JP2005509586A - 熱衝撃耐性セラミック混成材料 - Google Patents
熱衝撃耐性セラミック混成材料 Download PDFInfo
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Abstract
Description
この発明の上記の目的及びその他の目的は、繰り返し利用において熱衝撃によるクラッキングを生じることなく、2,200Fを超える温度に耐えることができるセラミック混成材料によって達成できた。とくに一つのものは、強化繊維の網とマトリックスを含み、焼結段階前において網に含浸させるアルミナゾルから形成され、焼結段階後にはマトリックスが網に確実に固定されている。
高温熱衝撃耐性セラミックを得るためには、すなわち、2,200F以上の温度における熱衝撃耐性をもち、許容可能なコストのセラミックを得るためには、アルミナマトリックス混成材料で強化されたアルミナが検討対象となるであろう。しかしながら、典型的なアルミナ繊維強化材は、α-アルミナから作られる。α-アルミナを用いたアルミナマトリックス混成材料の製造では、低い熱衝撃耐性で、マトリックスと強化材の結合が弱い材料しか作れない。α-アルミナは、ゲル化及び焼結時にマトリックスと有効な反応まったく起こすことがない。あたかも、本質的に「死期の近い」物質のようである。
1)低生産コスト。材料の合成及び成分の製造は、商業的に入手可能な原料を用いて行える。混成材料の熱工程は、大気中で行うことができる。減圧ファーネス、オートクレーブ、あるいは特殊なプロセスガスを用いる必要はない。
2)侵食耐性の向上。提案する材料は非侵食性であり、表面が硬化しており、硬化挿入の必要性を除去できる。
3)熱衝撃に対する優れた抵抗力。この材料は、現在知られているセラミックの上限温度と信じられている2,200Fをはるかに超える温度暴露への適用でも、熱衝撃に耐えられると思われる。
以下のとおり最初に酸化物ゾルが作られた。ゼロ点負荷(ZPC)9.1のアルミナが選択され、また、8.95ZPCのY2O3も選択された。このアルミナの供給源は、CATAPALブランドの分散アルミナである。200mgのアルミナを計量し、100mgをイオン除去水1,800mgに加え、酸化物を加える間マグネットスターラーで確実に攪拌する。攪拌中、酸化物/水混合物中にHNO3(65−70%検定)を徐々に加える。混合物のpHを測定し、硝酸を用いてpHが3から4になるまで滴定する。つぎに残り100mgのアルミナを加え、再び混合物のpHが3から4になるまで硝酸で滴定する。蒸発を最低限に押さえるよう系を確実に覆い、24時間攪拌する。24時間終了したら、攪拌機を止めて攪拌子をとり出し、このゾルを静かに24時間寝かせる。この間に目の粗い粒子塊が沈殿する。
や耐火レンガやライニング材であるが、多くを挙げることはしない。
Claims (16)
- 熱衝撃に起因するクラックを生じない繰り返し利用で2,200Fを超える温度に耐えることができるセラミック混成材料。
- 請求項1のセラミック混成材料で、
強化繊維の網とマトリックスを含み、マトリックスは焼結段階前において網に含浸させるアルミナゾルから形成され、焼結段階後にはマトリックスが網に確実に固定されているもの。 - 請求項2のセラミック混成材料で、その中で、
マトリックスがさらに少なくとも一つの希土類を含み、含浸ゾル中にも少なくとも一つの希土類酸化物を含有することで作るもの。 - 請求項2のセラミック混成材料で、その中で、
網が強化繊維の三次元直交織りから成るもの。 - 請求項2のセラミック混成材料で、その中で、
網が、焼結段階以前において遷移相アルミナを含むもの。 - 請求項5のセラミック混成材料で、その中で、
アルミナの遷移相がγ-アルミナであるもの。 - 請求項2のセラミック混成材料で、その中で、
焼結段階の後に、網が約10から40重量パーセントの混成材を含むもの。 - 請求項2のセラミック混成材料で、その中で、
混成材料が、第1及び第2金属及び遷移金属酸化物を基本的に含まないもの。 - 請求項1のセラミック混成材料で、その中で、
強化繊維が、含浸段階においてマトリックス製造に用いられるゾルによって部分的に吸収されるもの。 - 請求項9のセラミック混成材料で、その中で、
部分的吸収と焼結段階によって、網繊維にマイクロクラックが生じるもの。 - 請求項3のセラミック混成材料で、その中で、
「原料鉱石」状態の組成中に希土類酸化物が存在するもの。 - 請求項3のセラミック混成材料で、その中で、
希土類酸化物がゾル中に重量比約60%まで含むもの。 - 耐熱レンガで、
熱衝撃に起因するクラックを生じない繰り返し利用で2,200Fを超える温度に耐えることができるセラミック混成材料を含むもの。 - 請求項13の耐火レンガで、その中で、
セラミック混成材料が、強化繊維と網に強固に固着するアルミナマトリックスを含むもの。 - 燃料電池の断熱材で、
熱衝撃に起因するクラックを生じない繰り返し利用で2,200Fを超える温度に耐えることができるセラミック混成材料を含むもの。 - 請求項15の耐熱材で、その中で、
セラミック混成材料が、強化繊維の網に強固に固着するアルミナマトリックスを含み、且つ、セラミック混成材料が、第1及び第2金属及び遷移金属酸化物を基本的に含まないもの。
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US33273201P | 2001-11-19 | 2001-11-19 | |
PCT/US2002/037158 WO2003043954A1 (en) | 2001-11-19 | 2002-11-19 | Thermal shock resistant ceramic composites |
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EP (1) | EP1461299A4 (ja) |
JP (1) | JP2005509586A (ja) |
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AU2002343751A1 (en) | 2003-06-10 |
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US20070104935A1 (en) | 2007-05-10 |
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US20050008841A1 (en) | 2005-01-13 |
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