Survey of unclassified literature furthers design and development of nuclear thermionic converter seals. Data cover topics which are particularly relevant to thermionics. Data are reviewed and review discussion is presented along with summary of earlier work

Phillips, W. M.

English

NASA Technical Reports Server

May 1971	 Brief 71-10116 
NASA TECH BRIEF 
NASA Pasadena Office
	 W 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield; Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Metal-to-Ceramic Seals: A Literature Survey 
A survey of the unclassified literature on the 
technology of metal-to-ceramic seals was conducted 
in order to obtain information that would further 
the design and development of such seals for nuclear 
thermionic converters. Previous surveys, though ex-
tensive, did not cover recent progress in this tech-
nology. 
The more recent data available covers such topics 
as radiation damage to ceramics, alkali metal cor-
rosion, active-metal brazing techniques, and graded 
• cermet seal characteristics, all of which are particu-
larly relevant to the field of thermionics. These 
data are reviewed, and a discussion of that review 
is presented, along with a summary of the earlier 
work in the field. 
The report covers the topics mentioned, as well 
as diffusion bonding, techniques currently used in 
thermionic diodes, various types of brazing tech-
niques, corrosion testing of seals and components, 
and certain types of seals now being used.
Reference: 
State-of-the-Art Review of Ceramic-to-Metal Join-
ing, AFML-TR-65-143, Air Force Materials Lab-
oratory, Wright-Patterson AFB, Ohio. May 1965. 
Note: 
The following documentation may be obtained 
from:
National Technical Information Service 
Springfield, Virginia 22151 
Single document price $3.00 
(microfiche $0.95) 
Reference: 
JPL Technical Report 34-1420 (N70-19773), 
Metal-to-Ceramic Seals for Thermionic Con-
verters: A Literature Survey 
Patent status: 
No patent action is contemplated by NASA. 
Source: W. M. Phillips of

Caltech/JPL under
under contract to

NASA Pasadena Office

(NPO-1 1430) 
Category 03,08 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned.rights.
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Metal-to-ceramic seals - A literature survey

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