Accession Number:

AD0713879

Title:

Preparation of the Chromium Carbides Cr7C3 and Cr23C6

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1970-08-12

Pagination or Media Count:

10.0

Abstract:

The study of preparation techniques of given chromium carbides was needed to obtain single phase carbides for determination of electrochemical and corrosion characteristics. Intercrystalline corrosion in Ni-Cr steel was correlated with the presence of these chromium carbides. The effect of temperature in the 1100-1500 degree centigrade range was studied on the composition of given products. At a temperature lower than the optimum the product contained given chromium carbides at a higher temperature, it contained given chromium carbides impurity. The single phase nearly stoichiometric chromium carbides given was prepared by on heating at 1400 degrees centigrade a briquetted charge of electrolytic chromium and lamp black in a hydrogen stream for 15 min. Two given mixtures were produced at a temperature below or above 1400 degrees centigrade respectively.

Subject Categories:

  • Inorganic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE