CN104402460A - Self-levelling insulation castable for thermocouple packaging - Google Patents
Self-levelling insulation castable for thermocouple packaging Download PDFInfo
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- CN104402460A CN104402460A CN201410575223.0A CN201410575223A CN104402460A CN 104402460 A CN104402460 A CN 104402460A CN 201410575223 A CN201410575223 A CN 201410575223A CN 104402460 A CN104402460 A CN 104402460A
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Abstract
The invention discloses a self-levelling insulation castable for thermocouple packaging. The self-levelling insulation castable for thermocouple packaging is composed of the following components: brown corundum size sand, brown corundum fine powder, alumina powder, fused alumina cement and a water reducing agent. Through grain size distribution refinement and the like, the self-lleveling insulation castable for thermocouple packaging can realize automatic filling and filling space enriching without vibration under the circumstance of adding tap water, phosphoric acid or phosphate solution is not needed as a binding agent, and no external force is needed in the filling process to perform vibration. Tap water is directly added in the castable involved in the invention to realize even stirring, and then the evenly stirred castable is poured into the filling space needing casting. The castable can realize automatic filling and filling space enriching depending on self gravity, thereby realizing degassing levelling and densification.
Description
Technical field
The present invention relates to thermopair parcel material, particularly a kind of thermopair parcel Self-leveling insulating casting material.
Background technology
Quick temperature measuring thermocouple (having another name called: disposable deflection type thermopair) is disposable deflection type thermopair for measuring the temperature of molten steel and high-temperature molten metal.Its principle of work is the thermoelectric effect according to metal, and molten steel and high molten metal temperature are measured in the thermoelectric potential utilizing thermopair two ends to produce.Quick temperature measuring thermocouple is formed primarily of the even head of thermometric and large paper tube.Even head mainly contains positive and negative thermo wires and is welded on compensating lead wire, and compensating lead wire is worn and is embedded on support, and support overcoat has conette, and thermo wires is with quartz supports and protection.Outermost is equipped with slag-proofing cap, and whole spare part is concentrated and loaded in mud head and bond in aggregates with refractory filler, and non-dismountable, therefore is single use.Refractory filler is also called thermopair parcel insulating casting material, owing to needing, the space of cast is very narrow and small (is highly about 30 millimeters, upper diameter is about 13 millimeters, lower diameter is about 7 millimeters), common mould material is difficult in narrow space like this, rely on self gravitation to tamp by casting space; Therefore, thermopair parcel insulating casting material of the prior art needs when cast in mould material, to add phosphoric acid or phosphate solution as bonding agent, and in casting process, needs continuous vibration, so that mould material can be tamped by levelling.
But, there is following technological deficiency in this mould material of the prior art: 1, fire resistant infilling humidity resistance is poor, after thermopair processes, if leave relative humidity in be greater than 2-3 in the air of 60% individual hour, the insulating property of fire resistant infilling just significantly reduce (resistance is reduced to below 5M Ω), so just cannot directly use in actual production.And; because the humidity resistance of fire resistant infilling is poor, be greater than in the air of 60% deposit more than 3 hours in relative humidity, the intensity of fire resistant infilling will decline; slag-proofing cap (aluminium cap) generation is loosened even come off, the provide protection to U-shaped silica tube will be lost like this.2, use phosphoric acid or phosphate solution to be in harmonious proportion mould material just being tamped by vibration as bonding agent, not environmentally, can damage human body in process of manufacture.
Summary of the invention
In view of this, the invention reside in provide a kind of can need not vibrate in quantitative tap water situation can automatic filling enrich the thermopair parcel Self-leveling insulating casting material of filling space adding.
For solving the problem, the present invention adopts following technical scheme: thermopair parcel Self-leveling insulating casting material, is made up of following component: Brown Alundum sand, Brown Alundum fine powder, aluminum oxide powder, fused alumina cement and water reducer.
Above-mentioned thermopair parcel Self-leveling insulating casting material, described corundum sand is made up of 30-40 order Brown Alundum sand, 50-60 order Brown Alundum sand, 70-80 order Brown Alundum sand, 90-100 order Brown Alundum sand and 110-120 order Brown Alundum sand.
Above-mentioned thermopair parcel Self-leveling insulating casting material, described Brown Alundum fine powder is greater than 0 order by granularity and is less than or equal to 180 object Brown Alundum fine powders and 200-325 object Brown Alundum fine powder forms.
Above-mentioned thermopair parcel Self-leveling insulating casting material, the aluminum oxide powder of described aluminum oxide powder to be granularity be 3-5 micron.
Above-mentioned thermopair parcel Self-leveling insulating casting material, described fused alumina cement is fused alumina cement CA-80.
Above-mentioned thermopair parcel Self-leveling insulating casting material, described water reducer is water reducer FS-20.
Above-mentioned thermopair parcel Self-leveling insulating casting material, is made up of the component of following weight part: Brown Alundum sand 37-61 weight part, Brown Alundum fine powder 16-27 weight part, aluminum oxide powder 18-25 weight part, fused alumina cement 5-11 weight part, water reducer 0.05-0.25 weight part, chromium sesquioxide 2-4 weight part and molybdenumdisulphide 1-3 weight part.
Above-mentioned thermopair parcel Self-leveling insulating casting material, described corundum sand is made up of 30-40 order Brown Alundum sand, 50-60 order Brown Alundum sand, 70-80 order Brown Alundum sand, 90-100 order Brown Alundum sand and 110-120 order Brown Alundum sand; 30-40 order Brown Alundum sand is 4-12 weight part, 50-60 order Brown Alundum sand is 6-12 weight part, 70-80 order Brown Alundum sand is 2-5 weight part, 90-100 order Brown Alundum sand be 10-15 weight part and 110-120 order Brown Alundum sand is 13-17 weight part.
Above-mentioned thermopair parcel Self-leveling insulating casting material, described Brown Alundum fine powder is greater than 0 order by granularity and is less than or equal to 180 object Brown Alundum fine powders and 200-325 object Brown Alundum fine powder forms; Granularity is greater than 0 order and is less than or equal to 180 object Brown Alundum fine powders is 8-13 weight part, and 200-325 object Brown Alundum fine powder is 8-14 weight part, and the granularity of chromium sesquioxide is 200-300 order, and the granularity of molybdenumdisulphide is 150-300 order.
Above-mentioned thermopair parcel Self-leveling insulating casting material, in described thermopair parcel Self-leveling insulating casting material: the massfraction of aluminium sesquioxide is greater than 90%, the massfraction of silicon-dioxide is less than or equal to 1.2%, the massfraction of ferric oxide is less than or equal to 0.6%, and the massfraction of calcium oxide is more than or equal to 3.2%.
The invention has the beneficial effects as follows: (1) gravity flow filling performance is good: need not add phosphoric acid or phosphate solution as bonding agent, and do not need to apply external force in stowing operation to vibrate, directly in mould material of the present invention, add tap water, then the filling space around thermopair is poured into, mould material relies on self gravitation also can enrich filling space by automatic filling, realizes degassed levelling and densification.(2) folding strength and ultimate compression strength high.(3) good insulation preformance.(4) thermometric accuracy is high.(5) moisture effect is good.(6) indeformable under high temperature, do not burst.
The present invention, by grain size distribution refinement, realizes the gravity flow of mould material, pouring layer can be made to fill more closely knit without the need to vibration; and then it is homogeneous to make dried pouring layer have mechanical property; produce without cavity, bubble-free, ensure that adequately protecting and wearing quality to thermopair.
The magnesia filler of acidity that thermopair parcel Self-leveling insulating casting material of the present invention has departed from the development eighties in last century completely uses phosphoric acid salt or phosphoric acid solution to carry out stirring cast, and just directly can pour into a mould even head after now using tap water to stir, quiet put 12 hours after just can enter oven cooking cycle, shorten than the magnesia filler of convention acidic the insulation index that one times of baking time just can reach desirable, adapt to modernization steel mill determines oxygen accuracy to measuring temp of molten steel.Thermopair parcel Self-leveling insulating casting material of the present invention has that excellent auto flowability, moistureproofness, property simple to operate, thermometric accuracy, high-insulativity, physical strength are high, indeformable under high temperature, the advantage such as do not burst.
Use thermopair parcel Self-leveling insulating casting material of the present invention; optimize fast thermocouple manufacturing process; substantially increase the stability of product and the accuracy of thermometric; avoid all drawbacks of acid magnesia filler simultaneously; while protection of the environment; saving a large amount of human and material resources and production cost, is the trend of fast thermocouple pouring production technique from now on, for the filling production of automatization provides favourable condition.
Embodiment
For clearly demonstrating the scheme in the present invention, providing preferred embodiment below and being described in detail.
Embodiment 1
Self-leveling insulating casting material used by the present embodiment thermopair parcel, is made up of: Brown Alundum sand, Brown Alundum fine powder, aluminum oxide powder, fused alumina cement and water reducer following component.
Described corundum sand is made up of 30-40 order Brown Alundum sand, 50-60 order Brown Alundum sand, 70-80 order Brown Alundum sand, 90-100 order Brown Alundum sand and 110-120 order Brown Alundum sand; 30-40 order Brown Alundum sand is 10 kilograms, 50-60 order Brown Alundum sand is 10 kilograms, 70-80 order Brown Alundum sand is 3 kilograms, 90-100 order Brown Alundum sand is 12 kilograms, 110-120 order Brown Alundum sand is 15 kilograms.
Described Brown Alundum fine powder is greater than 0 order by granularity and is less than or equal to 180 object Brown Alundum fine powders and 200-325 object Brown Alundum fine powder forms; Granularity is greater than 0 order and is less than or equal to 180 object Brown Alundum fine powders is 10 kilograms, and 200-325 object Brown Alundum fine powder is 10 kilograms.
The aluminum oxide powder of described aluminum oxide powder to be the granularity of 22 kilograms be 3-5 micron, described fused alumina cement is the fused alumina cement of 8 kilograms, and described water reducer is the water reducer of 0.15 kilogram.In the present embodiment: the fused alumina cement that described fused alumina cement can select prior art known, as: fused alumina cement CA-80; The water reducer that described water reducer can select prior art known, as: water reducer FS-20.
In the thermopair parcel Self-leveling insulating casting material of the present embodiment: the massfraction of aluminium sesquioxide is 95%, the massfraction of silicon-dioxide is 1%, and the massfraction of ferric oxide is 0.4%, and the massfraction of calcium oxide is 3.5%.
In thermopair process of manufacture, Self-leveling insulating casting material used by the thermopair parcel of double centner the present embodiment, add the tap water of 15 kilograms, directly pour in the space of needs cast after stirring, need not vibrate, thermopair parcel Self-leveling insulating casting material relies on self gravitation also can enrich casting space by automatic filling, and realize degassed levelling and densification, 80 DEG C × 24h can directly come into operation or save backup after drying.
Embodiment 2
Self-leveling insulating casting material used by the present embodiment thermopair parcel, is made up of: Brown Alundum sand, Brown Alundum fine powder, aluminum oxide powder, fused alumina cement and water reducer following component.
Described corundum sand is made up of 30-40 order Brown Alundum sand, 50-60 order Brown Alundum sand, 70-80 order Brown Alundum sand, 90-100 order Brown Alundum sand and 110-120 order Brown Alundum sand; 30-40 order Brown Alundum sand is 4 kilograms, 50-60 order Brown Alundum sand is 12 kilograms, 70-80 order Brown Alundum sand is 5 kilograms, 90-100 order Brown Alundum sand be 15 kilograms and 110-120 order Brown Alundum sand is 17 kilograms.
Described Brown Alundum fine powder is greater than 0 order by granularity and is less than or equal to 180 object Brown Alundum fine powders and 200-325 object Brown Alundum fine powder forms; Granularity is greater than 0 order and is less than or equal to 180 object Brown Alundum fine powders is 8 kilograms, and 200-325 object Brown Alundum fine powder is 14 kilograms.
The aluminum oxide powder of described aluminum oxide powder to be the granularity of 18 kilograms be 3-5 micron, described fused alumina cement is the fused alumina cement of 7 kilograms, and described water reducer is the water reducer of 0.1 kilogram.In the present embodiment: the fused alumina cement that described fused alumina cement can select prior art known, as: fused alumina cement CA-80; The water reducer that described water reducer can select prior art known, as: water reducer FS-20.
In the thermopair parcel Self-leveling insulating casting material of the present embodiment: the massfraction of aluminium sesquioxide is 96%, the massfraction of silicon-dioxide is 0.8%, and the massfraction of ferric oxide is 0.5%, and the massfraction of calcium oxide is 3.3%.
In thermopair process of manufacture, Self-leveling insulating casting material used by the thermopair parcel of double centner the present embodiment, add the tap water of 15 kilograms, directly pour in the space of needs cast after stirring, need not vibrate, thermopair parcel Self-leveling insulating casting material relies on self gravitation also can enrich casting space by automatic filling, and realize degassed levelling and densification, 80 DEG C × 24h can directly come into operation or save backup after drying.
Embodiment 3
Self-leveling insulating casting material used by the present embodiment thermopair parcel, is made up of: Brown Alundum sand, Brown Alundum fine powder, aluminum oxide powder, fused alumina cement and water reducer following component.
Described corundum sand is made up of 30-40 order Brown Alundum sand, 50-60 order Brown Alundum sand, 70-80 order Brown Alundum sand, 90-100 order Brown Alundum sand and 110-120 order Brown Alundum sand; 30-40 order Brown Alundum sand is 12 kilograms, 50-60 order Brown Alundum sand is 8 kilograms, 70-80 order Brown Alundum sand is 5 kilograms, 90-100 order Brown Alundum sand be 10 kilograms and 110-120 order Brown Alundum sand is 13 kilograms.
Described Brown Alundum fine powder is greater than 0 order by granularity and is less than or equal to 180 object Brown Alundum fine powders and 200-325 object Brown Alundum fine powder forms; Granularity is greater than 0 order and is less than or equal to 180 object Brown Alundum fine powders is 10 kilograms, and 200-325 object Brown Alundum fine powder is 13 kilograms.
The aluminum oxide powder of described aluminum oxide powder to be the granularity of 19 kilograms be 3-5 micron, described fused alumina cement is 10 kilograms of fused alumina cement, and described water reducer is the water reducer of 0.25 kilogram.In the present embodiment: the fused alumina cement that described fused alumina cement can select prior art known, as: fused alumina cement CA-80; The water reducer that described water reducer can select prior art known, as: water reducer FS-20.
In the thermopair parcel Self-leveling insulating casting material of the present embodiment: the massfraction of aluminium sesquioxide is 93%, the massfraction of silicon-dioxide is 1.2%, and the massfraction of ferric oxide is 0.3%, and the massfraction of calcium oxide is 3.7%.
In thermopair process of manufacture, Self-leveling insulating casting material used by the thermopair parcel of double centner the present embodiment, add the tap water of 15 kilograms, directly pour in the space of needs cast after stirring, need not vibrate, thermopair parcel Self-leveling insulating casting material relies on self gravitation also can enrich casting space by automatic filling, and realize degassed levelling and densification, 80 DEG C × 24h can directly come into operation or save backup after drying.
the performance test of Self-leveling insulating casting material of thermopair parcel in embodiment 1 to embodiment 3
data are as shown in table 1 below:
Table 1
Embodiment 4
Embodiment 4 is with the difference of embodiment 1: add the chromium sesquioxide of 3 kilograms and the molybdenumdisulphide of 2 kilograms, the granularity of chromium sesquioxide is 200-300 order, and the granularity of molybdenumdisulphide is 150-300 order.
In thermopair process of manufacture, Self-leveling insulating casting material used by the thermopair parcel of double centner the present embodiment, add the tap water of 15 kilograms, directly pour in the space of needs cast after stirring, need not vibrate, thermopair parcel Self-leveling insulating casting material relies on self gravitation also can enrich casting space by automatic filling, and realize degassed levelling and densification, 80 DEG C × 24h can directly come into operation or save backup after drying.
Embodiment 5
Embodiment 4 is with the difference of embodiment 1: add the chromium sesquioxide of 3 kilograms and the molybdenumdisulphide of 2 kilograms, the granularity of chromium sesquioxide is 200-300 order, and the granularity of molybdenumdisulphide is 150-300 order.
In thermopair process of manufacture, Self-leveling insulating casting material used by the thermopair parcel of double centner the present embodiment, add the tap water of 15 kilograms, directly pour in the space of needs cast after stirring, need not vibrate, thermopair parcel Self-leveling insulating casting material relies on self gravitation also can enrich casting space by automatic filling, and realize degassed levelling and densification, 80 DEG C × 24h can directly come into operation or save backup after drying.
Embodiment 6
Embodiment 4 is with the difference of embodiment 1: add the chromium sesquioxide of 3 kilograms and the molybdenumdisulphide of 2 kilograms, the granularity of chromium sesquioxide is 200-300 order, and the granularity of molybdenumdisulphide is 150-300 order.
In thermopair process of manufacture, Self-leveling insulating casting material used by the thermopair parcel of double centner the present embodiment, add the tap water of 15 kilograms, directly pour in the space of needs cast after stirring, need not vibrate, thermopair parcel Self-leveling insulating casting material relies on self gravitation also can enrich casting space by automatic filling, and realize degassed levelling and densification, 80 DEG C × 24h can directly come into operation or save backup after drying.
the performance test of Self-leveling insulating casting material of thermopair parcel in embodiment 4 to embodiment 6
data are as shown in table 2 below:
Table 2
As can be seen from embodiment 1-6: use the fire resistant infilling that thermopair parcel Self-leveling insulating casting material of the present invention is formed, its humidity resistance is fine.After thermopair in embodiment 1-3 processes, leaving relative humidity in is in the air of 70% 48 hours, and the resistance of fire resistant infilling is still greater than 5M Ω, can directly use in actual production, meets the requirement that thermopair uses.After thermopair in embodiment 4-6 processes, leaving relative humidity in is in the air of 70% 72 hours, and the resistance of fire resistant infilling is greater than 5M Ω, can directly use in actual production, meets the requirement that thermopair uses.The performance test data of table 1 and table 2 fully shows: use the thermopair that thermopair parcel Self-leveling insulating casting material of the present invention is made, moisture effect is very good, can preserve for a long time, even if be greater than in the environment of 70% at relative air humidity, also can preserve more than two days and not affect normal use.In addition, when in use, amount of water can for any number between the 15wt%-18wt% of thermopair parcel Self-leveling insulating casting material total mass of the present invention.
Above-described embodiment is only for the invention example is clearly described, and the restriction not to the invention embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All within the spirit and principles in the present invention any apparent change of extending out or variation be still among the protection domain of the claims in the present invention.
Claims (10)
1. Self-leveling insulating casting material used by thermopair parcel, it is characterized in that, is made up of following component: Brown Alundum sand, Brown Alundum fine powder, aluminum oxide powder, fused alumina cement and water reducer.
2. thermopair parcel Self-leveling insulating casting material according to claim 1, it is characterized in that, described corundum sand is made up of 30-40 order Brown Alundum sand, 50-60 order Brown Alundum sand, 70-80 order Brown Alundum sand, 90-100 order Brown Alundum sand and 110-120 order Brown Alundum sand.
3. thermopair parcel Self-leveling insulating casting material according to claim 1, is characterized in that, described Brown Alundum fine powder is greater than 0 order by granularity and is less than or equal to 180 object Brown Alundum fine powders and 200-325 object Brown Alundum fine powder forms.
4. thermopair parcel Self-leveling insulating casting material according to claim 1, is characterized in that, the aluminum oxide powder of described aluminum oxide powder to be granularity be 3-5 micron.
5. thermopair parcel Self-leveling insulating casting material according to claim 1, is characterized in that, described fused alumina cement is fused alumina cement CA-80.
6. thermopair parcel Self-leveling insulating casting material according to claim 1, it is characterized in that, described water reducer is water reducer FS-20.
7. thermopair parcel Self-leveling insulating casting material according to claim 1, it is characterized in that, be made up of the component of following weight part: Brown Alundum sand 37-61 weight part, Brown Alundum fine powder 16-27 weight part, aluminum oxide powder 18-25 weight part, fused alumina cement 5-11 weight part and water reducer 0.05-0.25 weight part, chromium sesquioxide 2-4 weight part and molybdenumdisulphide 1-3 weight part.
8. thermopair parcel Self-leveling insulating casting material according to claim 7, it is characterized in that, described corundum sand is made up of 30-40 order Brown Alundum sand, 50-60 order Brown Alundum sand, 70-80 order Brown Alundum sand, 90-100 order Brown Alundum sand and 110-120 order Brown Alundum sand; 30-40 order Brown Alundum sand is 4-12 weight part, 50-60 order Brown Alundum sand is 6-12 weight part, 70-80 order Brown Alundum sand is 2-5 weight part, 90-100 order Brown Alundum sand be 10-15 weight part and 110-120 order Brown Alundum sand is 13-17 weight part.
9. thermopair parcel Self-leveling insulating casting material according to claim 8, is characterized in that, described Brown Alundum fine powder is greater than 0 order by granularity and is less than or equal to 180 object Brown Alundum fine powders and 200-325 object Brown Alundum fine powder forms; Granularity is greater than 0 order and is less than or equal to 180 object Brown Alundum fine powders is 8-13 weight part, and 200-325 object Brown Alundum fine powder is 8-14 weight part, and the granularity of chromium sesquioxide is 200-300 order, and the granularity of molybdenumdisulphide is 150-300 order.
10. thermopair parcel Self-leveling insulating casting material according to claim 9, it is characterized in that, in described thermopair parcel Self-leveling insulating casting material: the massfraction of aluminium sesquioxide is greater than 90%, the massfraction of silicon-dioxide is less than or equal to 1.2%, the massfraction of ferric oxide is less than or equal to 0.6%, and the massfraction of calcium oxide is more than or equal to 3.2%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105924185A (en) * | 2016-04-22 | 2016-09-07 | 长兴县中泰耐火材料有限公司 | Self-flow castable material with purifying effect on molten steel and construction method thereof |
| US11492529B2 (en) * | 2018-01-08 | 2022-11-08 | Laticrete International, Inc. | Energy efficient cementitious mortars |
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| CN1414569A (en) * | 2001-10-23 | 2003-04-30 | 洛阳市洛华粉体工程特种耐火材料厂 | Insulating dry filler of molten zinc power frequency cored electric furnace inductor |
| CN101429011A (en) * | 2008-12-10 | 2009-05-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Low-temperature curing ceramic powder and method for producing the same |
| CN102515694A (en) * | 2011-12-29 | 2012-06-27 | 浙江晟翔电子科技有限公司 | Preparation method for insulating fillers |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414569A (en) * | 2001-10-23 | 2003-04-30 | 洛阳市洛华粉体工程特种耐火材料厂 | Insulating dry filler of molten zinc power frequency cored electric furnace inductor |
| CN101429011A (en) * | 2008-12-10 | 2009-05-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Low-temperature curing ceramic powder and method for producing the same |
| CN102515694A (en) * | 2011-12-29 | 2012-06-27 | 浙江晟翔电子科技有限公司 | Preparation method for insulating fillers |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105924185A (en) * | 2016-04-22 | 2016-09-07 | 长兴县中泰耐火材料有限公司 | Self-flow castable material with purifying effect on molten steel and construction method thereof |
| US11492529B2 (en) * | 2018-01-08 | 2022-11-08 | Laticrete International, Inc. | Energy efficient cementitious mortars |
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