论文部分内容阅读
铝作为工业材料,其主要特征是重量轻,同时还具有较高的导热性(仅次于铜)。铜的导热率为3.86焦耳/厘米·秒·℃(50℃),铝的为2.23焦耳/厘米·秒·℃。约为铜的55％。而铁的导热率只有0.69焦耳/厘米·秒·℃,铝比铁的大得多,所以铝是热交换器的优良材料。而且铝还具有优良的加工性,例如,即使在大气中也能热轧成复合材料。多年来,利用铝的这个特性,大量采用铝作为热交换器的辅助材料,用以制造散热片。直到1940年,铝才开始用作热交换器的主体。随后英美两国采用浸渍钎焊法制造铝
Aluminum, as an industrial material, is characterized by its light weight and high thermal conductivity (after copper). The thermal conductivity of copper was 3.86 J / cmsec (50C) and that of aluminum was 2.23 J / cmsec. About 55% of copper. The thermal conductivity of iron is only 0.69 joules / cm · sec · ℃, aluminum is much larger than iron, aluminum is an excellent material for heat exchangers. Aluminum also has excellent processability, for example, hot-rolled into composite materials even in the atmosphere. Over the years, the use of aluminum has led to the extensive use of aluminum as an auxiliary for heat exchangers to make heat sinks. Until 1940, aluminum began to be used as the main heat exchanger. Britain and the United States followed by dip brazing aluminum