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Plasma Aided Process As Alternative to Hard Chromium Electroplating
Kwon, Sik-Chol,Lee, K.H.,Kim, J.K.,Kim, M.,Lee, G.H.,Nam, K.S.,Kim, D.,Chang, D.Y. The Korean Institute of Surface Engineering 2003 한국표면공학회지 Vol.36 No.1
This paper will present an overview of toxicity of hexavalent chromium as well as effort for its replacement by a wide spectrum of alternative materials and technologies. Cr-based materials such as trivalent electrodeposit will be one of strong candidates for hard chromium by surface modification of its surface hardness. Ni-base alloy deposits has proved its application in specific mold for glass. HVOF has been studied in aircraft and military sector. There are still under way of development for commercially available alternatives. To date, no single coating has been identified as universal process as comparable to conventional hard chromium electroplating.
Kwon, Sik-Chol,Rha, Jong-Joo,Beck, Woon-Seung The Korean Vacuum Society 1997 Applied Science and Convergence Technology Vol.6 No.1
The attempt to enhance the strength of materials has been an important subject for materials engineering and scientists. The strength of materials is termed as the ability to support high load without excessive deformation and without breaking catastrophically. The control of dislocation densities and barriers to the movement of dislocations have been considered to be the important methods for the strengthening materials. One of the approaches is mechanical blocking of dislocations by alternately depositing material layers. The typical structure of materials is multilayered and laminated composites. The thickness of each layer is typically in the range of nanometer. Ton avoid confusion with other terminology they may be defined as microlaminate composite materials. The manufacturing process of multilayered laminate structure will be introduced. And the current theoretical theories will be reviewed in view of strengthening of microlaminte composite materials.