研究目的
To develop a technique for investigating the fine-grain inhomogeneity encountered in quartz glass and gain insight into mechanisms of defect formation in the glass structure.
研究成果
The research developed a technique to study fine-grain inhomogeneity in quartz glass, revealing that it arises from the formation of a three-dimensional intergranular network with high impurity concentration, rather than incomplete melting of quartz grains. Prolonged high-temperature treatment intensifies this effect, impacting the glass's physicochemical properties. Future studies could explore ways to minimize impurity incorporation.
研究不足
The relatively low impurity concentrations and technical details of instrumental analysis limit the possibility of detecting all impurities. The study focuses on specific conditions and may not generalize to all quartz glass preparation methods.
1：Experimental Design and Method Selection:
The study involved modifying the conventional quartz glass vacuum melting procedure to create conditions for impurity deposition on quartz grain surfaces, enabling higher contrast imaging of granular structures. Techniques included optical microscopy and scanning electron microscopy for structural and compositional analysis.
2：Sample Selection and Data Sources:
Quartz grit from natural raw materials and quartz glass samples prepared from this grit were used. The grit was highly enriched and purified under laboratory conditions.
3：List of Experimental Equipment and Materials:
Equipment included an electric vacuum furnace with resistive heater (tungsten rods), multilayer molybdenum foil heat shield, molybdenum support for the quartz crucible, Axiolab optical microscope, and Tescan VEGA3 SBU scanning electron microscope. Materials included natural quartz grit and refractory metals (tungsten, molybdenum).
4：Experimental Procedures and Operational Workflow:
The quartz grit underwent premelting treatment at increased temperatures (1350°C for 60 min) and cristobalitization at 1650°C. Melting was performed at 1850°C for 120 min in an unlidded crucible to allow contact with the vacuum chamber atmosphere. Samples were analyzed using microscopy to observe grain boundaries and impurity composition.
5：Data Analysis Methods:
Elemental composition of intergranular phases was determined using scanning electron microscopy, with analysis of impurity concentrations and identification of compounds like molybdenum disilicide and tungsten silicide.
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