Glass, and preparation method and application thereof

Abstract

The invention relates to the technical field of glass production, and especially relates a glass, and a preparation method and application thereof. The glass provided by the invention comprises, by weight, 20-50% of CaO, 10-40% of MgO, 10-40% of SiO2, 1-30% of B2O3, 0-5% of ZrO2, 0-5% of Al2O3 and 0-5% of La2O3. According to the glass, the proportion of each component is adjusted, the ratio of a glass phase to a ceramic phase is adjusted, the thermal expansion coefficient of the glass is increased, the thermal expansion coefficient of the glass is measured to be 10.95-11.65 ppm / DEG C through experiments, and the thermal expansion coefficient is large, and is matched with the thermal expansion coefficient of a common material stainless steel of a connector of a solid oxide fuel cell, so therisk of battery leakage caused by mismatching of thermal expansion coefficients of the two can be reduced.

Description

technical field [0001] The invention relates to the technical field of glass production, in particular to a glass and its preparation method and application. Background technique [0002] During the use of the solid oxide fuel cell (SOFC), the operating temperature of the battery changes greatly, and the thermal expansion coefficient of the existing sealing glass is small, so the expansion coefficient between the sealing glass and the connecting body of the battery is prone to occur. Mismatch, thus prone to leakage. In SOFC, a glazed glass layer is generally placed between the sealing glass and the battery connector to protect the metal matrix of the connector, improve the oxidation resistance of the connector, and at the same time improve the performance of the sealing glass and the connector. However, since the glazed glass needs to be sintered on the connecting body first, and the sintering temperature is relatively high, it is necessary to form a macroscopically smooth ...

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Problems solved by technology

[0004] Although the formula mentioned in the existing patent can obtain sealing glass with high expansion coefficient, it still has the following disadvantages: (1) the type of crystallization cannot be controlled. Although many crystal phases with high expansion coefficient can be obtained, the The coefficient of expansion cannot be controlled within a very narrow range, and it is easy to cause a thermal expansion coefficient mismatch between the sealing glass, the connecting body and the glazed glass; (2) the ratio of the glass phase to the ceramic phase cannot be controlled through the glass formula, and the glass The phase has the effect of reducing porosity and increasing toughness, but the expansion coefficient is low. The ceramic phase has a high expansion coefficient, but the toughness is insufficient. If the ratio between the two cannot be controlled well, a certain performance will be missing

If the proportion of the glass phase is too high, on the one hand, the thermal expansion coefficient will become lower, which cannot meet the demand for high expansion coefficient, resulting in the mismatch of thermal expansion coefficients between the sealing glass, the connecting body and the glaze glass; on the other hand, the proportion of the glass phase is relatively low With the operation of the stack, there will be a transition from glass phase to ceramic phase. This transition will be accompanied by volume shrinkage. This shrinkage will cause internal defects, weaken the strength of the sealing glass, and easily cause leakage; ceramic phase and glass phase Compared with poor toughness and poor thermal shock resistance, the stack needs to operate under high temperature conditions, and it will generate relatively large thermal shock when operating at low temperature to high temperature. If the proportion of ceramic phase is too high, this stress cannot be released quickly , will cause a large internal compressive stress, resulting in internal collapse and leakage

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