WO2003014042A1 - Materiau structural poreux super-leger et resistant a la chaleur a base de carbure de silicium - Google Patents
Materiau structural poreux super-leger et resistant a la chaleur a base de carbure de silicium Download PDFInfo
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- WO2003014042A1 WO2003014042A1 PCT/JP2002/007950 JP0207950W WO03014042A1 WO 2003014042 A1 WO2003014042 A1 WO 2003014042A1 JP 0207950 W JP0207950 W JP 0207950W WO 03014042 A1 WO03014042 A1 WO 03014042A1
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- silicon
- silicon carbide
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Definitions
- the present invention uses a two-step reaction sintering method in which silicon is melted and impregnated after reaction sintering of silicon and carbon, and is an ultralight silicon carbide heat-resistant porous material that maintains a sponge-like continuous porous shape.
- the present invention relates to structural materials and methods for manufacturing the same, and more specifically, to high-temperature filters, high-temperature structural members, heat insulating materials, molten metal filter materials, burner plates, heater materials, high-temperature sound-absorbing materials, etc.
- the present invention relates to a heat-resistant ultra-lightweight porous structural material suitable for use and a method for producing the same. Background art
- Silicon carbide ceramics are lightweight and have excellent heat resistance, abrasion resistance, and corrosion resistance. For example, in recent years, for example, high-temperature corrosion-resistant materials, heater materials, wear-resistant materials, and even grinding materials and grinding wheels Widely used for such applications. Since this silicon carbide ceramics is mainly manufactured by sintering technology, it has not yet been put to practical use as an ultralight porous material having a filter shape with a porosity of 90% or more.
- the above method uses a slurry of silicon carbide powder, even when the excess slurry is removed, the excess slurry remains and the pores are sometimes blocked.
- the porosity is as low as about 85%, and the apparent specific gravity is as high as about 0.42.
- the pore size is about 1 to 5 mm (standard cell number: 13 cells // 25 mm to 6 cells / mm).
- the present inventors have found that a dense amorphous carbon-only matrix formed by carbonization of phenol resin hardly reacts with molten silicon, but a mixture of silicon powder and phenol resin.
- the present invention overcomes various drawbacks of the conventional silicon carbide-based heat-resistant and lightweight porous material and its manufacturing method, and provides a porous structure having a shape as it is formed into a tangible skeleton.
- the present inventor impregnated a silicon powder and a resin into a tangible skeleton of a porous structure such as a sponge.
- a porous silicon carbide and a residual carbon portion are generated by a silicon carbide generation reaction accompanied by a volume reduction with the carbon from the above structure, and the porous skeleton portion is melt-impregnated with silicon.
- Completed the present invention by finding that a silicon carbide-based heat-resistant ultra-lightweight porous structural material can be easily manufactured while maintaining the shape of the tangible skeleton of the porous structure even if it has a complicated shape. I came to.
- the silicon carbide-based heat-resistant ultra-lightweight porous structural material of the present invention completed as described above contains molten silicon and silicon carbide having good wettability, and at the same time, carbon having open pores caused by a volume reduction reaction.
- the carbonized porous structure sintered body is formed by melting and impregnating silicon into the carbonized porous structure sintered body, and the carbonized porous structure sintered body is formed into a plastic or paper sponge-like porous structure forming a tangible skeleton as a carbon source.
- Slurry containing resin and silicone powder in the range where the continuous pores of the porous structure are not blocked It is characterized in that it is formed by reaction sintering of a carbonized porous structure which has been impregnated and carbonized.
- the method for producing a silicon carbide-based heat-resistant ultralight porous structure material of the present invention basically comprises adding a resin as a carbon source and silicon powder to a tangible skeleton of a sponge-like porous structure.
- the impregnated slurry is impregnated within a range that does not block the continuous pores of the porous structure, and then carbonized at 900 to 130 ° C in a vacuum or an inert atmosphere.
- By reacting and sintering the porous structure at a temperature of 132 ° C. or more in a vacuum or an inert atmosphere it is possible to form silicon carbide with high wettability with molten silicon and at the same time to increase the volume. Open pores due to the reduction reaction are generated, and the porous structure is melt-impregnated with silicon at a temperature of 130 to 180 ° C in a vacuum or an inert atmosphere. This is a special floor.
- reaction sintering treatment of silicon and carbon and the melt impregnation of silicon may be performed by the same heat treatment, or all the heat treatments including carbonization may be performed by the same heat treatment.
- a large-sized structure having a complicated shape can be easily manufactured, and the processing of the porous structure can be easily performed if the carbonization is performed.
- the tangible skeleton of the porous structure is impregnated with the slurry containing the resin and the silicon powder. After that, it is effective to squeeze the slurry.
- squeezing the slurry not only squeezing by compression but also squeezing means utilizing centrifugal force or the like can be used.
- the material constituting the tangible skeleton of the sponge-like porous structure used in the above method is desirably a porous structure capable of holding slurry, and the material constituting the porous structure is a resin or rubber sponge. Or, a sponge-shaped plastic or paper is suitable.
- a phenol resin, a furan resin, an organometallic polymer such as polycarbosilane, or sucrose is preferable. This These resins may be used alone or in combination of two or more.
- carbon powder, graphite powder, and carbon black are added as additives, or silicon carbide, silicon nitride, zirconia, zircon, alumina, silica, mullite, and nickel as aggregates or antioxidants. Molybdenum fluoride, boron carbide, boron powder, etc. may be added.
- the silicon powder contained in the slurry used in the above method is selected from magnesium, aluminum, titanium, chromium, manganese, iron, konolenot, nickel, copper, zinc, zirconium, diobium, molybdenum, or tungsten. Or at least one silicon alloy or a mixture of them and silicon powder.
- the silicon for melt impregnation may be pure silicon metal or magnesium, aluminum, titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, zirconium, diobium, molybdenum, tungsten, etc. It may be a silicon alloy or a mixture thereof with silicon.
- a resin serving as a carbon source and silicon powder are added to the tangible skeleton of the sponge-like porous structure.
- the impregnated slurry is impregnated within a range in which the continuous pores of the porous structure are not closed, and then reaction sintering is used to generate molten silicon, wettable silicon carbide, and open pores. Since the part is melt-impregnated with silicon, it is possible to easily produce a silicon carbide heat-resistant lightweight porous composite material that maintains the shape of the original porous structure as it is. It can be easily manufactured.
- a slurry obtained by mixing a phenol resin or the like as a dissolved carbon source and silicon powder is sufficiently applied to the tangible skeleton of the sponge-like porous structure, or the porous structure is added to the slurry.
- the slurry is squeezed to such an extent that the continuous pores are not blocked and dried. This drying is desirably performed at about 70 for about 12 hours.
- a sponge made of resin or rubber, or a sponge-shaped plastic or paper can be used for the porous structure as described above.
- the resin to be impregnated in the tangible skeleton of the porous structure at least one selected from phenol resin, furan resin, organometallic polymer and sucrose can be used. Agents and the like can be added.
- the silicon powder used for producing silicon carbide a fine powder is suitable, and particularly a fine powder having an average particle size of 30 m or less is suitable. Those having a large particle size may be ground by a ball mill or the like and finely ground.
- the porous structure thus obtained is carbonized at a temperature of about 900 to 1320 ° C. under an inert atmosphere such as vacuum or argon.
- the porous structure of the sponge is thermally decomposed and lost, and the skeleton portion is in a state where the carbon portion due to carbonization of the phenol resin and the silicon powder are mixed,
- the shape of the skeleton is the same as the original shape.
- the carbonized porous structure has a workable strength.
- the carbonized porous structure is baked at a temperature of 132 ° C. or higher in a vacuum or an inert atmosphere such as argon to cause a reaction between carbon and silicon, thereby causing wettability with molten silicon.
- a good porous silicon carbide is formed on the tangible backbone of the structure.
- this reaction is a volume reduction reaction, open pores are generated due to the volume reduction reaction.
- a porous structure sintered body formed of the matrix portion, porous silicon carbide and residual carbon is obtained.
- this porous structure sintered body is heated to a temperature of about 130 to 180 ° C. in a vacuum or in an inert atmosphere, and the porous silicon carbide and carbon part on the skeleton are heated.
- a silicon carbide heat-resistant ultralight porous material can be obtained.
- the mixing ratio of the phenol resin and the silicon powder is set so that the atomic ratio of carbon to silicon by carbonization of the phenol resin becomes 5: 3, and the slurry is prepared by dissolving the phenol resin with ethyl alcohol.
- this sponge was carbonized by firing at 100 ° C. for 1 hour in an argon atmosphere.
- the obtained carbonaceous porous material was simultaneously subjected to reaction sintering and silicon melt impregnation in a vacuum at 1450 ° C for 1 hour to obtain a sponge-shaped silicon carbide heat-resistant ultralight porous composite material.
- the sponge shrinks during carbonization and shrinks slightly by about 12% in the axial direction compared to before the carbonization.
- the obtained silicon carbide heat-resistant ultra-lightweight porous structural material has the same structure as a sponge, a pore diameter of 500 to 600111, an open porosity of 97%, and a density of 0.07 g / cm3. No collapsed pores were found.
- the mixing ratio of the phenol resin and the silicon powder is set so that the atomic ratio of carbon to silicon by carbonization of the phenol resin becomes 5: 3, and the slurry is prepared by dissolving the phenol resin with ethyl alcohol. Ball mill mixed for 1 day to reduce the particle size, impregnated them into a polyurethane sponge with pores of about 1 mm, compressed and squeezed so that the slurry liquid did not cover the continuous pores, and then dried I let it. At this time, the sponge expanded about 20 % in the axial direction.
- this sponge was carbonized by firing at 100 ° C. for 1 hour in an argon atmosphere.
- the obtained carbonaceous porous material was simultaneously subjected to reaction sintering and silicon melt impregnation in a vacuum at 1450 ° C for 1 hour to obtain a sponge-shaped silicon carbide heat-resistant ultralight porous composite material.
- the sponge shrinks during carbonization, compared to before A slight shrinkage occurred in the axial direction with about 12% shrinkage.
- the obtained silicon carbide heat-resistant ultralight porous structural material had the same structure as the sponge, a pore diameter of about lmm, an open porosity of 97%, and a density of 0.06 g / cm3.
- the mixing ratio of the phenol resin and the silicon powder is set so that the atomic ratio of carbon to silicon by carbonization of the phenol resin becomes 5: 3, and the slurry is prepared by dissolving the phenol resin with ethyl alcohol.
- this sponge was carbonized by firing at 1000 ° C. for 1 hour in an argon atmosphere.
- the obtained carbonaceous porous body was simultaneously subjected to reaction sintering and silicon melt impregnation in a vacuum at 1450 ° C. for 1 hour to obtain a sponge-shaped silicon carbide heat-resistant ultralight porous composite material.
- the sponge shrinks during carbonization and eventually shrinks slightly, with about 12% shrinkage in the axial direction.
- the resulting silicon carbide heat-resistant ultralight porous structural material had the same structure as the sponge, a pore diameter of 1.5 to 2 mm, an open porosity of 95%, and a density of lgZcm3.
- Example 1 When the sponge used in Example 1 was fired at 1000 ° C. for 1 hour in an argon atmosphere, the sponge disappeared without any trace.
- a slurry was prepared by dissolving a phenol resin in ethyl alcohol, impregnated into a polyurethane sponge having pores of 500 to 600 m, squeezed to such an extent that the slurry liquid did not cover the continuous pores, and dried.
- this sponge was carbonized by firing at 1000 ° C. for 1 hour in an argon atmosphere.
- the obtained carbonaceous porous body was simultaneously subjected to reaction sintering and silicon melt impregnation at 1450 ° C. for 1 hour in a vacuum, but no silicon impregnation occurred and the carbonaceous porous body remained.
- a silicon carbide heat-resistant lightweight porous composite material that maintains the shape of the first porous structure can be manufactured. , Even those with complex shapes can be easily manufactured, so many filters such as high-temperature filters, high-temperature structural members, heat insulating materials, molten metal filtration materials, partner plates, heater materials, high-temperature silencing materials, etc. Can be used for applications.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Dispersion Chemistry (AREA)
- Ceramic Products (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/485,119 US20050020431A1 (en) | 2001-08-07 | 2002-08-05 | Silicon carbide-based, porous structural material being heat-resistant and super lightweight |
| EP02755813.9A EP1449819B1 (en) | 2001-08-07 | 2002-08-05 | Silicon carbide-based heat-resistant, ultra-lightweight, porous structural material and process for producing the same |
| US11/581,091 US20070032371A1 (en) | 2001-08-07 | 2006-10-16 | Silicon carbide based, porous structural material being heat-resistant and super-lightweight |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001-238547 | 2001-08-07 | ||
| JP2001238547 | 2001-08-07 | ||
| JP2001248484A JP3699992B2 (ja) | 2001-08-07 | 2001-08-20 | 炭化ケイ素系耐熱性超軽量多孔質構造材及びその製造方法 |
| JP2001-248484 | 2001-08-20 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/581,091 Division US20070032371A1 (en) | 2001-08-07 | 2006-10-16 | Silicon carbide based, porous structural material being heat-resistant and super-lightweight |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003014042A1 true WO2003014042A1 (fr) | 2003-02-20 |
Family
ID=26620060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2002/007950 Ceased WO2003014042A1 (fr) | 2001-08-07 | 2002-08-05 | Materiau structural poreux super-leger et resistant a la chaleur a base de carbure de silicium |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US20050020431A1 (ja) |
| EP (1) | EP1449819B1 (ja) |
| JP (1) | JP3699992B2 (ja) |
| KR (1) | KR100618452B1 (ja) |
| WO (1) | WO2003014042A1 (ja) |
Cited By (2)
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| KR100891956B1 (ko) | 2006-09-18 | 2009-04-07 | 주식회사 칸세라 | 뮬라이트계 중공구를 포함하는 탄화규소 소결용 페이스트조성물 및 이를 사용한 다공성 탄화규소 필터의 제조방법 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004094044A1 (ja) * | 2003-04-23 | 2004-11-04 | National Institute Of Advanced Industrial Science And Technology | 可視光応答型3次元微細セル構造光触媒フィルター及びその製造方法並びに浄化装置 |
| US7704913B2 (en) | 2003-04-23 | 2010-04-27 | National Institute Of Advanced Industrial Science And Technology | Visible-light-responsive three-dimensional fine cell-structured photocatalytic filter, its manufacturing method and purifier device |
| JP4803653B2 (ja) * | 2003-04-23 | 2011-10-26 | 独立行政法人産業技術総合研究所 | 可視光応答型3次元微細セル構造光触媒フィルター及びその製造方法並びに浄化装置 |
| KR100891956B1 (ko) | 2006-09-18 | 2009-04-07 | 주식회사 칸세라 | 뮬라이트계 중공구를 포함하는 탄화규소 소결용 페이스트조성물 및 이를 사용한 다공성 탄화규소 필터의 제조방법 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1449819A1 (en) | 2004-08-25 |
| US20070032371A1 (en) | 2007-02-08 |
| KR100618452B1 (ko) | 2006-08-31 |
| KR20040032889A (ko) | 2004-04-17 |
| JP2003119085A (ja) | 2003-04-23 |
| EP1449819B1 (en) | 2013-07-03 |
| US20050020431A1 (en) | 2005-01-27 |
| EP1449819A4 (en) | 2009-03-04 |
| JP3699992B2 (ja) | 2005-09-28 |
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