CN101333112A - Method for preparing silicon carbide porous ceramic by burning - Google Patents
Method for preparing silicon carbide porous ceramic by burning Download PDFInfo
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- CN101333112A CN101333112A CNA2007100724198A CN200710072419A CN101333112A CN 101333112 A CN101333112 A CN 101333112A CN A2007100724198 A CNA2007100724198 A CN A2007100724198A CN 200710072419 A CN200710072419 A CN 200710072419A CN 101333112 A CN101333112 A CN 101333112A
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Abstract
Disclosed is a combustion synthesis method for preparing porous silicon carbide ceramic. Along with the growing demand of special ceramic material, boosting the production efficiency and reducing the production costs become hot spots in the special ceramic material research. The invention comprises porous ceramic design, powder milling and combustion synthesis; the combustion synthesis is to pour the dried powders into a mold in a loose form, and then pile up a layer of ignition agent next to the mold; when the combustion synthesis starts, the power supply of a thermal resistor is connected, so the resistor is heated to ignite the ignition agent, and the powders also start burning; after the powders are combusted for 40-60s, 100-150t of pressure is exerted on the press head so that the ceramic is formed; the pressure is maintained until the ceramic is cooled to room temperature. The invention is applied to material field.
Description
Technical field:
The present invention relates to a kind of combustion synthesis method preparation method of carborundum porous ceramics.
Background technology:
Along with the increase day by day of special ceramic material demand, enhancing productivity, reducing production costs has become the focus of present special ceramic material research.Combustion synthesis process has that technology is easy, less investment, do not need complexity, expensive tooling and equipment, in the combustion processes vaporization at high temperature fall impurity and make product purification, energy-conservation, production efficiency is high, the cycle is short, cost is low, can obtain non-equilibrium phase and metastable phase, can utilize the chemical energy of reactant, realize the advantages such as synthetic and consolidation of inorganic materials simultaneously, very advantageous aspect the preparation of engineering ceramics.Burning is synthetic be utilize external heat source with raw material powder or the blank that is pressed into certain density in advance carry out part or whole heating, when temperature reaches ignition temperature, remove external heat source, solid utilize that feed particles takes place solid-or gas-solid reaction a large amount of reaction heat of emitting make to react and proceeded, all raw material reactions finish and obtain reaction product at last.
Porous material is meant the material of the pore texture with certain size and quantity, and porosity is bigger usually, and pore texture exists as useful structure.The size of hole, quantity and distribution are the principal elements that influences the porous material performance, and these features can be adjusted control by preparation technology.Pottery, metal and organism material can be made vesicular structure, utilize the pore texture of porous material can satisfy the different demands of 26S Proteasome Structure and Function.
Summary of the invention:
The purpose of this invention is to provide that a kind of employing is low-cost, high efficiency method prepares carborundum porous ceramics.
Above-mentioned purpose realizes by following technical scheme:
The combustion synthesis method of preparation carborundum porous ceramics, its composition comprises: the design of porous ceramics, powder process, burning are synthesized, described burning is synthetic to be that dried powder is poured in the mould with loose form, and at mould next door stacking one deck detonator, take fire when synthesizing, connect the power supply of heating resistor, make its heating, detonator is lighted, and under the effect of detonator, powder also takes fire, behind powder burning 40-60s, on pressure head, apply the pressure of 100-150t, make its moulding, and keep this pressure to be cooled to room temperature always until it.
The combustion synthesis method of described preparation carborundum porous ceramics, described design is the performance requriements that obtains porous silicon carbide ceramic as required, calculate the composition and the proportioning thereof of silicon carbide, wherein the ratio of weight and number of titanium valve, amorphous graphite powder is 4: 1, with the ratio of weight and number of silica flour, amorphous graphite powder 7: 3, the part by weight that two kinds of mixtures mix is 1: 1 or 1: 3, then the powder for preparing is poured in the ball mill, the ball milling that carries out, the final powder that mixes that forms, powder is taken out from ball mill, put into container and carry out drying.
This technical scheme has following beneficial effect:
1. combustion synthesis method prepares carborundum porous ceramics and has effects such as loss of weight, filtration, catalysis, damping, separation, can be used for fields such as oil, chemical industry, aerospace, smelting, medicine, environmental protection.
2. a large amount of gas that produces during owing to burning needs to discharge, and has liquid phase in combustion processes, therefore can produce the very big porous ceramics of void content.
The present invention to employed material purity require relatively lowly, therefore can reduce preparation cost;
4. the energy when sintering used in the present invention is synthetic is that the material spontaneous combustion obtains, and does not need extra energy except igniting, so can be energy-conservation;
5, the final purity of the porous ceramics that obtains of the present invention is very high;
6, the present invention can obtain non-equilibrium phase, metastable phase;
7, the present invention can utilize the chemical energy of reactant, realizes the synthetic and consolidation of inorganics simultaneously.
The specific embodiment of the present invention:
Embodiment 1:
A kind of combustion synthesis method for preparing carborundum porous ceramics, its composition comprises: the design of porous ceramics, powder process, burning are synthesized, described burning is synthetic to be that dried powder is poured in the mould 5 with loose form, and at mould next door stacking one deck detonator, and in other spaces of mould, add weighting material 3.Take fire when synthesizing, connect the power supply 6 of heating resistor 4, make its heating, detonator is lighted.Under the effect of detonator, powder also takes fire, and behind powder burning 40-60s, 1 pressure that applies 100-150t makes its moulding, and keeps this pressure to be cooled to room temperature until it always on pressure head.
Described design is the performance requriements that obtains porous silicon carbide ceramic as required, mainly be meant porosity, calculate the composition and the proportioning thereof of silicon carbide, wherein the ratio of weight and number of titanium valve, amorphous graphite powder is 4: 1, with the ratio of weight and number of silica flour, amorphous graphite powder 7: 3, the part by weight that two kinds of mixtures mix is 1: 1 or 1: 3, then the powder for preparing is poured in the ball mill, the ball milling that carries out, the final powder that mixes that forms, powder is taken out from ball mill, put into container and carry out drying.
Embodiment 2:
1. join powder and take by weighing a certain amount of Ti powder, Si powder and C powder respectively, their proportioning is Ti: Si: C=8: 7: 5.Take by weighing 40 gram Ti powder respectively, 35 gram Si powder and 25 gram amorphous graphite powders.And take by weighing 10 gram Ti and C powder and cook detonator, Ti powder 8 grams wherein, C powder 2 grams.
2. batch mixing three kinds of powders that will take by weighing mix, and carry out drying, and drying temperature is controlled at about 100 degree, and be 3 hours time of drying.
3. hot pressing is the loose mould of packing into of dried powder, and adds detonator, inserts weighting material in the vacant part in mould.To the resistance heater energising, make the detonator burning afterwards, light the Si-C-Ti system immediately.On pressure head, apply the pressure of 100-150t after 45 seconds in the burning of Si-C-Ti system, and keep.Temperature up to institute's mould is reduced to room temperature.This moment, the relative density of resulting product was 64%.
Embodiment 3:
1. join powder and take by weighing a certain amount of Ti powder, Si powder and C powder respectively, their proportioning is Ti: Si: C=24: 7: 9.Take by weighing 60 gram Ti powder respectively, 17.5 gram Si powder and 22.5.5 gram amorphous graphite powder.And take by weighing 10 gram Ti and C powder and cook detonator, Ti powder 8 grams wherein, C powder 2 grams.
2. batch mixing three kinds of powders that will take by weighing mix, and carry out drying, and drying temperature is controlled at about 100 degree, and be 3 hours time of drying.After the drying powder transferred to and carry out ball milling in the ball mill, the time is 12 hours.
3. hot pressing is the loose mould of packing into of dried powder, and adds detonator, inserts weighting material in the vacant part in mould.To the resistance heater energising, make the detonator burning afterwards, light the Si-C-Ti system immediately.On pressure head, apply the pressure of 100-150t after 45 seconds in the burning of Si-C-Ti system, and keep.Temperature up to institute's mould is reduced to room temperature.This moment, the relative density of resulting product was 45%.
Claims (2)
1. combustion synthesis method for preparing carborundum porous ceramics, its composition comprises: the design of porous ceramics, powder process, burning is synthetic, it is characterized in that: described burning is synthetic to be that dried powder is poured in the mould with loose form, and at mould next door stacking one deck detonator, take fire when synthesizing, connect the power supply of heating resistor, make its heating, detonator is lighted, and under the effect of detonator, powder also takes fire, behind powder burning 40-60s, on pressure head, apply the pressure of 100-150t, make its moulding, and keep this pressure to be cooled to room temperature always until it.
2. the combustion synthesis method of preparation carborundum porous ceramics according to claim 1, it is characterized in that: described design is the performance requriements that obtains porous silicon carbide ceramic as required, calculate the composition and the proportioning thereof of silicon carbide, titanium valve wherein, the ratio of weight and number of amorphous graphite powder 4: 1, with silica flour, the ratio of weight and number of amorphous graphite powder 7: 3, the part by weight that two kinds of mixtures mix is 1: 1 or 1: 3, then the powder for preparing is poured in the ball mill, the ball milling that carries out, the final powder that mixes that forms, powder is taken out from ball mill, put into container and carry out drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100724198A CN101333112A (en) | 2007-06-29 | 2007-06-29 | Method for preparing silicon carbide porous ceramic by burning |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100724198A CN101333112A (en) | 2007-06-29 | 2007-06-29 | Method for preparing silicon carbide porous ceramic by burning |
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| CN101333112A true CN101333112A (en) | 2008-12-31 |
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| CNA2007100724198A Pending CN101333112A (en) | 2007-06-29 | 2007-06-29 | Method for preparing silicon carbide porous ceramic by burning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104474785A (en) * | 2014-11-27 | 2015-04-01 | 景德镇陶瓷学院 | Silicon carbide ceramic filter plate and preparation method thereof |
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2007
- 2007-06-29 CN CNA2007100724198A patent/CN101333112A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104474785A (en) * | 2014-11-27 | 2015-04-01 | 景德镇陶瓷学院 | Silicon carbide ceramic filter plate and preparation method thereof |
| CN104474785B (en) * | 2014-11-27 | 2016-05-11 | 景德镇陶瓷学院 | A kind of silicon carbide ceramics filter and preparation method thereof |
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Open date: 20081231 |