Evalution of Microstrucutre of Mullite-ZrO2 Ceramics with Si3N4 Additive by use of Varied Sintering Methods
Cermodel 2017 Modelling and Simulation Meet Innovation in Ceramics Technology 2017
Gaida Maruta Sedmale, Līga Orlova, Ilmārs Zālīte, Gundars Mežinskis

The process of densification and microstructure evalution of starting mullite-ZrO2/Y2O3 powders with gradual additive of α-β Si3N4 nanopowder 1 to 5 wt.% by spark plasma and microwaves sintering (compared with traditional) were investigated by DTA, FESEM, XRD and by the characteristic ceramic (density and shrinkage) and mechanical properties (pressure strength and modulus of elasticity). It is shown that the main process of densification on DTA curves for investigated samples are characterized by a pronounced endo-effect, when gradual mullite formation and remarkable densification till the temperature up to 1200-1400°C starts. It is characterized by shrinkage and density both for traditionally and SPS as well for microwave sintered samples. The influence of Si3N4 additive for density characteristic is insignificant for all sintering cases. For SPS and microwave samples density reaches value 3.33-3.35 g/cm3 whereas for traditionally – 2.55 g/cm3, compressive strength for SPS –grows with Si3N4 additive and reaches 600 N/mm2, but for microwave sinterd samples this value have tendency to decrease to 450-500 MPa with growing of Si3N4 additive. Comparatively - for traditionally this value lowers to up to 200N/mm2.


Atslēgas vārdi
SPS, microwave sintering, mechanical properties, mullite, microstructure, ZrO2, Y2O3, Si3N4

Sedmale, G., Grase, L., Zālīte, I., Mežinskis, G. Evalution of Microstrucutre of Mullite-ZrO2 Ceramics with Si3N4 Additive by use of Varied Sintering Methods. No: Cermodel 2017 Modelling and Simulation Meet Innovation in Ceramics Technology, Itālija, Trento, 26.-28. jūlijs, 2017. Trento: University of Trento, 2017, 53.-53.lpp.

Publikācijas valoda
English (en)
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