Development of high thermal expansion glasses for sealing to aluminum alloys, I

Technical Report · Wed Nov 01 04:00:00 EST 1978

OSTI ID:5739442

Wilder, Jr, J A

The feasibility of using phosphate glasses as insulator materials which can be hermetically sealed to aluminum alloys was examined. Control of selected properties was achieved by compositional variation. A series of glasses was produced with thermal expansion coefficients of 160 to 260 x 10/sup -7/ /sup 0/C/sup -1/ (aluminum = 235 x 10/sup -7/ /sup 0/C/sup -1/). Helium permeabilities of 5 x 10/sup 8/ (atoms/s-cm-atm) at 25/sup 0/C are about equal to the glass-ceramic currently used in neutron tubes. Leach rates in water similar to those of window glass of approximately 1.2 x 10/sup -8/ (gm/cm/sup 2/ - min) were attained. The fracture toughness of these glasses, 0.4 MPa - m/sup 1/2/, is approximately 1/2 that of silicate glasses. Several of these glasses have been hermetically sealed to 6061-TO aluminum alloy.

• Research Organization: Sandia Labs., Albuquerque, NM (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 5739442
• Report Number(s): SAND-78-1694
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
360602 -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
BORON COMPOUNDS
BORON OXIDES
CHALCOGENIDES
CRYOGENIC FLUIDS
DIFFUSION
DISSOLUTION
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELEMENTS
EQUIPMENT
EXPANSION
FLUIDS
FRACTURE PROPERTIES
GERMANIUM COMPOUNDS
GERMANIUM OXIDES
GLASS
HELIUM
INTERFACES
LEACHING
MECHANICAL PROPERTIES
MELTING
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RARE GASES
SEALS
SEPARATION PROCESSES
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THERMAL EXPANSION