Publication detail

Processing and properties of fine-grained transparent MgAl2O4 ceramics

MACA, K. TRUNEC, M. CHMELÍK, R.

Czech title

Příprava a vlastnosti jemnozrnne transparentni MgAl2O4 keramiky

English title

Processing and properties of fine-grained transparent MgAl2O4 ceramics

Type

journal article in Web of Science

Language

en

Original abstract

Transparent fine-grained MgAl2O4 ceramics was prepared from nanometre-sized powder without any sintering additives. Ceramic green bodies were prepared by cold isostatic pressing and then pressureless presintered at temperatures of 1550-1600degC to reach closed porosity. Presintered samples were subsequently hot isostatically pressed (HIPed) at 1500degC and 200 MPa for 1 hour. The final density as well as the transparency of HIPed samples was affected by presintering densities. The highest final density (~100% t.d.) and highest in-line transmission (60.2% for sample thickness 1.1mm and = 632.8 nm) were obtained for sample presintered to the lowest density value still guaranteeing the structure with closed porosity (~94% t.d.). The HIPed sample had an average grain size of 1 micron and hardness HV=13.0 GPa.

Czech abstract

Transparentní MgAl2O4 keramika byla připravena z nanometrového prášku bez použití slinovacích aditiv. Tělesa připravená izostatickým lisováním za studena byla slinována ve volné atmosféře při teplotách 1550 – 1600deg pro dosažení uzavřené pórovitosti. Předslinuté vzorky pak byly HIPovány při 1500deg a 200MPa po dobu 1 hodina. Konečná hustota i transparence vzorky byly ovlivněny hustotami po předslinutí. Nejvyšší kunečné hustoty (cca 100%t.h.) a nejvyšší přímočaré propustnosti (60,2% pro tloušťku vzorku 1,1mm a vlnovou délku 632,8nm) bylo dosaženo při nejnižší hustotě po předslinutí, která ještě zajištovala uzavřenou pórovitost vzorku (cca 94%t.h.). HIPovaný vzorek měl střední velikost zrn 1 mikrometr a tvrdost HV = 13,0GPa.

English abstract

Transparent fine-grained MgAl2O4 ceramics was prepared from nanometre-sized powder without any sintering additives. Ceramic green bodies were prepared by cold isostatic pressing and then pressureless presintered at temperatures of 1550-1600degC to reach closed porosity. Presintered samples were subsequently hot isostatically pressed (HIPed) at 1500degC and 200 MPa for 1 hour. The final density as well as the transparency of HIPed samples was affected by presintering densities. The highest final density (~100% t.d.) and highest in-line transmission (60.2% for sample thickness 1.1mm and = 632.8 nm) were obtained for sample presintered to the lowest density value still guaranteeing the structure with closed porosity (~94% t.d.). The HIPed sample had an average grain size of 1 micron and hardness HV=13.0 GPa.

Keywords in Czech

spinelová keramika, slinování, izostatické lisování za horka, mikrostruktura, optické vlastnosti

Keywords in English

spinel ceramics, sintering, hot-isostatic pressing, microstructure, optical properties

RIV year

2007

Released

01.01.2007

Publisher

Institute of Chemical Technology in Prague and Academy of Sciences of the Czech Republic

Location

Prague

ISSN

0862-5468

Journal

Ceramics-Silikáty

Volume

51

Number

2

Pages from–to

94–97

Pages count

4

BIBTEX


@article{BUT44028,
  author="Karel {Maca} and Martin {Trunec} and Radim {Chmelík},
  title="Processing and properties of fine-grained transparent MgAl2O4 ceramics",
  journal="Ceramics-Silikáty",
  year="2007",
  volume="51",
  number="2",
  month="January",
  pages="94--97",
  publisher="Institute of Chemical Technology in Prague and Academy of Sciences of the Czech Republic",
  address="Prague",
  issn="0862-5468"
}