Sintering of nanocrystalline ZrO2(3Y) by hot-pressing

Authors
Citation
W. Li et L. Gao, Sintering of nanocrystalline ZrO2(3Y) by hot-pressing, MATER TRANS, 42(8), 2001, pp. 1653-1656
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
MATERIALS TRANSACTIONS
ISSN journal
1345-9678 → ACNP
Volume
42
Issue
8
Year of publication
2001
Pages
1653 - 1656
Database
ISI
SICI code
1345-9678(200108)42:8<1653:SONZBH>2.0.ZU;2-N
Abstract
Processing of synthesising nanocrystalline ZrO2(3Y) by hut-pressing was inv estigated. Large crack-like pores have been found in the sintered samples. The reason of this phenomenon was that the agglomerate in the powder bad no t been destroyed efficiently. This agglomerate sintered quickly and turned into aggregate when hot-pressing was applied. Large pores formed as a resul t of the interaction between the aggregate and the matrix. Since the applie d pressure was limited because of the low stress tolerance of the graphite die, no plastic deformation could happen and those large pores could not be "squashed". As a result, the densities of the samples sintered by hot-pres sing were lower than by pressureless sintering at the similar sintering tem perature. To overcome this shortage of hot-pressing, sinter forging was app lied. Nano Y-TZP materials with.-rain size of about 85 nm and relative dens ity of 99% could be obtained after sinter-forging at 1100 degreesC for only 30 min.