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Title: Glass ceramics for sealing to high-thermal-expansion metals

Abstract

Glass ceramics were studied, formulated in the Na/sub 2/O CaO.P/sub 2/O/sub 5/, Na/sub 2/O.BaOP/sub 2/O/sub 5/, Na/sub 2/O.Al/sub 2/O/sub 3/.P/sub 2/O/sub 5/, and Li/sub 2/O.BaO.P/sub 2/O/sub 5/ systems to establish their suitability for sealing to high thermal expansion metals, e.g. aluminum, copper, and 300 series stainless steels. Glass ceramics in Na/sub 2/O.CaO.P/sub 2/O/sub 5/ and Na/sub 2/O.BaO.P/sub 2/O/sub 5/ systems have coefficients of thermal expansion in the range 140 x 10/sup -1/ per /sup 0/C less than or equal to ..cap alpha.. less than or equal to 225 x 10/sup -7/ per /sup 0/C and fracture toughness values generally greater than those of phosphate glasses; they are suitable for fabricating seals to high thermal expansion metals. Crystal phases include NaPo/sub 3/, (NaPO/sub 3/)/sub 3/, NaBa(PO/sub 3/)/sub 3/, and NaCa(PO/sub 3/)/sub 3/. Glass ceramics formed in the Na/sub 2/O.Al/sub 2/O/sub 3/.P/sub 2/O/sub 5/ systems have coefficients of thermal expansion greater than 240 x 10/sup -7/ per /sup 0/C, but they have extensive microcracking. Due to their low thermal expansion values (..cap alpha.. less than or equal to 120 x 10/sup -7/ per /sup 0/C), glass ceramics in the Li/sub 2/O.BaO.P/sub 2/O/sub 5/ system are unsuitable for sealing to high thermal expansionmore » metals.« less

Authors:
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (USA)
Sponsoring Org.:
USDOE
OSTI Identifier:
6574052
Report Number(s):
SAND-80-2192
TRN: 81-006712
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; JOINING; CERAMICS; COPPER; ELECTRON TUBES; SEALS; GLASS; FABRICATION; STAINLESS STEELS; ALUMINIUM OXIDES; BARIUM OXIDES; CALCIUM OXIDES; LITHIUM OXIDES; PHOSPHORUS OXIDES; SODIUM OXIDES; THERMAL EXPANSION; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; ALLOYS; ALUMINIUM COMPOUNDS; BARIUM COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; CHROMIUM ALLOYS; CORROSION RESISTANT ALLOYS; ELEMENTS; EXPANSION; IRON ALLOYS; IRON BASE ALLOYS; LITHIUM COMPOUNDS; METALS; OXIDES; OXYGEN COMPOUNDS; PHOSPHORUS COMPOUNDS; SODIUM COMPOUNDS; STEELS; TRANSITION ELEMENTS; 360601* - Other Materials- Preparation & Manufacture

Citation Formats

Wilder, Jr., J. A. Glass ceramics for sealing to high-thermal-expansion metals. United States: N. p., 1980. Web. doi:10.2172/6574052.
Wilder, Jr., J. A. Glass ceramics for sealing to high-thermal-expansion metals. United States. https://doi.org/10.2172/6574052
Wilder, Jr., J. A. Wed . "Glass ceramics for sealing to high-thermal-expansion metals". United States. https://doi.org/10.2172/6574052. https://www.osti.gov/servlets/purl/6574052.
@article{osti_6574052,
title = {Glass ceramics for sealing to high-thermal-expansion metals},
author = {Wilder, Jr., J. A.},
abstractNote = {Glass ceramics were studied, formulated in the Na/sub 2/O CaO.P/sub 2/O/sub 5/, Na/sub 2/O.BaOP/sub 2/O/sub 5/, Na/sub 2/O.Al/sub 2/O/sub 3/.P/sub 2/O/sub 5/, and Li/sub 2/O.BaO.P/sub 2/O/sub 5/ systems to establish their suitability for sealing to high thermal expansion metals, e.g. aluminum, copper, and 300 series stainless steels. Glass ceramics in Na/sub 2/O.CaO.P/sub 2/O/sub 5/ and Na/sub 2/O.BaO.P/sub 2/O/sub 5/ systems have coefficients of thermal expansion in the range 140 x 10/sup -1/ per /sup 0/C less than or equal to ..cap alpha.. less than or equal to 225 x 10/sup -7/ per /sup 0/C and fracture toughness values generally greater than those of phosphate glasses; they are suitable for fabricating seals to high thermal expansion metals. Crystal phases include NaPo/sub 3/, (NaPO/sub 3/)/sub 3/, NaBa(PO/sub 3/)/sub 3/, and NaCa(PO/sub 3/)/sub 3/. Glass ceramics formed in the Na/sub 2/O.Al/sub 2/O/sub 3/.P/sub 2/O/sub 5/ systems have coefficients of thermal expansion greater than 240 x 10/sup -7/ per /sup 0/C, but they have extensive microcracking. Due to their low thermal expansion values (..cap alpha.. less than or equal to 120 x 10/sup -7/ per /sup 0/C), glass ceramics in the Li/sub 2/O.BaO.P/sub 2/O/sub 5/ system are unsuitable for sealing to high thermal expansion metals.},
doi = {10.2172/6574052},
url = {https://www.osti.gov/biblio/6574052}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {10}
}