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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Interaction of chalcogenide glasses Ge-As-Se with hexagonal boron nitride
 Mastný, L. ; Matušek, M. ; Randáková, S. ; Brožek, Vlastimil
Chalcogenide glasses on the base Ge-As-Se for the applications in infrared optics may content only trace amount of oxygen, because the chemical bonds of the type Ge-O and As-O induce in chalcogenide glasses the generation of absorption bands at the wavelength about 12.8 μm with the consequence of the lowering of optical transmittance of chalcogenide glasses. That is why the chalcogenide glasses must be synthesized in the tubes from special conditioned quartz for to avoid the quartz will be the source of oxygen impurities. The tubes from this quartz are very expensive. The aim of this works is to point out that the chalcogenide glasses may be synthesized also in the tubes from turbostratic hexagonal boron nitride which is refined in the mixture of trichloromethane and ammonia.
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Tungsten cermets with zirconium and hafnium carbides
 Brožek, Vlastimil ; Ctibor, Pavel ; Matušek, M. ; Sedláček, J.
Cermets with tungsten matrix and functional components of ZrC and HfC with absolutely highest meeting points are materials with good properties at high temperature exposure. Tungsten based cermets with 10, 20 and 30 % of the functional component were prepared by two different procedures and their properties were compared. The first series of the samples was manufactured by powder metallurgy. A homogenized and preformed mixture of powders was sintered at 2000°C and pressure 6 GPa by hot-pressing technique in the apparatus of BELT-type. The second series was prepared by plasma spraying with water-stabilized plasma WSP® by two different procedures. In the first case the powders of W and ZrC (or W and HfC) were injected into the plasma jet by two separate feeders. The feeding distance 25 to 75 mm was affected by different kinetic parameters, different size distribution and density. The second case represents deposition of pre-spheroidized powder mixtures prepared by spray drying
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