New apparatus allows accurate simultaneous measurement of thermal conductivity, electrical resistivity, and thermopower for technically important materials, such as new or uncommon alloys. A list of materials investigated is presented. Sources for obtaining data on these materials, as well as the source giving a description of the apparatus, are cited

Hust, J. G.

Powell, R. L.

Weitzel, D. H.

English

NASA Technical Reports Server

June 1970
	 Brief 70- 103 10 
•
114Y C
AEC-NASA TECH BRIEF 
AEC-NASA Tech Briefs announce new technology derived from the research and development program of the U.S. AEC or 
from AEC-NASA interagency efforts.They are issued to encourage commercial application. Tech Briefs are available on a 
subscription basis from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Requests for individual copies or questions relating to the Tech Brief program may be directed to the Technology Utilization 
Division, NASA, Code UT, Washington, D.C. 20546. 
High Precision Cryogenic Thermal Conductivity Standards 
Data on the low-temperature thermal and electrical 
properties of new materials are urgently needed. Ther-
mal and electrical conductivity data in the tempera-
ture range from 4° to 300°K are currently available 
only to an accuracy of 5%for most technically im-
portant solids. For many materials, especially new or 
uncommon alloys, measured values cannot be found. 
However, technology iri the near future will require 
that these properties be known to an accuracy of 1% 
or better. 
A need also exists for established reference data for 
standard materials or specimens. Measurements re-
ported from different sources often differ by large 
amounts. 
Apparatus has been constructed which allows the 
simultaneous measurement of thermal conductivity, 
electrical resistivity, and thermopower with accuracies 
of 1 to 2%, 0.2%, and 0.5k V/°K, respectively. The 
following materials have been investigated: titanium 
alloy A 110-AT, aluminum alloy 7039, Inconel 718, 
Hastelloy X, reactor grade beryllium, P0-3 graphite, 
and Armco iron. Details of the apparatus used in 
these measurements are presented in the first report 
cited below, and the data obtained are presented as 
basic reference tables and graphs for the first six 
materials. Detailed data for Armco iron are presented 
in the second referenced report.
References: 
1. Thermal Conductivity, Electrical Resistivity, and 
Thermopower of Aerospace Alloys from 4° to 
300'K, National Bureau of Standards, Report 9732, 
June 1969. 
2. Thermal Conductivity Standard Reference Mate-
rials from 4° to 300°K. 1. Armco Iron, National 
Bureau of Standards, Report 9740, August 1969. 
Note: 
Reprints of the above reports can be obtained from: 
Technology Utilization Officer 
AEC-NASA Space Nuclear 
Propulsion Office 
U.S. Atomic Energy Commission 
Washington, D.C. 20545 
Reference: B70-10310 
Patent status: 
No patent action is contemplated by the AEC or 
NASA:
Source: J; G. Hust, D. H. Weitzel, 
and R. L. Power of
Cryogenic Division, Institute for Basic

Standards, NBS
under contract to

Space Nuclear Propulsion Office

(NUC-10555 & -10556) 
Category 04 
This document was prepared under the sponsorship of the Atomic 
Energy Commission and/or the National Aeronautics and Space 
Administration. Neither the United States Government nor any per-
son acting on behalf of the United States Government assumes any
liability resulting from the use of the information contained in this 
document, or warrants that the use of any information, apparatus, 
method, or process disclosed in this document may not infringe pri-
vately owned rights.
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High precision cryogenic thermal conductivity standards

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