研究目的
To investigate volume crystallization of quartz triggered by P2O5 addition in the multicomponent glass system, and to study the effects on microstructure and mechanical properties.
研究成果
Glass-ceramics with low-quartz as the main crystal phase were successfully produced, with volume crystallization controlled by P2O5 content. The interlocking microstructure of lath-like Li2Si2O5 and globular quartz crystals results in good mechanical properties (biaxial strength up to 331 MPa, fracture toughness up to 2.1 MPa·m^0.5) and machinability, enabling applications in prosthodontics. Future studies should focus on detailed nucleation mechanisms and surface crystallization.
研究不足
Surface crystallization effects were minor but present in some samples; internal nucleation mechanism and surface crystallization require further study. The inversion temperature and degree of substitution in quartz crystals are not fully known.
1:Experimental Design and Method Selection:
Controlled crystallization from parent glass to produce glass-ceramics with quartz and lithium disilicate phases. Methods include differential scanning calorimetry (DSC), X-ray diffraction (XRD), Rietveld refinement, scanning electron microscopy (SEM), mechanical testing, and thermal expansion analysis.
2:Sample Selection and Data Sources:
Four base glasses (A, B, C, D) with varying P2O5 content (
3:5 to 5 mol%) were prepared from raw materials like quartz, lithium carbonate, etc. Samples were melted, quenched, cast into blocks, and heat-treated. List of Experimental Equipment and Materials:
PtRh10 crucible, electric furnace, Netzsch STA 449 F3 DSC apparatus, muffle furnace, Programat? oven, D8 Advance XRD diffractometer, Mortar Grinder RM 200, CEREC? InLab milling machine, Zwick 1456 universal testing apparatus, Supra 40VP SEM. Materials include industrial quality raw materials and internal standards like Al2O
4:Experimental Procedures and Operational Workflow:
Melting at 1650°C for 2 hours, quenching in water, DSC analysis with heating rate 10 K/min, nucleation heat-treatment at 490-510°C for 30 min, crystallization heat-treatment at 600-750°C for 60 min, XRD analysis, mechanical testing (biaxial fracture strength and fracture toughness), thermal expansion measurement, SEM sample preparation with etching and coating.
5:Data Analysis Methods:
Rietveld refinement for crystal phase quantification using TOPAS software, statistical analysis of mechanical properties (mean ± standard deviation), and error estimation for thermal expansion.
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D8 Advance
D8 Advance
Bruker
X-ray diffraction (XRD) analysis for crystal phase identification.
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Supra 40VP
Supra 40VP
Carl Zeiss
Scanning electron microscopy (SEM) for microstructure investigation of glass-ceramics.
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PtRh10 crucible
PtRh10
Used for melting glass samples at high temperatures.
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Netzsch STA 449 F3
STA 449 F3
Netzsch
Differential scanning calorimetry (DSC) for thermal analysis of glass samples.
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Programat oven
Programat
Ivoclar Vivadent AG
Used for heat-treatment of glass blocks during crystallization.
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Mortar Grinder RM 200
RM 200
Retsch
Used to crush and comminute glass-ceramic blocks into powder for XRD analysis.
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CEREC InLab milling machine
CEREC InLab
Sirona
Wet milling to machine glass-ceramic blocks into small circular plates for mechanical testing.
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Zwick 1456
1456
Zwick GmbH & Co. KG
Universal testing apparatus for mechanical testing of biaxial fracture strength and fracture toughness.
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