| 摘要 |
<p>PCT No. PCT/SU86/00117 Sec. 371 Date Nov. 4, 1987 Sec. 102(e) Date Nov. 4, 1987 PCT Filed Nov. 20, 1986 PCT Pub. No. WO87/05392 PCT Pub. Date Sep. 11, 1987.A method of nondestructive quality control of carbon articles includes the steps of determining the rate of propagation of excited acoustic vibrations in each carbon article (3) of a group of carbon articles and in a specimen cut out from at least one carbon article (3). Then there are selected the carbon articles (3) with the lowest and highest determined rates of propagation of the acoustic vibrations, and "n" specimens are cut out from them longitudinally of the specimens, and "m" specimens are cut out from them across their longitudinal axes. The averaged values of the rate of propagation of the acoustic vibrations in these selected cabron articles (3) and of their specific electric resistance are determined, respectively, from expressions: <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 vibrations in the carbon articles (3), held representative of the quality of the carbon articles (3), and this range of the values of the rate of propagation of the acoustic vibrations is used to select acceptable carbon articles (3).</p> |
