共查询到19条相似文献,搜索用时 187 毫秒
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感应钎焊技术因其具有加热迅速、焊接效率高、焊料氧化少和加热部位局域化的优点,被用来焊接微波组件中的电连接器。针对组件外形不同和待焊电连接器种类不同,设计了与组件结构相匹配的感应线圈,探索优化了感应加热参数设置。焊接获得的电连接器焊缝质量良好、气密性指标优异,满足气密封质量要求。 相似文献
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某一维相扫裂缝波导阵列天线由多组铝合金波导组件组成。其结构复杂,尺寸及形状精度要求高。铝合金裂缝波导组件是该天线主要的结构部件,需要进行矫形和折弯、精密数控加工等工艺。然后纽装焊接成形。在该组件的焊接过程中如何控制焊接热变形。是保证其尺寸及形状精度关键。本文通过对铝合金裂缝波导组件及其整体钎焊定位夹具在钎焊时热变形的有限元仿真分析和优化的探讨.提出了可有效控制波导组件尺寸及形状精度的铝钎焊夹具的设计和热分析方法。 相似文献
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收发组件作为军/民用航天雷达的重要组成部分,其稳定性和可靠性对功能实现起着关键作用。航天用收发组件由于尺寸较大,铝合金盖板在真空环境中易产生变形导致焊缝气密失效。为保持良好的微波性能、可靠性、气密性,对焊缝的熔深和密封质量提出了更高的要求。该组件的另一特点是集成度高、侧壁装配的连接器多,因此封焊过程产生的温升还应控制在连接器低温钎焊缝的熔点以下。采用不同能量的激光焊接技术,研究了铝合金收发组件的熔深和密封质量,并对射频连接器周围的温度进行了测试。在此基础上,获得了适合于航天大尺寸收发组件的焊缝熔深和相应的激光能量,使其气密性能满足并优于GJB548B的要求。 相似文献
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真空/控制气氛无钎剂激光软钎焊系统的研制 总被引:3,自引:1,他引:3
结合激光软钎焊技术的特点,研制了真空/控制气氛无钎剂激光软钎焊系统,以便利用激光软钎焊的优点,进行真空/控制气氛下激光非接触加热的无钎剂技术研究。 相似文献
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介绍了激光焊接机理和特点,分析了铝合金的激光焊接工艺特性,设计了激光焊接密封接头结构.通过对铝合金封装壳体的激光焊接密封工艺试验和分析,研究了装配间隙、材料表面状态、焊接工艺参数和工装夹具等因素对焊接密封质量的影响,成功实现了良好焊缝质量的焊接,达到微波组件氦气泄漏率低于1×10-8 Pa·m3/s的密封要求. 相似文献
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跨接片能够解决异质材料热失配的问题,因此被广泛地应用于微波组件中射频信号的连续传输。针对微波组件用跨接片激光软钎焊工艺开展研究,优化了焊膏涂覆方式和激光焊接的工艺流程,对比分析了跨接片激光软钎焊和手工焊接的焊点力学性能及微观组织,并开展了温度循环试验。结果表明:相比跨接片手工焊接的方式,激光焊接的焊点剪切力平均值更大、标准差更小;从微观组织可以看出跨接片采用激光软钎焊焊点的金属间化合物厚度均匀且连续,符合标准要求。按照某型雷达产品环境应力筛选规范开展跨接片温度循环加严试验,试验后焊点无缺陷,符合产品要求。 相似文献
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为解决由于射频同轴电缆组件电压驻波比大引起的放大器自激问题,对影响电缆组件电压驻波比的因素进行了分析。通过电缆组件电压驻波比的计算公式,阐述了电缆剥头尺寸和组件焊接方法在电缆组件装接过程中的重要性,提出了降低组件电压驻波比的方法。通过对电缆剥头尺寸、组件焊接和测试方法的改进,降低了驻波比。经实际测试和应用,组件满足使用要求,消除了自激现象。 相似文献
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采用实验测量与数值模拟相结合的方法研究了切向表面气流环境中激光对薄铝板的辐照效应。实验结果表明:相同速度的氮气流和空气流中,铝板温度曲线相似,说明对于铝这种材料而言,空气流的氧化烧蚀几乎不能进行。无切向气流时,辐照过程中相同时刻铝板的温升及铝板达到的最高温度都高于氮气流和空气流情形。三种环境中,铝板中心位移的变化趋势同温度的变化趋势相同,说明激光加热产生的热应力是铝板形变的主要原因,切向气流不起主导作用。利用有限元分析软件ANSYS数值模拟了铝板温度场及形变的演化过程,分析了激光功率分布和对流换热对结果的影响,数值模拟结果同实验符合地较好。研究结果表明:在较低激光功率密度条件下,切向气流主要通过对流换热对铝板起冷却作用,尤其在激光辐照停止后的降温阶段,其作用更加明显。 相似文献
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介绍了一种基于PIN二极管HSMP-3822的倍频组件的设计,该设计降低了组件内部对滤波器的要求,使得设计出来的组件成本低、体积小、使用方便。测试结果验证了该组件满足各项技术指标要求,性能较好。 相似文献
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Mingyu Li Hongbo Xu Lee S.-W.R. Jongmyung Kim Daewon Kim 《Advanced Packaging, IEEE Transactions on》2008,31(2):399-403
This paper presents a feasibility study of using eddy current induced heating for the solder reflow of area array packages. With a high frequency electromagnetic field, Sn 3.5% Ag lead-free solder balls were heated to melt and wet the solder pads on an organic substrate. The experimental results showed that such a solder reflow process could be implemented effectively in a wide processing window. With an infrared temperature sensor, it was found that the temperature difference between the solder balls and the FR4 board might reach 80 , indicating a rather localized heating mechanism. In addition, the heating and cooling rates during the soldering were found very high. This is another feature of the induction heating reflow process. It was also found that the generated temperature in the solder balls would depend on the size of the solder balls. This characteristic may be used to perform selective soldering of flip chip BGA packages. Furthermore, the developed soldering process was applied to the board level reflow of actual components. The result verified that the induction heating reflow is a feasible soldering process in actual applications. 相似文献
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Study on Cu particles-enhanced SnPb composite solder 总被引:4,自引:0,他引:4
The Sn-Pb solder is widely used in the electronics industry. With the development of surface mount technology and miniaturization
of elements, mechanical properties of the solder are critical. Creep resistance and size stability of soldered joints are
important for optical electronics. In the present work, Cu particles with a size of about 8 μm were added to the eutectic
63Sn-37Pb solder to improve the creep property of the soldering alloy. The contents of the Cu particles are 5 vol.% and 10
vol.% separately. The solder matrix is 63Sn37Pb particles with a normal size of 43 μm. The composite solder pastes are manufactured
from a mixture of these particles with no-clean flux. Under reflow soldering, the metal particles were uniformly dispersed
in the Sn-Pb alloy, and very thin intermetallic compounds were formed between the particles and matrix. To simulate practical
soldering of printed circuit boards, a specially designed mini specimen with lap joint is used for the creep-rupture test.
For the condition of ambient temperature, the creep-rupture lifetime of the soldered joint can be increased by one order quantitatively
using the composite solder compared to the 63Sn37Pb eutectic solder. Other mechanical properties are measured also. In addition,
the wetting property of the enhanced solder is good through the wettability test. 相似文献
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铜焊盘与锡合金焊点界面物相分析及可靠性探讨 总被引:1,自引:0,他引:1
Sn60Pb40焊料与铜焊盘的焊接界面中金属间化合物Cu6Sn5的形成与长大以及在热循环过程中的组织粗化是影响焊点可靠性的重要因素。作者根据SMT工艺的实际情况,使用Au—Sn共晶焊料、Sn60Pb40焊料分别涂覆在铜合金基板表面,并分别在320℃、240℃下保温1min,冷却形成焊点,利用X射线研究分析了两种不同焊盘基材与Sn60Pb40钎料、Au—Sn共晶钎料的钎焊界面的物相。运用经典相变理论、低周疲劳失效的机理以及“柯肯达尔”效应,就优异焊点的形成、物相产生、温度循环后组织粗化与增加Ni阻挡层,对提高焊接接点的温度循环可靠性的作用进行了分析与探讨。 相似文献
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A temperature-regulating circuit, applicable to irradiation systems designed for investigation of microwave bioeffects (at cellular levels), is described. The temperature regulator provides a thermal balance between two biological suspensions in aqueous media, by heating one sample electrically when the second specimen is heated by means of microwaves. 相似文献