研究目的
To study the mechanical properties of a series of twenty glasses in the quartenary Na2O-Al2O3-B2O3-SiO2 system with fixed soda content, aiming to improve understanding of composition-structure-mechanical property relations in oxide glasses.
研究成果
The mechanical properties of sodium aluminoborosilicate glasses show significant compositional dependence, with elastic moduli and hardness predictable using semi-empirical models when network topology is considered. Fracture toughness exhibits larger deviations between experimental and predicted values, indicating a need for refined models that account for crack path and bond strength variations. The highest toughness is observed in a specific composition, but more data is required for comprehensive predictive modeling.
研究不足
The study is limited to a specific compositional range with fixed soda content; volatilization of Na2O and B2O3 during synthesis may cause deviations; fracture toughness measurements are time-consuming and only performed on six compositions; assumptions in structural models may not fully capture real behavior; indentation-based toughness measurements can be unreliable due to complex stress fields and composition-dependent deformation mechanisms.
1：Experimental Design and Method Selection:
The study involves synthesizing twenty different glass compositions using the traditional melt-quenching technique, followed by characterization using differential scanning calorimetry (DSC), Archimedes' principle for density, ultrasonic echography for elastic moduli, Vickers indentation for hardness, and the single-edge precracked beam (SEPB) method for fracture toughness. The compositional trends are compared against predicted values based on existing physical models.
2：Sample Selection and Data Sources:
Samples are prepared from SiO2, Al2O3, H3BO3, and Na2CO3 chemicals, with nominal compositions tabulated. One composition is taken from a previous study.
3：List of Experimental Equipment and Materials:
Equipment includes an electric furnace (Entech), Pt-Rh crucible, DSC 449C (Netzsch), analytical balance, ultrasonic thickness gauge (38DL Plus, Olympus), Vickers indentation apparatus (CB500, Nanovea), indentation apparatus (VMT-7S, Matsuzawa), piezoelectric displacement actuator (N-216 NEXLINE? Linear Actuator, Physik Instrumente), laser interferometer displacement sensor (LK-G5000 with LK-H008W head sensor, Keyence Corporation), and load cell (MS02, Scaime). Materials include SiO2 (SigmaAldrich, >99.5%), Al2O3 (SigmaAldrich, >99.5%), H3BO3 (Honeywell, >99.5%), Na2CO3 (Honeywell, >99.5%), ethanol, SiC paper, diamond suspension, Pt-Rh crucible, brass plate, WC fixture, SiC pusher, and SiC rollers.
4：5%), Al2O3 (SigmaAldrich, >5%), H3BO3 (Honeywell, >5%), Na2CO3 (Honeywell, >5%), ethanol, SiC paper, diamond suspension, Pt-Rh crucible, brass plate, WC fixture, SiC pusher, and SiC rollers. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Glasses are melted, homogenized, quenched, and annealed. DSC is performed to determine Tg. Density is measured by Archimedes' principle. Ultrasonic echography uses pulse-echo technique with 20 MHz transducers. Vickers indentation is done at 1 N load with optical imaging. SEPB involves indentation to induce precracks, bridge compression, and three-point bending to measure fracture toughness.
5：Data Analysis Methods:
Data analysis includes calculation of elastic moduli from sound velocities and density, hardness from indent diagonal lengths, and fracture toughness from load-deflection curves using work of fracture or maximum load methods. Statistical techniques involve averaging multiple measurements and error estimation.
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Ultrasonic thickness gauge
38DL Plus
Olympus
Used to determine longitudinal and transverse sound wave velocities through specimens.
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Piezoelectric displacement actuator
N-216 NEXLINE? Linear Actuator
Physik Instrumente
Used in the three-point bending setup for mechanical testing.
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DSC
449C
Netzsch
Used for differential scanning calorimetry experiments to determine glass transition temperature.
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Vickers indentation apparatus
CB500
Nanovea
Used for Vickers indentation cycles to determine hardness.
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Indentation apparatus
VMT-7S
Matsuzawa
Used for indentation to induce precracks in SEPB specimens.
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Laser interferometer displacement sensor
LK-G5000
Keyence Corporation
Used with head sensor LK-H008W for displacement measurement in three-point bending.
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Load cell
MS02
Scaime
Used to measure load in three-point bending experiments.
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Electric furnace
Entech
Used for melting and homogenizing glass batches.
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Pt-Rh crucible
Used for melting glass mixtures.
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Analytical balance
Used for weighing specimens in air and ethanol for density measurement.
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SiC paper
Used for grinding and polishing specimens.
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Diamond suspension
1 μm
Used for polishing specimens to an optical finish.
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WC fixture
Used for bridge compression to induce precracks in SEPB specimens.
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SiC pusher
Used to load the fixture during bridge compression.
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SiC rollers
Used as supports in the three-point bending setup.
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