推荐回答(4个)
VAC代表交流电压。其中V是电压的单位,表示电压;AC代表交流电。
如果是VDC,则代表直流电压。其中V仍然是电压的单位,表示电压;而DC则代表的是直流电。
伏交流电压(VAC,Voltage of Alternating Current),日常用电的电压为220VAC,即220伏交流电压
Fomblin Y VAC 3 润滑油脂:
是纯白色油脂, 显着地适合于润滑机械零件, 用于高真空, 化学腐蚀和氧气接触.Y VAC 3长寿润滑油,用于要求边界润滑(极压)特性.四球式极压润滑剂试验焊点620 Kg.Y VAC 3适合于润滑承受高热机械力的机械零件润滑.YVAC 3长寿润滑油有非常高的工作温度(from -20 to 200 ℃),因此, 广泛地应用于制造业,航空工业和电机工业.
Fomblin VAC 3是一种以PTFE作增稠剂的全氟真空润滑脂。产品均匀,不活泼,呈白色,特别适合用于真空润滑机械部件或封铅,以及同侵蚀性化学物品或氧气接触。 VAC3常用于“终身”润滑领域;它的润滑性使其适于边界(极压)润滑,温度范围为-20 至250 。 VAC3调制符合MIL-G-27617 III型的规格和 NASA/GSFC的 ASTM E-595-77测试方法(真空环境下的极低溢气性)。在决定选用真空润滑脂以前,请确定了解一些VAC3高真空润滑脂的其它讯息和说明书。
Vac3广泛用于电子显微镜实验室,这是因为虽然该润滑脂的液体部分最终会蒸发,但蒸气不会聚合。与烃类润滑脂不同,蒸发的碳氟化合物,不会被显微镜柱中的电离辐射而聚合。因此,使用非烃类润滑脂的用户通常环境更清洁,污染更少。烃类润滑脂蒸发的时候,往往聚合,最终在显微镜零件、缝隙和取样器上都形成一层漆膜(如污染物)。 温度使用范围∶ 人们可能指望润滑脂在-20° C至+250° C都能保持优良的性能。事实上,人们可以在较低温度下使用润滑脂,但其性能至少会一定程度的减弱。 显然,在电子显微镜应用中,温度范围是足够了。
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