Add time:08/17/2019         Source:sciencedirect.com

A novel method for manufacture of copper(II) oxide for copper electroplating solution is proposed in this paper. The copper(II) oxide was produced through two chemical reaction steps without sintering process after refinement of waste lead frame etching solution. The experimental major parameters were the amount of additives for first and second step, sodium carbonate and sodium hydroxide, respectively, to evaluate reaction characteristics. Also, the liquidity (angle of repose), solubility to sulfuric acid, chloric ion concentration and thickness of dimple thickness of plating hole were verified for the physical properties of copper(II) oxide as electroplating material.The reaction molar ratio of sodium carbonate was low, and Cu2CO3 was generated more than Cu(OH)2.The optimum reaction mole ratio of sodium carbonate to copper chloride was revealed as 1.5. The optimum usage of sodium hydroxide for manufacture of copper(II) oxide using basic copper carbonate, produced at first reaction step, was 150 g. In these conditions, the average particle size of copper(II) oxide, the dissolution time for sulfuric acid, and the angle of repose were 21.49 μm, 62 s, and 35.5°, respectively. The yield of copper(II) oxide was 98.0 wt.%, for this optimum usage. Also, the via-filling hole thickness was 13.5 μm, which satisfies general via-filling hole thickness range, less than 15 μm.

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