共查询到18条相似文献,搜索用时 62 毫秒
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DD3单晶合金短时液相扩散连接接头组织与性能研究 总被引:1,自引:0,他引:1
采用D1P和D1F两种中间层合金在1250℃下分别保温10,30min,1,2,4h扩散连接DD3单晶合金.这两种中间层合金是在DD3合金成分基础上添加了一定量的降熔元素硼,分别以粉和箔带形式使用.对上述规范下获得的DD3接头组织和性能进行了研究分析,结果表明, 扩散时间短,D1P中间层合金扩散焊接头组织很不均匀,在中间层合金流入处生成大量光板γ′相,对接头持久性能不利,1250℃下扩散4h接头的980℃持久性能为母材性能的60%;而D1F中间层合金扩散焊接头组织均匀一致,1250℃下扩散4h接头980℃持久性能超过母材性能的70%. 相似文献
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固态扩散连接空洞闭合模型的研究进展 总被引:1,自引:0,他引:1
扩散连接是一种在固态下将2个同种或异种的材料连接在一起的先进连接方法.这种方法既可以连接低碳钢,也可以连接陶瓷,甚至还可以连接传统焊接方法所不能连接的材料.在很多材料没有实验数据的条件下,预测扩散连接所需时间是非常重要也是非常困难的,因此利用空洞闭合模型对扩散连接过程进行研究是当前固态扩散连接研究的重要方面.介绍了扩散连接空洞闭合的几个典型模型,对几何模型的选择进行了阐述,并对扩散连接的机制进行了解释和说明,同时比较了这几个模型的优缺点,并预测了扩散连接空洞闭合模型的发展方向. 相似文献
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15年前,几乎所有封装采用的都是引线键合技术,而如今倒装芯片封装技术正在逐步取代引线键合的位置。倒装芯片的基本概念就是拿来一颗芯片,在连接点位置放上导电的凸点,将该面翻转,有源面直接与电路连接。 相似文献
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铜线具有优良的机械、电、热性能,用其代替金线可以缩小焊接间距、提高芯片频率和可靠性.介绍了引线键合工艺的概念、基本形式和工艺参数;针对铜丝易氧化的特性指出,焊接时必须采用特殊的防氧化工艺,以改善其焊接性能;最后对铜丝键合可靠性及主要失效模式进行了分析. 相似文献
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TiAl/40Cr钢扩散连接界面组织结构对接头强度的影响 总被引:1,自引:0,他引:1
扩散连接界面组织结构是影响连接性能的关键因素,不同的界面组织结构及生成相所决定的接合强度不同.本文研究了TiAl/40Cr钢的扩散连接,结果显示:连接温度过高及连接时间过长时,由于界面处形成了过多的TiC脆性层及Ti3Al FeAl FeAl2的金属间化合物混合层,接头拉伸强度低;当连接温度较低及连接时间较短时,界面紧密接触与元素扩散不充分,接头拉伸强度也较低.脆性TiC层的生成导致TiAl与40Cr钢之间的扩散连接性能较差,接头均破断于TiC层或TiC层与Ti3Al FeAl FeAl2的金属间化合物混合层之间. 相似文献
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部分瞬间液相连接(PTLP连接)是实现陶瓷高强度耐热连接的一种新方法,本文综述了近年来的研究进展。着重对PTLP连接中间层材料的选择、连接参数(温度、时间、中间层材料及厚度和后热处理等)对连接过程和接头强度的影响进行了阐述。 相似文献
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The Ni-base single crystal superalloy was bonded by the transient liquid phase(TLP) bonding,using a Ni-base flexible metal cloth as an insert alloy.TLP bonding of superalloy was carried out at 1473-1523K for 0.5-24h in vacuum.The [001] orientation of each test specimen was aligned perpendicular to the joint interface.The bonded region was observed by optical microscopy, and the microstructural and compositional analyses across the bonded interlayer were performed by using a scanning electron microscopy(SEM) .The electron back scattering diffraction(EBSD) method was applied to determine the crystallographic orientation.The resultsindicated that the chemical homogeneity across the bonded region can be achieved,and γˊphase both in the bonded interlayer and in the superalloy substrate is almost identical,while the bonded interlayer had almost matched the crystallographic orientation of the bonded substrates. 相似文献
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《材料科学技术学报》2017,(6)
The microstructure evolution and oxide film behavior in ultrasound-assisted transient liquid phase(U-TLP) bonding of Mg alloy were investigated by applying different ultrasonic time at 460?C with brass interlayer in air. The results indicated that with increasing ultrasonic time, brass interlayer disappeared gradually and the Mg-Cu-Zn eutectic compounds were formed. The eutectic compounds in the joint decreased as the ultrasonic time increased further. The oxide removal process was divided into four steps. Continuous oxide film at the interface was partially fractured by ultrasonic vibration,and then suspended into liquid by undermining eutectic reaction. After that, the suspended oxide film was broken into small oxide fragments by ultrasonic cavitation effect, which was finally squeezed out of the joint by ultrasonic squeeze action. In addition, the mechanical properties of the joints were investigated. The maximum shear strength of the joint reached 105 MPa, which was 100% of base metal. 相似文献
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Barik El Mostafa Gillot Charlotte Hodaj Fiqiri 《Journal of Materials Science: Materials in Electronics》2022,33(5):2360-2374
Journal of Materials Science: Materials in Electronics - In this work, we study the Transient Liquid Phase Bonding (TLPB) for flip chip interconnexion using copper pillar and SnAg solder alloy... 相似文献