铜铝钎焊用ZnAlCuRE高温软钎料研究

发布时间：2018-01-03 22:08

本文关键词：铜铝钎焊用ZnAlCuRE高温软钎料研究　出处：《河南科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国铜资源短缺现状愈发严峻,铜价不断上涨,铝代铜技术已成为缓解我国铜资源短缺现状的重要途径。有数据表明:21世纪,常用异种金属接头中铝铜接头将占到近5.8%。钎焊法是铜铝连接中较有优势的连接方法之一,钎焊法制备铜铝接头具有焊接变形小,焊接质量稳定可靠,钎焊设备简单,成本较低等优势及特点。为了实现和优化铜铝钎焊,推动铝代铜技术的进一步应用,本文选取综合性能优良的Zn9.3Al7Cu钎料为基体,通过加入微量混合稀土La Nd形成多元钎料合金,研究了添加元素La Nd对Zn9.3Al7Cu钎料合金物理性能(熔化温度、密度、电阻率、布氏硬度、显微硬度)、力学性能(抗拉强度、延伸率)、钎焊工艺性能(在Cu、Al基板上的铺展面积)及腐蚀性能(电化学腐蚀电位、腐蚀电流密度、全浸没腐蚀速率)的影响,进而优化合金成分,获得综合性能良好的合金配方。结果表明:随着稀土La Nd添加量的增加,Zn9.3Al7Cux La Nd钎料的熔点逐渐升高,但增加幅度有限,Zn9.3Al7Cu0.1La Nd钎料的固液相熔化区间较Zn9.3Al7Cu钎料降低了7℃,这对钎料的润湿性能有促进作用。Zn9.3Al7Cux La Nd钎料密度、电阻率均随着La Nd添加量的增加逐渐升高,其中钎料电阻率增幅较大,Zn9.3Al7Cu0.5La Nd钎料电阻率为0.2×10-6?m,较基体钎料(0.17×10-6?m)升高了11%。Zn9.3Al7Cux La Nd钎料布氏硬度及显微硬度随随着La Nd添加量的增加逐渐升高,当La Nd添加量为0.5%时,Zn9.3Al7Cu0.5La Nd钎料合金布氏硬度为88.7HB,较基体钎料(85.2HB)提高了4.1%,显微硬度为113.5HV,较基体(97.5HV)钎料提高了6.2%。稀土元素La Nd添加量对Zn9.3Al7Cu钎料在Cu、Al基板上的铺展性能影响较大,Zn9.3Al7Cu钎料在Cu、Al基板上的铺展面积分别为50.1mm2和253.2mm2,当La Nd添加量为0.1%时,Zn9.3Al7Cu0.1La Nd钎料在Cu、Al基板上的铺展面积最大,分别为60.3mm2和371.2mm2,较基体钎料分别增大了20.4%和46.6%;添加适量的混合稀土La Nd能提高钎料的抗拉强度和延伸率,Zn9.3Al7Cu钎料的抗拉强度和延伸率分别为287MPa和8.6%,Zn9.3Al7Cu0.3La Nd钎料的抗拉强度和延伸率最大,分别为307MPa和11.6%,较基体钎料分别增加了7%和11.6%。Zn9.3Al7Cux La Nd钎料的腐蚀电位随La Nd添加量的增加先升高后降低,但幅度不大,腐蚀电流随La Nd添加量的增加先降低后升高,Zn9.3Al7Cu0.3La Nd钎料的腐蚀电流较基体钎料降低了近一个数量级,此时钎料的抗腐蚀性最好;Zn9.3Al7Cux La Nd在3.5%Na Cl溶液中的腐蚀速率随着La Nd添加量的增加呈现先降低后升高的趋势,Zn9.3Al7Cu0.3La Nd钎料的腐蚀速率最低,较基体钎料降低了76.8%。适当添加量的La Nd可以提高Zn9.3Al7Cu钎料的腐蚀性能。
[Abstract]:Present situation of shortage of copper resources in China is becoming more and more serious, rising copper prices, copper aluminum generation technology has become an important way to alleviate the current shortage of copper resources in China. The data showed that in twenty-first Century, the commonly used dissimilar metal joint in Al Cu joint will account for nearly 5.8%. brazing method is one of the more advantages of the connecting copper aluminum connecting method, brazing method preparation of copper aluminum joint has small welding deformation, the welding quality is stable and reliable, the brazing equipment is simple, low cost advantage and characteristics. In order to realize the optimization and promote the further application of copper brazing, aluminum and copper technology, this paper selects the comprehensive excellent performance for Zn9.3Al7Cu solder matrix, multi solder alloy by adding trace rare earth La Nd formation. Study of the additions of La Nd on the physical properties of Zn9.3Al7Cu solder alloy (melting temperature, density, resistivity, hardness, microhardness), mechanical properties (elongation tensile strength), The performance of the brazing process (in Cu, Al substrate and corrosion properties of the spreading area) (electrochemical corrosion potential, corrosion current density, immersion corrosion rate) effect, and to optimize the composition of alloy, alloy formula obtained good comprehensive performance. The results show that with the increasing of the amount of rare earth La Nd, Zn9.3Al7Cux La Nd solder the melting point increases gradually, but the increase rate is limited, Zn9.3Al7Cu0.1La Nd solder in solid-liquid phase melting range is reduced by 7 degrees compared with Zn9.3Al7Cu solder, the solder wettability promoted.Zn9.3Al7Cux La Nd solder density, electrical resistivity increased with the increase of La Nd gradually increased, the solder resistivity increase, Zn9.3Al7Cu0.5La resistivity of Nd solder 0.2 * 10-6? M, than that of the matrix solder (0.17 * 10-6? M) increased 11%.Zn9.3Al7Cux La Nd solder hardness and microhardness with the increase of La Nd increased gradually, When the La content of Nd was 0.5%, Brinell hardness Zn9.3Al7Cu0.5La Nd solder alloy is 88.7HB, than that of the matrix solder (85.2HB) increased by 4.1%, hardness is 113.5HV, compared with the substrate (97.5HV) solder increases 6.2%. rare earth elements La the amount of Nd on the Zn9.3Al7Cu solder on Cu, influence the spreading properties on the Al substrate, Zn9.3Al7Cu Cu solder on Al substrate, the spreading area were 50.1mm2 and 253.2mm2, when the La content of Nd was 0.1%, Zn9.3Al7Cu0.1La Nd Cu solder on Al substrate, the spreading area is the largest, respectively 60.3mm2 and 371.2mm2, than that of the matrix solder increased respectively 20.4% and 46.6%; mixed rare earth La can increase the amount of Nd the tensile strength of solder and elongation, tensile strength and elongation of Zn9.3Al7Cu solder were 287MPa and 8.6%, the tensile strength and elongation of Zn9.3Al7Cu0.3La Nd solder, 307MPa and 11.6% respectively, compared with the substrate solder points Don't increase the corrosion potential of 11.6%.Zn9.3Al7Cux 7% and La Nd with La solder Nd content increased first and then decreased, but the magnitude is small, the corrosion current La with the increase of Nd content increased firstly and then decreased, the corrosion current Zn9.3Al7Cu0.3La Nd solder is reduced by nearly an order of magnitude than that of the matrix solder, the corrosion resistance of solder the best Zn9.3Al7Cux La Nd 3.5%Na; in Cl solution the corrosion rate with the increase of Nd amount of La first increased and then decreased, the corrosion rate of Nd solder Zn9.3Al7Cu0.3La, than that of the matrix solder reduced 76.8%. proper amount of La Nd can improve the corrosion resistance of Zn9.3Al7Cu alloy.

【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG425

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