Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Evaluation of Selected Spinels and Perovskites as Candidate High- temperature Molybdenum Coatings.

Authors
Glenn-ML; Henry-JL; Adams-A
Source
NTIS: PB 295 873 :32 pages
Link
NIOSHTIC No.
10007933
Abstract
As part of its goal to minimize requirements for mineral commodities through conservation and substitution, the Bureau of Mines conducted research to develop molybdenum as a potential substitute for superalloys containing the strategic and critical materials, nickel, chromium, and cobalt. Since molybdenum requires protection from oxidation at high temperatures, several complex oxides of the spinel and perovskite structure were investigated to determine which possessed the greatest potential for use as oxidation-barrier coatings. Two spinels (mgcr2o4 and mgal2o4) and five perovskites (bahfo3, ycro3, ndcro3, bazro3, and lacro3) were selected for testing. Various high-temperature properties that are important for oxidation-resistant coatings were examined, including diffusion rates of oxygen and molybdenum, recession (vaporization) rates, hardness, erosion resistance, sinterability, reactivity with molybdenum, and ease of application. From the evaluation of high- temperature properties, two spinels (mgcr2o4 and mgal2o4) stand above the other oxides as possible coatings for molybdenum. However, laboratory coatings of mgcr2o4 at 1,360 deg c (2,480 deg f) are equivalent or inferior to currently available mosi2 coatings; laboratory coatings of mgal2o4 may be comparable under limited conditions to currently available mosi2 coatings at the same temperature.
Publication Date
19790101
Document Type
IH; Report of Investigation;
Fiscal Year
1979
NTIS Accession No.
PB-295873
NTIS Price
A04
Identifying No.
RI 8351
NIOSH Division
ALRC;
Source Name
NTIS: PB 295 873
TOP