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Mechanical behavior of polysiloxane matrix — based composite reinforced with basalt fibres at elevated temperatures

The study focused to mechanical properties of unidirectionally reinforced basalt fibre composites with a matrix derived by partial pyrolysis at 650 750 °C from commercially available polysiloxane precursors.

Mechanical properties of the basalt fibres Basaltex and Kamenny Vek were studied.

The creep which occurs above 600 °C is a limiting factor for their utilization at elevated temperatures. Above 750 °C their mechanical properties deteriorate due to commencing crystallization which also hampers their suitability as reinforcement in composites designated for elevated temperatures.

The composite pyrolysed at 650 °C revealed the best room — temperature properties. Its exploitation in a common environment up to 550 °C is possible but some reduction of strength and fracture toughness must be taken in consideration which takes place already after its short-time exposition in hot air.

Martin Černý, Zbyněk Sucharda, Petr Glogar;
Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, Prague.

 

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