Effect of the exposition temperature on the behaviour of partially pyrolysed hybrid basalt fibre composites

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F18%3A00491298" target="_blank" >RIV/68081723:_____/18:00491298 - isvavai.cz</a>

Alternative codes found

RIV/61389013:_____/18:00491298 RIV/67985891:_____/18:00491298

Result on the web

<a href="http://dx.doi.org/10.1016/j.compositesb.2018.04.021" target="_blank" >http://dx.doi.org/10.1016/j.compositesb.2018.04.021</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.compositesb.2018.04.021" target="_blank" >10.1016/j.compositesb.2018.04.021</a>

Result language

angličtina

Original language name

Effect of the exposition temperature on the behaviour of partially pyrolysed hybrid basalt fibre composites

Original language description

Composites utilising long fibres as reinforcement are the most effective from the point of view of the toughening effect. A brittle matrix reinforced by brittle fibres was investigated in this work. Polysiloxane resin was used as matrix precursor in the studied composite, while continuous basalt fibres served as reinforcement. An optimised pyrolysis process conducted at 650 degrees C under nitrogen atmosphere turned the polymeric precursor into the so-called hybrid matrix consisting of nano-domains of pyrolytic SiOC glass and of non-transformed polysiloxane polymer. The pyrolysis temperature of 650 degrees C was found to be optimal, resulting in the fracture toughness attacking the level of 20 MPa m(1/2) and the strength reaching the value of 1 GPa. The main aim of this paper is to investigate microstructural changes occurring during long-term (1000 h = 41.7 days) exposition to an oxidative air atmosphere at temperatures from 250 degrees C to 600 degrees C and to describe the effect on the mechanical properties of the studied hybrid-matrix composite. The increasing exposition temperature leads to a significant embrittlement of the composite, while the elastic properties (modulus) remain unchanged. Chemical or microstructural changes in the basalt fibres were not detected after the long-term exposition to the tested high temperatures. Nevertheless, fibre embrittlement can be estimated from the tests. Both matrix and fibre-matrix interface were found to suffer from the applied exposition. Distinct changes in chemical composition as well as in microstructure were observed for the matrix. Hence, the observed embrittlement of the composite can be ascribed partly to the changes in the hybrid matrix and the fibre-matrix interface, and partially to fibre embrittlement.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20504 - Ceramics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Composites Part B-Engineering

ISSN

1359-8368

e-ISSN

—

Volume of the periodical

147

Issue of the periodical within the volume

AUG

Country of publishing house

GB - UNITED KINGDOM

Number of pages

6

Pages from-to

122-127

UT code for WoS article

000437064900013

EID of the result in the Scopus database

2-s2.0-85045701730