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Factors Affecting Thermal Stability of Enamel

Factors Affecting Thermal Stability of Enamel

  • Categories:Company news
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  • Time of issue:2023-05-17
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(Summary description)The thermal stability of enamel is the performance of the porcelain layer to withstand sudden temperature changes without damage.

Factors Affecting Thermal Stability of Enamel

(Summary description)The thermal stability of enamel is the performance of the porcelain layer to withstand sudden temperature changes without damage.

  • Categories:Company news
  • Author:
  • Origin:
  • Time of issue:2023-05-17
  • Views:0
Information

The thermal stability of enamel is the performance of the porcelain layer to withstand sudden temperature changes without damage. It is a comprehensive performance of properties including elasticity, thermal conductivity, specific heat, thermal expansion and tensile strength. The thermal stability of enamel has a certain relationship with the shape of the enamel product, but it mainly depends on the internal structure of the enamel and the porcelain layer, the number and type of crystals in the porcelain layer, etc.

 

The enamel with small thermal expansion coefficient, good thermal conductivity, good elasticity and high tensile strength has good thermal stability.

 

The thermal stability of the porcelain layer also has a great relationship with the thickness of the porcelain layer, as the thickness of the porcelain layer decreases, the thermal stability also increases.

 

There is no formula to measure the thermal stability of the porcelain layer, only the formula of glass can be used, and the thermal stability of glass can be expressed by the following relationship:

 

K=P/Eα(γ/cd)1/2

 

In the formula, K——the thermal stability of the glass

 

P - compressive strength of glass

 

E——Elastic abrasion of glass

 

α——Linear expansion coefficient of glass

 

γ——Thermal conductivity of glass

 

C - Specific heat of glass

 

D - the density of the glass

 

The smaller the K value of thermal stability, the worse the thermal stability, and vice versa.

 

It can be seen from the above formula that, generally speaking, the change of the two values of E and P is corresponding, so the change of P/E value is corresponding, so the change of P/E value is small. In addition, the value of (γ/cd)1/2 is also small, so the relationship between K and α is the largest, and α has decisive significance for K. In general, the thermal stability of glass is mainly determined according to the thermal expansion coefficient of the glass, that is, K∞1/α. For the porcelain layer, the K value is also related to the thickness of the porcelain layer. Generally speaking, K ∞1/S (S is the thickness of the porcelain layer).

 

In addition, it is also related to the temperature difference between the hot and cold rapid changes of the porcelain layer, that is, the greater the temperature difference between the cold and hot rapid changes of the enamel products, the worse the thermal stability. The thermal stability of the porcelain layer is also related to the mechanical strength (not including the thickness) of the green body. High mechanical strength means good thermal stability, and vice versa.

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