A Study On Laser Selective Etching Organic Composite/Metal Film Technology

Solid surface antenna reflector of spacecraft played an important role in the area ofaerospace, information transmission, and even military, however the structural material andsurface functional graphic material of antenna reflector had a great difference in the terms ofphysical and chemical properties. Using laser to process the composite/metal filmcombinatorial materials with high-precision meant the structural material must undamagedand the functional layer must be processed accurately. How to manufacture large-formatmetal film graphic structure in three-dimensional complex curved surface with high-quality,high-precision and high-efficiency, had become the core technical problem of modernadvanced manufacturing.A1064nm fiber laser and a355nm all-solid-state ultraviolet laser were used fordirectly etching the copper layer of glass epoxy copper clad laminate （CCL）. The effects oflaser conditions and thinness of the copper layer on the processing quality （including depthand roughness） were studied. A new interface separate processing program as well wasproposed——after etching contour on the CCL, laser heated the copper layer by scanning ina proper focus distance, by vaporizing part of the organic substrate the copper layer wouldseparate from the substrate material and ultimately achieved the goal of selective etching theexperimental material. Experimental results and mechanism analysis showed that theinterface separate processing program had a better morphology and lower residual amount ofCu atoms, however the directly etching processing program was better in the repeatabilityand consistency, as well as processing efficiency.After the successful and high-quality implementation of processing composite/metalfilm system in two dimensions, fiber laser directly processing program was selected as themost suitable method of three-dimensional etching processing. Using the "3+2"three-dimensional processing system and three-dimensional laser processing technology thatdesigned by laboratory group, the two-dimensional etching technology was successfully applied to the three-dimensional curved surface. And by optimizing the size of the griddivision, laser could process the metal film of three-dimensional curved surface withhigh-quality, high-precision and high-efficiency.