Gold-plated covers are extensively utilized in the hermetic ceramic packaging of integrated circuits,where surface identification is commonly achieved through ink transfer printing and laser marking processes.Character detachment is frequently observed during screening or testing when using ink transfer printing.Laser marking,on the other hand,can prevent character detachment fundamentally,although its character recognition is currently slightly less effective than that of ink transfer printing.This study investigates the laser marking parameters for gold-plated covers,identifying the optimal parameters for marking and addressing the issue of unclear characters in laser-marked covers.The thickness of the gold plating layer in the laser-marked area on gold-plated covers is found to remain largely unchanged through scanning electron microscopy and cross-sectional analysis.Samples laser-marked with optimized parameters have successfully undergone reliability tests,including temperature cycling,thermal shock,solvent resistance,and salt spray,in accordance with GJB548C standards,offering guidance within the industry.
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