Effects of nucleation agent particle size on properties, crystallisation and microstructure of glass-ceramics in TiO2-ZrO2-Li 2O-CaO- Al2O3-SiO2 system

Nemati, A ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1179/174367609X422063
  3. Publisher: 2010
  4. Abstract:
  5. The objective of this study was to evaluate the effects of P 2O5 particle size distribution on the crystalline phases and microstructure of lithium disilicate glass-ceramics derived from the TiO2-ZrO2-Li2O-CaO-Al2O 3-SiO2 system for dentistry applications. The samples were made via fusion and casting procedure. Crystallisation as well as the morphology and microstructure of the samples were investigated using X-ray diffraction, differential scanning calorimetric and scanning electron microscopy. The results showed that the crystallisation of the samples occurred in the range of 500-650°C. The main crystalline phase was lithium disilicate (Li2Si2O5) along with Lithium metasilicate (Li2SiO3), spodumene [LiAl(SiO3)2], lithium orthophosphate (Li3PO4) and cristobalite as secondary phases. With decreasing size of P2O5 particles, the morphology of Li2Si2O5 crystals was transformed from needle shaped to spherical-like and the mechanical property was improved. The optimal flexural strength of 280?MPa and microhardness of 620?HV were obtained at the lithium disilicate glass-ceramics with P2O 5 nanoparticles
  6. Keywords:
  7. Glass-ceramic ; Casting procedure ; Cristobalites ; Crystalline phase ; Crystalline phasis ; Crystallisation ; Dental ceramics ; Flexural strength ; Lithium disilicate ; Lithium disilicate glass ; Lithium metasilicate ; Nucleation agents ; Secondary phasis ; TiO ; Crystalline materials ; Crystallization ; Dental materials ; Glass ceramics ; Mechanical properties ; Microstructure ; Morphology ; Particle size analysis ; Scanning electron microscopy ; Secondary batteries ; Silicate minerals ; Silicon compounds ; X ray diffraction ; X ray diffraction analysis ; Zirconium alloys ; Lithium
  8. Source: Advances in Applied Ceramics ; Volume 109, Issue 6 , 2010 , Pages 318-323 ; 17436753 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1179/174367609X422063