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

Active Publication Date: 2011-02-16
CHINA XD ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The current method of testing the firing temperature range of green bodies has a long period and is cumbersome, a...

Method used

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  • Method for measuring firing temperature range of electrotechnical porcelain green body by using high-temperature dilatometer
  • Method for measuring firing temperature range of electrotechnical porcelain green body by using high-temperature dilatometer
  • Method for measuring firing temperature range of electrotechnical porcelain green body by using high-temperature dilatometer

Examples

Experimental program
Comparison scheme
Effect test

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

Bauxite

Feldspar

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

Bauxite

Feldspar

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

Bauxite

Feldspar

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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Abstract

The invention provides a method for measuring the firing temperature range of an electrotechnical porcelain green body by using a high-temperature dilatometer, which comprises the following steps of: performing differentiation on a linear expansion ratio curve of the electrotechnical porcelain green body to obtain a first-order differential curve of the linear expansion ratio curve; and calculating a thermal expansion coefficient curve by the linear expansion ratio curve through a formula 1 and a formula 2 jointly, wherein in the formula 1, alpha= dL/L0*[1/(th-t0)]+alpha0, and in the formula 2, A=dl/L0*100+alpha0(th-t0)*100; the maximum temperature in corresponding coordinates within a last decreasing region of the first-order differential curve is a minimum firing temperature point of the electrotechnical porcelain green body; and the maximum temperature in corresponding coordinates within a last decreasing region of the thermal expansion coefficient curve is a maximum firing temperature point of the electrotechnical porcelain green body. In the method, a thermal expansion test of the green body is completed at a high temperature by modern scientific research instruments with advanced testing means, so the time period is short, the accuracy is high, the analysis is convenient, and artificial influencing factors are fewer.

Description

technical field [0001] The invention relates to a method for measuring the firing temperature range of an electric porcelain body by using a high-temperature dilatometer. Background technique [0002] During the firing process of the electric porcelain body, there will be a certain process of expansion and contraction of the body. When the ceramic body shrinks to a certain extent, the body will undergo more significant changes: such as different colors, increased specific gravity, reduced volume, greatly improved hardness and mechanical strength, and become extremely stable to water and acid. This change in performance promotes the green body to have certain chemical, physical and mechanical properties to meet the requirements of the electrical and power industries. [0003] The ultimate goal of the electric porcelain process is to produce products with high mechanical and electrical strength and good thermal and cooling performance. To meet this requirement, the green body...

Claims

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Application Information

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IPC IPC(8): G01N25/02G01N25/16
Inventor 沈骏李红宝
Owner CHINA XD ELECTRIC CO LTD
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