basic concept
Glass-ceramic: A glass of a specific combination with a nucleating agent is subjected to crystallization heat treatment under controlled conditions (certain temperature) to become a composite material having a uniform distribution of microcrystals and a glass phase.
structure
The microcrystals consist of a glass phase and a crystalline phase. The distribution of the two varies with the proportion. 1. When the proportion of the glass phase is large, the glass phase is a continuous matrix. The crystal phase is evenly distributed in it. 2. When the glass phase is small, the glass phase is dispersed between the crystal lattices and has a continuous network. 3. If the amount of the glass phase is very low, the glass phase is distributed between the crystals in a thin film state.
performance
High mechanical strength, excellent insulation performance, low dielectric loss, stable dielectric constant, thermal expansion coefficient can be adjusted in a wide range, chemical corrosion resistance, wear resistance, good thermal stability, high degree of use of warm microcrystalline glass.
application
(1) β-spodumene glass-ceramics and carbon fiber composites: strong toughening effect, new materials in aerospace.
(2) Oxygen-nitrogen glass-ceramics: Direct microcrystallization can be performed without radiation or addition of crystal nuclei, which lowers the sintering temperature of the silicon nitride crystal and maintains a high-strength β-silicon nitride structure.
(3) Cleaved mica glass-ceramics: layered structure, good electrical insulation and heat resistance (electronic insulating materials)
Production Process
1) Forming crystal nuclei in the glass by adding crystal nucleation or ultraviolet irradiation
2) After the heat treatment, the crystal nucleus grows up, and other production processes are the same as ordinary glass.
Heat treatment process: melting and forming, pre-crystallization processing, crystallization heat treatment, processing of glass-ceramics is widely used in the stove of induction cooker, concave glass-ceramic refers to the shape of the concave, similar to the current state of the microcrystal glass. The main use of the glass-ceramic plate is currently mainly used in high-power commercial induction cookers and household induction cookers. With the rise in gas prices, the cost of the catering industry, and the perception of cooking without open flames, the number of household cookers has increased. Sales of concave glass-ceramics have also increased accordingly
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