Accession Number : AD0786677

Title :   Design and Test of Selected High-Temperature Electrode Materials.

Descriptive Note : Final technical rept. 1 Oct 72-15 Nov 73,


Personal Author(s) : Nimmo,Robert A. ; Shanklin,R. ; Buechler,Lester W. ; Lytle,John

Report Date : JUL 1974

Pagination or Media Count : 99

Abstract : This report describes progress achieved on the design, fabrication, assembly, and test of four different electrode materials which were intended to cover the range of cold, intermediate and hot electrode operation. Included were LaCrO3 with strontium additions, calcia stabilized ZrO2, Hastelloy-X, and copper. The tests were designed to evaluate the electrode materials for improved power performance, reduced electrode voltage drop through reduced thermal barrier, and improved life. Also included in this report are details on an attempt to use a plasma-sprayed ceramic coating to reduce thermal losses in the MHD combustor. As a result of this program, it was concluded that Hastelloy-X or a similar superalloy should be considered for use as a future MHD-channel electrode material, particularly for pulse mode operation. Other advantages of superalloys over ceramic materials are longevity and ease of fabrication. (Modified author abstract)

Descriptors :   *Electrodes, *Magnetohydrodynamic generators, Zirconium oxides, Nickel alloys, Copper, Lanthanum compounds, Strontium, Combustors, Coatings, Test methods, Fabrication, Performance(Engineering), Calcium oxides, Heat loss, Heat transfer, Linings

Subject Categories : Electric Power Production and Distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE