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These two reasons are the "culprits" that cause cracking and porcelain detachment in glass reaction vessels
Date: 2024-01-07Read: 0
glass reactorIt is a multifunctional reactor that can perform various biochemical synthesis reactions and synthesis reactions under constant temperature conditions. The instrument is a fully enclosed system that can be evacuated to negative pressure as needed to meet experimental conditions. By adjusting the regulating valve on the constant pressure funnel or feeding bottle to control the uniform dripping of materials, negative pressure can also be used to continuously suck in various liquid materials. It can also be added or distilled at different temperatures, and the heat exchange function of the condenser can be used to distill and recover the reaction products. The equipment itself has a heating bath.
Its working principle:
glass reactorMainly utilizing its double-layer glass characteristics, the reaction material can be placed in the middle layer and stirred under normal pressure or negative pressure. In this way, the medium inside the interlayer of the glass reaction vessel (such as frozen liquid, heated water, or heated oil) is stirred to achieve a cyclic reaction for heating or cooling. Widely used as an ideal equipment in modern biochemical new material synthesis experiments.
What are the reasons for cracks and porcelain detachment in glass reaction vessels?
1. We need to understand that when cracks or porcelain detachment occur in the reaction vessel, it is related to a term called "coefficient of expansion". Because thermal expansion itself is a very important physical property of reaction vessel enamel. Because an increase in temperature can also cause thermal expansion of porcelain glaze or enamel layer, it is generally necessary to use the coefficient of thermal expansion to measure it. The coefficient of thermal expansion of a glass lined reaction vessel should be about three times the coefficient of linear expansion.
2. When the expansion coefficient of the enamel layer is greater than that of the metal, the shrinkage amplitude of the enamel layer will be greater than that of the metal after the equipment is fired and cooled. In this way, the enamel layer will also be subjected to tensile stress from the embryo. When the tensile stress is greater than the tensile strength of the enamel layer, cracks will appear in the enamel layer. Conversely, when the expansion coefficient of the enamel layer is smaller than that of the metal, the shrinkage of the enamel layer will be slower than that of the billet. Therefore, when the enamel layer is subjected to this compressive stress and is greater than the compressive strength of the enamel layer, porcelain detachment will occur. So in fact, the compressive strength of porcelain glaze is required to be 10-20 times greater than the tensile strength, that is, the porcelain layer needs to be in a compressed state to be relatively stable.