CN101054310A - Carbon fiber enhanced porous normal pressure sintering silicon carbide and preparation method thereof - Google Patents
Carbon fiber enhanced porous normal pressure sintering silicon carbide and preparation method thereof Download PDFInfo
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Abstract
The present invention discloses a carbon fibers reinforcing porous ambient-pressure sintering silicon carbide prepared from the following raw materials with certain mass ratio: SiC fine powder: boron powder: carbon black: phenolic resin: methanol = 100: 0.3-3: 1-5: 5-10: 120, wherein 2-20 volume % micropores with size of 5-200 micron and 2-25 volume % carbon fibers are formed iside the finished products. The manufacturing method comprises the following steps: adopting silicon carbide fine powder as a base material, boron powder and carbon black as sintering agent, phenolic resin as adhesive, methanol as solvent, mixing them to plasm material, adding carbon fibers thereto and mixing them, mixing paraffin pore-forming agent therein uniformly after drying them, dry pressing or isostatic press Mmoulding, and then sintering them at ambient pressure to form the product. Said carbon fibers reinforcing porous ambient-pressure sintering silicon carbide can improve remarkablyb the lubrication performances and the dry friction enduring abilities of ambient-pressure sintering silicon carbide materials and enable the materaials to maintain very strong mechanical performances.
Description
Technical field
The present invention relates to a kind of engineering ceramic material and preparation method thereof in the technical field of ceramic material, specifically is a kind of carbon fiber enhanced porous normal pressure sintering silicon carbide and preparation method thereof.
Background technology
Because therefore the constant pressure sintering silicon carbide material has high-strength, high hard, the high temperature resistant and outstanding properties of anti-all chemical mediators almost, has been widely used in fields such as aerospace, nuclear power, petrochemical complex, automobile, boats and ships, metallurgy.In order further to enlarge its range of application in high-parameters, heavy loading operating mode and various sophisticated technologies field, various personalizations, the new modified material of functional type constant pressure sintering silicon carbide and matrix material become the particularly American-European expert's of developed country in countries in the world focus and research and development emphasis again.
The U.S. and Germany are as the power of research of modern project stupalith and application, all successively succeed in developing porous normal pressure sintering silicon carbide material and carbon adding type constant pressure sintering silicon carbide material respectively, be mainly used in making mechanical seal friction and pay and ceramic bearing, its objective is the attriting performance that improves material.But two kinds of materials are subjected to the restriction of the action condition of anti-attrition effect separately and cause the decline of the mechanical property of materials to fetter the lifting of its using value because of the existence in hole and the adding of carbon granule respectively:
The porous normal pressure sintering silicon carbide material: its principle of work is that when fluid was sufficient between the fastness, micropore was regulated the liquid film that rubs between paying by the hydrodynamic effect, thereby reduced coefficient of friction, the power consumption of reducing friction; When fluid is inadequate, then hold liquid improved effect lubricating condition by micropore.Its defective is, if the 1 friction work of paying lacks liquid at the very start, that is to say, still do not hold at micropore under the situation of liquid and dry grinds, and material will lose the anti-attrition effect so; 2, the micropore starting point of stupalith crackle often, mechanical property defective easily produce at the micropore place, expansion, finally cause material damage, so the existence of micropore will certainly cause the decline of stupalith mechanical property.
Carbon adding type constant pressure sintering silicon carbide material: its principle of work is to utilize the self-lubricating property of carbon graphite to improve the ability that the constant pressure sintering silicon carbide material bears dry friction; When being in the border friction, a friction pair working order then can play the reduction coefficient of friction, the effect that reduces wear.Its defective is, though 1, carbon graphite belongs to the solid antifriction material, when fluid between the fastness was sufficient, the carbon graphite particle in the carbon adding type constant pressure sintering silicon carbide material was but inoperative basically; 2, the intensity of carbon graphite particle own is lower, and easily forms weak the boundary behind the carbon adding type constant pressure sintering silicon carbide sintering between carbon graphite particle and the silicon carbide substrate, becomes the area of origin of defective, so the mechanical property of material obviously reduces.
Summary of the invention
The technical problem to be solved in the present invention is, overcome the defective of above prior art, provide a kind of and can significantly improve the lubricity of constant pressure sintering silicon carbide material and bear the ability of metal to-metal contact, and make the carbon fiber enhanced porous normal pressure sintering silicon carbide of the very strong mechanical property of constant pressure sintering silicon carbide material maintenance.
Another technical problem that the present invention will solve is that a kind of preparation method of carbon fiber enhanced porous normal pressure sintering silicon carbide is provided.
Technical scheme of the present invention is, a kind of carbon fiber enhanced porous normal pressure sintering silicon carbide is provided, it is made by the starting material of following mass ratio: the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is 100: 0.3～3: 1～5: 5～10: 120, and be 2%～20% micropore and to contain volume content be 2%～25% carbon fiber at the inner volume content that forms of (material) finished product, the size of described micropore is 5～200 microns.
Described raw-material mass ratio is preferably: the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is 100: 1～2: 2～3.5: 6.5～8.5: 120, and be 6%～15% micropore and to contain volume content be 6%～15% carbon fiber at the inner volume content that forms of finished product, the size of described micropore is 30～130 microns.
The diameter that described SIC micro mist is a silicon carbide micro-powder is preferably less than 0.68 micron, and purity is preferably greater than 99%.
Another technical scheme of the present invention is, a kind of preparation method of carbon fiber enhanced porous normal pressure sintering silicon carbide is provided, with the silicon carbide micro-powder is base-material, is agglutinant with boron powder, carbon black, and resol is caking agent, methyl alcohol is solvent, blend together slurry, add carbon fiber again and stir, oven dry back mixing paraffin pore-forming material, dry-pressing or isostatic pressing, normal pressure-sintered; Its concrete processing step is as follows:
1), by the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is that 100: 0.3～3: 1～5: 5～10: 120 mass ratio is mixed into slurry;
2), adding volume content in slurry is 2%～25% carbon fiber and stirs;
3), with step 2) slurry oven dry back and volume content be 2%～20% the paraffin pore-forming material acquisition powder mix that stirs;
4), dry-pressing or isostatic pressing, pressure is 80～200MPa, pressurize 2～20 seconds;
5), 2010～2200 ℃ normal pressure-sintered, obtain the carbon fiber enhanced porous normal pressure sintering silicon carbide material: stove internal gas pressure 200～800mbar; Temperature rise rate: normal temperature to 600 ℃: 100～200 ℃/hour; 600～1000 ℃: 300～400 ℃/hour; 1000～1900 ℃: 400～500 ℃/hour; 1900～2000 ℃: 200 ℃/hour; More than 2000 degree: 100 ℃/hour; Be incubated 30～60 minutes at last.
Preferred following processing parameter and the concrete processing step of adopting:
1), by the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is that 100: 1～2: 2～3.5: 6.5～8.5: 120 mass ratio is mixed into slurry;
2), adding volume content in slurry is 6%～15% carbon fiber and stirs;
3), with step 2) slurry oven dry back and volume content be 6%～15% paraffin pore-forming material acquisition powder mix that stirs;
4), dry-pressing or isostatic pressing, pressure is 120～140MPa, pressurize 10～15 seconds;
5), at normal pressure and 2030～2060 ℃ of sintering temperatures, obtain the carbon fiber enhanced porous normal pressure sintering silicon carbide material: stove internal gas pressure 200～300mbar; Temperature rise rate: normal temperature to 600 ℃: 100 ℃/hour; 600～1000 ℃: 300 ℃/hour; 1000～1900 ℃: 400 ℃/hour; 1900～2000 ℃: 200 ℃/hour; More than 2000 ℃: 100 ℃/hour; Be incubated 50～60 minutes at last.
The length-to-diameter ratio of described carbon fiber is preferably 25: 1.
The paraffin particles scope of described paraffin pore-forming material is preferably 5～200 microns; More preferably 30～130 microns of the paraffin particles scopes of described paraffin pore-forming material.
Above-mentioned steps 1) mixing in can be adopted the ball milling mixing machine, and using diameter is the SIC abrading-ball of 5～15mm, rotating speed 50～120rpm, mixing time 30～50 hours.
Above-mentioned steps 2) stirring in can be adopted the ultrasonic stirring machine, and rotating speed is 100～300rpm, and churning time is 3～6 hours.
The mass ratio of above-mentioned raw materials draws through repetition test repeatedly, experimental results show that too much or very few boron powder all is unfavorable for the material densified sintering product; And oxygen part content of the ratio of carbon black and raw material is relevant, and feed oxygen part content height then needs more carbon black, otherwise can reduce the addition of carbon black; Resol is mainly used in the processability of improving material, if measure very fewly, compound is difficult to compression moulding, and biscuit lacks intensity, and if amount too much, then can cause mold sticking, cause the moulding problem equally.Carbon fiber adds very few, can't form enough anti-attrition effect and strengthening effect, but the carbon fiber adding too much, then can make the fundamental property of novel material forfeiture silicon carbide ceramics, so the carbon fiber add-on is controlled between 2%～25%.Pore-forming material adds very few, can't form enough micropores in the material, be difficult to reach ideal anti-attrition effect, if but too much, then can reduce the mechanical property of material or make novel material resistance leakage bearing capacity low excessively, so micro pore volume content is controlled between 2%～20%.
Carbon fiber to carbon fiber enhanced porous normal pressure sintering silicon carbide material enhanced mechanism is among the present invention: a, fiber are transferred to and are strengthened: when fiber is extracted from matrix under extraneous load effect, because of interface friction consumes a part of extraneous load energy, thereby reach the enhancing purpose, its reinforced effects is subjected to the influence of fiber and interface sliding resistance; B, fiber bridge joint strengthen: when matrix ruptured, fiber can bear extraneous load and play the bridge ligation between the crack surface that disconnects, and the fiber of bridge joint can produce the power that makes crack closure to matrix, consumed extraneous load acting, thereby improved toughness of material.
Carbon fiber enhanced porous normal pressure sintering silicon carbide of the present invention and preparation method thereof is compared with above prior art, has following remarkable advantage and beneficial effect:
Carbon fiber enhanced porous normal pressure sintering silicon carbide of the present invention forms micropore simultaneously and adds carbon fiber in the constant pressure sintering silicon carbide material, hold surge pressure anti-attrition effect and carbon graphite solid lubrication effect by micropore, make novel material of the present invention no matter under the operating mode of " start and lack liquid ", " process cutout " or " fluid is abundant ", all can play the good wear effect.The simple microporous type and of the dependence of simple carbon adding type material of above-mentioned prior art have been overcome to working condition.
Carbon fiber enhanced porous normal pressure sintering silicon carbide of the present invention replaces carbon granule to improve the intensity of material with carbon fiber, avoid the damage of the importing of carbon granule to the mechanical property of materials, remedy the negative impact that micropore brings, thereby the over-all properties of novel material of the present invention is improved, promote the using value of material, expanded the application space.
Carbon fiber enhanced porous normal pressure sintering silicon carbide of the present invention holds to surge by carbon graphite solid lubrication anti-attrition and micropore presses the dual anti-attrition effect of anti-attrition, has significantly improved the lubricity and the ability of bearing metal to-metal contact of constant pressure sintering silicon carbide material.The reinforced effects that produces because of carbon fiber makes novel material of the present invention can keep very strong mechanical property simultaneously.
Description of drawings
Fig. 1 is the metallograph of carbon fiber enhanced porous normal pressure sintering silicon carbide of the present invention.
Fig. 2 is the friction resistance comparison test result schematic diagram of the porous normal pressure sintering silicon carbide material and the carbon adding type constant pressure sintering silicon carbide material of carbon fiber enhanced porous normal pressure sintering silicon carbide of the present invention and prior art.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, but the present invention not only is confined to following examples.
Embodiment 1:
Prepare by following concrete processing step:
1), by the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is 100: 0.4: 4.5: 5.5: 120 mass ratio is mixed into slurry; The employing diameter is 0.62 micron a SIC micro mist.Adopt the ball milling mixing machine to mix, using diameter is the SIC abrading-ball of 5～15mm, and rotating speed adopts 60rpm, and mixing time is 40 hours.
2), in slurry, add volume content and be 2% carbon fiber and stir that the length-to-diameter ratio of carbon fiber is 25: 1, adopt the ultrasonic stirring machine, rotating speed adopts 150rpm, churning time is 3 hours.
3), with step 2) slurry oven dry back and volume content be that the acquisition powder mix stirs for 2% paraffin pore-forming material (the paraffin particles scope is 5～50 microns).
4), under 120MPa pressure isostatic pressing (as the external diameter * internal diameter of finished product * highly: 150mm * 90mm * 280mm, following examples are identical), pressurize 10 seconds.
5), at normal pressure and 2020 ℃ of sintering temperatures, stove internal gas pressure 200～300mbar; Temperature rise rate: normal temperature to 600 ℃: 100 ℃/hour; 600～1000 ℃: 300 ℃/hour; 1000～1900 ℃: 400 ℃/hour; 1900～2000 degree: 200 ℃/hour; More than 200 ℃: 100 ℃/hour; Be incubated 50 minutes at last, promptly obtain the carbon fiber enhanced porous normal pressure sintering silicon carbide material of 2% carbon fiber volume content and 2% micro pore volume content, in other words, be 2% micropore and to contain volume content be 2% carbon fiber (following examples meaning all with, be concrete degree difference) promptly at the inner volume content that forms of carbon fiber enhanced porous normal pressure sintering silicon carbide material finished product.The size distribution scope of described micropore is 5～50 microns.
Embodiment 2:
Prepare by following concrete processing step:
1), by the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is 100: 2.9: 1.5: 10: 120 mass ratio is mixed into slurry; The employing diameter is 0.52 micron a SIC micro mist.Adopt the ball milling mixing machine to mix, using diameter is the SIC abrading-ball of 5～15mm, and rotating speed adopts 60rpm, and mixing time is 40 hours.
2), in slurry, add volume content and be 25% carbon fiber and stir that the length-to-diameter ratio of carbon fiber is 25: 1, adopt the ultrasonic stirring machine, rotating speed adopts 300rpm, churning time is 6 hours.
3), with step 2) slurry oven dry back and volume content be that 20% paraffin pore-forming material (the paraffin particles scope is 100～200 microns) stirs, obtain powder mix.
4), under 160MPa pressure isostatic pressing, pressurize 20 seconds.
5), at normal pressure and 2080 ℃ of sintering temperatures, stove internal gas pressure 200～300mbar; Temperature rise rate: normal temperature to 600 ℃: 100 ℃/hour; 600～1000 ℃: 300 ℃/hour; 1000～1900 ℃: 400 ℃/hour; 1900～2000 ℃: 200 ℃/hour; More than 2000 ℃: 100 ℃/hour; Be incubated 60 minutes at last, promptly obtain the carbon fiber enhanced porous normal pressure sintering silicon carbide material of 25% carbon fiber volume content and 20% micro pore volume content, the size distribution scope of described micropore is 100～200 microns.
Embodiment 3:
Prepare by following concrete processing step:
1), by the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is 100: 1: 3.5: 6.5: 120 mass ratio is mixed into slurry; The employing diameter is 0.62 micron a SIC micro mist.Adopt the ball milling mixing machine to mix, using diameter is the SIC abrading-ball of 5～15mm, and rotating speed adopts 60rpm, and mixing time is 40 hours.
2), in slurry, add volume content and be 6% carbon fiber and stir that the length-to-diameter ratio of carbon fiber is 25: 1, adopt the ultrasonic stirring machine, rotating speed adopts 150rpm, churning time is 3 hours.
3), with step 2) slurry oven dry back and volume content be that 6% paraffin pore-forming material (the paraffin particles scope is 30～80 microns) stirs, obtain powder mix.
4), under 120MPa pressure isostatic pressing, pressurize 10 seconds.
5), at normal pressure and 2030 ℃ of sintering temperatures, stove internal gas pressure 200～300mbar; Temperature rise rate: normal temperature to 600 ℃: 100 ℃/hour; 600～1000 ℃: 300 ℃/hour; 1000～1900 ℃: 400 ℃/hour; 1900～2000 ℃: 200 ℃/hour; More than 2000 ℃: 100 ℃/hour; Be incubated 50 minutes at last, promptly obtain the carbon fiber enhanced porous normal pressure sintering silicon carbide material of 6% carbon fiber volume content and 6% micro pore volume content, the size distribution scope of described micropore is 30～80 microns.
Embodiment 4:
Prepare by following concrete processing step:
1), by the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is 100: 1.6: 2.5: 7.5: 120 mass ratio is mixed into slurry; The employing diameter is 0.62 micron a SIC micro mist.Adopt the ball milling mixing machine to mix, using diameter is the SIC abrading-ball of 5～15mm, and rotating speed adopts 60rpm, and mixing time is 40 hours.
2), in slurry, add volume content and be 10% carbon fiber and stir that the length-to-diameter ratio of carbon fiber is 25: 1, adopt the ultrasonic stirring machine, rotating speed adopts 200rpm, churning time is 4 hours.
3), with step 2) slurry oven dry back and volume content be that 10% paraffin pore-forming material (50～100 microns of paraffin particles scopes) stirs, obtain powder mix.
4), under 140MPa pressure isostatic pressing, pressurize 15 seconds.
5), at normal pressure and 2050 ℃ of sintering temperatures, stove internal gas pressure 200～300mbar; Temperature rise rate: normal temperature to 600 ℃: 100 ℃/hour; 600～1000 ℃: 300 ℃/hour; 1000～1900 ℃: 400 ℃/hour; 1900～2000 ℃: 200 ℃/hour; More than 2000 ℃: 100 ℃/hour; Be incubated 60 minutes at last, promptly obtain the carbon fiber enhanced porous normal pressure sintering silicon carbide material of 10% carbon fiber volume content and 10% micro pore volume content, the size distribution scope of described micropore is 50～100 microns.
Embodiment 5:
Prepare by following concrete processing step:
1), by the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is 100: 2.0: 2: 8.5: 120 mass ratio is mixed into slurry; The employing diameter is 0.52 micron a SIC micro mist.Adopt the ball milling mixing machine to mix, using diameter is the SIC abrading-ball of 5～15mm, and rotating speed adopts 60rpm, and mixing time is 40 hours.
2), in slurry, add volume content and be 15% carbon fiber and stir that the length-to-diameter ratio of carbon fiber is 25: 1, adopt the ultrasonic stirring machine, rotating speed adopts 200rpm, churning time is 4 hours.
3), with step 2) slurry oven dry back and volume content be that the acquisition powder mix stirs for 15% paraffin pore-forming material (80～130 microns of paraffin particles scopes).
4), under 140MPa pressure isostatic pressing, pressurize 15 seconds.
5), at normal pressure and 2060 ℃ of sintering temperatures, stove internal gas pressure 200～300mbar; Temperature rise rate: normal temperature to 600 ℃: 100 ℃/hour; 600～1000 ℃: 300 ℃/hour; 1000～1900 ℃: 400 ℃/hour; 1900～2000 ℃: 200 ℃/hour; More than 2000 ℃, 100 ℃/hour; Be incubated 60 minutes at last, promptly obtain the carbon fiber enhanced porous normal pressure sintering silicon carbide material of 15% carbon fiber volume content and 15% micro pore volume content, the size distribution scope of described micropore is 80～130 microns.
In Fig. 1, strip is a carbon fiber, and stain is a micropore.As can be seen from the figure carbon fiber and micropore are evenly distributed in the silicon carbide substrate, have formed the distinctive microtexture of carbon fiber enhanced porous normal pressure sintering silicon carbide material.
Following testing data has proved that further the present invention has above-mentioned remarkable advantage and beneficial effect:
Learn from the porous normal pressure sintering silicon carbide material of carbon fiber enhanced porous normal pressure sintering silicon carbide of the present invention shown in Figure 2 and prior art and the friction resistance comparison test result schematic diagram of carbon adding type constant pressure sintering silicon carbide material:
Starting and low-speed stage, liquid film between friction is paid is not fully set up, the anti-attrition effect mainly from the solid lubrication effect of carbon graphite material, thereby from the testing data curve frictional resistance of the carbon adding type material of prior art is lower than the porous material of prior art as can be seen.That is to say starting and low-speed stage that the anti-attrition performance of carbon adding type material is better than porous material.
Raising along with test speed, liquid film between friction is paid is able to abundant formation, micropore held to surge and pressed the anti-attrition effect to begin to play a role this moment, thus from the testing data curve as can be seen the frictional resistance of porous material drop gradually, the frictional resistance of carbon adding type material then obviously strengthens.That is to say raising along with speed, the formation of liquid film, the anti-attrition performance of porous material is better than carbon adding type material conversely.
Hold the dual anti-attrition effect of pressure anti-attrition of surging from testing data curve carbon fiber enhanced porous normal pressure sintering silicon carbide novel material obviously of the present invention as can be seen owing to possessing carbon graphite solid lubrication anti-attrition and micropore, make it no matter under the situation of " lacking liquid " or " fluid is abundant ", no matter in the stage of " startup low speed " or " running up ", all can bring into play the good wear effect.
In addition, strength of materials evidence the present invention that the present invention did is had very strong mechanical property: the intensity of the porous material of prior art significantly reduces along with the raising of micro content, test shows that micro pore volume content is 2%～20% porous material, and its flexural strength changes between 120～350MPa.And the present invention strengthens by adding carbon fiber, and the flexural strength increase rate of material can reach 30%～120%, and (the material sample dimensions is 3 * 4 * 36mm, testing installation: the ceramics strength trier).
Claims (8)
1, a kind of carbon fiber enhanced porous normal pressure sintering silicon carbide, it is characterized in that, it is made by the starting material of following mass ratio: the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is 100: 0.3～3: 1～5: 5～10: 120, and be 2%～20% micropore and to contain volume content be 2%～25% carbon fiber at the inner volume content that forms of finished product, the size of described micropore is 5～200 microns.
2, carbon fiber enhanced porous normal pressure sintering silicon carbide according to claim 1, it is characterized in that, described raw-material mass ratio is: the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is 100: 1～2: 2～3.5: 6.5～8.5: 120, and be 6%～15% micropore and to contain volume content be 6%～15% carbon fiber at the inner volume content that forms of finished product, the size of described micropore is 30～130 microns.
3, carbon fiber enhanced porous normal pressure sintering silicon carbide according to claim 1 and 2 is characterized in that, the diameter of described SIC micro mist is less than 0.68 micron, and purity is greater than 99%.
4, a kind of preparation method of carbon fiber enhanced porous normal pressure sintering silicon carbide, it is characterized in that, with the silicon carbide micro-powder is base-material, is agglutinant with boron powder, carbon black, and resol is caking agent, methyl alcohol is solvent, blend together slurry, add carbon fiber again and stir, oven dry back mixing paraffin pore-forming material, dry-pressing or isostatic pressing, normal pressure-sintered; Its concrete processing step is as follows:
1), by the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is that 100: 0.3～3: 1～5: 5～10: 120 mass ratio is mixed into slurry;
2), adding volume content in slurry is 2%～25% carbon fiber and stirs;
3), with step 2) slurry oven dry back and volume content be that 2%～20% paraffin pore-forming material stirs, obtain powder mix;
4), dry-pressing or isostatic pressing, pressure is 80～200MPa, pressurize 2～20 seconds;
5), at normal pressure and 2010～2200 ℃ of sintering temperatures, obtain the carbon fiber enhanced porous normal pressure sintering silicon carbide material: stove internal gas pressure 200～800mbar; Temperature rise rate: normal temperature to 600 ℃: 100～200 ℃/hour; 600～1000 ℃: 300～400 ℃/hour; 1000～1900 ℃: 400～500 ℃/hour; 1900～2000 ℃: 200 ℃/hour; More than 2000 ℃: 100 ℃/hour; Be incubated 30～60 minutes at last.
5, the preparation method of carbon fiber enhanced porous normal pressure sintering silicon carbide according to claim 4 is characterized in that, adopts following processing parameter and concrete processing step:
1), by the SIC micro mist: boron powder: carbon black: resol: methyl alcohol is that 100: 1～2: 2～3.5: 6.5～8.5: 120 mass ratio is mixed into slurry;
2), adding volume content in slurry is 6%～15% carbon fiber and stirs;
3), with step 2) slurry oven dry back and volume content be that 6%～15% paraffin pore-forming material stirs, obtain powder mix;
4), dry-pressing or isostatic pressing, pressure is 120～140MPa, pressurize 10～15 seconds;
5), at normal pressure and 2030～2060 ℃ of sintering temperatures, obtain the carbon fiber enhanced porous normal pressure sintering silicon carbide material: stove internal gas pressure 200～300mbar; Temperature rise rate: normal temperature to 600 ℃: 100 ℃/hour; 600～1000 ℃: 300 ℃/hour; 1000～1900 ℃: 400 ℃/hour; 1900～2000 ℃: 200 ℃/hour; More than 2000 ℃: 100 ℃/hour; Be incubated 50～60 minutes at last.
According to the preparation method of claim 4 or 5 described carbon fiber enhanced porous normal pressure sintering silicon carbides, it is characterized in that 6, the length-to-diameter ratio of described carbon fiber is 25: 1.
7, according to the preparation method of claim 4 or 5 described carbon fiber enhanced porous normal pressure sintering silicon carbides, it is characterized in that 5～200 microns of the paraffin particles scopes of described paraffin pore-forming material.
8, the preparation method of carbon fiber enhanced porous normal pressure sintering silicon carbide according to claim 7 is characterized in that, 30～130 microns of the paraffin particles scopes of described paraffin pore-forming material.
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| CN110746193A (en) * | 2019-10-16 | 2020-02-04 | 上海德宝密封件有限公司 | Carbon fiber reinforced normal-pressure sintered silicon carbide |
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| CN112624764A (en) * | 2020-12-30 | 2021-04-09 | 巴中意科碳素股份有限公司 | Method for preventing isostatic pressing graphite from sintering and cracking |
| CN112624764B (en) * | 2020-12-30 | 2022-07-29 | 巴中意科碳素股份有限公司 | Method for preventing isostatic pressing graphite from sintering and cracking |
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| CN101054310B (en) | 2010-05-26 |
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