PREPARATION OF NEPHELINE GLASS-CERAMICS AND THEIR APPLICATION AS DENTAL PORCELAIN

Authors
Citation
Mc. Wang et al., PREPARATION OF NEPHELINE GLASS-CERAMICS AND THEIR APPLICATION AS DENTAL PORCELAIN, Materials chemistry and physics, 37(4), 1994, pp. 370-375
Citations number
13
Categorie Soggetti
Material Science
ISSN journal
02540584
Volume
37
Issue
4
Year of publication
1994
Pages
370 - 375
Database
ISI
SICI code
0254-0584(1994)37:4<370:PONGAT>2.0.ZU;2-L
Abstract
The batch of starting glass was prepared from analytical-grade reagent s. Crystallization of the nepheline glass system was investigated usin g differential thermal analysis, X-ray diffraction, transmission and s canning electron microscopy. The major crystalline phase was found to be nepheline, Na2O.Al2O3.2SiO2. The Vickers microhardness of these mat erials is 640-660 MPa, and the thermal expansion coefficients are 12.1 -16.6 x 10(-6) K-1 from 298 to 773 K. The nepheline glass-ceramic powd ers were coated on a Ni-Cr alloy pattern. It was found that the failur es of the composites usually occurred at the interface between the all oy and opaque layer.