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滚镀钯镍合金闪镀金新工艺研究
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作者 吴柏铭 郁祖湛 徐忠伦 《电镀与环保》 CAS CSCD 1990年第5期8-10,共3页
电子工业中相当数量的零件不宜用吊镀,同时钯镍合金白色的外观不易为用惯黄金镀层的用户接受,因此本文提出了滚镀钯镍合金后再闪镀一层软金的新工艺。采用本工艺后所得制品的外观与光亮镀金色泽一致,硬度可达Hv400,成本只占硬金成本的1/... 电子工业中相当数量的零件不宜用吊镀,同时钯镍合金白色的外观不易为用惯黄金镀层的用户接受,因此本文提出了滚镀钯镍合金后再闪镀一层软金的新工艺。采用本工艺后所得制品的外观与光亮镀金色泽一致,硬度可达Hv400,成本只占硬金成本的1/3左右。镀液稳定,无毒,三废处理简单,操作维护方便,经济效益显著。 展开更多
关键词 钯镍合金 闪金工艺 滚镀
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Mineral cleavage nature and surface energy: Anisotropic surface broken bonds consideration 被引量:18
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作者 高志勇 孙伟 胡岳华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第9期2930-2937,共8页
The population of surface broken bonds of some typical sulfide, oxide and salt-type minerals which may belong to cubic, tetragonal, hexagonal, or orthorhombic system, were calculated. In terms of the calculation resul... The population of surface broken bonds of some typical sulfide, oxide and salt-type minerals which may belong to cubic, tetragonal, hexagonal, or orthorhombic system, were calculated. In terms of the calculation results, the cleavage natures of these minerals were analyzed, and the relationship between surface broken bonds density and surface energy was also established. The results show that the surface broken bonds properties could be used to predict the cleavage nature of most of minerals, and the predicted cleavage planes agree well with those reported in previous literature. Moreover, this work explored a rule that, surface broken bonds density is directly related to surface energy with determination coefficient(R2) of over 0.8, indicating that the former is a dominant factor to determine the latter. Therefore, anisotropic surface broken bonds density can be used to predict the stability of mineral surface and the reactivity of surface atoms. 展开更多
关键词 surface broken bonds CLEAVAGE surface energy pyrite SPHALERITE CASSITERITE rutile HEMATITE
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印制插头与化学镍金复合表面处理加工工艺研究 被引量:2
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作者 唐殿军 陈春 《印制电路信息》 2015年第A01期205-209,共5页
PCB应用领域的不同,对表面处理要求也不同,部分产品需要选用复合表面处理,同时满足优良的可焊性、耐磨性、无铅化等要求,文章对印制插头电镀厚金与化学镍金复合表面处理加工方法进行研究,寻找高效率、低成本、高品质的加工方法,... PCB应用领域的不同,对表面处理要求也不同,部分产品需要选用复合表面处理,同时满足优良的可焊性、耐磨性、无铅化等要求,文章对印制插头电镀厚金与化学镍金复合表面处理加工方法进行研究,寻找高效率、低成本、高品质的加工方法,同时为PCB精益化生产提供参考案例。 展开更多
关键词 表面处理 闪金 化学镍金 印制插头
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Adsorption mechanism of sodium oleate and styryl phosphonic acid on rutile and amphibole surfaces 被引量:4
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作者 Wei XIAO Ya-xin REN +4 位作者 Juan YANG Pan CAO Jun WANG Wen-qing QIN Guan-zhou QIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第9期1939-1947,共9页
A reagent combination of sodium oleate(NaOl)and salicyl hydroximic acid was employed as the roughing and scavenging collectors,whereas styryl phosphoric acid(SPA)and octanol were employed as the cleaning collectors.Re... A reagent combination of sodium oleate(NaOl)and salicyl hydroximic acid was employed as the roughing and scavenging collectors,whereas styryl phosphoric acid(SPA)and octanol were employed as the cleaning collectors.Results of bench-scale flotation demonstrate that the dosage of SPA can be reduced by about 80%,and that a better flotation index can be obtained using the proposed reagent system.The results of adsorption amount and contact angle measurements indicate that the rutile surface adsorbed not only a large amount of residual NaOl but also SPA and a small amount of NaOl remained on the amphibole surface in strong acidic solution.The hydrophobic difference between rutile and amphibole surfaces was therefore amplified in cleaning,and their further separation became much easier consequently. 展开更多
关键词 RUTILE amphibole flotation separation combined collector synergistic adsorption mechanism
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Zircon U-Pb geochronology and geochemistry of diorite dikes from Nancha ore deposit in Tonghua area of Jilin and its geological significance 被引量:2
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作者 WU Qiong SUN Fengyue +3 位作者 WANG Li LIU Jinlong TIAN Lidan WANG Fei 《Global Geology》 2017年第1期21-31,共11页
The authors presented geochronology and geochemical data of diorites from Nancha gold deposit in Tonghua region, with the aim to constraining its formation age, magma source and tectonic setting. LA-ICP-MS U-Pb dating... The authors presented geochronology and geochemical data of diorites from Nancha gold deposit in Tonghua region, with the aim to constraining its formation age, magma source and tectonic setting. LA-ICP-MS U-Pb dating results of zircons from the diorites indicate that the rocks were formed in the Middle Jurassic (171 ±2 Ma, MSWD = 1. 19). Geochemically, these rocks have Si02 concentrations of 52. 52%-54. 90%,K20 of 2. 14%-3.84% , Na20 of 3. 17%-3. 35% , MgO of 7. 43%-9. 34% and high Mg# of 68. 57-72. 57. These rocks are characterized by enrichment in large ion lithophile elements( LILE,such as K, Ba, Rb and Sr) and light rare earth elements ( LREE) , relatively depletion in high field strength elements ( HFSE, such as Ta, Nb, Ti and Zr) , and heavy rare earth elements (HREE). These characteristics suggest that primary magma of the rocks were derived from the partial melting of mantle with miner crustal contamination, which may related to partial melting of mantle wedge by addition of sediment melt from subducting oceanic crust. Based on former and present studies, the authors consider that the Nancha ore deposit high-Mg diorites were formed in compres- sional structural setting which is similar to volcanic arc. It could be related to the subduction of the Paleo-Paci- fic plate beneath the Eurasian continent. 展开更多
关键词 zircon U-Pb chronology GEOCHEMISTRY DIORITE Nancha gold deposit Tonghua Jilin
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Peculiarities of Structural Transformations in HAZ Metal of Rail Steel M76 Joint Produced by Flash-Butt Welding
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作者 Georgy Grigorenko Valery Kostin +1 位作者 Victor Zhukov Tetiana Zuber 《Journal of Physical Science and Application》 2016年第5期54-65,共12页
The railway transport is one of the main types of communications in the world. Analysis of service conditions of the most critical elements of the railway transport rolling stock (mils, wheels and tyres) shows that ... The railway transport is one of the main types of communications in the world. Analysis of service conditions of the most critical elements of the railway transport rolling stock (mils, wheels and tyres) shows that one of the main factors determining their reliability and service life is the structural-phase state of steel, which is formed in the process of its producing. Complication of service conditions leads to the more severe requirements, specified by the consumers, where the high level of strength and hardness should be combined with high values of ductility and toughness. Realization of these requirements is possible only at the integrated approach to the improvement of technology of their production on the basis of profound knowledge in kinetics of austenite decay processes of structure formation and its contribution to the mechanical properties. With the formation of mainly bainite-martensite structures in the HAZ (heat-affected zone) metal of welded joints of these steels and saturation of this region with diffusive hydrogen their susceptibility to the cold cracking is increased. In this connection this work presents the results of investigations of effect of the WTC (welding thermal cycles) on the nature of structural transformations, hardness, static strength and resistance to the formation of cold cracks in HAZ metal of high-strength carbon rail steel M76. For this purpose, the structure and kinetics of transformation of an overcooled austenite was studied using the advanced methods of physical materials science by the modeling of phase transformations in the Gleeble 3800 unit. It was found that the cause of reduction in mechanical properties of welded joints of steel M76 is the formation of regions with a completely martensite structure in the amount of up to 5%. Results of investigations will be applied for the optimizing the technology and conditions of FBW of the advanced rail steels. 10 Ref., 4 Tables, 11 Figures. 展开更多
关键词 High-strength carbon rail steel austenite decay ferrite BAINITE martensite.
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