JP6633014B2 - 炭化珪素質ハニカム構造体の製造方法 - Google Patents
炭化珪素質ハニカム構造体の製造方法 Download PDFInfo
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- C04B38/0006—Honeycomb structures
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- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
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- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B2003/203—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded for multi-channelled structures, e.g. honeycomb structures
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- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
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Description
上記に示した本実施形態のアルミナ含有率が70wt%以上のセラミックス材料を用いて焼成用部材(実施例)を作成し、一方、従来から使用されている窒化物結合炭化珪素を用いて焼成用部材(比較例)を作成した。
得られた焼成用部材(実施例、比較例)をそれぞれ、ハニカム成形体を焼成するために炉内温度の調整された焼成炉を通過させた回数(通し回数)毎に重量を測定し、未通過(0回)時の重量を基準として重量変化率を策定した。その他の条件は実施例及び比較例で共通とした。この場合、還元性ガスの添加は行っていない。その結果を図3のグラフに示す。
次に、実施例の焼成用部材を使用することにより、SiO蒸気等の分解物の発生が抑制される効果の検証を行った。但し、焼成工程中のSiO蒸気等の分解物(ダスト)の発生量を直接計測することは困難であるため、焼成炉に設置された排気弁のダスト詰まりによる圧力上昇量を測定した。排気弁のダスト詰まりを取り除いて清掃を行った状態(経過時間=0h)からの経過時間を横軸、経過時間毎の圧力上昇量を縦軸としたグラフを図4に示す。なお、経過時間=12hのときに、排気弁のダスト詰まりの再清掃を行っている(グラフ中の矢印参照)。
炉内空間に還元性ガスを添加することにより、酸素ゲッターとして機能することを確認した。具体的には焼成炉内に、不活性ガス(アルゴン)とともに還元性ガスとしてメタンガスをガス濃度をそれぞれ変化させて添加した。この場合、メタンガス添加濃度/ppm(以下、「メタンガス濃度」と称す。)と、焼成炉内COガス濃度/ppm(以下、「COガス濃度」と称す。)の値の変化を図5のグラフに示す。なお、メタンガス濃度は、100ppm、800ppm、2400ppmにそれぞれ変化させた。
実施例の焼成用部材を用いて、ハニカム成形体の焼成を行った。その結果、酸素濃度が高くなると発生するSiO付着によるハニカム焼成体の白色化の現象は確認されなかった(図示しない)。更に、気孔率、熱伝導率、圧縮強度等の特性も比較例の焼成用部材を用いたものと同等であることが確認された(いずれも図示しない)。
図6に実施例及び比較例の焼成用部材を用いて焼成を行ったハニカム構造体(最終製品)での初期圧損/kPaの値の比較を示す。この結果から、焼成用部材の違いによって最終製品であるハニカム構造体の性能に影響を及ぼすことがないことが確認された。
Claims (4)
- 押出成形された炭化珪素質成分を含むハニカム成形体を焼成用部材とともに、焼成炉に導入して焼成し、炭化珪素質ハニカム構造体を製造する焼成工程を備える炭化珪素質ハニカム構造体の製造方法であって、
前記焼成用部材は、
アルミナ含有率が70wt%以上のセラミックス材料を用いて形成され、
前記焼成工程は、
前記焼成炉の炉内空間に不活性ガスを供給する不活性ガス供給工程と、
前記炉内空間に還元性ガスを添加するガス添加工程と
を更に備え、
前記ガス添加工程は、
前記不活性ガス供給工程によって前記炉内空間を不活性ガス雰囲気下に調整した後に実施され、
前記還元性ガスは、
炭化水素ガスが利用される炭化珪素質ハニカム構造体の製造方法。 - 前記ガス添加工程は、
前記不活性ガス雰囲気下の前記炉内空間に対し、1ppm〜5000ppmのガス濃度となる前記還元性ガスを添加する請求項1に記載の炭化珪素質ハニカム構造体の製造方法。 - 前記焼成用部材は、
前記ハニカム成形体を載置する棚板、及び、前記棚板に載置された前記ハニカム成形体の周りを囲み、前記ハニカム成形体を上下に載置する枠体を含む請求項1または2に記載の炭化珪素質ハニカム構造体の製造方法。 - 前記不活性ガスは、
アルゴンガスである請求項1〜3のいずれか一項に記載の炭化珪素質ハニカム構造体の製造方法。
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JP2017053687A JP6633014B2 (ja) | 2017-03-17 | 2017-03-17 | 炭化珪素質ハニカム構造体の製造方法 |
US15/906,153 US11034624B2 (en) | 2017-03-17 | 2018-02-27 | Manufacturing method of silicon carbide-based honeycomb structure |
DE102018001783.5A DE102018001783A1 (de) | 2017-03-17 | 2018-03-06 | Verfahren zur Herstellung einer auf Siliciumcarbid basierenden Wabenstruktur |
CN201810182654.9A CN108627017B (zh) | 2017-03-17 | 2018-03-06 | 碳化硅质蜂窝结构体的制造方法 |
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JP6633014B2 true JP6633014B2 (ja) | 2020-01-22 |
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JP7249848B2 (ja) * | 2019-03-28 | 2023-03-31 | 日本碍子株式会社 | 炭化珪素含有セラミックス製品の製造方法 |
CN113880584B (zh) * | 2021-11-16 | 2022-12-16 | 宜兴王子制陶有限公司 | 一种改进的碳化硅蜂窝陶瓷单元体快速烧成方法 |
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JP2008273809A (ja) | 2007-04-06 | 2008-11-13 | Hitachi Metals Ltd | フェライト焼結体およびコイル部品並びにフェライト焼結体の製造方法 |
JP6224637B2 (ja) * | 2015-02-24 | 2017-11-01 | 日本碍子株式会社 | ハニカム構造体の製造方法、及びハニカム成形体 |
JP6224643B2 (ja) * | 2015-03-26 | 2017-11-01 | 日本碍子株式会社 | 棚板割れ検知方法、ハニカム構造体の搬送方法、棚板割れ検知装置、及び棚板搬送装置 |
JP6553994B2 (ja) | 2015-09-08 | 2019-07-31 | 株式会社Subaru | 飛翔***置算出システム、飛翔***置算出方法及び飛翔***置算出プログラム |
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