Abstract
Micro-texturing has grown up to be one of the most promising procedures. This related application required for large-area, fine micro-texturing onto the stainless steel mold materials. A new method other than laser-machining, micro-milling or micro- EDM was awaited for further advancement of this micro-texturing. In the present paper, a plasma nitriding assisted micro-texturing was developed to make various kinds of micro- patterns onto the martensitic stainless steels. First, original patterns were printed onto the surface of substrate by using the ink-jet printer. Then, the masked substrate was subjected to high density plasma nitriding; the un-masked surfaces were nitrided to have higher hardness. This nitrided substrate was further treated by sand-blasting to selectively dig the soft, masked surfaces. Finally, the micro-patterned martensitic stainless steel substrate was fabricated as a mold to duplicate these micro-patterns onto the work materials. The spatial resolution and depth profile controllability of this plasma nitriding assisted micro-texturing was investigated for variety of initial micro-patterns. The original size and dimension of initial micro-patterns were precisely compared with the three dimensional geometry of micro-textures after blasting treatment. The plastic cover case for smart cellular phones was employed to demonstrate how useful this processing is in practice.
Highlights
Micro- and nano-textures on the metal and polymer surfaces of parts and components have functions to reduce the friction and wear and to improve the joining strength [1, 2]
Micro-texturing has grown up to be one of the most promising procedures. This related application required for large-area, fine micro-texturing onto the stainless steel mold materials
The plastic cover case for smart cellular phones was employed to demonstrate how useful this processing is in practice
Summary
Micro- and nano-textures on the metal and polymer surfaces of parts and components have functions to reduce the friction and wear and to improve the joining strength [1, 2]. A non-traditional micro-texturing method is demanded in market to fabricate the injection molds in much shorter processing time. The authors [5,6,7,8,9] have proposed an alternative micro-texturing with aid of the high density plasma nitriding. This micro-texturing method is described for each step to fabricate the microtextured stainless steel mold for injection. The injection molding is utilized to duplicate the micro-textures cut into the mold onto the plastic cover-case surface
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