The present work was undertaken with the aim of carrying out an x-ray diffraction analysis of ultrafine boron nitride powders of different mean particle sizes. The specific surfaces of the powders, determined by the low-temperature krypton adsorption method, were 650, 470, and 260 sq m/g. Electron microscopical examinations revealed that the specimens consisted of separate, irregular-shaped particles with smoothed-out boundaries. The mean particle sizes, calculated from the specific surfaces, were ...
In the investigated range of a change of the parameters mu characteristic for turbines of GTD, the intensity of heat exchange in air-cooled blades, measured during tests at static installations and in turbine stages under conditions of rotation, remains constant. The experimental data, obtained at static installations, can be common for work conditions of blades under turbines, which substantially simplifies the procedure of experiment and the construction of test benches. ...
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