共查询到18条相似文献,搜索用时 171 毫秒
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钎焊料的选择对钎焊效果和钎焊接头质量具有重要影响。用于钛及钛合金钎焊的钎料可分为银基钎料、钯基钎料、铝基钎料、钛基钎料4大类。分别介绍了这4类钎料的特点,其中钛基钎料是钛及钛合金钎焊连接以及与其他材料钎焊连接的最佳选择,具有润湿性能好、耐腐蚀性好、高温强度高等特点。系统阐述了钛基钎料钎焊钛及钛合金以及钛及钛合金与C/C复合材料、不锈钢、陶瓷等材料钎焊的研究进展,重点介绍了钎焊接头的界面结构以及最佳钎焊工艺下钎焊接头的抗剪强度,最后展望了钛及钛合金钎焊技术的发展方向。 相似文献
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铝及铝合金钎焊技术的研究现状 总被引:10,自引:1,他引:10
综述了近年来铝及铝合金钎焊在钎焊方法、钎料及钎剂三个方面的技术发展现状,分别介绍了它们各自的发展方向。指出铝及铝合金的钎焊问题是近年来研究较多、发展较快的研究领域之一,铝及铝合金钎焊技术应用前景广阔。 相似文献
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在500~570℃的温度范围内,采用Al-Si-Cu、Al-Si-Cu-Zn钎料,对碳纤维增强铝基复合材料(碳体积分数为50%)进行了高频感应钎焊.结果表明,钎料中的Si和Cu向母材扩散,复合材料中的碳纤维与渗入的液态钎料及基体Al发生界面反应,生成了Al4C3、SiC和CuAl2脆性化合物.连接接头具有较好的力学性能,使用Al-28Cu-6Si和Al-4Cu-10Si钎料,在无压、无钎剂状态下,钎焊接头的抗剪强度分别为63和75 MPa,剪切断裂发生在钎料层与母材界面上. 相似文献
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随着制造业高速发展,钎焊技术应用越来越广,并向绿色化、高效化、自动化和高可靠方向发展。钎焊材料形态对钎焊自动化和可靠性起着至关重要的作用。目前有关钎料的研究主要基于成分、性能、工艺性及应用领域等方面。对于钎料形态方面的系统研究还鲜有报道。在钎焊过程中,采用恰当形状的钎料,可以优化工艺和提高钎焊可靠性。本文以钎料几何形态为主线,系统总结了丝状/条状、棒状、粒状、箔带状、粉末状、膏状、药芯型、非晶态及预制成形等钎料的特点、应用范围、主要代表体系、制备方法及发展现状,重点阐述了粉末、药芯型和非晶态等钎料以及常用钎焊方法所适用的钎料形态。研究认为:未来钎焊材料形态发展方向是绿色、高效、低成本并适应新材料、自动化、数字化及智能化需求。 相似文献
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Diamond has high hardness and good wear resistance. It is widely used in cutting tools and workpieces. Brazing is an effective method to realize high quality cemented carbide joints in various materials connection technologies. This paper analyzes the research status of diamond brazing in detail. The materials used as brazing filler in diamond brazing are reviewed. Copper base filler and nickel base filler are the most commonly used brazing filler in diamond brazing. The advantages and disadvantages of diamond grinding tools under different production methods are analyzed. In addition, a series of new brazing alloys such as amorphous Ni based brazing filler metals are analyzed. Finally, the development trend of diamond brazing is pointed out. 相似文献
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《Science & Technology of Welding & Joining》2013,18(6):502-508
AbstractThis study was carried out to develop cadmium free silver based brazing filler metals that meet the following requirements. First, they have to have a melting point lower than that of BAg-1 brazing filler metal. Second, they have to have not only good wetting characteristics and the ability to produce a sound joint with excellent mechanical properties but also plastic formability. Using the calculated phase diagrams on Ag–Cu–Zn–Sn quaternary system alloys, the authors selected several alloys with a possibility of meeting the above requirements. The melting point and other properties, such as hardness and brazeability of the selected alloys, were evaluated. As a result, the authors successfully developed silver based brazing filler metals that have a low melting point below ~600°C and meet the above requirements by adding a small amount of indium as an alloying element into the Ag–Cu–Zn–Sn quaternary system alloy. The newly developed brazing filler metals are slightly inferior in wetting characteristics to BAg-1; however, the brazing filler metal containing ~3 mass-% indium element showed wetting characteristics comparable to those of BAg-1. Furthermore, the new brazing filler metals could produce joints with a high tensile strength equivalent to ~83% of that of a joint brazed using BAg-1. 相似文献
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采用Ti-37.5Zr-15Cu-10Ni和Ag-28Cu两种钎料分别对TC4钛合金面板/304不锈钢蜂窝芯异种材料蜂窝结构进行了钎焊,对钎焊界面组织和蜂窝结构的力学性能进行了对比分析. 结果表明,Ti基钎料与304不锈钢蜂窝芯箔材界面润湿反应性能较差且Ti基钎料钎缝显微硬度较高,导致钎焊界面强度低,蜂窝拉伸力学性能差. Ag基钎料与304不锈钢蜂窝芯箔材和TC4面板均发生显著的界面反应,钎焊温度830 ℃,保温时间10 min时,蜂窝抗拉强度为10.35 MPa,呈蜂窝芯破坏特征. Ag基钎料蜂窝抗拉强度明显优于Ti基钎料结果,适用于TC4钛合金面板/304不锈钢蜂窝芯异种材料蜂窝钎焊. 相似文献
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The effects of Cu,Si,Ni and RE elements (RE=La and Ce) on the melting temperature of Al-Si filler metals were studied by orthogonal design method.The wettability of the filler metals and the shear strength of 6063 aluminum alloy joints brazed with the different filler metals were measured.The results show that the copper doping content has the most obvious effect on liquidus temperature (T_L) of the Al-Si filler metals and the effect of RE content on T_L is the least.Adding suitable Cu and Si can improve the wettability of the Al-Si filler metals.The shear strength of 6063 aluminum alloy joints brazed with the filler metals S10,S15 and S20,respectively,is better than that of the joints brazed with HL401 due to the improvement of microstructure.It can improve the shear strength of the joints by brazing with the Ni- or RE-doped Al-Si-Cu filler metals. 相似文献
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以BAg50CuZn钎料和BAg34CuZnSn钎料为基材,采用镀覆扩散组合工艺制备了两类镀锡银钎料,利用综合热分析仪、润湿试验炉、万能拉力试验机测定镀锡银钎料的熔化温度区间、润湿面积及钎焊接头抗拉强度,建立了钎料润湿熵和接头强度熵的数学模型,并与熔炼合金化制备的相同Sn含量的传统钎料进行对比. 结果表明,与相同Sn含量的传统钎料相比,镀锡银钎料的润湿熵值更小、强度熵值略高. 同等Sn含量条件下,镀锡银钎料和传统钎料润湿熵值的变化趋势,与对应钎料在316LN不锈钢表面的润湿面积随Sn含量的变化趋势基本一致,强度熵值的变化趋势与对应钎料钎焊316LN不锈钢接头的抗拉强度随Sn含量的变化趋势几乎吻合;润湿熵和强度熵的模型在一定程度上可定量预测镀锡银钎料的钎焊工艺性和接头力学性能. 相似文献