Publication detail

Osmotic drying of gelcast bodies in liquid desiccant

TRUNEC, M.

Czech title

Osmotické sušení těles připravených metodou gelového lití v kapalném desikantu

English title

Osmotic drying of gelcast bodies in liquid desiccant

Type

journal article in Web of Science

Language

en

Original abstract

Osmotic drying of gelcast alumina bodies was carried out in water solutions of various polyethylene glycols (PEGs) with molecular weight ranging from 1000 to 80000 g/mol. Up to 30 % of the water content could be removed from the gelcast bodies immersed in a 43 wt% solution of PEG 80000. It was found that PEG 1000 was a less effective desiccant than the PEGs with higher molecular weights, even if the osmotic pressure was similar (4.9 MPa). The smaller PEG molecules penetrated the gelled bodies and reduced the dewatering. Moreover, the penetrated PEG molecules affected the pore structure of green bodies and in this way influenced the sintering behaviour. The time dependence of dewatering and the effect of the size of gelcast bodies were investigated and correlated with the green body structure and sintering behaviour in order to optimize the osmotic drying process.

Czech abstract

Osmotické sušení těles připravených metodou gelového lití z oxidu hlinitého bylo prováděno ve vodném roztoku různých polyetylenglykolů (PEG) s molekulovou hmotností od 1000 do 80 000 g/mol. Až 30% obsahu vody mohlo být odstraněné z těles ponořených do roztoku s koncentrací 43 hm% PEG 80 000. Bylo zjištěno, že PEG 1000 byl méně účinným desikantem než polyetylenglykoly s vyšší molekulovou hmotností, přestože osmotický tlak byl podobný (4,9 MPa). Menší molekuly polyetylenglykolu penetrovaly do zgelovaného tělesa a snižovaly odvodnění. Navíc penetrované molekuly polyetylenglykolu ovlivnily strukturu pórů polotovaru, a tím ovlivnily slinovací chování. Byla zkoumána časová závislost sušení a vliv velikosti těles a tyto údaje byly korelovány se strukturou polotovaru a slinovacím chováním za účelem optimalizace procesu sušení osmotického sušení.

English abstract

Osmotic drying of gelcast alumina bodies was carried out in water solutions of various polyethylene glycols (PEGs) with molecular weight ranging from 1000 to 80000 g/mol. Up to 30 % of the water content could be removed from the gelcast bodies immersed in a 43 wt% solution of PEG 80000. It was found that PEG 1000 was a less effective desiccant than the PEGs with higher molecular weights, even if the osmotic pressure was similar (4.9 MPa). The smaller PEG molecules penetrated the gelled bodies and reduced the dewatering. Moreover, the penetrated PEG molecules affected the pore structure of green bodies and in this way influenced the sintering behaviour. The time dependence of dewatering and the effect of the size of gelcast bodies were investigated and correlated with the green body structure and sintering behaviour in order to optimize the osmotic drying process.

Keywords in Czech

Al2O3; PEG; gelové lití; sušení; osmotický tlak

Keywords in English

Al2O3; PEG; Gelcasting; Drying; Osmotic

RIV year

2011

Released

01.11.2011

Publisher

Elsevier Science

Location

THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND

ISSN

0955-2219

Volume

31

Number

14

Pages from–to

2519–2524

Pages count

6

BIBTEX


@article{BUT88508,
  author="Martin {Trunec},
  title="Osmotic drying of gelcast bodies in liquid desiccant",
  year="2011",
  volume="31",
  number="14",
  month="November",
  pages="2519--2524",
  publisher="Elsevier Science",
  address="THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND",
  issn="0955-2219"
}