Carbon fibre reinforced polymers (CFRP) have commonly been used in aerospace applications because of their light weight, high strength and high stiffness. However, in general engineering comparable usage has been impeded by high costs of production, missing materials science know-how, lack of design experience, and especially insufficient wear resistance of the CFRP surface. Nowadays CFRP rolls can be used economically for textile and printing machines owing to the considerably automated manufacturing process (wet winding method). For this application, CFRP rolls should be fitted with a metal coating for tribological purposes. Principally, metallic wear resistant coatings can be plated on polymer surfaces by PVD processes (ion plating, sputter process), thermal spraying (plasma spraying in air) or by the electroless-electrolytic plating processes. However, on CFRP rolls a wear resistant coating can only be plated by electroless--electrolytic processes because of the maximum sizes of the CFRP rolls (L~ 10 m, ~ ~ 1.5 m), the demanded functional properties of the coating, and the efficiency also demanded of the metallization process. A survey of the practical use of metal coated polymers indicates that pretreatment of the CFRP surface by mechanical roughening and addi- 0257-8972/95/$09.50 © 1995 Elsevier Science S.A. All rights reserved SSDI 0257-8972(94)01024-D tionally chemical etching is necessary to generate best metal-polymer adhesion. For chemical etching of polymers, a large variety of chemical agents are used to oxidize, dissolve, hydrolyse, and/or swell the polymer surfaces. The most common agent consists of a solution of chromium trioxide and sulphuric acids. This acid is extremely toxic and harmful.
本文由桑尧热喷涂网收集整理。本站文章未经允许不得转载；如欲转载请注明出处，北京桑尧科技开发有限公司网址：http://www.sunspraying.com/
|
