氮这样的温度在- 1960华氏摄氏度的低温液体好几个月之久。
Nitrogen is produced at air separation plants by liquefaction of atmospheric air and separation of the nitrogen by distillation. The nitrogen is then recovered as a cryogenic liquid.
在空气分离工厂，通过空气液化和蒸馏分离出氮。接着氮作为低温液体回收。
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