Fluxless soldering of Ni--Au plated Kovar with a laser
Typical soldering processes use reactive fluxes to promote wetting. Most flux residues left after soldering must be removed with halogenated or CFC solvents. Recent legislation has mandated the reduction or elimination of the use of these solvents. There has consequently been a significant effort to develop alternative, environmentally conscious manufacturing technologies that will satisfy this objective. We are currently characterizing and developing a fluxless laser soldering process that will hermetically join Ni-Au electroplated Kovar lids and base plates. A test matrix was designed to investigate the effects of laser heating, joint design, and base/filler metal interactions on achieving fluxless soldering with a 100 watt CW Nd:YAG laser. Two solder alloys, 80In-15Pb-5Ag and 63SN-37Pb (wt. %), were used. Satisfactory solder joints were produced with both solder alloys, although the SnPb alloy gave relatively better wetting. Wetting generally increased with increasing laser power, decreasing beam spot size, and decreasing travel speed. The effects of the laser and processing parameters on fluxless soldering will be discussed. 9 refs., 5 figs., 1 tab.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5595991
- Report Number(s):
- SAND-90-3007C; CONF-910406-13; ON: DE91013261
- Resource Relation:
- Conference: Spring meeting of the Materials Research Society (MRS), Anaheim, CA (USA), 29 Apr - 3 May 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
KOVAR
SOLDERING
AIR POLLUTION ABATEMENT
CHLORINATED ALIPHATIC HYDROCARBONS
CLEANING
FLUORINATED ALIPHATIC HYDROCARBONS
HEAT TREATMENTS
INDIUM BASE ALLOYS
JOINTS
LASER-RADIATION HEATING
LEAD ALLOYS
NEODYMIUM LASERS
SILVER ALLOYS
TIN BASE ALLOYS
ALLOYS
COBALT ALLOYS
FABRICATION
HALOGENATED ALIPHATIC HYDROCARBONS
HEATING
INDIUM ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
LASERS
MANGANESE ADDITIONS
MANGANESE ALLOYS
NICKEL ALLOYS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PLASMA HEATING
POLLUTION ABATEMENT
SOLID STATE LASERS
TIN ALLOYS
WELDING
360101* - Metals & Alloys- Preparation & Fabrication