Publication detail

Transparent magnesium aluminate spinel: Effect of critical temperature in two-stage spark plasma sintering

TALIMIAN, A. POUCHLÝ, V. EL-MAGHRABY, H. MACA, K. GALUSEK, D.

Original Title

Transparent magnesium aluminate spinel: Effect of critical temperature in two-stage spark plasma sintering

English Title

Transparent magnesium aluminate spinel: Effect of critical temperature in two-stage spark plasma sintering

Type

journal article in Web of Science

Language

en

Original Abstract

The discolouration of magnesium aluminate spinet caused by carbon contamination is a main drawback of fabricating transparent bodies by spark plasma sintering (SPS). In this study, a two-stage heating rate profile was used to produce transparent MgAl2O4 without using sintering aids by SPS at 1250 degrees C. The effect of critical temperature (Tc), at which the heating rate is decreased, on transparency and carbon contamination was investigated: higher critical temperature resulted in higher contamination. Non-uniform densification indicated that fast heating results in a hot-zone formation in the centre of sintered pellets; the higher temperature of centre favoured reaction of graphite die with spinel and formation of disordered carbon structures in residual pores.

English abstract

The discolouration of magnesium aluminate spinet caused by carbon contamination is a main drawback of fabricating transparent bodies by spark plasma sintering (SPS). In this study, a two-stage heating rate profile was used to produce transparent MgAl2O4 without using sintering aids by SPS at 1250 degrees C. The effect of critical temperature (Tc), at which the heating rate is decreased, on transparency and carbon contamination was investigated: higher critical temperature resulted in higher contamination. Non-uniform densification indicated that fast heating results in a hot-zone formation in the centre of sintered pellets; the higher temperature of centre favoured reaction of graphite die with spinel and formation of disordered carbon structures in residual pores.

Keywords

Magnesium aluminate spinel; Spark plasma sintering; Carbon contamination; Optical properties

Released

01.06.2020

Publisher

ELSEVIER SCI LTD

Location

OXFORD

ISBN

0955-2219

Periodical

Journal of the European Ceramic Society

Year of study

40

Number

6

State

GB

Pages from

2417

Pages to

2425

Pages count

9

URL

Full text in the Digital Library

Documents

BibTex


@article{BUT163795,
  author="Ali {Talimian} and Václav {Pouchlý} and H.F. {El-Maghraby} and Karel {Maca} and Dušan {Galusek}",
  title="Transparent magnesium aluminate spinel: Effect of critical temperature in two-stage spark plasma sintering",
  annote="The discolouration of magnesium aluminate spinet caused by carbon contamination is a main drawback of fabricating transparent bodies by spark plasma sintering (SPS). In this study, a two-stage heating rate profile was used to produce transparent MgAl2O4 without using sintering aids by SPS at 1250 degrees C. The effect of critical temperature (Tc), at which the heating rate is decreased, on transparency and carbon contamination was investigated: higher critical temperature resulted in higher contamination. Non-uniform densification indicated that fast heating results in a hot-zone formation in the centre of sintered pellets; the higher temperature of centre favoured reaction of graphite die with spinel and formation of disordered carbon structures in residual pores.",
  address="ELSEVIER SCI LTD",
  chapter="163795",
  doi="10.1016/j.jeurceramsoc.2020.02.012",
  howpublished="online",
  institution="ELSEVIER SCI LTD",
  number="6",
  volume="40",
  year="2020",
  month="june",
  pages="2417--2425",
  publisher="ELSEVIER SCI LTD",
  type="journal article in Web of Science"
}