Ammonia-treated phosphate glasses useful for sealing to metals
Abstract
A method of improving surface-dependent properties of phosphate glass such as durability and wear resistance without significantly affecting its thermal expansion coefficient is provided which comprises annealing the glass in a dry ammonia atmosphere at temperatures approximating the transition temperature of the glass. The ammonia annealing treatment of the present invention is carried out for a time sufficient to allow incorporation of a thin layer of nitrogen into the surface of the phosphate glass, and the treatment improves the durability of the glass without the reduction in the thermal expansion coefficient that has restricted the effectiveness of prior ammonia treatments. The improved phosphate glass resulting from this method is superior in wear resistance, yet maintains suitable thermal expansion properties so that it may be used effectively in a variety of applications requiring hermetic glass-metal seals.
- Inventors:
- Issue Date:
- OSTI Identifier:
- 7276720
- Patent Number(s):
- 5045508
- Application Number:
- PPN: US 7-516935
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 30 Apr 1990
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; PHOSPHATE GLASS; ANNEALING; THERMAL EXPANSION; WEAR RESISTANCE; AMMONIA; CONTROLLED ATMOSPHERES; SURFACE TREATMENTS; USES; ATMOSPHERES; EXPANSION; GLASS; HEAT TREATMENTS; HYDRIDES; HYDROGEN COMPOUNDS; MECHANICAL PROPERTIES; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; 360601* - Other Materials- Preparation & Manufacture; 360603 - Materials- Properties; 360606 - Other Materials- Physical Properties- (1992-)
Citation Formats
Brow, R K, and Day, D E. Ammonia-treated phosphate glasses useful for sealing to metals. United States: N. p., 1991.
Web.
Brow, R K, & Day, D E. Ammonia-treated phosphate glasses useful for sealing to metals. United States.
Brow, R K, and Day, D E. Tue .
"Ammonia-treated phosphate glasses useful for sealing to metals". United States.
@article{osti_7276720,
title = {Ammonia-treated phosphate glasses useful for sealing to metals},
author = {Brow, R K and Day, D E},
abstractNote = {A method of improving surface-dependent properties of phosphate glass such as durability and wear resistance without significantly affecting its thermal expansion coefficient is provided which comprises annealing the glass in a dry ammonia atmosphere at temperatures approximating the transition temperature of the glass. The ammonia annealing treatment of the present invention is carried out for a time sufficient to allow incorporation of a thin layer of nitrogen into the surface of the phosphate glass, and the treatment improves the durability of the glass without the reduction in the thermal expansion coefficient that has restricted the effectiveness of prior ammonia treatments. The improved phosphate glass resulting from this method is superior in wear resistance, yet maintains suitable thermal expansion properties so that it may be used effectively in a variety of applications requiring hermetic glass-metal seals.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 03 00:00:00 EDT 1991},
month = {Tue Sep 03 00:00:00 EDT 1991}
}