Mechanické vlastnosti částečně pyrolyzovaných kompozitů s čedičovovou vláknovou výztuží v plátnové vazbě

Mechanical properties of partially pyrolysed composites with plain weave basalt fibre reinforcement

článek v časopise ve Web of Science, Jimp

en

The process of partial pyrolysis was used in the manufacture of composite materials with improved thermal resistance. As reinforcement, basalt plain weave fabric was employed. For the production of the investigated composites, two variants of the matrix precursor polymethylsiloxane or polymethylphenylsiloxane resins were used. In order to find favourable mechanical properties of the developed materials, several pyrolysis processes differing in the achieved maximum temperature were tested. Flexural strength, Youngs modulus, shear modulus, fracture toughness, the temperature dependence of Youngs modulus and of creep were measured. The microstructure of the composites was studied by light microscopy and by SEM. The composite with methyphenylsiloxane precursor exhibits favourable mechanical properties after final pyrolysis temperatures in the range of 650–750 C. In the case of the composite with polymethylsiloxane matrix precursor, the best mechanical properties were achieved by pyrolysis terminated at 650 C.

Při výrobě se zvýšenou tepelnou odolností byl použit proces částečné pyrolýzy. Jako výztuž byla použita čedičová tkanina. K výrobě byly použity dvě varianty matricového prekurzoru, polymethylsiloxanová a polymethylfenylsiloxanová pryskyřice. K nalezení nejuspokojivějších mechanických vlastností byla použita série pyrolýzních teplot. Byly měřeny veličiny: ohybová pevnost, modul pružnosti, smykový modul, lomová houževnatost, teplotní závislost modulu pružnosti a creepu. Mikrostruktura bylo studována pomocí světelné mikroskopie a SEM. Jako vhodný se jeví kompozit s methylpenylsiloxanovým prekurzorem po pyrolýze při 650 – 750 C. V případě kompozitu s methylsiloxanovým prekurzorem bylly nejlepší vlastnosti dosaženy při pyrolýze ukončené při 650 C.

The process of partial pyrolysis was used in the manufacture of composite materials with improved thermal resistance. As reinforcement, basalt plain weave fabric was employed. For the production of the investigated composites, two variants of the matrix precursor polymethylsiloxane or polymethylphenylsiloxane resins were used. In order to find favourable mechanical properties of the developed materials, several pyrolysis processes differing in the achieved maximum temperature were tested. Flexural strength, Youngs modulus, shear modulus, fracture toughness, the temperature dependence of Youngs modulus and of creep were measured. The microstructure of the composites was studied by light microscopy and by SEM. The composite with methyphenylsiloxane precursor exhibits favourable mechanical properties after final pyrolysis temperatures in the range of 650–750 C. In the case of the composite with polymethylsiloxane matrix precursor, the best mechanical properties were achieved by pyrolysis terminated at 650 C.

Mechanické vlastnosti; Kompozity s keramickou matricí (CMCs); Lomová houževnatost; Teplotní zátěž

Mechanical properties; Ceramic-matrix composites (CMCs); Fracture toughness; Heat treatment

2014

08.01.2014

Elsevier

0272-8842

40

5

7507–7521

15