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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Evaluation of properties of pyrolysed resins
 Halasová, M. ; Chlup, Zdeněk ; Strachota, Adam ; Černý, Martin ; Dlouhý, Ivo
The presented work describes mechanical properties of materials prepared by pyrolysis of polysiloxane resins. The polymeric precursors had different chemical composition. Materials under investigation are predetermined as a matrix for high temperature resistant long fibre composites. An instrumented hardness tester was employed for materials characterisation. The Vickers hardness, Martens hardness and indentation elastic modulus were the key parameters determined from the load-indentation depth curves. Influence of the mechanical properties on the ratio of T and D was established. Indents were observed by using confocal laser microscope.
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Strength, elasticity, and fracture of composites with pyrolysed matrices based on methylsiloxane resins with optimized ratio of “T” and “D” components
 Černý, Martin ; Žaloudková, Margit ; Glogar, Petr ; Sucharda, Zbyněk ; Strachota, Adam ; Chlup, Zdeněk
The investigated composites reinforced with Nextel720 fibers reveal acceptable mechanical properties for applications exposed to temperature up to 1300 °C. Mechanical properties were studied after three-hour exposition at 1300, 1400 and 1500 °C without a protective atmosphere. This temperature treatment increases the mechanical strength up to 15 %.
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