CN104876614A - Preparation method of short fiber reinforced silicon carbide ceramics containing silicon dioxide - Google Patents
Preparation method of short fiber reinforced silicon carbide ceramics containing silicon dioxide Download PDFInfo
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- CN104876614A CN104876614A CN201510184644.5A CN201510184644A CN104876614A CN 104876614 A CN104876614 A CN 104876614A CN 201510184644 A CN201510184644 A CN 201510184644A CN 104876614 A CN104876614 A CN 104876614A
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Abstract
The invention discloses a preparation method of short fiber reinforced silicon carbide ceramics containing silicon dioxide. The preparation method is characterized in that the short fiber reinforced silicon carbide ceramics are prepared from the following raw materials in parts by weight: 60-80 parts of silicon carbide, 10-15 parts of a chopped carbon fiber predispersion body, 3-4 parts of a sintering additive, 8-12 parts of a silicon dioxide grinding material, 2-3 parts of iridium trioxide, 4-6 parts of albite powder, 4-6 parts of mullite powder, 20-25 parts of absolute ethyl alcohol, 2-3 parts of polypropylene glycol and 70-80 parts of deionized water. According to the preparation method disclosed by the invention, chopped carbon fibers are added, so that the mechanical performance of silicon carbide can be improved, the fracture toughness of the ceramics can be improved, the strength and compactness of biscuits can be improved, and the mechanical processing requirements can be met; silicon dioxide is added, so that the effects of enhancing the thermal stability, strength, corrosion resistance and thermal conductivity of the silicon carbide ceramics can be achieved; and the preparation method is convenient in raw material source, convenient to operate, low in cost and good in application prospect.
Description
Technical field
the present invention relates to a kind of preparation method of the short fiber reinforced silicon carbide ceramics containing silicon-dioxide, belong to technical field of ceramic production.
Background technology
Silicon carbide ceramics obtains applying more and more widely because it has excellent hot strength, wear-corrosion resistance and heat-shock resistance.Silicon carbide ceramics plays more and more important effect at Material Field.Therefore, in the urgent need to further studying in carbofrax material, so that while improving constantly its premium properties, reducing production cost, simplifying production technique, promote the production of silicon carbide ceramics product.Carborundum refractory has that hot strength is high, thermal conductivity good, good corrosion resistance etc. feature, very extensive in industrial aspect purposes such as potteries.Owing to being subject to the restriction of preparation and fabrication technology, the development of ceramic fast-firing technique cannot be broken through, and the pottery of traditional clayey, High-Alumina and clay-carborundum cannot meet market demands.The silicon-dioxide that the present invention adds not only increases the thermostability of silicon carbide ceramics, also there is high intensity, preferably erosion resistance, high thermal conductivity etc., introduce the mechanical property that chopped carbon fiber improves silicon carbide, improve the fracture toughness property of material, improve intensity and the density of biscuit, suppress the generation of various defect in biscuit preparation, meeting machining needs, is a kind of comparatively ideal refractory materials.
Summary of the invention
The object of this invention is to provide a kind of preparation method of the short fiber reinforced silicon carbide ceramics containing silicon-dioxide.
In order to realize object of the present invention, the present invention is by following scheme implementation:
A preparation method for short fiber reinforced silicon carbide ceramics containing silicon-dioxide, is made up of the raw material of following weight part: silicon carbide 60-80, chopped carbon fiber predispersion 10-15, sintering aid 3-4, abrasive silica 8-12, iridium black 2-3, albite in powder 4-6, mullite powder 4-6, dehydrated alcohol 20-25, POLYPROPYLENE GLYCOL 2-3, deionized water 70-80;
Described sintering aid becomes 200-300 order powder by the zirconium boride 99.5004323A8ure of the aluminum oxide of 10-15 weight part, 8-12 weight part, the carbon dust mixed grinding of 15-20 weight part, add the methylene-bisacrylamide of 0.4-0.8 weight part and the ethanolic soln mixing and stirring of 10-15 weight part, heating boils off solvent and be pressed into stock under 10-15MPa, then under 600-800 ° of C, is dried and crushed into 150-200 order powder.
The preparation method of chopped carbon fiber predispersion of the present invention is: be cut to length at 1-3mm by short for carbon fiber, low-temperature oxidation 1-2 hour under 500-600 ° of C, being immersed volume ratio is again in the dust technology of 3:7 and the mixing solutions of acetone, soak after 1-2 days and repeatedly rinse surface with deionized water until solution is in neutral, sol-gel method is adopted to form zirconia coating at carbon fiber surface after drying, again this carbon fiber is immersed in the water completely, ultrasonic wave dispersion 10-20 minute, add the OP-10 emulsifying agent of carbon fiber 0.3-0.5 times weight part again, continue ultrasonic disperse 1-2 hour.
The preparation method of a kind of short fiber reinforced silicon carbide ceramics containing silicon-dioxide of the present invention, is made up of following concrete steps:
(1) mixing of silicon carbide, abrasive silica, iridium black and deionized water is added in ball grinder, with high-purity alpha-alumina abrading-ball ball milling 2-3 hour, add all the other remaining compositions except chopped carbon fiber predispersion again and carry out wet-mixed with the rotating speed of 300-400 rev/min, mixing 1-2 hour;
(2) chopped carbon fiber predispersion is added in step (1), rotating speed is reduced to 100-200 rev/min, continue ball milling 1-2 hour, the slurry mixed at room temperature is bled and is slowly added in metal die, then be placed in insulation can under 80 ° of C, be incubated 30-50 minute after the demoulding, at room temperature seasoning no longer reduces to weight;
(3) inserted in reaction sintering stove by the ceramics biscuits of carbonized bricks that step (2) obtains, vacuumized by sintering oven, be warming up to 1600-1700 ° of C with 20-25 ° of C/min, constant temperature keeps 3-5 hour, and sample furnace cooling can obtain.
Advantage of the present invention is: the chopped carbon fiber that the present invention adds improves the mechanical property of silicon carbide, improve the fracture toughness property of pottery, improve intensity and the density of biscuit, meet machining needs, the silicon-dioxide added enhances the effects such as the thermostability of silicon carbide ceramics, intensity, erosion resistance and thermal conductivity, and raw material sources of the present invention are convenient, easy to operate, cost is low, application prospect is good.
specific embodiments
Below by specific examples, the present invention is described in detail.
A preparation method for short fiber reinforced silicon carbide ceramics containing silicon-dioxide, is made up of the raw material of following weight part (kilogram): silicon carbide 75, chopped carbon fiber predispersion 10, sintering aid 3, abrasive silica 12, iridium black 3, albite in powder 6, mullite powder 4, dehydrated alcohol 20, POLYPROPYLENE GLYCOL 3, deionized water 80;
Described sintering aid becomes 300 order powder by the zirconium boride 99.5004323A8ure of the aluminum oxide of 15 weight parts, 8 weight parts, the carbon dust mixed grinding of 18 weight parts, add the methylene-bisacrylamide of 0.6 weight part and the ethanolic soln mixing and stirring of 15 weight parts, heating boils off solvent and be pressed into stock under 12MPa, then under 700 ° of C, is dried and crushed into 200 order powder.
The preparation method of chopped carbon fiber predispersion of the present invention is: be cut to length at 3mm by short for carbon fiber, low-temperature oxidation 2 hours under 600 ° of C, being immersed volume ratio is again in the dust technology of 3:7 and the mixing solutions of acetone, soak after 1 day and repeatedly rinse surface with deionized water until solution is in neutral, sol-gel method is adopted to form zirconia coating at carbon fiber surface after drying, again this carbon fiber is immersed in the water completely, ultrasonic wave disperses 20 minutes, add the OP-10 emulsifying agent of carbon fiber 0.5 times of weight part again, continue ultrasonic disperse 2 hours.
The preparation method of a kind of short fiber reinforced silicon carbide ceramics containing silicon-dioxide of the present invention, is made up of following concrete steps:
(1) mixing of silicon carbide, abrasive silica, iridium black and deionized water is added in ball grinder, with high-purity alpha-alumina abrading-ball ball milling 3 hours, add all the other remaining compositions except chopped carbon fiber predispersion again and carry out wet-mixed with the rotating speed of 400 revs/min, mix 1 hour;
(2) chopped carbon fiber predispersion is added in step (1), rotating speed is reduced to 200 revs/min, continue ball milling 2 hours, the slurry mixed at room temperature is bled and is slowly added in metal die, then be placed in insulation can under 80 ° of C, be incubated 50 minutes after the demoulding, at room temperature seasoning no longer reduces to weight;
(3) inserted in reaction sintering stove by the ceramics biscuits of carbonized bricks that step (2) obtains, vacuumized by sintering oven, be warming up to 1700 ° of C with 20 ° of C/min, constant temperature keeps 4 hours, and sample furnace cooling can obtain.
In the present embodiment, the performance index result of pottery is as follows:
Hardness (GPa): 43.2;
Young's modulus (GPa): 410;
Folding strength (MPa): 230;
Fracture toughness property (Mpa/m
1/2): 4.22;
Thermal expansivity (10
-5/ K): 1.8;
Thermal conductivity (W/mK): 100.
Claims (3)
1. the preparation method of the short fiber reinforced silicon carbide ceramics containing silicon-dioxide, it is characterized in that, be made up of the raw material of following weight part: silicon carbide 60-80, chopped carbon fiber predispersion 10-15, sintering aid 3-4, abrasive silica 8-12, iridium black 2-3, albite in powder 4-6, mullite powder 4-6, dehydrated alcohol 20-25, POLYPROPYLENE GLYCOL 2-3, deionized water 70-80;
Described sintering aid becomes 200-300 order powder by the zirconium boride 99.5004323A8ure of the aluminum oxide of 10-15 weight part, 8-12 weight part, the carbon dust mixed grinding of 15-20 weight part, add the methylene-bisacrylamide of 0.4-0.8 weight part and the ethanolic soln mixing and stirring of 10-15 weight part, heating boils off solvent and be pressed into stock under 10-15MPa, then under 600-800 ° of C, is dried and crushed into 150-200 order powder.
2. the preparation method of a kind of short fiber reinforced silicon carbide ceramics containing silicon-dioxide according to claim 1, it is characterized in that, the preparation method of described chopped carbon fiber predispersion is: be cut to length at 1-3mm by short for carbon fiber, low-temperature oxidation 1-2 hour under 500-600 ° of C, being immersed volume ratio is again in the dust technology of 3:7 and the mixing solutions of acetone, soak after 1-2 days and repeatedly rinse surface with deionized water until solution is in neutral, sol-gel method is adopted to form zirconia coating at carbon fiber surface after drying, again this carbon fiber is immersed in the water completely, ultrasonic wave dispersion 10-20 minute, add the OP-10 emulsifying agent of carbon fiber 0.3-0.5 times weight part again, continue ultrasonic disperse 1-2 hour.
3. the preparation method of a kind of short fiber reinforced silicon carbide ceramics containing silicon-dioxide according to claim 1, is characterized in that, be made up of following concrete steps:
(1) mixing of silicon carbide, abrasive silica, iridium black and deionized water is added in ball grinder, with high-purity alpha-alumina abrading-ball ball milling 2-3 hour, add all the other remaining compositions except chopped carbon fiber predispersion again and carry out wet-mixed with the rotating speed of 300-400 rev/min, mixing 1-2 hour;
(2) chopped carbon fiber predispersion is added in step (1), rotating speed is reduced to 100-200 rev/min, continue ball milling 1-2 hour, the slurry mixed at room temperature is bled and is slowly added in metal die, then be placed in insulation can under 80 ° of C, be incubated 30-50 minute after the demoulding, at room temperature seasoning no longer reduces to weight;
(3) inserted in reaction sintering stove by the ceramics biscuits of carbonized bricks that step (2) obtains, vacuumized by sintering oven, be warming up to 1600-1700 ° of C with 20-25 ° of C/min, constant temperature keeps 3-5 hour, and sample furnace cooling can obtain.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108164278A (en) * | 2018-01-12 | 2018-06-15 | 南京膜材料产业技术研究院有限公司 | A kind of high gas permeability carborundum porous ceramics material and preparation method thereof |
| CN111718180A (en) * | 2020-07-01 | 2020-09-29 | 北京玻钢院复合材料有限公司 | Chopped carbon fiber reinforced aluminum silicate ceramic matrix composite and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101560104A (en) * | 2009-05-12 | 2009-10-21 | 宁波欧翔精细陶瓷技术有限公司 | Preparation method for silicon carbide ceramic tube or rod |
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2015
- 2015-04-20 CN CN201510184644.5A patent/CN104876614A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101560104A (en) * | 2009-05-12 | 2009-10-21 | 宁波欧翔精细陶瓷技术有限公司 | Preparation method for silicon carbide ceramic tube or rod |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108164278A (en) * | 2018-01-12 | 2018-06-15 | 南京膜材料产业技术研究院有限公司 | A kind of high gas permeability carborundum porous ceramics material and preparation method thereof |
| WO2019136828A1 (en) * | 2018-01-12 | 2019-07-18 | 南京膜材料产业技术研究院有限公司 | Silicon carbide porous ceramic material having high gas permeability, and preparation method thereof |
| CN111718180A (en) * | 2020-07-01 | 2020-09-29 | 北京玻钢院复合材料有限公司 | Chopped carbon fiber reinforced aluminum silicate ceramic matrix composite and preparation method thereof |
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