Influence of hexagonal boron nitride nanosheets on phase transformation, microstructure evolution and mechanical properties of Si3N4 ceramics

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F21%3A00542944" target="_blank" >RIV/68081723:_____/21:00542944 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0955221921000972?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0955221921000972?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jeurceramsoc.2021.01.057" target="_blank" >10.1016/j.jeurceramsoc.2021.01.057</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of hexagonal boron nitride nanosheets on phase transformation, microstructure evolution and mechanical properties of Si3N4 ceramics

Popis výsledku v původním jazyce

Fully dense Si3N4 materials with 1 wt.% (- 1.5 vol.%) and 2 wt.% (- 3.0 vol.%) h-BN nanosheets were prepared by spark plasma sintering at 1750 degrees C with the dwell of 7 min under a pressure of 50 MPa in a vacuum. BN nanosheets with different dimensions were prepared by ultrasound-assisted liquid phase exfoliation of h-BN powder, followed by centrifugation at different speeds (1000 rpm and 3000 rpm). The addition of BN nanosheets hindered the particle rearrangement stage of sintering, which resulted in the delayed alpha>beta phase transformation of Si3N4. To study a direct effect of BN nanosheets on the mechanical properties of Si3N4, the results were compared to the monolithic Si3N4 with similar grain size and alpha/beta-Si3N4 ratio. The addition of 2 wt.% h-BN nanosheets (1000 rpm) increased both the fracture toughness (- 26 %) and the strength (- 45 %) of Si3N4, when compared to the monolithic Si3N4 with similar microstructure.

Název v anglickém jazyce

Influence of hexagonal boron nitride nanosheets on phase transformation, microstructure evolution and mechanical properties of Si3N4 ceramics

Popis výsledku anglicky

Fully dense Si3N4 materials with 1 wt.% (- 1.5 vol.%) and 2 wt.% (- 3.0 vol.%) h-BN nanosheets were prepared by spark plasma sintering at 1750 degrees C with the dwell of 7 min under a pressure of 50 MPa in a vacuum. BN nanosheets with different dimensions were prepared by ultrasound-assisted liquid phase exfoliation of h-BN powder, followed by centrifugation at different speeds (1000 rpm and 3000 rpm). The addition of BN nanosheets hindered the particle rearrangement stage of sintering, which resulted in the delayed alpha>beta phase transformation of Si3N4. To study a direct effect of BN nanosheets on the mechanical properties of Si3N4, the results were compared to the monolithic Si3N4 with similar grain size and alpha/beta-Si3N4 ratio. The addition of 2 wt.% h-BN nanosheets (1000 rpm) increased both the fracture toughness (- 26 %) and the strength (- 45 %) of Si3N4, when compared to the monolithic Si3N4 with similar microstructure.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Journal of the European Ceramic Society

ISSN

0955-2219

e-ISSN

1873-619X

Svazek periodika

41

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

5115-5126

Kód UT WoS článku

000651914800004

EID výsledku v databázi Scopus

2-s2.0-85102010027