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Porous inert material and application thereof in thermal conduction element

A technology of inert materials and components, applied in the application field of thermal conductivity components, can solve problems such as difficult instrument zero stability, short transmission signal distance, and increased raw material costs, so as to reduce scrap rate, improve service life, raw materials and production The effect of cost reduction

Active Publication Date: 2010-10-06
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early 20th century, metal wires were directly exposed to make heat-sensitive elements. This kind of element can only measure high-concentration methane, and it is difficult to maintain the stability of the zero point of the instrument for a long time.
At present, platinum wire is used to coat alumina and then wrapped with glass body. The diameter of platinum wire is about 0.02mm, the middle part is coiled into a spiral shape, and the two ends are spot welded on the metal lead. Aluminum oxide is used for high temperature resistance and non-conductivity. The coiled platinum wire is insulated, and the glass body ensures the strength of the platinum wire after electrification, so that the element can measure methane content with a low concentration, and the stability is guaranteed, but the reaction speed is slow, the sensitivity is poor, and the transmission is caused by the wrapped alumina and glass body. The signal distance is short, which cannot meet the current new coal mine safety standards. At the same time, the cost of raw materials increases, and the increase in processing procedures leads to an increase in the scrap rate in production. The weight of the entire platinum wire increases and the welding of the lead wire is shock-resistant. It is very easy to damage when dropped, and the service life is not long.

Method used

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  • Porous inert material and application thereof in thermal conduction element
  • Porous inert material and application thereof in thermal conduction element
  • Porous inert material and application thereof in thermal conduction element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The porous inert material comprises the following raw materials in parts by weight:

[0027] SiO 2 30

[0028] Zn(NO3) 2 .6H 2 O 15

[0029] Mg(NO3) 2 .6H 2 O 16

[0030] CaCO 3 6

[0031] al 2 o 3 6

[0032] ZrOCl 2 .8H 2 O 3

[0033] h 3 BO 3 3

[0034] NaOH 1

[0035] KOH 1

[0036] The prepared raw materials were dry-milled for half an hour, wet-milled for 1 hour, and dried in an oven at 120°C. Put it into a platinum evaporating dish for calcination, keep it warm at 1300°C for 2 hours, cut off the power, cool naturally, and form a block; take out the block material, dry grind it for half an hour, add water and wet grind it for 1 hour, and dry it in an oven at 120°C to obtain Powder, proportioning SiO2 of 3% of the total weight of the powder after drying, adding water to configure a solution with a concentration of 10%, and then SiO 2 The solution is uniformly mixed with the dried p...

Embodiment 2

[0040] The porous inert material comprises the following raw materials in parts by weight:

[0041] SiO 2 32

[0042] Zn(NO3) 2 .6H 2 O 17

[0043] Mg(NO3) 2 .6H 2 O 18

[0044] CaCO 37

[0045] al 2 o 3 7

[0046] ZrOCl 2 .8H 2 O 4

[0047] h 3 BO 3 4

[0048] NaOH 1.5

[0049] KOH 1.5

[0050] The prepared raw materials were dry-milled for half an hour, wet-milled for 1 hour, and dried in an oven at 120°C. Put it into a platinum evaporating dish for calcination, keep it warm at 1200°C for 3 hours, cut off the power, cool naturally, and form a block; take out the block material, dry grind it for half an hour, add water and wet grind it for 1 hour, and dry it in an oven at 120°C to obtain a powder , proportioning SiO2 of 5% of the total weight of the powder after drying, adding water to configure a solution with a concentration of 20%, and then SiO 2 The solution is uniformly mixed with the dried powde...

Embodiment 3

[0054] The porous inert material comprises the following raw materials in parts by weight:

[0055] SiO 2 35

[0056] Zn(NO3) 2 .6H 2 O 20

[0057] Mg(NO3) 2 .6H 2 O 19

[0058] CaCO 3 9

[0059] al 2 o 3 8

[0060] ZrOCl 2 .8H 2 O 5

[0061] h 3 BO 3 5

[0062] NaOH 2

[0063] KOH 2

[0064] The prepared powder was dry-milled for half an hour, wet-milled for 1 hour, and dried in an oven at 120°C. Put it in a platinum evaporating dish for calcination, keep it warm at 1200±100°C for 2 to 5 hours, turn off the power, cool naturally, and form a block; take out the block material, dry grind it for half an hour, add water and wet it for 1 hour, and put it in an oven at 120°C Dry to obtain powder, mix SiO2 with a total weight of 3% to 8% of the dried powder, add water to make a solution with a concentration of 10% to 30%, and then SiO 2 The solution is uniformly mixed with the dried powder to prepare a por...

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Abstract

The invention discloses a porous inert material. According to weight proportion, the raw material of the invention comprises: 30 to 35 portions of SiO2, 15 to 20 portions of Zn (NO3)2 . 6H2O, 16 to 19 portions of 6H2O, 6 to 9 portions of CaCO3, 6 to 8 portions of Al2O3, 3 to 5 portions of ZrOCl2.8H2O, 3 to 5 portions of H3BO3, 1 to 2 portions of NaOH, 1 to 2 portions of KOH. The materials are ground and evenly mixed with SiO2 solution. The invention also discloses an application of the porous inert material on a heating conductive element; a platinum wire is coated with the porous insert material, thus ensuring the performances of insulation, high temperature resistance and the intensity of the platinum during electrified; at the same time the coated surface also has a plurality of nanometer small holes, which improves the transmission distance of high and low methane sensors and sensitivity of heat conductive elements and extends transmission distance of the transmission signals; theinvention has the advantages of reducing production cost and prolonging service life of elements.

Description

technical field [0001] The invention belongs to an inert material and its application, specifically, a porous inert material and its application in measuring mine CH 4 Concentration of thermally conductive components on application. Background technique [0002] In coal mines, the CH in the mine needs to be 4 At present, thermal conductivity sensitive elements are used to detect methane. The principle is that the thermal conductivity of methane is different from that of other gases in coal mines. Since the thermal conductivity of the gas is too small to measure directly, an indirect method is used. Measurement method, the measurement of thermal conductivity is transformed into the measurement of the resistance change of the thermal conductivity sensitive element. In addition, the resistance change of the sensitive element and the methane content in the measured gas have a linear relationship within a certain range, so it can be measured by measuring the resistance element ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/14C04B35/622
Inventor 朱正和于庆黄强樊荣廖德林毛小波李莹莹
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD