Copper composite coatings

Improving the Wear Resistance and Frictional Coefficient of Copper Composite Coatings Containing Lube Oil-Microcapsules... 

Copper composite coatings have been investigated for their potential engineering applications resulting from the outstanding properties of wear... 

Medeliene V, Juskenas R., Kurtinaitiene M., Selskiene A. and Stankevic V. (2010), The impact of carbon nanomaterials on the formation and properties of electrodeposited copper composite coatings . Materials Science, 16(1), 35-9. 

Yang Y. L., Wang Y. D., Ren Y, He C. S., Deng J. N. et al. (2008), Single-waUed carbon nanotube-reinforced copper composite coatings prepared by electrodeposition under ultrasonic field , A/aier Lett., 62,47-50, doi 10.1016/j.matlet.2007.04.086. 

The double microemulsion-mediated process also provides a convenient method for preparing a metal-containing sihcate coating. The two microemulsion systems contained two common components anionic sirrfactant AOT and cyclohexane [134]. The difference was that the first microemulsion consisted of an aqueous solution of sodiirm metasihcate (0.2 M) and 10 wt% SDS as the co-surfactant, while the second microemulsion consisted of an aqueous solution of copper nitrate (0.1 M) and 10 wt% SDS. The copper-ion microemulsion was added to the silicate-ion microemulsion with constant stirring. After 8 h of gel-lation, and ageing for an additional 24 h, copper nitrate crystals were identified within the sihcate network. SUica-copper composite powders with various copper contents (4-20 wt%) and surface areas of 200-400 m /g were synthesized. 

The particle size and composition of the dispersed phase of the colloidal dispersions were studied by transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis and photoluminescence (PL) spectroscopy. The TEM experiments were carried out on a LEO-906 device. The samples were obtained by placing a drop of the colloidal solution in toluene on TEM copper grid coated with a thin layer of carbon and evaporated in air at room temperature. XRD patterns of powders were obtained by a diffractometer HZG 4A using CuKa radiation. The UV-vis spectra of the colloidal dispersions were recorded using Cary 500 Scan UV-VIS-NIR spectrophotometer with a 1-cm quartz cell. The PL spectra were recorded using a SFL-1211A spectrofluorimeter. 

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