Effect of two-step sintering method on properties of zirconia ceramic / 华西口腔医学杂志
West China Journal of Stomatology
;
(6): 175-178, 2008.
Article
Dans Chinois
| WPRIM
| ID: wpr-296684
ABSTRACT
<p><b>OBJECTIVE</b>To study the influence of two-step sintering method on the sintering property, mechanical properties and microstructure of zirconia ceramic.</p><p><b>RESULTS</b>The nano-size zirconia powder were compacted and divided into two groups, one group for one-step sintering method, another group for two-step sintering method. All samples sintered at different temperature. The relative density, three-bend strength, HV hardness, fracture toughness and microstructure of sintered block were investigated.</p><p><b>RESULTS</b>Two-step sintering method influenced the sintering property and mechanical properties of zirconia ceramic. The maximal relative density was 98.49% at 900 degrees C/1,450 degrees C sintering temperature. There were significant difference of mechanical properties between one-step sintering and two-step sintering, the three-bend strength and fracture toughness declined, hardness increased at two-step sintering. The three-bend strength, HV hardness and fracture toughness reached to maximum value as 1,059.08 MPa +/- 75.24 MPa, 1,377.00 MPa +/- 16.37 MPa and 5.92 MPa x m1/2 +/- 0.37 MPa x m1/2 at 900 degrees C/1,450 degrees C sintering temperature respectively. Microscopy revealed the relationship between the porosity and shapes of grains was correlated to strength of the zirconia ceramics.</p><p><b>CONCLUSION</b>Despite of the two-step sintering method influences the properties of zirconia, it also is a promising esthetic all-ceramic dental material.</p>
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Température
/
Zirconium
/
Test de matériaux
/
Céramiques
/
Porosité
/
Matériaux dentaires
/
Porcelaine dentaire
/
Dureté
langue:
Chinois
Texte intégral:
West China Journal of Stomatology
Année:
2008
Type:
Article
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