WO2004067147A1 - 窒化ケイ素質ハニカムフィルタの製造法 - Google Patents
窒化ケイ素質ハニカムフィルタの製造法 Download PDFInfo
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- WO2004067147A1 WO2004067147A1 PCT/JP2004/000883 JP2004000883W WO2004067147A1 WO 2004067147 A1 WO2004067147 A1 WO 2004067147A1 JP 2004000883 W JP2004000883 W JP 2004000883W WO 2004067147 A1 WO2004067147 A1 WO 2004067147A1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5445—Particle size related information expressed by the size of the particles or aggregates thereof submicron sized, i.e. from 0,1 to 1 micron
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/80—Phases present in the sintered or melt-cast ceramic products other than the main phase
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
Definitions
- the present invention relates to a method for producing a silicon nitride honeycomb filter suitable for removing dust and the like contained in high-temperature exhaust gas.
- Silicon nitride has excellent properties such as heat resistance, corrosion resistance, chemical resistance, and strength, and is expected to be used as a filter for dust collection and dedusting in high temperature and corrosive environments, and as an exhaust gas purification filter for diesel engines. Have been.
- a method of adding spherical organic polymer particles as a pore-forming agent to silicon nitride particles and performing a heat treatment see, for example, Japanese Patent Application Laid-Open No. 2002-121773.
- a method in which hollow oxide particles are added as a pore-forming agent and a heat treatment is performed for example, see Japanese Patent Application Laid-Open No. 2002-212704.
- the method using silicon nitride particles is generally easier to manufacture than the method using metal gay particles, but the cost of manufacturing may be disadvantageous due to the high cost of silicon nitride particles. .
- a method of adding organic polymer particles or metal oxide hollow particles as a pore-forming agent to metal silicon particles and performing a heat treatment for example, International Publication No. WO 01/47983 33 See.
- the method of using metal gay particles is advantageous in terms of manufacturing cost as compared with the method of using silicon nitride particles, but the temperature is controlled because of the heat generated during the nitriding of metal silicon. Difficult and sometimes accompanied by excessive heat generation, which can cause deformation and melting of the sintered body. In particular, if the size of the sintered body is large and the temperature distribution is likely to occur during heating, cracks may easily occur in the sample due to thermal shock, and production requires more strict control.
- the bonding strength between the compounded silicon nitride particles and the silicon nitride particles formed by nitriding the metal gay particles is insufficient, so that the honeycomb filler for diesel particulates is not suitable.
- the strength of the structure made of a porous thin partition wall is reduced. Disclosure of the invention
- the present invention uses a mixed particle of metal silicon particles and silicon nitride particles as a starting material, and allows easy nitridation of the metal silicon without causing deformation or melting of the sintered body, high strength, dust removal, dedusting, and the like.
- the aim is to provide a manufacturing method of a honeycomb nitride honeycomb filter that is optimal for dust.
- the present invention relates to a metal silicon particle having an average particle diameter of 0.2 to 50 ⁇ m, 5 to 95% by mass and a silicon nitride particle having an average particle diameter of 0.2 to 40 m, 3 to 90% by mass.
- a honeycomb formed article comprising a mixture of 0.1 to 25% by mass of force particles and a pore-forming agent, wherein the mixture is 50 to 95% by mass, and the pore-forming agent is 5 to 50% by mass. %,
- the heat treatment in a nitrogen atmosphere of a honeycomb formed body containing 80% by mass or more of the mixture and the pore-forming agent substantially converts the metal silicon into a silicon nitride.
- the present invention provides a method for manufacturing a honeycomb nitride honeycomb filter characterized by the following. BEST MODE FOR CARRYING OUT THE INVENTION
- a metal gay metal having an average particle diameter (hereinafter, simply abbreviated as an average particle diameter) of 0.2 to 50 m is used.
- a mixture 50 to 95% by mass of particles (hereinafter, mass% is simply referred to as%), 3 to 90% of silicon nitride particles having an average particle size of 0.2 to 40m, and 0.1 to 25% of silica particles 50
- a honeycomb formed body containing up to 95% and a pore-forming agent of 5 to 50% and having a combined amount of the mixture and the pore-forming agent of 80% or more is used.
- the relationship between the amounts in a molded article is indicated by solid content conversion.
- a mixture of metal gay particles, silicon nitride particles and silica particles is used.
- the metal silicon particles are 5 to 95%. If the content of the metal silicon particles is less than 5%, the bonding between the compounded silicon nitride particles and the silicon nitride particles resulting from the reaction sintering of the metal silicon becomes insufficient. On the other hand, if it exceeds 95%, nitridation of metal silicon is an exothermic reaction, and excessive heat is generated during the reaction, causing
- the amount of metal silicon particles is preferably from 20 to 90%, particularly preferably from 30 to 80%.
- the content of the gay nitride particles is 3 to 90%. If the content of silicon nitride particles is less than 3%, as described above, excessive heat may be generated during nitriding of the metal silicon.On the other hand, if it exceeds 90%, the added silicon nitride particles may not be added. However, the bonding with the silicon nitride particles generated by nitriding the metal silicon (hereinafter referred to as nitrided silicon nitride particles) may be insufficient.
- the content of silicon nitride particles is preferably from 10 to 80%, particularly preferably from 20 to 70%.
- the amount of the silica particles in the mixture is 0.1 to 25%. If the silica particle content is less than 0.1%, the bonding between the added silicon nitride particles and the nitrided silicon nitride particles is insufficient, while if it exceeds 25%, the amount of liquid phase generated during sintering becomes insufficient. Due to too much, deformation and defects may occur in the partition wall of the bridge.
- the silica particles comprise S I_ ⁇ 2 minutes 90%, porosity refers to less than 3 0%.
- the silica particles may be added in a form such as a sily sol.
- the amount of silica particles is preferably from 4 to 20%, particularly preferably from 5 to 17%.
- the SiO 2 content of the silica particles is preferably 95% or more, more preferably 98% or more.
- the porosity of the silica particles is preferably 20% or less. , 10% or less. In this specification, the porosity is represented by% according to a customary convention.
- silicide particles The reason for adding silicide particles is that a mixture having only silicon nitride particles and metal silicon particles may not provide a filter having sufficient strength.
- silica particles By adding silica particles, sufficient strength can be obtained even with a porous body having a large number of porous partition walls such as a filter, and since firing shrinkage is small, firing shrinkage due to reactive sintering of metal silicon is zero. A certain effect can be used, and the deformation is reduced.
- Si 0 2 components are included as such, these Si 0 2 components also contribute to the bonding between the silicon nitride particles and the nitrided silicon nitride particles. Therefore, the sum of the S I_ ⁇ 2 minutes from the other S I_ ⁇ 2 minutes in the silica particles child, is contained 0.2 to 2 0% in Ha second cam shaped body as S i 0 2 min preferable.
- the average particle diameter of the metal silicon particles is 0.2 to 50 m. If the average particle size of the metal silicon particles is less than 0.2 / m, many closed pores that do not contribute to the filter function will be formed, or the pore diameter will be too small. Bring increase. On the other hand, if the average particle diameter of the metal silicon particles exceeds 50 m, the non-nitrided metal silicon particles are likely to remain inside the sintered body, which may cause deformation of the partition walls of the filter and decrease in strength. If the average particle diameter of the metal silicon particles is 5 to 40 m, it is preferable from the viewpoint of molding stability and mechanical strength of the filter, and particularly preferably 10 to 35.
- the purity of the metal silicon particles is not particularly limited, but a purity of 95% or more is preferable because the high-temperature characteristics of the porous body after sintering are not hindered.
- the average particle size of the silicon nitride particles is limited to 0.2 to 40 tm is that if the average particle size is less than 0.2 m, the silicon nitride particles can easily enter the pores, and the pore diameter can be reduced. This is because the porosity becomes too small and the filter function decreases and the pressure loss increases. On the other hand, if the average particle size of the silicon nitride particles exceeds 40 m, the strength of the filter may decrease. More preferred of the gay nitride particles The average particle size is 0.5 to 30 xm, which is preferable in terms of nitriding stability and mechanical strength of the filter.
- the purity of the gay nitride particles is preferably at least 95%, but more preferably at least 98%, from the viewpoint of the high-temperature characteristics of the film.
- metal oxide hollow particles and / or organic polymer particles can be used as the pore-forming agent.
- the metal oxide hollow particles hereinafter simply abbreviated as hollow particles
- the porosity of the hollow particles is 30. % Or more. If the porosity is less than 30%, the ability to form pores may be insufficient.
- the porosity of the hollow particles is preferably from 40 to 80%, more preferably from 50 to 70%. In this specification, the porosity is expressed in%, but is a dimensionless value.
- the hollow particles are mainly composed of oxides of A1 and / or Si (hereinafter referred to as A1-Si hollow particles), the porosity may increase due to gasification of the components, or It is preferable because the solid solution has an effect of improving oxidation resistance.
- the softening temperature of the A 1 -Si type hollow particles decreases, The form of the hollow particles hardly remains in the fired body, the porosity and the average pore diameter are both large, and the one having a small pore diameter is preferable because a porous body having a small pore distribution can be obtained.
- the amount of at least one selected from the group consisting of magnesium oxide, calcium oxide and titanium oxide is such that 10 to 40 parts by mass of the honeycomb is 100 to 100 parts by mass of the A1-Si based hollow particles. It is preferably contained in a molded article, more preferably 15 to 35 parts by mass in a honeycomb molded article, and particularly preferably 20 to 30 parts by mass in a honeycomb molded article.
- the portion corresponding to the outer skin may be dense or porous.
- the hollow particles are preferably spherical in shape because they are easily available. However, particles other than spherical particles may be hollow.
- the main component of the hollow particles is preferably a metal oxide, but a compound such as a hydroxide or a carbonate that forms a metal oxide by heating can also be suitably used.
- Organic polymer particles can also be used as pore-forming agents. Organic polymers decompose and disperse during heat treatment to form pores. If the pore-forming agent is an organic polymer particle, especially a thermally decomposable polymer particle, it decomposes and scatters during the heat treatment process, and does not leave a residue in the sintered body. Preferable because it does not impair.
- organic polymers examples include polyvinyl alcohol, acrylic resin, vinyl acetate resin, and cellulose. If the organic polymer particles added as a pore-forming agent are not sufficiently thermally decomposed during the heating process and remain in a large amount as carbon during the heating process, the subsequent heat treatment process may generate silicon carbide. This is not preferable because the pores are easily blocked. In this regard, it is particularly preferable to use the acrylic resin particles as the pore-forming agent because they are easily decomposed by heat and the amount of carbon remaining is small.
- the desired effect can be obtained by using only the hollow particles, the organic polymer alone, or the compounding of the hollow particles and the organic polymer at the same time as the pore forming agent.
- the particle size is from 20 to 150 m
- the resulting filter has a large porosity and is preferably strong because the strength is secured. If the average particle size of the pore-forming agent is less than 20 ix m, the contribution to pore formation is reduced, while if the average particle size exceeds 150 m, the strength of the obtained film is insufficient. Therefore, it is not preferable.
- the content of the pore-forming agent is 5 to 50% in the molded body. If the content is less than 5%, the proportion of pores that fulfill the filter function is not sufficient.
- the total amount of the metal silicon particles, the silicon nitride particles, and the pore-forming agent is at least 80% in the molded body. If the total amount of the metal silicon particles, the silicon nitride particles, and the pore-forming agent is less than 80% in the molded product, a filter having desired characteristics may not be obtained.
- a general mixing means such as a pole mill or a mixer can be used for mixing the metal silicon particles, the silicon nitride particles, the silica particles and the pore-forming agent.
- a forming aid such as water, an organic solvent, an organic binder, or the like is appropriately added to the mixed raw material, and the mixture is kneaded.
- an organic binder polyvinyl alcohol or a modified product thereof, starch or a modified product thereof, carboxymethylcellulose, hydroxymethylcellulose, polyvinylpyrrolidone, acrylic resin or acrylic copolymer, vinyl acetate resin or pinyl acetate-based Organic substances such as copolymers, polyethylene glycol, propylene glycol, and glycerin can be used.
- the binder is an organic polymer, the solid content thereof is included in the pore-forming agent to express the quantitative relationship.
- the molding aid such as the organic binder is removed by degreasing.
- Degreasing is preferably performed at a temperature lower than the melting temperature of the metal silicon, and is preferably maintained at a temperature of 300 to 900 ° C.
- the degreasing atmosphere may be an oxidizing atmosphere such as the air or an inert atmosphere such as a nitrogen gas or an Ar gas.However, when the degreasing is performed in the air, the surfaces of the metal silicon particles and the gay nitride particles are excessively oxidized. Not to be.
- the degreasing may be performed as a separate step from the first heat treatment described later, but may be performed during the temperature rise in the first heat treatment.
- the heat treatment conditions for the first stage during the heat treatment of the molded body it is preferable to hold the molded body at a temperature of 1200 to 140 ° C. for 1 to 12 hours in a nitrogen atmosphere. If the temperature is lower than 1200, nitriding of the metal gay metal does not proceed sufficiently, while if the temperature exceeds 140 ° C, the metal gay near the melting point (at 140 ° C) of the metal silicon. It is not preferable because the elementary particles are melted and the shape of the sintered body cannot be maintained.
- the temperature holding time is less than 1 hour, the nitriding of the metal silicon particles is insufficient, which is not preferable. If the temperature holding time exceeds 12 hours, the progress of the nitridation reaction is slowed, and the operating cost is increased, which is not preferable. .
- the temperature may be lowered once after degreasing, or may be performed without lowering the temperature.
- the heat treatment conditions for the second stage it is preferable to maintain the temperature in a nitrogen atmosphere at 150 to 180 for 1 to 12 hours. If the temperature is lower than 1500, the bonding between the compounded silicon nitride particles and the metal nitride particles does not proceed sufficiently, and the strength of the filter is insufficient. On the other hand, when it is more than 180, the silicon nitride particles are decomposed, which is not preferable. Also, the temperature holding time If the time is less than 1 hour, the bonding between the silicon nitride particles does not proceed sufficiently, which is not preferable. On the other hand, if the time exceeds 12 hours, the silicon nitride is easily decomposed particularly at high temperatures, which is not preferable. Note that the heat treatment of the first stage and the heat treatment of the second stage may be performed at any time in the middle or continuously without lowering the temperature.
- the rate of temperature rise during the heat treatment is appropriately selected depending on the size and shape of the compact, but the degreasing step is preferably performed at 50 to 200 ° CZh because a large amount of decomposed gas is generated.
- the nitrogen atmosphere refers to an atmosphere containing substantially only nitrogen and no oxygen, but may contain another inert gas or hydrogen.
- the partial pressure of nitrogen is preferably 50 kPa or more.
- the porosity of the silicon nitride film obtained by this production method is preferably 30 to 80%. If the porosity is less than 30%, the pressure loss increases, which is not preferable. If the porosity exceeds 80%, the strength is low, which is not preferable.
- the porosity is more preferably from 40 to 75%, particularly preferably from 50 to 70%.
- the average pore diameter measured by the mercury porosimetry of the silicon nitride filter obtained by this production method is preferably 5 to 40 m. If the average pore diameter is less than 5 m, the pressure loss during use of the filter is increased, which is not preferable. If the average pore diameter exceeds 40, it is not preferable because it becomes difficult to trap and remove exhaust particulates such as diesel paticles.
- the average pore diameter is more preferably from 8 to 30 m, particularly preferably from 10 to 25 m.
- Average particle size 18 ⁇ m metal Kei particles (Yamaishi Metal Co., S i (as the element): 9 9%, S i 0 2 2. 1) and an average particle diameter of 25 / m in the nitride Kei particles ( electrochemical E Gosha Ltd., trade name: SNBL, S i 3 N 4 97%, S i 0 2 1. 1%), an average particle diameter 20 m of acrylic resin particles (manufactured by Soken chemical & Engineering Co., trade name: MR 20 ) And silica sol (prepared by hydrolyzing an aqueous solution of ethyl chelate with aqueous ammonia).
- Table 1 shows the composition ratios
- Table 2 shows the observation results.
- the numbers in 0 at the bottom of the metal silicon particles, the silicon nitride particles, and the silica particles represent the total of the metal silicon particles, the silicon nitride particles, and the silica particles, that is, the ratio of each particle in the mixture.
- the pore former contains methyl cellulose in addition to the acryl resin. Examples 2 to 8 are working examples.
- the obtained kneaded material for extrusion molding is extruded by a vacuum extrusion molding machine having a die for honeycomb body extrusion to obtain a honeycomb molded body.
- the outer shape of the honeycomb formed article has a diameter of 150 mm, a length of 150 mm, a cell wall thickness of 0.25 mm, and a cell number of 200 cells / 6.45 16 cm 2 .
- the cross-sectional area per cell, that is, per through hole, is about 3.2 mm 2 .
- Nitriding characteristics The presence or absence of abnormal heat generation due to nitriding of metal silicon is estimated by changing the control power value of the electric furnace. When abnormal heat generation occurs, a decrease in control power is observed.
- Pore characteristics The average pore diameter and porosity are measured by mercury porosime overnight (trade name: AUTOSCAN-33, manufactured by Duasa Ionics).
- the crystal phase is identified using an X-ray diffractometer (trade name: Geigerflex RAD-IA) manufactured by Rigaku Corporation.
- Coefficient of thermal expansion measurement Measure from room temperature to 1000 using a thermal dilatometer (manufactured by Rigaku Corporation).
- Compressive strength of an 82 cam-shaped product (hereinafter simply referred to as compressive strength): A 12 mm long test piece consisting of 7 X 7 cells was cut out from an eight-comb-shaped filler and weighted in parallel with the extrusion direction. Is applied at 0.5 mm / min to measure the compressive strength. table 1
- Example 1 0 33. 8 22. 5 24. 1 19.6 25. 1
- Example 1 is the same as Example 1 except that the pore-forming agent is changed to alumina hollow particles having an average particle size of 25 m instead of the polyacrylic resin.
- Hollow alumina particles commercially available high purity alumina powder (manufactured by Sumitomo Chemical Co., Ltd., trade name: AKP- 50, S i 0 2 min 0.1 less than 1%) with respect to the dispersion of the ion-exchanged water and a polycarboxylic acid Spray-dried slurry prepared using an agent (Chukyo Yushi Co., Ltd., trade name: Cerna D-305), and the resulting hollow granules were calcined in air at 1200 ° C for 3 hours and then sieved.
- each of the hollow particles was 2% based on the total of the mixture (75.2% of metal gay particles, 18.8% of silicon nitride particles, and 6% of silica particles) and the hollow particles. , 10, 20, 60%.
- the amount of the pore-forming agent is the total amount of the hollow particles and the binder, methylcellulose.
- Table 3 shows the composition ratios, and Table 4 shows the observation results. Examples 11 to 13 are working examples. Table 3
- metal silicon particles with an average particle size of 100 m are heated in nitrogen at 1300 ° C for 12 hours, and then heated at 1450 ° C for another 24 hours, and pulverized and sieved.
- the average particle size was changed to approximately 0.1 lm, 2 m, 5 ii, 15 rn, 35 m, and 55 zm silicon nitride particles, respectively, and the average particle size was replaced with polyacrylic resin as the pore-forming agent.
- metal silicon particles with an average particle size of 18 m they were changed to metal silicon particles with an average particle size of 0.1 / 1 m, 2 ⁇ , 10 ⁇ m, 40 m, and 100 im, respectively.
- a gay nitride-based 82 cam film suitable for dust removal and dust removal can be easily produced.
- the carbon nitride filler obtained by the present invention has excellent shape accuracy, high strength, and an average pore diameter suitable for collecting diesel paticles and the like. It is suitable for use as a diesel particulate filter which is required to have high strength, heat resistance, corrosion resistance, durability, etc., since it has the same porosity as conventional products.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7135140B2 (en) | 2003-07-29 | 2006-11-14 | Asahi Glass Company, Limited | Method of producing silicon nitride honeycomb filter |
JP2014005190A (ja) * | 2012-05-31 | 2014-01-16 | Kyocera Corp | セラミック焼結体,これを用いた耐食性部材およびフィルターならびにハレーション防止部材 |
KR101474062B1 (ko) | 2012-05-07 | 2014-12-17 | 주식회사 엘지화학 | 역삼투막 및 이의 제조방법 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2001316188A (ja) * | 2000-04-28 | 2001-11-13 | Asahi Glass Co Ltd | 窒化ケイ素質多孔体およびその製造方法 |
JP2002121073A (ja) * | 2000-10-13 | 2002-04-23 | Asahi Glass Co Ltd | 窒化ケイ素フィルタの製造法 |
JP2002284586A (ja) * | 2001-03-26 | 2002-10-03 | Ngk Insulators Ltd | 窒化珪素多孔体及びその製造方法 |
JP3373502B2 (ja) * | 1999-12-24 | 2003-02-04 | 旭硝子株式会社 | 窒化ケイ素フィルタおよびその製造法 |
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JP3373502B2 (ja) * | 1999-12-24 | 2003-02-04 | 旭硝子株式会社 | 窒化ケイ素フィルタおよびその製造法 |
JP2001316188A (ja) * | 2000-04-28 | 2001-11-13 | Asahi Glass Co Ltd | 窒化ケイ素質多孔体およびその製造方法 |
JP2002121073A (ja) * | 2000-10-13 | 2002-04-23 | Asahi Glass Co Ltd | 窒化ケイ素フィルタの製造法 |
JP2002284586A (ja) * | 2001-03-26 | 2002-10-03 | Ngk Insulators Ltd | 窒化珪素多孔体及びその製造方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US7135140B2 (en) | 2003-07-29 | 2006-11-14 | Asahi Glass Company, Limited | Method of producing silicon nitride honeycomb filter |
KR101474062B1 (ko) | 2012-05-07 | 2014-12-17 | 주식회사 엘지화학 | 역삼투막 및 이의 제조방법 |
JP2014005190A (ja) * | 2012-05-31 | 2014-01-16 | Kyocera Corp | セラミック焼結体,これを用いた耐食性部材およびフィルターならびにハレーション防止部材 |
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