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Title: Advanced materials for aerospace and biomedical applications: New glasses for hermetic titanium seals

Abstract

Titanium and titanium alloys have an outstanding strength-to-weight ratio and corrosion resistance and so are materials of choice for a variety of aerospace and biomedical applications. Such applications are limited by the lack of a viable hermetic glass sealing technology. Conventional silicate sealing glasses are readily reduced by titanium to form interfacial silicides that are incompatible with a robust glass/metal seal. Borate-based glasses undergo a similar thermochemistry and are reduced to a titanium boride. The kinetics of this reactions, however, are apparently slower and so a deleterious interface does not form. Chemically durable lanthanoborate glasses were examined as candidate sealing compositions. The compositions, properties, and structures of several alkaline earth, alumina, and titania lanthanoborate glass forming systems were evaluated and this information was used as the basis for a designed experiment to optimize compositions for Ti-sealing. A number of viable compositions were identified and sealing procedures established. Finally, glass formation, properties, and structure of biocompatible Fe{sub 2}O{sub 3}- and TiO{sub 2}-doped calcium phosphate systems were also evaluated.

Authors:
; ;  [1]
  1. and others
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Financial Management and Controller, Washington, DC (United States)
OSTI Identifier:
510597
Report Number(s):
SAND-96-2772
ON: DE97007937; TRN: 97:004729
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Nov 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TITANIUM; COMPATIBILITY; TITANIUM ALLOYS; LANTHANUM OXIDES; MICROSTRUCTURE; BORATES; CORROSION RESISTANCE; SEALS; PHYSICAL PROPERTIES; INTERFACES; RAMAN SPECTRA; SEALING MATERIALS; NMR SPECTRA; ALUMINIUM 27; TITANIUM OXIDES; ALUMINIUM OXIDES; CALCIUM OXIDES

Citation Formats

Brow, R.K., Tallant, D.R., and Crowder, S.V. Advanced materials for aerospace and biomedical applications: New glasses for hermetic titanium seals. United States: N. p., 1996. Web. doi:10.2172/510597.
Brow, R.K., Tallant, D.R., & Crowder, S.V. Advanced materials for aerospace and biomedical applications: New glasses for hermetic titanium seals. United States. doi:10.2172/510597.
Brow, R.K., Tallant, D.R., and Crowder, S.V. Fri . "Advanced materials for aerospace and biomedical applications: New glasses for hermetic titanium seals". United States. doi:10.2172/510597. https://www.osti.gov/servlets/purl/510597.
@article{osti_510597,
title = {Advanced materials for aerospace and biomedical applications: New glasses for hermetic titanium seals},
author = {Brow, R.K. and Tallant, D.R. and Crowder, S.V.},
abstractNote = {Titanium and titanium alloys have an outstanding strength-to-weight ratio and corrosion resistance and so are materials of choice for a variety of aerospace and biomedical applications. Such applications are limited by the lack of a viable hermetic glass sealing technology. Conventional silicate sealing glasses are readily reduced by titanium to form interfacial silicides that are incompatible with a robust glass/metal seal. Borate-based glasses undergo a similar thermochemistry and are reduced to a titanium boride. The kinetics of this reactions, however, are apparently slower and so a deleterious interface does not form. Chemically durable lanthanoborate glasses were examined as candidate sealing compositions. The compositions, properties, and structures of several alkaline earth, alumina, and titania lanthanoborate glass forming systems were evaluated and this information was used as the basis for a designed experiment to optimize compositions for Ti-sealing. A number of viable compositions were identified and sealing procedures established. Finally, glass formation, properties, and structure of biocompatible Fe{sub 2}O{sub 3}- and TiO{sub 2}-doped calcium phosphate systems were also evaluated.},
doi = {10.2172/510597},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {11}
}