Publication detail
Stress relaxation in partially pyrolyzed SiOC materials
HALASOVÁ, M. CHLUP, Z. ČERNÝ, M. STRACHOTA, A. DLOUHÝ, I.
Czech title
Relaxace napětí v částečně pyrolyzovaných SiOC materiálech
English title
Stress relaxation in partially pyrolyzed SiOC materials
Type
conference paper
Language
en
Original abstract
This paper is focused on the difficulty with Vickers hardness evaluation of SiOC materials. To evaluate Vickers hardness properly, right measurements of diagonals of an indent are crucial. Due to stress-strain relaxation in experimental material it was challenging to evaluate it in the whole range of processing temperatures. Two preceramic precursors of commercialy available polysiloxane resins were pyrolysed in the temperature range from 400 to 1000C. It was found that within a certain range of pyrolysis temperature the material is almost fully elastic. Above this range the indents are clearly visible and indicate the level of polymer-ceramic conversion.
Czech abstract
Tento článek je zaměřen na obtížnost vyhodnocení Vickersovy tvrdosti u SiOC materiálů. Ke správnému vyhodnocení Vickersovy tvrdosti jsou zásadní rozměry úhlopříček vtisků. Z důvodu relaxace napětí v experimentálních materiálech bylo vyhodnocení tvrdosti v celém teplotním rozsahu náročné. Dva prekeramické prekurzory komerčně dostupných polysiloxanových pryskyřic byly pyrolyzovány v rozsahu teplot od 400 do 1000C. Bylo zjištěno, že v určitém rozsahu pyrolýzních teplot je materiál téměř plně elastický. Nad tímto intervalem jsou vtisky jasně viditelné a indikují míru konverze polymeru na keramický střep.
English abstract
This paper is focused on the difficulty with Vickers hardness evaluation of SiOC materials. To evaluate Vickers hardness properly, right measurements of diagonals of an indent are crucial. Due to stress-strain relaxation in experimental material it was challenging to evaluate it in the whole range of processing temperatures. Two preceramic precursors of commercialy available polysiloxane resins were pyrolysed in the temperature range from 400 to 1000C. It was found that within a certain range of pyrolysis temperature the material is almost fully elastic. Above this range the indents are clearly visible and indicate the level of polymer-ceramic conversion.
Keywords in Czech
polysiloxan; pryskyřice; SiOC; sklo; keramika; Vickersova tvrdost; 3D rekonstrukce; vtisk; relaxace
Keywords in English
polysiloxane; resin; SiOC; glass; ceramics; Vickers hardness; 3D reconstruction; indent; relaxation
RIV year
2015
Released
28.05.2015
Location
Brno
ISBN
978-80-214-5146-9
Book
MULTI-SCALE DESIGN OF ADVANCED MATERIALS
Pages from–to
100–105
Pages count
154
BIBTEX
@inproceedings{BUT115857,
author="Martina {Halasová} and Zdeněk {Chlup} and Martin {Černý} and Adam {Strachota} and Ivo {Dlouhý},
title="Stress relaxation in partially pyrolyzed SiOC materials",
booktitle="MULTI-SCALE DESIGN
OF ADVANCED MATERIALS
",
year="2015",
month="May",
pages="100--105",
address="Brno",
isbn="978-80-214-5146-9"
}