Other

Singapore Institute of Manufacturing Technology

Gnian Cher Lim

Li Lu

Yoke San Wong

Jerry Ying Fuh

Hong Yu Zheng

Zhenda Chen

This invention presents the process of direct laser casting of copper alloys: Cu&mdash;X (where X&equals;Ni, Fe, W;) and their composites Cu&mdash;Y and Cu&mdash;X&mdash;Y (Y&equals;WC, TiC, Ti&plus;C) from powders prepared using mechanical mixing and ball milling processes. Since the metallic powder is combined with a low melting point Cu metal, which has good thermal and electrical conductivity, the combination allows the powder mixture to be melted by CO laser and re-solidified into a part with good mechanical properties and conductivity. The laser casting process for the Cu-based in-situ formation and the material systems formed using the said method have been developed. The process can be used to fabricate complex three-dimensional objects by multi-layer overlapping and the material systems can be used to build rapid tooling due to the properties of good thermal conductivity and low wear rate.

Method of laser casting copper-based composites

A method of laser marking which comprises applying a laser beam to a metal surface under the influence of an assist gas to produce durable, repeatable and striking colors on the metal surface. The method provides an easy and flexible alternative to conventional metal decorating techniques.

Process for laser marking metal surfaces

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Singapore, Singapore

Gnian Cher Lim