Method for measuring firing temperature range of electrotechnical porcelain green body by using high-temperature dilatometer
A high-temperature expansion and firing temperature technology, applied in the direction of material thermal expansion coefficient, investigation stage/state change, etc., can solve the problems of high professional level requirements for operators, low labor efficiency, cumbersome methods, etc., and achieve less human influence factors, Ease of analysis, short-term effects
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Embodiment 1
[0036] Select a 220kV voltage level dry-molded electric porcelain green body, and its green body formula ratio is:
[0037] raw material name
Calcined kaolin
clay
Proportion
48%
20%
10%
22%
[0038] The basic physical indicators of the green body are as follows:
[0039] Body moisture
porosity content
0.55%
28.0%
[0040] The green body is ready to be fired, and the highest firing temperature in the firing process needs to be tested and provided to facilitate production. To this end, take a sample on the green body, make a sample with a length of φ6×25mm, test it in a high-temperature dilatometer and obtain the linear expansion rate curve 1 at each temperature point, and perform a differential on the curve 1, get figure 1 The first differential curve 2 is shown; the coefficient of thermal expansion curve 3 is jointly calculated from the linear expansion rate curve 1 ...
Embodiment 2
[0058] Select a 110kV voltage level wet-process bushing electric porcelain body, and its body formula ratio is:
[0059] raw material name
illite clay
plastic clay
Proportion
40%
10%
12%
38%
[0060] The basic physical indicators of the green body are as follows:
[0061] Body moisture
porosity content
2.4%
25.5%
[0062] The green body is ready to be fired, and the highest firing temperature in the firing process needs to be tested and provided to facilitate production. To this end, take a sample on the green body, make a sample with a length of φ6×25mm, test it in a high-temperature dilatometer and obtain the linear expansion rate curve 4 at each temperature point, and perform a differential on the curve 4, get figure 2 The primary differential curve 5 is shown; the linear expansion coefficient curve 6 is jointly calculated from the linear expansion rate curve 4 t...
Embodiment 3
[0066] Select a wet-process rod-shaped electric porcelain body with a voltage level of 110kV, and the formula ratio of the body is:
[0067] raw material name
illite clay
plastic clay
Proportion
45%
12%
10%
35%
[0068] The basic physical indicators of the green body are as follows:
[0069] Body moisture
porosity content
2.5%
23.7%
[0070] The green body is ready to be fired, and the highest firing temperature in the firing process needs to be tested and provided to facilitate production. To this end, take a sample on the green body, make a sample with a length of φ6×25mm, test it in a high-temperature dilatometer and obtain the linear expansion rate curve 7 at each temperature point, and perform a differential on the curve 7 once, get figure 2 The primary differential curve 8 is shown; the linear expansion coefficient curve 9 is jointly calculated from the linear...
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