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New clad fin material with high post braze strength and excellent sagging resistance

机译：新型复合翅片材料，具有较高的后钎焊强度和出色的抗流挂性

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摘要

The thickness of fin materials is trending down as with other heat exchanger materials. Consequently, the fin stock materials need to have a higher post braze strength, better sagging resistance and better corrosion resistance. The main use for thin, clad fin stock is in condensers. Usually these are brazed relatively rapidly in the early stages of the brazing cycle and more slowly at the higher temperatures. This poses a challenge for thin clad fin materials. A longer time at higher temperatures gives more time for diffusion of silicon from the braze cladding into the core material. For these brazing cycles and thin gauges a more tolerant, clad fin material is needed. The new clad fin material from Sapa has the name SSR, "Strong, Sagging Resistant". This is a fin material with good elongation in the as-delivered temper for good formability. The SSR fins are available with four different zinc contents (0 - 2,5%) for tailor-made material system corrosion solutions. By careful selection, the brazed fins will develop a chosen corrosion potential in the range -730mV to -850mV. The resulting SSR corrosion performance is better than that for clad FA6815 fins with corresponding zinc contents. During brazing, the SSR fins are more tolerant of different brazing cycles than conventional clad fin materials and the sagging resistance is excellent. For example, in the sag test with a brazing cycle going from RT to 600℃ in 20 minutes and with a 3 minute dwell time and a beam length of 35 mm, a clad 70 urn SSR fin-stock sample typically sags only 10mm or less. A conventional material would sag 15 mm or more. In the post-braze condition the large grained material yield strength is 65 MPa and the tensile strength is 165MPa.
机译：翅片材料的厚度与其他热交换器材料一样呈下降趋势。因此，翅片原料需要具有更高的钎焊后强度，更好的抗流挂性和更好的耐腐蚀性。薄的复合翅片料的主要用途是在冷凝器中。通常，它们在钎焊循环的早期相对较快地钎焊，而在较高温度下较慢地钎焊。这对于薄的包覆翅片材料构成了挑战。在较高温度下更长的时间为硅从钎焊包层扩散到芯材中提供了更多时间。对于这些钎焊循环和薄规格，需要更宽容的复合翅片材料。 Sapa的新型复合翅片材料的名称为SSR，“坚固，抗流挂”。这是一种翅片材料，具有良好的延展性和良好的可成型性。 SSR散热片可提供四种不同的锌含量（0-2.5％），用于量身定制的材料系统腐蚀解决方案。通过仔细选择，钎焊翅片将在-730mV至-850mV的范围内产生选定的腐蚀电位。产生的SSR腐蚀性能优于具有相应锌含量的复合FA6815散热片。在钎焊过程中，SSR翅片比传统的复合翅片材料更能耐受不同的钎焊循环，并且其抗流挂性极好。例如，在下垂测试中，钎焊循环在20分钟内从室温升至600℃，停留时间为3分钟，光束长度为35 mm，熔覆70的SSR翅片通常仅下垂10mm或更小。传统材料会下垂15毫米或更多。在钎焊后条件下，大颗粒材料的屈服强度为65 MPa，抗拉强度为165MPa。

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