Method of nondestructive quality control of carbon articles

Details Method of nondestructive quality control of carbon articles Method of nondestructive quality control of carbon articles

G - Physics

01

N

349/35

G01N 29/04 (2006.01) G01N 29/07 (2006.01)

Patent

CA 1283199

METHOD OF NONDESTRUCTIVE QUALITY CONTROL OF CARBON ARTICLES ABSTRACT The method of nondestructive quality control of car- bon articles includes determining the rate of propagation of excited acoustic vibrations in each carbon article of a group of carbon articles and in a specimen cut out from at least one carbon article. Then there are selected the car- bon articles with the lowest and highest determined rates of propagation of the acoustic vibrations, and "n" speci- mens are cut out from them longitudinally of the specimens, and "m" specimens are cut out from them across their longi- tudinal axes. The averaged values of the rate of propaga- tion of the acoustic vibrations in these selected carbon articles (3) and of their specific electric resistance are determined, respectively, from expressions: Image and Image . Their linear correlated relationship is plotted to define the range of the values of the specific electric resistance, and, hence, the range of the rate of propagation of the acoustic vibra- tions is the carbon articles, held representative of the quality of the carbon articles, and this range of the va- lues of the rate of propagation of the acoustic vibrations is used to pick up acceptable carbon articles.

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