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Interest in electrocodeposition of nickel-based composite coatings has increased in recent years due to their unique combination of wear, magnetic, electrical, and corrosion properties (Ref 1). In general, composite coatings reinforced with hard oxide or carbide particles such as Al2O3, TiO2,SiO2, SiC, and WC or even diamond improves their wear resistance and reduces friction wear (Ref 2-4). Non-metallic inclusion such as WC and SiC in the metal changes its electron structure and crystal lattice that result in changes in the physical and mechanical properties of the electro-deposits(Ref 5, 6). On the other hand, metallic deposits such as carbon black (CB) and carbon nanotubes (CNT) incorporated in the metal through electrocodeposition result in formation of clusters. The electric fields are stronger around the CB/CNT clusters, than in other areas, which may result in increased local deposition rates and higher current densities. Under higher current densities, the differential depositing rates lead to a coarser surface. This may affect the mechanical properties of the composite coatings (Ref 7). |
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jacy_cheyn
鐵桿木蟲 (知名作家)
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【答案】應助回帖
★
kunlunlx(金幣+60, 翻譯EPI+1): 謝了，來的很及時 2011-06-02 09:28:39
Mally89(金幣+1): 感謝應助！~ 2011-06-02 20:48:56
kunlunlx(金幣+60, 翻譯EPI+1): 謝了，來的很及時 2011-06-02 09:28:39
Mally89(金幣+1): 感謝應助！~ 2011-06-02 20:48:56
| 近年來由于其獨一無二的磨損，磁，電和防腐性能，鎳基復合涂層的電沉積引起了人們廣泛的關注。大體上，添加了比如Al2O3, TiO2,SiO2, SiC, WC或者鉆石等堅硬的氧化物或者碳化物顆粒來提高他們的耐磨性，并減少摩擦磨損。非金屬夾雜物，比如金屬里面的WC，SiC改變了其電學結構和晶格，從而引起了在電沉積在物理，機械性能方面的轉變。另一方面，比如金屬中的炭黑和碳納米管這類金屬沉積能夠通過電沉積形成簇。在CB/CNT簇的周圍的電場比其他地方的電場強，使得在這些地方的沉積速度加快，并且有更高的電流密度，而不同的沉積速度就會產生粗造的表面，這就會影響復合涂層的機械性能。 |
2樓2011-06-02 09:15:53
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★ ★ ★
Mally89(金幣+3): 感謝應助！~ 2011-06-02 20:49:09
Mally89(金幣+3): 感謝應助！~ 2011-06-02 20:49:09
| Interest in electrocodeposition of nickel-based composite coatings has increased in recent years due to their unique combination of wear, magnetic, electrical, and corrosion properties (Ref 1). 近年來，鎳基復合鍍層電化學復合共沉積技術由于其獨特的耐磨性、磁性、電學和防銹蝕特性而日益引起關注。In general, composite coatings reinforced with hard oxide or carbide particles such as Al2O3, TiO2,SiO2, SiC, and WC or even diamond improves their wear resistance and reduces friction wear (Ref 2-4).通常而言，復合鍍層的可由硬氧化物或碳化物微粒如Al2O3, TiO2,SiO2, SiC和 WC的加入而得到加強，甚或金剛石加入亦可改善鍍層的耐磨性和減少磨損。 Non-metallic inclusion such as WC and SiC in the metal changes its electron structure and crystal lattice that result in changes in the physical and mechanical properties of the electro-deposits(Ref 5, 6). 金屬中的非金屬夾雜物如WC和SiC改變了金屬材料的電子結構和晶格結構，導致電沉積物物理和力學特性的變化。On the other hand, metallic deposits such as carbon black (CB) and carbon nanotubes (CNT) incorporated in the metal through electrocodeposition result in formation of clusters.另一方面，金屬沉積物，如通過電化學復合共沉積技術包含炭黑和碳納米管在金屬中者導致簇的形成。 The electric fields are stronger around the CB/CNT clusters, than in other areas, which may result in increased local deposition rates and higher current densities. 炭黑/碳納米管簇周圍的電場強度高于其他區(qū)域，可能導致局部沉積率增加和較高的電流密度。Under higher current densities, the differential depositing rates lead to a coarser surface. 在較高的局部電流密度下，差異化的沉積率造成表面粗糙。This may affect the mechanical properties of the composite coatings (Ref 7).這可能影響復合鍍層的力學性能。 |
3樓2011-06-02 09:49:37
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