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锡及锡合金可焊性镀层电镀工艺 总被引:1,自引:1,他引:1
介绍了目前常用于电子元器件电镀纯锡液的主要技术要求。阐述了酸性硫酸盐镀锡、酸性氟硼酸盐镀锡或锡-铅合金、烷基磺酸盐镀锡或锡-铅合金、中性或弱酸性镀锡或锡-铅合金的工艺特点、镀液镀层性能及性价比。还介绍了Sn—Bi、Sn—Ag、Sn—Cu无氟无铅可焊性电镀锡基二元合金的特点、性能及典型的工艺配方。 相似文献
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无氟电镀锡铅合金新工艺的应用 总被引:1,自引:0,他引:1
本文介绍无氟的以羟基烷基磺酸作络合剂电镀锡铅合金在生产上的应用。羟基烷基磺酸型电镀锡铅合金与传统的氟硼酸型镀液相比,其突出优点:(1)不含氟,有利于环境保护;(2)镀液配制相当简单;(3)镀液稳定易于维护;(4)电流密度变化,镀层中锡铅比稳定;(5)镀层中铅的百分含量与镀液中铅的百分含量成正比,易于得到预定组成的镀层;(6)分散能力和深镀能力好,滚镀挂镀均适用。 相似文献
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《电镀与精饰》2001,23(5)
电镀锡及其合金两则 2 0 0 1 5 0 1 Sn- Bi合金镀层制造方法发明了一种 Sn- Bi合金镀层的制造方法。该方法包括以下几个步骤 ,首先在基体上电镀一层金属Bi,然后在 Bi镀层上电镀一层金属 Sn,Sn镀层的厚度为 Bi镀层厚度的 1 .5倍。最后进行两种镀层的重熔。用这种方法所获得的 Sn- Bi合金镀层具有优良的质量和很好的焊接性能。所使用的电镀液中不含螯合剂。该镀层可用于接头 ,引线头与导线、线路板等。(日本专利 ) JP1 1 2 79789- A( 1 999- 1 0 - 1 2 )2 0 0 1 5 0 2 电镀锡或锡 -铅合金镀液发明了一种新的电镀锡或锡 -铅合金镀液。镀… 相似文献
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CHIKARA HIRAYAMA 《Journal of the American Ceramic Society》1960,43(10):505-508
The volatility of binary lead silicate and lead borate melts has been determined at reduced pressures. These systems contain more than 71%, lead oxide. At comparable temperatures, the volatility of the binary lead silicate melt is higher than that of the lead borate of corresponding PbO to boron ratio. The volatilization of PbO is diffusion controlled. The approximate vapor pressure of PbO at 900°C. is 0.2 mm. Hg. 相似文献
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Lead Galliate Glasses 总被引:1,自引:0,他引:1
Glasses have been formed in the binary system PbO–Ga2 O3 within the compositional range extending from 60 to 80 mol% PbO. These glasses exhibit infrared cutoff values near 7.75 μm. The glasses are orange-red as a result of a cutoff in visible transmission near 500 nm. The glass transformation temperature decreases with increasing PbO concentration, whereas the thermal-expansion coefficient and density increase with increasing PbO content. Glasses containing 70 to 75 mol% PbO are good glass formers, with little tendency to crystallize, and exhibit good weathering behavior on exposure to normal atmosphere. 相似文献
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Takeo Hattori Yasuhiko Iwadate Tatsunori Sato 《Journal of the American Ceramic Society》1990,73(1):140-141
PbSe and PbS are both volatile and difficult to densify by normal sintering. We tried to sinter these compounds in a closed system, that is, by hot isostatic pressing in a glass capsule. Hot isostatic pressing was carried out for these compounds on the basis of their thermal behaviors in air as studied by TG-DTA. The maximum bulk densities obtained were 8.10 and 7.50 g/cm3 , respectively, corresponding to their theoretical densities. The microstructures of the isostatically hot-pressed bodies were also observed by SEM. The present work shows that ceramic compounds which are normally volatile can be densified by encapsulation in glass followed by hot isostatic pressing. 相似文献