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Title: DETERMINATION OF THE EMISSIVITY OF MATERIALS. Quarterly Progress Report, July 1 through September 30, 1963

Abstract

A screening rig was constructed to enable preliminary evaluation of coating behavior at elevated temperatures and to avoid coating volatilization in the emittance rigs. Three materials have been tested to date, namely, Kennanmetals K-151A and K-162B and iron titanate. The Kennametals were found to be stable up to 1600'F and the iron titanate up to 2000 deg F. Emittance measurements were made for coatings of Kennannetals K-151A, K-182B, nickel-chrome spinel, calcium titanate, and iron titanate. Values obtained for the Kennametals ranged between 0.82 and 0.89 in the 800 to 1600 deg F temperature range and were in good agreement with data obtained by other investigators. Emittance values obtained during the endurance testing of a nickelchrome spinel coating were lower than anticipated, but testing a subsequent specimen coated by a modified plasmaarc spraying technique produced values of 0.90 between 800 and 1800 deg F. Testing of a specimen coated with calcium titanate by a modified aluminum- phosphate bonding technique indicated that the resulting coating had increased stability and a higher overall emittance than previously obtained. Evaluation of the endurance properties of plasma-arc sprayed calcium titanate coatings indicated that emittance values of 0.90 cannot be obtained if the specimen is initially exposedmore » to 1000 deg F, although such values can be obtained by directly heating the specimen to 1400 or 1500 deg F. Continuation of an endurance test of an iron titanate-coated specimen during the last reporting period, produced emittance values between 0.82 and 0.85 whereas values of 0.86 to 0.87 were obtained previously. Post-test analysis of the radiator segments subjected to long term endurance testing in conjunction with the NASA space power systems program commenced with a residual gas analysis of the atmosphere in the chamber containing the SNAP-8 fin coated with silicon carbide and silica. An attempt to apply a silicon carbide coating by aluminum phosphate bonding using the techniqae developed during the last reporting period resulted in unsatisfactory bonding. Additional coatings have been applied by a new technique and these appear to be more satisfactory although testing at elevated temperatures has not yet been conducted. (auth)« less

Authors:
Publication Date:
Research Org.:
Pratt and Whitney Aircraft Div., United Aircraft Corp., Hartford, Conn.
OSTI Identifier:
4133313
Report Number(s):
PWA-2279
NSA Number:
NSA-18-004257
DOE Contract Number:  
NASW-104
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-64
Country of Publication:
United States
Language:
English
Subject:
METALS, CERAMICS, AND OTHER MATERIALS; ALUMINUM OXIDES; ALUMINUM PHOSPHATES; BONDING; CALCIUM COMPOUNDS; CHROMIUM ALLOYS; COATING; ELECTRIC ARCS; EMISSION; GASES; HEATING; HIGH TEMPERATURE; IRON COMPOUNDS; MAGNESIUM OXIDES; MATERIALS TESTING; MEASURED VALUES; MINERALS; NICKEL ALLOYS; OXIDES; PLASMA; QUANTITATIVE ANALYSIS; SILICON CARBIDES; SILICON OXIDES; SNAP-8 SERIES; SPACE; SPINELS; STABILITY; TITANIUM OXIDES

Citation Formats

Hayes, R J. DETERMINATION OF THE EMISSIVITY OF MATERIALS. Quarterly Progress Report, July 1 through September 30, 1963. United States: N. p., 1964. Web.
Hayes, R J. DETERMINATION OF THE EMISSIVITY OF MATERIALS. Quarterly Progress Report, July 1 through September 30, 1963. United States.
Hayes, R J. Sat . "DETERMINATION OF THE EMISSIVITY OF MATERIALS. Quarterly Progress Report, July 1 through September 30, 1963". United States.
@article{osti_4133313,
title = {DETERMINATION OF THE EMISSIVITY OF MATERIALS. Quarterly Progress Report, July 1 through September 30, 1963},
author = {Hayes, R J},
abstractNote = {A screening rig was constructed to enable preliminary evaluation of coating behavior at elevated temperatures and to avoid coating volatilization in the emittance rigs. Three materials have been tested to date, namely, Kennanmetals K-151A and K-162B and iron titanate. The Kennametals were found to be stable up to 1600'F and the iron titanate up to 2000 deg F. Emittance measurements were made for coatings of Kennannetals K-151A, K-182B, nickel-chrome spinel, calcium titanate, and iron titanate. Values obtained for the Kennametals ranged between 0.82 and 0.89 in the 800 to 1600 deg F temperature range and were in good agreement with data obtained by other investigators. Emittance values obtained during the endurance testing of a nickelchrome spinel coating were lower than anticipated, but testing a subsequent specimen coated by a modified plasmaarc spraying technique produced values of 0.90 between 800 and 1800 deg F. Testing of a specimen coated with calcium titanate by a modified aluminum- phosphate bonding technique indicated that the resulting coating had increased stability and a higher overall emittance than previously obtained. Evaluation of the endurance properties of plasma-arc sprayed calcium titanate coatings indicated that emittance values of 0.90 cannot be obtained if the specimen is initially exposed to 1000 deg F, although such values can be obtained by directly heating the specimen to 1400 or 1500 deg F. Continuation of an endurance test of an iron titanate-coated specimen during the last reporting period, produced emittance values between 0.82 and 0.85 whereas values of 0.86 to 0.87 were obtained previously. Post-test analysis of the radiator segments subjected to long term endurance testing in conjunction with the NASA space power systems program commenced with a residual gas analysis of the atmosphere in the chamber containing the SNAP-8 fin coated with silicon carbide and silica. An attempt to apply a silicon carbide coating by aluminum phosphate bonding using the techniqae developed during the last reporting period resulted in unsatisfactory bonding. Additional coatings have been applied by a new technique and these appear to be more satisfactory although testing at elevated temperatures has not yet been conducted. (auth)},
doi = {},
url = {https://www.osti.gov/biblio/4133313}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1964},
month = {10}
}

Technical Report:
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