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  本文關鍵詞：銅鋁釬焊用ZnAlCuRE高溫軟釬料研究　出處：《河南科技大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 銅鋁釬焊 ZnAlCuRE釬料 物理性能 釬焊工藝性能 力學性能 腐蝕性能

【摘要】：我國銅資源短缺現(xiàn)狀愈發(fā)嚴峻,銅價不斷上漲,鋁代銅技術已成為緩解我國銅資源短缺現(xiàn)狀的重要途徑。有數(shù)據(jù)表明:21世紀,常用異種金屬接頭中鋁銅接頭將占到近5.8%。釬焊法是銅鋁連接中較有優(yōu)勢的連接方法之一,釬焊法制備銅鋁接頭具有焊接變形小,焊接質(zhì)量穩(wěn)定可靠,釬焊設備簡單,成本較低等優(yōu)勢及特點。為了實現(xiàn)和優(yōu)化銅鋁釬焊,推動鋁代銅技術的進一步應用,本文選取綜合性能優(yōu)良的Zn9.3Al7Cu釬料為基體,通過加入微量混合稀土La Nd形成多元釬料合金,研究了添加元素La Nd對Zn9.3Al7Cu釬料合金物理性能(熔化溫度、密度、電阻率、布氏硬度、顯微硬度)、力學性能(抗拉強度、延伸率)、釬焊工藝性能(在Cu、Al基板上的鋪展面積)及腐蝕性能(電化學腐蝕電位、腐蝕電流密度、全浸沒腐蝕速率)的影響,進而優(yōu)化合金成分,獲得綜合性能良好的合金配方。結(jié)果表明:隨著稀土La Nd添加量的增加,Zn9.3Al7Cux La Nd釬料的熔點逐漸升高,但增加幅度有限,Zn9.3Al7Cu0.1La Nd釬料的固液相熔化區(qū)間較Zn9.3Al7Cu釬料降低了7℃,這對釬料的潤濕性能有促進作用。Zn9.3Al7Cux La Nd釬料密度、電阻率均隨著La Nd添加量的增加逐漸升高,其中釬料電阻率增幅較大,Zn9.3Al7Cu0.5La Nd釬料電阻率為0.2×10-6?m,較基體釬料(0.17×10-6?m)升高了11%。Zn9.3Al7Cux La Nd釬料布氏硬度及顯微硬度隨隨著La Nd添加量的增加逐漸升高,當La Nd添加量為0.5%時,Zn9.3Al7Cu0.5La Nd釬料合金布氏硬度為88.7HB,較基體釬料(85.2HB)提高了4.1%,顯微硬度為113.5HV,較基體(97.5HV)釬料提高了6.2%。稀土元素La Nd添加量對Zn9.3Al7Cu釬料在Cu、Al基板上的鋪展性能影響較大,Zn9.3Al7Cu釬料在Cu、Al基板上的鋪展面積分別為50.1mm2和253.2mm2,當La Nd添加量為0.1%時,Zn9.3Al7Cu0.1La Nd釬料在Cu、Al基板上的鋪展面積最大,分別為60.3mm2和371.2mm2,較基體釬料分別增大了20.4%和46.6%;添加適量的混合稀土La Nd能提高釬料的抗拉強度和延伸率,Zn9.3Al7Cu釬料的抗拉強度和延伸率分別為287MPa和8.6%,Zn9.3Al7Cu0.3La Nd釬料的抗拉強度和延伸率最大,分別為307MPa和11.6%,較基體釬料分別增加了7%和11.6%。Zn9.3Al7Cux La Nd釬料的腐蝕電位隨La Nd添加量的增加先升高后降低,但幅度不大,腐蝕電流隨La Nd添加量的增加先降低后升高,Zn9.3Al7Cu0.3La Nd釬料的腐蝕電流較基體釬料降低了近一個數(shù)量級,此時釬料的抗腐蝕性最好;Zn9.3Al7Cux La Nd在3.5%Na Cl溶液中的腐蝕速率隨著La Nd添加量的增加呈現(xiàn)先降低后升高的趨勢,Zn9.3Al7Cu0.3La Nd釬料的腐蝕速率最低,較基體釬料降低了76.8%。適當添加量的La Nd可以提高Zn9.3Al7Cu釬料的腐蝕性能。
[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.

【學位授予單位】：河南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG425

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本文編號：1375789