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Method for Preventing Deposition of Inorganic Stains or Corrosion Products on MLC Substrates During Wet Processing

IP.com Disclosure Number: IPCOM000040572D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Lamelas, FJ: AUTHOR [+2]

Abstract

This article addresses the prevention of MLC (multilayer ceramic) substrate staining while substrates are undergoing metallization processes. The disclosed in process change avoids adding a final cleaning process step to the existing metallization procedures, effectively contributing to the elimination of potential substrate losses due to MSV (multiple solder voids) or metal adhesion failures. Small amounts of a chelating agent EDTA (ethylene diamine tetra-acetic acid) and sodium citrate are added to the water baths used in the existing plating or cladding process steps to accomplish this result. In the plating process operations, the identified chelating solution is added to any water baths where MLC substrates remain immersed for greater than 5-minute periods, i.e.

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Method for Preventing Deposition of Inorganic Stains or Corrosion Products on MLC Substrates During Wet Processing

This article addresses the prevention of MLC (multilayer ceramic) substrate staining while substrates are undergoing metallization processes. The disclosed in process change avoids adding a final cleaning process step to the existing metallization procedures, effectively contributing to the elimination of potential substrate losses due to MSV (multiple solder voids) or metal adhesion failures. Small amounts of a chelating agent EDTA (ethylene diamine tetra-acetic acid) and sodium citrate are added to the water baths used in the existing plating or cladding process steps to accomplish this result. In the plating process operations, the identified chelating solution is added to any water baths where MLC substrates remain immersed for greater than 5-minute periods, i.e., holding tanks in which MLC substrates are retained as a result of plating autoline backlogs. In the cladding process operation, the chelating solution is added to water contained in the ultrasonic tools. Addition of the disclosed chelating solution, in the proportions of 2.25 grams of EDTA and 0.75 grams of sodium citrate per liter of DI (deionized) water, has been found satisfactory in preventing the formation of problem stains on clad MLC substrates that have been immersed for 20 hours.

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