Journal
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
Volume 40, Issue 7, Pages 1065-1072Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0890-6955(99)00107-8
Keywords
thickness uniformity; nickel electroforming; LIGA; metallic microstructures
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An effective method to improve thickness uniformity in nickel electroforming for the LIGA process to produce metallic microstructures is described. The deposited metal distribution is naturally a concave shape over the whole area of the plating base proved by experiments. The edge thickness of the plating area is usually twice or higher than the center of the plating area. A secondary cathode (guard ring) was applied to improve the electroform uniformity. The experimental result of a Joule-Thomson micro-cooler proved its feasibility. The thickness ratio of edge to center of a 500 mu m sample decreased from 2.5 to 1.4. The thickness uniformity improvement is achieved without a loss in plating rate in the center of the features. (C) 2000 Elsevier Science Ltd. All rights reserved.
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