Researches

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.

Necessary rock studies of the gabbro and andesite basalt groups for the suitability as the raw material base for the production of continuous basalt fiber (CBF). A unique technique including laboratory melting and pilot-industrial melting at the high-tech equipment.

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.

 

Companies: Kamenny Vek, Mechanical Properties

Countries: Czech

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