论文部分内容阅读
铝及其合金是一种比重小。导电性能较好的材料,在电缆生产中,如果采用铝及其合金,则可以节约大量铜材。我国铝藏量又十分丰富,因而以铝代铜具有重要的经济意义、但是由于铝的钎焊比较困难,这就使铝的广泛应用受到一定的限制。铝钎焊的主要困难,在于铝表面有一层硬而难溶化的氧化膜,它阻碍了焊料与纯金属表面的接触。将一块铝板表面的氧化膜刮掉,不到一秒钟,便立即在其新表面上又生成一
Aluminum and its alloys are a small proportion. Good conductivity of the material in the cable production, if the use of aluminum and its alloys, you can save a lot of copper. Since the amount of aluminum deposits in our country is very rich, it is of great economic significance to use aluminum as a substitute for copper. However, due to the difficulty in brazing aluminum, the widespread application of aluminum is subject to certain restrictions. The main difficulty with aluminum brazing is that the aluminum surface has a hard and insoluble oxide film that hinders the contact of the solder with the pure metal surface. A piece of aluminum surface scraping off the oxide film, less than a second, it immediately on its new surface and generate a