JP7205671B1 - 炭化珪素質セラミックハニカム構造体及びその製造方法 - Google Patents
炭化珪素質セラミックハニカム構造体及びその製造方法 Download PDFInfo
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- JP7205671B1 JP7205671B1 JP2022539769A JP2022539769A JP7205671B1 JP 7205671 B1 JP7205671 B1 JP 7205671B1 JP 2022539769 A JP2022539769 A JP 2022539769A JP 2022539769 A JP2022539769 A JP 2022539769A JP 7205671 B1 JP7205671 B1 JP 7205671B1
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- particles
- silicon carbide
- ceramic honeycomb
- honeycomb structure
- phase
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 64
- 239000000919 ceramic Substances 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 239000002245 particle Substances 0.000 claims abstract description 108
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 40
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 23
- 239000011029 spinel Substances 0.000 claims abstract description 23
- 238000005192 partition Methods 0.000 claims abstract description 19
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 91
- 239000000395 magnesium oxide Substances 0.000 claims description 49
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 32
- 239000011148 porous material Substances 0.000 claims description 31
- 238000010304 firing Methods 0.000 claims description 30
- 239000011230 binding agent Substances 0.000 claims description 24
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 12
- 239000004927 clay Substances 0.000 claims description 9
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 5
- 239000000347 magnesium hydroxide Substances 0.000 claims description 5
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 5
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- 229910052863 mullite Inorganic materials 0.000 claims description 4
- 229910052839 forsterite Inorganic materials 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 3
- 229920000609 methyl cellulose Polymers 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- 239000001856 Ethyl cellulose Substances 0.000 claims description 2
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 2
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 229920001249 ethyl cellulose Polymers 0.000 claims description 2
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 2
- 239000001761 ethyl methyl cellulose Substances 0.000 claims description 2
- 235000010944 ethyl methyl cellulose Nutrition 0.000 claims description 2
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 2
- 229920013819 hydroxyethyl ethylcellulose Polymers 0.000 claims description 2
- 229920003063 hydroxymethyl cellulose Polymers 0.000 claims description 2
- 229940031574 hydroxymethyl cellulose Drugs 0.000 claims description 2
- 238000003763 carbonization Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 19
- 230000001590 oxidative effect Effects 0.000 description 13
- 230000035939 shock Effects 0.000 description 13
- 238000005245 sintering Methods 0.000 description 10
- 239000002994 raw material Substances 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 6
- 229910052753 mercury Inorganic materials 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910018626 Al(OH) Inorganic materials 0.000 description 2
- 229910019440 Mg(OH) Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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Abstract
Description
本発明の炭化珪素質セラミックハニカム構造体は、炭化珪素質多孔質体の隔壁により仕切られた軸方向に貫通する多数の流路を有し、前記隔壁が、骨材となる炭化珪素粒子と、前記炭化珪素粒子を結合する結合層とを有し、前記結合層が、少なくともコーディエライト相とスピネル相とを含み、前記コーディエライト相のモル比M1[=コーディエライト相/(コーディエライト相+スピネル相)]が0.4~0.9である。
本発明の炭化珪素質セラミックハニカム構造体の製造方法について、その一実施形態を説明する。
Al(OH)3=(1/2)Al2O3+(3/2)H2O、及び
Mg(OH)2=MgO+H2O
と表されるので、酸化アルミニウム1モルあたりのアルミナ分は0.5モル、酸化マグネシウム1モル中のマグネシア分は1モルと計算できる。この関係から、前述したようにアルミナ分及びマグネシア分のモル数を求め、モル比M2を求める。またアルミナ及びマグネシアの両方を含む化合物(例えば、スピネル)の粒子を用いた場合も同様に、この化合物中のアルミナ分(Al2O3)及びマグネシア分(MgO)を算出してモル比M2を求める。
表1に示す粒径を有する炭化珪素粒子、及び結合材の粒子(アルミナ源粒子及びマグネシア源粒子)を表1に示す添加量で有機バインダーとしてヒドロキシプロピルメチルセルロースとともに配合し混合した。混合した原料に水を添加して混練して可塑性の坏土を形成し、得られた坏土をハニカム構造体成形用の金型からスクリュー成形機により押出して、一辺が34 mmの外形四角形柱状で長さ304 mmのハニカム構造の成形体を成形した。この成形体を熱風乾燥機にて120℃で2時間乾燥後、1300℃の最高温度で酸化雰囲気で焼成して、隔壁厚さ8 mil(0.20 mm)及びセル密度300 cpsi(46.5セル/cm2)を有する実施例1~10、比較例2及び3の炭化珪素質セラミックハニカム構造体を得た。
炭化珪素粒子及び結合材の粒子の種類及び添加量を表1に示すように変更し、さらに成形体を熱風乾燥した後に550℃で3時間の脱脂工程を追加し、1450℃の最高温度でアルゴン雰囲気で2時間焼成した以外は実施例1と同様にして、比較例1の炭化珪素質セラミックハニカム構造体を得た。
気孔率、及びメジアン細孔径は、水銀圧入法により測定を行った。セラミックハニカム構造体から切り出した試験片(10 mm×10 mm×10 mm)を、Micromeritics社製オートポアIIIの測定セル内に収納し、セル内を減圧した後、水銀を導入して加圧し、加圧時の圧力と試験片内に存在する細孔中に押し込まれた水銀の体積との関係を求めた。前記圧力を細孔径に換算し、細孔径の大きい側から小さい側に向かって積算した累積細孔容積(水銀の体積に相当)を細孔径に対してプロットし、細孔径と累積細孔容積との関係を示すグラフを得た。水銀を導入する圧力は0.5psi(0.35×10-3 kg/mm2)とし、圧力から細孔径を算出する際の常数は、接触角=130°及び表面張力=484 dyne/cmの値を使用した。なお水銀の加圧力が1800psi(1.26kg/mm2、細孔径約0.1μmに相当)での累積細孔容積を全細孔容積とした。
熱膨張係数は、4.5 mm×4.5 mmの断面形状及び50 mmの長さの試験片を、長手方向が流路方向にほぼ一致するように切り出し、熱機械分析装置(TMA、リガク社製ThermoPlus、圧縮荷重方式/示差膨張方式)を用いて、一定荷重20 gをかけながら、昇温速度10℃/minで室温から800℃まで加熱した時の全長方向の長さの増加量を測定して、40~800℃間の平均熱膨張係数として求めた。
A軸圧縮破壊強度は、社団法人自動車技術会が定める規格M505-87「自動車排気ガス浄化触媒用セラミックモノリス担体の試験方法」に従い、セラミックハニカム構造体から直径24.5 mm及び長さ24.5 mmの試料片を採取して行った。
注(2):スピネル(モル比)=スピネル(モル)/[コーディエライト(モル)+スピネル(モル)]
Claims (5)
- 炭化珪素質多孔質体の隔壁により仕切られた軸方向に貫通する多数の流路を有する炭化珪素質セラミックハニカム構造体であって、前記隔壁が、金属珪素を含まず、骨材となる炭化珪素粒子と、前記炭化珪素粒子を結合する結合層とを有し、
前記結合層は、コーディエライト相とスピネル相とからなる、又はコーディエライト相とスピネル相とからなり、任意成分として、クリストバライト、ムライト、フォルステライトからなる群から選ばれた少なくとも一種を含み、
前記コーディエライト相のモル比M1[=コーディエライト相/(コーディエライト相+スピネル相)]が0.4~0.9であり、前記隔壁の気孔率が38~50%であり、前記隔壁のメジアン細孔径が5~20μmであることを特徴とする炭化珪素質セラミックハニカム構造体。 - 炭化珪素粒子と、アルミナ源粒子及びマグネシア源粒子からなる結合材と、有機バインダーとを配合し、混合、及び混練して得られた坏土をハニカム形状に押出成形し、得られた成形体を乾燥後、1200~1350℃の温度範囲で、大気雰囲気下で焼成する方法であって、
前記有機バインダーが、メチルセルロース、エチルセルロース、エチルメチルセルロース、カルボキシメチルセルロース、ヒドロキシプロピルメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシメチルセルロース、ヒドロキシエチルエチルセルロースからなる群から選ばれた少なくとも一種であり、
前記坏土が金属珪素及び造孔材を含まないことを特徴とする請求項1に記載の炭化珪素質セラミックハニカム構造体を製造する方法。 - 前記アルミナ源粒子及び前記マグネシア源粒子を、モル比M2[=(Al2O3)/(Al2O3+ MgO)]0.32~0.50で配合することを特徴とする請求項2に記載の炭化珪素質セラミックハニカム構造体の製造方法。
- 前記炭化珪素粒子100質量%に対して、前記アルミナ源粒子及び前記マグネシア源粒子を合計で6~15質量%配合することを特徴とする請求項2又は3に記載の炭化珪素質セラミックハニカム構造体の製造方法。
- 前記結合材のアルミナ源粒子がアルミナ粒子又は水酸化アルミニウム粒子であり、マグネシア源粒子が酸化マグネシウム粒子又は水酸化マグネシウム粒子であることを特徴とする請求項2~4のいずれかに記載の炭化珪素質セラミックハニカム構造体の製造方法。
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WO2013147321A1 (ja) * | 2012-03-28 | 2013-10-03 | 日本碍子株式会社 | 炭化珪素質多孔体、ハニカム構造体及び電気加熱式触媒担体 |
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JP4136319B2 (ja) | 2000-04-14 | 2008-08-20 | 日本碍子株式会社 | ハニカム構造体及びその製造方法 |
JP5193804B2 (ja) | 2008-10-30 | 2013-05-08 | 日本碍子株式会社 | 炭化珪素質多孔体及びその製造方法 |
EP2832712B1 (en) * | 2012-03-28 | 2017-08-09 | NGK Insulators, Ltd. | Porous material, honeycomb structure |
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EP4230279A1 (en) | 2023-08-23 |
WO2022202903A1 (ja) | 2022-09-29 |
KR102590832B1 (ko) | 2023-10-17 |
CN116669830A (zh) | 2023-08-29 |
US20230322630A1 (en) | 2023-10-12 |
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