Pressure assisted sintering of Al2O3-Y2O3 glass microspheres: sintering conditions, grain size, and mechanical properties of sintered ceramics

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F22%3APU143954" target="_blank" >RIV/00216305:26620/22:PU143954 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.degruyter.com/document/doi/10.1515/pac-2021-0705/html" target="_blank" >https://www.degruyter.com/document/doi/10.1515/pac-2021-0705/html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1515/pac-2021-0705" target="_blank" >10.1515/pac-2021-0705</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Pressure assisted sintering of Al2O3-Y2O3 glass microspheres: sintering conditions, grain size, and mechanical properties of sintered ceramics

Popis výsledku v původním jazyce

Glass microspheres with yttria-alumina eutectic composition (76.8 mol % Al2O3 and 23.2 mol % Y2O3) were prepared by sol-gel Pechini method and flame synthesis with or without subsequent milling. Prepared amorphous powders were studied by X-ray powder diffraction (XRD), particle size analysis (PSA), scanning electron microscopy (SEM) and differential thermal analysis (DTA). Hot pressing (HP), rapid hot pressing (RHP) and spark plasma sintering (SPS) were used to sinter amorphous precursor powders at 1600 degrees C without holding time (0 min). The preparation process including milling step resulted in amorphous powders with narrower particle size distribution and smaller particle size. All applied pressure assisted sintering techniques resulted in dense bulk samples with fine grained microstructure consisting of irregular alpha-Al2O3 and Y3Al5O12 (YAG) grains. Milling was beneficial in terms of final microstructure refinement and mechanical properties of sintered materials. A material with the Vickers hardness of HV = (17.1 +/- 0.3) GPa and indentation fracture resistance of (4.2 +/- 0.2) MPa.m(1/2) was prepared from the powder milled for 12 h.

Název v anglickém jazyce

Pressure assisted sintering of Al2O3-Y2O3 glass microspheres: sintering conditions, grain size, and mechanical properties of sintered ceramics

Popis výsledku anglicky

Glass microspheres with yttria-alumina eutectic composition (76.8 mol % Al2O3 and 23.2 mol % Y2O3) were prepared by sol-gel Pechini method and flame synthesis with or without subsequent milling. Prepared amorphous powders were studied by X-ray powder diffraction (XRD), particle size analysis (PSA), scanning electron microscopy (SEM) and differential thermal analysis (DTA). Hot pressing (HP), rapid hot pressing (RHP) and spark plasma sintering (SPS) were used to sinter amorphous precursor powders at 1600 degrees C without holding time (0 min). The preparation process including milling step resulted in amorphous powders with narrower particle size distribution and smaller particle size. All applied pressure assisted sintering techniques resulted in dense bulk samples with fine grained microstructure consisting of irregular alpha-Al2O3 and Y3Al5O12 (YAG) grains. Milling was beneficial in terms of final microstructure refinement and mechanical properties of sintered materials. A material with the Vickers hardness of HV = (17.1 +/- 0.3) GPa and indentation fracture resistance of (4.2 +/- 0.2) MPa.m(1/2) was prepared from the powder milled for 12 h.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

PURE AND APPLIED CHEMISTRY

ISSN

0033-4545

e-ISSN

1365-3075

Svazek periodika

94

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

157-167

Kód UT WoS článku

000739605800001

EID výsledku v databázi Scopus

2-s2.0-85120814279