skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 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 A
Application Number:
PPN: US 7-516935
Assignee:
Dept. of Energy, Washington, DC (United States) SNL; EDB-94-110347
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 = {1991},
month = {9}
}