CN101786863B - Production method of large-size insulator of 95 % ceramics - Google Patents
Production method of large-size insulator of 95 % ceramics Download PDFInfo
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- CN101786863B CN101786863B CN2009102645626A CN200910264562A CN101786863B CN 101786863 B CN101786863 B CN 101786863B CN 2009102645626 A CN2009102645626 A CN 2009102645626A CN 200910264562 A CN200910264562 A CN 200910264562A CN 101786863 B CN101786863 B CN 101786863B
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Abstract
The invention relates to a production method of a large-size insulator of 95 % ceramics, which is characterized by comprising the following processing steps of: a. raw material preparation; b. ball milling; c. sieving; d. mixing and stirring; e. deironing; f. pelleting; g. classifying; h. grading; i. static isopressure shaping; j. trimming; k. sintering; and l. processes of milling and polishing of insulator obtained by sintering and the like. The invention solves the problems of low mechanical strength and vulnerability because electrostatic precipitators only can use insulators of 95 % ceramics for a long time. The large-size insulator of 95 % ceramics, manufactured by utilizing the invention, has the advantages of high mechanical strength and big resistance value at high temperature.
Description
Technical field
The present invention relates to a kind of insulator production technique, especially a kind of working method of big specification 95 insulators,, the big insulator working method of specifically a kind of 95 porcelain.
Background technology
As everyone knows; For a long time; The big insulator insulator that is used for high-voltage electrostatic dust separator cathod system insulation support is to adopt 50 porcelain to carry out processing mostly, through long-term practice, generally believes that at present the physical strength of 50 porcelain and high temperature resistance value are all relatively poor; Be difficult to meet the needs of production, therefore be badly in need of seeking the upgrading substitute products.95 porcelain then have good high-temperature insulativity and enough physical strengths, but because the main raw material of 95 porcelain is Al
2O
3, aluminum oxide belongs to ridge property raw material, and difficulty is shaped; Firing temperature is high.Particularly make the hollow thin-wall product of big specification, technology difficulty is very big, distortion often occurs and bursts loss.
Summary of the invention
The objective of the invention is to present 95 porcelain because the problem that the shortage corresponding method of manufacture can't be applied in big specification insulator insulator on through the basis of trial-produceing successfully in a large number, provides a kind of 95 porcelain big insulator working method.
Technical scheme of the present invention is:
The big insulator working method of a kind of 95 porcelain is characterized in that it may further comprise the steps:
A, preparation of raw material: the weight percent of each component is: aluminum oxide 94-96%, lime carbonate 1.5-2.5%, silica sand 2-4%;
B, ball milling: place ball mill to carry out crushing ball above-mentioned batching and be milled to particle diameter less than the powder below 360 orders;
C, sieve: the powder that above-mentioned ball milling is obtained sieves with 360 mesh sieves, removes particle diameter greater than 360 a purposes material;
D, mix to stir: will above-mentionedly sieve obtains sticker that powder adding weight percent is 5-6% and an amount of water and stirs and obtain slurry;
E, deironing: make the above-mentioned slurry that obtains remove irony composition wherein through inhaling the iron machine;
F, granulation: the above-mentioned slurry of having removed the irony composition sent into utilize spray-drying process to carry out granulation in the prilling tower, obtain granular feedstock, the temperature in this process in the control prilling tower is not less than 400 ℃, tower internal pressure-100～200Pa;
G, classification: the granular feedstock that prilling tower is obtained carries out split pole, and grade scale is particle diameter>=0.12mm (an A level), and particle diameter≤0.015mm (C level) and particle diameter are between 0.015-0.12mm (B level);
H, grating: get A level granular feedstock 75-85%, B level granular feedstock 7-13%, C level granular feedstock 7-13% mix and obtain the static pressure raw material;
I, hydrostatic pressing: the static pressure raw material that above-mentioned grating is obtained places the mould of hydrostatic pressing machine, and control pressure is between 130MPa-150MPa, and release is taken out and obtained blank after pressurize 3-10 minute;
J, repaired biscuit: utilize machining tool that the gained blank is carried out mechanical workout, make it profile and conform to value with size;
K, burn till: the blank behind the above-mentioned repaired biscuit base is sent in the stoving oven is burnt till, the control firing temperature between 1550-1700 ℃, controlled temperature undulating quantity ± 10 ℃, soaking time 1～2 hour is burnt till the back naturally cooling;
L, with the above-mentioned insulator that burns till gained grind porcelain, polishing processing gets final product.
In order to prevent that the irony composition in the raw material from causing conduction to puncture, in iron removal, can carry out secondary deironing operation continuously, the process magnetic separator de-ironing is twice even slurry circulates.
Beneficial effect of the present invention:
The present invention is through a large amount of experiments; Found out the production technique of the hollow insulator of a cover big specification of 95 porcelain; Solved that electric precipitator for a long time can only use 50 porcelain insulators and the physical strength that exists is low; Flimsy problem, the big specification insulator of 95 porcelain that utilize the present invention to make has the physical strength height, the advantage that the high temperature resistance value is big.
Description of drawings
Fig. 1 is the concrete process flow diagram of advantage embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
As shown in Figure 1.
The big insulator working method of a kind of 95 porcelain, it may further comprise the steps:.
A, preparation of raw material: the weight percent of each component is: aluminum oxide 94-96%, lime carbonate 1.5-2.5%, silica sand 2-4%; Concrete batching is:
(1) aluminum oxide is 94 kilograms, 1.5 kilograms in lime carbonate, 2 kilograms of silica sands;
(2) aluminum oxide is 96 kilograms, 2.5 kilograms in lime carbonate, 4 kilograms of silica sands;
(3) aluminum oxide is 95 kilograms, 2 kilograms in lime carbonate, 3 kilograms of silica sands;
More than three can appoint and get one;
B, ball milling: place ball mill to carry out crushing ball above-mentioned batching and be milled to particle diameter less than the powder below 360 orders;
C, sieve: the powder that above-mentioned ball milling is obtained sieves with 360 mesh sieves, removes particle diameter greater than 360 a purposes material;
D, mix to stir: will above-mentionedly sieve obtains sticker (can adopt Z 150PH) that powder adding weight percent is 5-6% and an amount of water and stirs and obtain slurry, and the sliminess of slurry is being advisable through follow-up suction iron machine;
E, deironing: make the above-mentioned slurry that obtains remove irony composition wherein through inhaling iron machine (can adopt the suction iron machine identical) with prior art;
F, granulation: with the above-mentioned slurry of having removed the irony composition send into prilling tower (be similar to use in the fertilizer industry make the material tower) in utilize spray-drying process to carry out granulation; Obtain granular feedstock; Temperature in this process in the control prilling tower is not less than 400 ℃, tower internal pressure :-100～200Pa;
G, classification: the granular feedstock that prilling tower is obtained carries out split pole to be deposited, and grade scale is particle diameter>=0.12mm (an A level), and particle diameter≤0.015mm (C level) and particle diameter are between 0.015-0.12mm (B level);
H, grating: get A level granular feedstock 75-85% (weight percent, down with), B level granular feedstock 7-13%, C level granular feedstock 7-13% mix and obtain the static pressure raw material; Can calculate gross weight according to the size of final shaping prod when specifically getting material, add the foundation of an amount of repaired biscuit surplus as the grating calculated weight;
I, hydrostatic pressing: the static pressure raw material that above-mentioned grating is obtained places the mould of hydrostatic pressing machine; Control pressure is between 130MPa-150MPa; And the release taking-up obtains blank after pressurize 3-10 minute, unloads press operation and should carry out according to the service manual of hydrostatic pressing machine;
J, repaired biscuit: utilize machining tool that the gained blank is carried out mechanical workout, make it profile and conform to value with size;
K, burn till: the blank behind the above-mentioned repaired biscuit base is sent in the stoving oven is burnt till, the control firing temperature between 1550-1700 ℃, controlled temperature undulating quantity ± 10 ℃, soaking time 1～2 hour is burnt till the back naturally cooling; Concrete firing time can be selected to confirm referring to the relevant design handbook.
L, with the above-mentioned insulator that burns till gained grind porcelain (comprise and cut porcelain), the polishing process, be up to the standards at last, pack and can put in storage, wait ready for delivery.
Hydrostatic pressing technology used in the present invention is a nineties new developing technology in last century.Usually, the hydrostatic pressing technology relatively is suitable for suppressing cylindrical or the round shape base substrate, and is easy to generate defectives such as damaged and cracking when suppressing conical base substrate.In order to overcome this problem, should be when the core rod of the big insulator of compacting taper by the tapering processing of product requirement, it is conical that external mold is tending towards as far as possible, and powder produces axial slip when avoiding exerting pressure, and can effectively prevent the generation of crackle.
In addition, parameters such as the shape of the present invention through the strict control of spraying drying granulation powder, grain composition, bulk density, flowability also help to improve the quality of hydrostatic pressing.
It is the critical process of decision quality product that high temperature burns till, and the various defectives of ceramic product often all reflect through this procedure.Fire the big insulator of 95 porcelain, the kiln temperature must be even.So-called kiln temperature is even, from the time, just requires the temperature variation in the kiln to want evenly can not skyrocket and fall suddenly; Just require from the space in the kiln temperature everywhere to be consistent basically.In other words, be exactly that each ones of goods is heated and must keeps uniformity, otherwise, will occur bursting, defective such as distortion.Usually, fire the smaller goods of size, because its volume is less, whole prod is all shrouded in flame, and there is not bigger thermograde in each one of goods, and each one is heated even basically, generally can quality defects.But it is bigger like fruit product; Obstruct and shielding effect are played in the transmission of flame or temperature, met the flame face and bigger temperature head will occur, particularly in high-temperature shrinkage or hot mastication stage with back of the body flame face; If this occurs, will certainly produce the distortion and the cracking loss of goods.Distortion and cracking loss for fear of big insulator; Can be through adopting high combustion rate burner; Strengthen the stirring of flame in the kiln, rationally arrange setting density, between goods, leave suitable gap; Be convenient to flowing and on the roasting bearing of goods, slotting of flame, be convenient to flame and solve from the measures such as internal flow of goods.
The present invention does not relate to part and realizes like concrete stoving oven structure, all identical with the prior art prior aries that maybe can adopt such as concrete structure of hydrostatic pressing machine.
Claims (2)
1. big insulator working method of porcelain is characterized in that it may further comprise the steps:
A, preparation of raw material: the weight percent of each component is: aluminum oxide 94-96%, lime carbonate 1.5-2.5%, silica sand 2-4%;
B, ball milling: place ball mill to carry out crushing ball above-mentioned batching and be milled to particle diameter less than the powder below 360 orders;
C, sieve: the powder that above-mentioned ball milling is obtained sieves with 360 mesh sieves, removes particle diameter greater than 360 a purposes material;
D, mix to stir: will above-mentionedly sieve obtains sticker that powder adding weight percent is 5-6% and an amount of water and stirs and obtain slurry;
E, deironing: make the above-mentioned slurry that obtains remove irony composition wherein through inhaling the iron machine;
F, granulation: the above-mentioned slurry of having removed the irony composition sent into utilize spray-drying process to carry out granulation in the prilling tower, obtain granular feedstock, the temperature in this process in the control prilling tower is not less than 400 ℃, tower internal pressure-100～200Pa;
G, classification: the granular feedstock that prilling tower is obtained carries out split pole, and grade scale is particle diameter>=0.12mm, the A level; Particle diameter≤0.015mm, the C level; Particle diameter between 0.015-0.12mm, the B level;
H, grating: get A level granular feedstock 75-85%, B level granular feedstock 7-13%, C level granular feedstock 7-13% mix and obtain the static pressure raw material;
I, hydrostatic pressing: the static pressure raw material that above-mentioned grating is obtained places the mould of hydrostatic pressing machine, and control pressure is between 130MPa-150MPa, and release is taken out and obtained blank after pressurize 3-10 minute;
J, repaired biscuit: utilize machining tool that the gained blank is carried out mechanical workout, make it profile and conform to value with size;
K, burn till: the blank behind the above-mentioned repaired biscuit base is sent in the stoving oven is burnt till, the control firing temperature between 1550-1700 ℃, controlled temperature undulating quantity ± 10 ℃, soaking time 1～2 hour is burnt till the back naturally cooling;
L, with the above-mentioned insulator that burns till gained grind porcelain, polishing processing gets final product.
2. the big insulator working method of 95 porcelain according to claim 1 is characterized in that described deironing carries out secondary continuously.
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| CN105478056A (en) * | 2015-11-27 | 2016-04-13 | 山东义科节能科技有限公司 | Ceramic raw material dry method granulation production line and production technology |
| CN105732010A (en) * | 2016-01-14 | 2016-07-06 | 洛阳三睿宝纳米科技有限公司 | High-flexibility 95 ceramic and preparation method thereof |
| CN108191408A (en) * | 2018-01-09 | 2018-06-22 | 江苏省陶瓷研究所有限公司 | A kind of manufacturing method of radio emissioning antenna large scale higfh-tension ceramics insulator |
| CN109776078B (en) * | 2019-03-08 | 2020-08-04 | 景德镇陶瓷大学 | SiC-modified porous high-alumina ceramic material and preparation method thereof |
| CN111662074A (en) * | 2020-06-23 | 2020-09-15 | 宜兴市奥米那陶瓷有限公司 | Process for preparing forming raw materials of thin-wall and slender products of alumina ceramics difficult to form |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1238535A (en) * | 1998-06-05 | 1999-12-15 | 西安双佳高压电瓷电器有限公司 | Method for manufacturing isostatic ceramic sleeve |
| CN1512521A (en) * | 2002-12-30 | 2004-07-14 | 西安重型机械研究所 | Process for producing isostatic porcelain sleeve |
| CN1734303A (en) * | 2004-08-13 | 2006-02-15 | 王毅 | Method for making optical fiber ceramic sleeve |
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- 2009-12-28 CN CN2009102645626A patent/CN101786863B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1238535A (en) * | 1998-06-05 | 1999-12-15 | 西安双佳高压电瓷电器有限公司 | Method for manufacturing isostatic ceramic sleeve |
| CN1512521A (en) * | 2002-12-30 | 2004-07-14 | 西安重型机械研究所 | Process for producing isostatic porcelain sleeve |
| CN1734303A (en) * | 2004-08-13 | 2006-02-15 | 王毅 | Method for making optical fiber ceramic sleeve |
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