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Title: Screen-printing of 1720 and 7059 glass insulating bonds for the radioisotopic thermoelectric generator

Abstract

As part of the RTG fabrication sequence, Si/Ge and Si/Ge-glass substrates are coated with Corning 1720 and 7059 glass by a screen-printing process. A slurry of glass, pine oil, and terpinol is printed, followed by a burnout of the organic matter in oxygen at 500 deg C. It has been determined from overall fabrication considerations that there should be sufficient glass present to yield a fused-glass thickness of 1.2 to 1.4 mils. Glass content of the slurry, screen size, squeegee pressure, and breakaway distance are the important parameters affecting the amount of glass printed. Less variability in glass thickness is experienced when the screen contacts the substrate during printing. This occurs at higher squeegee pressures. The desired glass thickness is achieved by adjusting the glass content of the slurry to the screen mesh size, i.e., less glass is needed for an 80-mesh screen than for a 105mesh screen. Not all of the slurry is retained on the substrate during printing; the fraction adhering to the screen is a function of the breakaway distance. Moderate slurry viscosity and temperature changes during screen printing have only minor effects on the thickness of the glass deposited. Routine printing of 1720 and 7059 glassmore » slurries with 65- and 70-% glass have consistently yielded glass thicknesses between 1.2 and 1.4 mils. (auth)« less

Authors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
4381561
Report Number(s):
SLA-73-80
NSA Number:
NSA-29-012655
DOE Contract Number:  
AT(29-1)-789
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 30-JUN-74
Country of Publication:
United States
Language:
English
Subject:
N42100* -Engineering-Energy Conversion; N50120 -Metals, Ceramics, & Other Materials-Ceramics & Cermets-Preparation & Fabrication; *GLASS- COATINGS; *THERMOCOUPLES- FABRICATION; *THERMOELECTRIC GENERATORS- THERMOCOUPLES; BONDING; DIELECTRIC MATERIALS; GERMANIUM; RADIOISOTOPE HEAT SOURCES; SILICON; NESDPS Office of Nuclear Energy Space and Defense Power Systems

Citation Formats

Jennings, C W. Screen-printing of 1720 and 7059 glass insulating bonds for the radioisotopic thermoelectric generator. United States: N. p., 1973. Web. doi:10.2172/4381561.
Jennings, C W. Screen-printing of 1720 and 7059 glass insulating bonds for the radioisotopic thermoelectric generator. United States. https://doi.org/10.2172/4381561
Jennings, C W. 1973. "Screen-printing of 1720 and 7059 glass insulating bonds for the radioisotopic thermoelectric generator". United States. https://doi.org/10.2172/4381561. https://www.osti.gov/servlets/purl/4381561.
@article{osti_4381561,
title = {Screen-printing of 1720 and 7059 glass insulating bonds for the radioisotopic thermoelectric generator},
author = {Jennings, C W},
abstractNote = {As part of the RTG fabrication sequence, Si/Ge and Si/Ge-glass substrates are coated with Corning 1720 and 7059 glass by a screen-printing process. A slurry of glass, pine oil, and terpinol is printed, followed by a burnout of the organic matter in oxygen at 500 deg C. It has been determined from overall fabrication considerations that there should be sufficient glass present to yield a fused-glass thickness of 1.2 to 1.4 mils. Glass content of the slurry, screen size, squeegee pressure, and breakaway distance are the important parameters affecting the amount of glass printed. Less variability in glass thickness is experienced when the screen contacts the substrate during printing. This occurs at higher squeegee pressures. The desired glass thickness is achieved by adjusting the glass content of the slurry to the screen mesh size, i.e., less glass is needed for an 80-mesh screen than for a 105mesh screen. Not all of the slurry is retained on the substrate during printing; the fraction adhering to the screen is a function of the breakaway distance. Moderate slurry viscosity and temperature changes during screen printing have only minor effects on the thickness of the glass deposited. Routine printing of 1720 and 7059 glass slurries with 65- and 70-% glass have consistently yielded glass thicknesses between 1.2 and 1.4 mils. (auth)},
doi = {10.2172/4381561},
url = {https://www.osti.gov/biblio/4381561}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Dec 01 00:00:00 EST 1973},
month = {Sat Dec 01 00:00:00 EST 1973}
}