JP2008120652A - セラミックハニカム成形体の焼成方法 - Google Patents
セラミックハニカム成形体の焼成方法 Download PDFInfo
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- JP2008120652A JP2008120652A JP2006308869A JP2006308869A JP2008120652A JP 2008120652 A JP2008120652 A JP 2008120652A JP 2006308869 A JP2006308869 A JP 2006308869A JP 2006308869 A JP2006308869 A JP 2006308869A JP 2008120652 A JP2008120652 A JP 2008120652A
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- ceramic honeycomb
- firing
- temperature
- molded body
- formed body
- Prior art date
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- Granted
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 117
- 238000010304 firing Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000007789 gas Substances 0.000 claims abstract description 53
- 239000011230 binding agent Substances 0.000 claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 238000005238 degreasing Methods 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 230000001590 oxidative effect Effects 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000012778 molding material Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 31
- 230000008569 process Effects 0.000 abstract description 11
- 238000004140 cleaning Methods 0.000 abstract 1
- 239000002912 waste gas Substances 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 17
- 238000000465 moulding Methods 0.000 description 11
- 238000002485 combustion reaction Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 229910052878 cordierite Inorganic materials 0.000 description 8
- 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 description 8
- 238000005336 cracking Methods 0.000 description 7
- 230000000630 rising effect Effects 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 210000002421 cell wall Anatomy 0.000 description 5
- 239000004927 clay Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 229920000609 methyl cellulose Polymers 0.000 description 5
- 239000001923 methylcellulose Substances 0.000 description 5
- 235000010981 methylcellulose Nutrition 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
-
- 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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
-
- 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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Filtering Materials (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Catalysts (AREA)
Abstract
【解決手段】 セラミック原料に有機バインダーを含む成形助剤を添加、混練した成形用坏土を、軸方向に並設した多数のセルを有するハニカム形状に成形し、セラミックハニカム成形体1を焼成炉3内に載置して昇温する工程において、有機バインダーが燃焼する200〜450℃の脱脂温度領域にある間、焼成炉3内にセラミックハニカム成形体1のセル11内を通過するガス流れを形成する。
【選択図】 図1
Description
上記セラミックハニカム成形体を焼成炉内に載置して昇温する工程において、上記有機バインダーが燃焼する200〜450℃の脱脂温度領域にある間、上記焼成炉内に上記セラミックハニカム成形体のセル内を通過するガス流れを形成することを特徴とする。
ΔT≦50/V+10(℃)
V:ハニカム成形体の見かけ体積(リットル)
を維持したまま昇温させる。
VT≦−1.6v2 +8v+50(℃/時間)
v:雰囲気ガス風量(m/s)
を満足するように設定すると、セラミックハニカム成形体の内外温度差を低減する効果が得やすい。
発生応力:σ=k×ε×E
ε=ΔV×L
(ε:ひずみ、E:ヤング率、ΔV:収縮率、k:係数)
すなわち、発生応力と収縮率、温度差は、下式の関係にある。 発生応力:σ∝ΔV(T)∝ΔT
このため、セラミックハニカム成形体1に温度分布が生じると、収縮率の差により応力が発生しやすくなる。例えば、昇温速度を上げようとした場合、図3に示すように、セラミックハニカム成形体1の外周部が高温(収縮率大)になり、中心部が低温(収縮率小)になりやすい。そして、発生応力が母材強度を上回る時に(母材強度<発生応力)、割れが発生すると推測される。
ΔT≦50/V+10(℃)
V:ハニカム成形体の見かけ体積(リットル)
を維持するように昇温させるとよい。例えば、セラミックハニカム成形体1の見かけ体積が2.5リットルでは、内外温度差が30℃、2.0リットルでは、内外温度差が35℃を超えないようにすることで、焼成割れを抑制することができる。
サンプル1:Φ144mm×L152mm(見かけ体積約2.5リットル)
サンプル2:Φ160mm×L100mm(見かけ体積約2.0リットル)
セル壁厚:12mil(サンプル1、2)
セルメッシュ:300cpsi(サンプル1、2)
VT≦−1.6v2 +8v+50(℃/時間)
v:酸化性ガス風量(m/s)
を満足するように設定すると、内外温度差を小さくして、割れを抑制する効果が得られる。
11 セル
2 棚板
21 通孔
3 焼成炉
31 ガス導入口
32 ガス導出口
4 流量検出器
5 セラミックハニカム構造体
Claims (8)
- セラミック原料に有機バインダーを含む成形助剤を添加、混練した成形用坏土を、軸方向に並設した多数のセルを有するハニカム形状に成形し、得られたセラミックハニカム成形体を焼成する方法であって、
上記セラミックハニカム成形体を焼成炉内に載置して昇温する工程において、上記有機バインダーが燃焼する200〜450℃の脱脂温度領域にある間、上記焼成炉内に上記セラミックハニカム成形体のセル内を通過するガス流れを形成することを特徴とするセラミックハニカム成形体の焼成方法。 - 上記脱脂温度領域において、3.5リットル以下の見かけ体積を有する上記セラミックハニカム成形体の中心部と最外周部の温度差をΔTとした時に、
ΔT≦50/V+10(℃)
V:ハニカム成形体の見かけ体積(リットル)
を維持したまま昇温させる請求項1記載のセラミックハニカム成形体の焼成方法。 - 上記セラミックハニカム成形体は、上記有機バインダー含有量が3%以上である請求項1または2記載のセラミックハニカム成形体の焼成方法。
- 上記セラミックハニカム成形体のセル内を通過するガスが、酸化性ガスである請求項1ないし3のいずれか1項に記載のセラミックハニカム成形体の焼成方法。
- 上記酸化性ガスは、酸素濃度が10%以上である請求項4記載のセラミックハニカム成形体の焼成方法。
- 上記セラミックハニカム成形体を通気性の棚板上に軸方向が上下方向となるように載置し、上記棚板に接する上記セラミックハニカム成形体の底面側からセル内に供給されて上面側へ抜けるガス流れを形成する請求項1ないし5のいずれか1項に記載のセラミックハニカム成形体の焼成方法。
- 上記セラミックハニカム成形体に供給されるガスの風量は、0.5m/s以上である請求項6記載のセラミックハニカム成形体の焼成方法。
- 上記脱脂温度領域における焼成雰囲気の昇温速度VTは、
VT≦−1.6v2 +8v+50(℃/時間)
v:雰囲気ガス風量(m/s)
を満足するように設定する請求項7項に記載のセラミックハニカム成形体の焼成方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006308869A JP4826439B2 (ja) | 2006-11-15 | 2006-11-15 | セラミックハニカム成形体の焼成方法 |
DE200710000895 DE102007000895B4 (de) | 2006-11-15 | 2007-11-14 | Verfahren zum Brennen eines keramischen Wabenkörpers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006308869A JP4826439B2 (ja) | 2006-11-15 | 2006-11-15 | セラミックハニカム成形体の焼成方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2008120652A true JP2008120652A (ja) | 2008-05-29 |
JP4826439B2 JP4826439B2 (ja) | 2011-11-30 |
Family
ID=39311354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2006308869A Expired - Fee Related JP4826439B2 (ja) | 2006-11-15 | 2006-11-15 | セラミックハニカム成形体の焼成方法 |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP4826439B2 (ja) |
DE (1) | DE102007000895B4 (ja) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010168231A (ja) * | 2009-01-20 | 2010-08-05 | Tdk Corp | 脱脂方法および脱脂用治具 |
JP2012076953A (ja) * | 2010-09-30 | 2012-04-19 | Tokyo Yogyo Co Ltd | 炭化ケイ素質ハニカム体 |
JP2012076954A (ja) * | 2010-09-30 | 2012-04-19 | Tokyo Yogyo Co Ltd | 炭化ケイ素質ハニカム体の製造方法 |
US20120111477A1 (en) * | 2010-11-10 | 2012-05-10 | Ibiden Co., Ltd. | Method of manufacturing honeycomb structure and degreasing apparatus for honeycomb molded body |
JP2012116742A (ja) * | 2010-11-10 | 2012-06-21 | Ibiden Co Ltd | ハニカム構造体の製造方法、およびハニカム成形体の脱脂処理装置 |
JP2018187772A (ja) * | 2017-04-28 | 2018-11-29 | 日本碍子株式会社 | ハニカム構造体の製造方法 |
JP2019151508A (ja) * | 2018-03-01 | 2019-09-12 | イビデン株式会社 | ハニカム構造体の製造方法 |
JP2019150754A (ja) * | 2018-03-01 | 2019-09-12 | イビデン株式会社 | ハニカム構造体の製造方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100130352A1 (en) * | 2008-11-25 | 2010-05-27 | Dabich Ii Leonard Charles | Methods For Processing Shaped Bodies |
Citations (5)
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---|---|---|---|---|
JPS63210593A (ja) * | 1987-02-27 | 1988-09-01 | 日本碍子株式会社 | セラミツクハニカム構造体の焼成法 |
JPH10263419A (ja) * | 1997-03-25 | 1998-10-06 | Babcock Hitachi Kk | 触媒成形体の焼成方法と焼成装置 |
JPH1179851A (ja) * | 1997-09-02 | 1999-03-23 | Ngk Insulators Ltd | セラミックハニカム構造体の焼成方法 |
JP2002020174A (ja) * | 2000-06-29 | 2002-01-23 | Ibiden Co Ltd | 連続脱脂炉、多孔質炭化珪素焼結体の製造方法 |
JP2006232590A (ja) * | 2005-02-23 | 2006-09-07 | Ngk Insulators Ltd | セラミック構造体の製造方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004053624B4 (de) * | 2004-11-03 | 2008-03-06 | Ctb Ceramic Technology Gmbh Berlin | Verfahren und Vorrichtung zum beschleunigten Brennen von porösen Keramikformteilen |
DE202006006993U1 (de) * | 2006-04-27 | 2006-07-06 | Dbk David + Baader Gmbh | Werkstückträger und Heißluftofen |
-
2006
- 2006-11-15 JP JP2006308869A patent/JP4826439B2/ja not_active Expired - Fee Related
-
2007
- 2007-11-14 DE DE200710000895 patent/DE102007000895B4/de not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS63210593A (ja) * | 1987-02-27 | 1988-09-01 | 日本碍子株式会社 | セラミツクハニカム構造体の焼成法 |
JPH10263419A (ja) * | 1997-03-25 | 1998-10-06 | Babcock Hitachi Kk | 触媒成形体の焼成方法と焼成装置 |
JPH1179851A (ja) * | 1997-09-02 | 1999-03-23 | Ngk Insulators Ltd | セラミックハニカム構造体の焼成方法 |
JP2002020174A (ja) * | 2000-06-29 | 2002-01-23 | Ibiden Co Ltd | 連続脱脂炉、多孔質炭化珪素焼結体の製造方法 |
JP2006232590A (ja) * | 2005-02-23 | 2006-09-07 | Ngk Insulators Ltd | セラミック構造体の製造方法 |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010168231A (ja) * | 2009-01-20 | 2010-08-05 | Tdk Corp | 脱脂方法および脱脂用治具 |
JP2012076953A (ja) * | 2010-09-30 | 2012-04-19 | Tokyo Yogyo Co Ltd | 炭化ケイ素質ハニカム体 |
JP2012076954A (ja) * | 2010-09-30 | 2012-04-19 | Tokyo Yogyo Co Ltd | 炭化ケイ素質ハニカム体の製造方法 |
US20120111477A1 (en) * | 2010-11-10 | 2012-05-10 | Ibiden Co., Ltd. | Method of manufacturing honeycomb structure and degreasing apparatus for honeycomb molded body |
WO2012063341A1 (ja) * | 2010-11-10 | 2012-05-18 | イビデン株式会社 | ハニカム構造体の製造方法、およびハニカム成形体の脱脂処理装置 |
JP2012116742A (ja) * | 2010-11-10 | 2012-06-21 | Ibiden Co Ltd | ハニカム構造体の製造方法、およびハニカム成形体の脱脂処理装置 |
US8821661B2 (en) | 2010-11-10 | 2014-09-02 | Ibiden Co., Ltd. | Method of manufacturing honeycomb structure and degreasing apparatus for honeycomb molded body |
JP2018187772A (ja) * | 2017-04-28 | 2018-11-29 | 日本碍子株式会社 | ハニカム構造体の製造方法 |
JP2019151508A (ja) * | 2018-03-01 | 2019-09-12 | イビデン株式会社 | ハニカム構造体の製造方法 |
JP2019150754A (ja) * | 2018-03-01 | 2019-09-12 | イビデン株式会社 | ハニカム構造体の製造方法 |
JP7112212B2 (ja) | 2018-03-01 | 2022-08-03 | イビデン株式会社 | ハニカム構造体の製造方法 |
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