JP4591913B2 - 繊維強化耐熱吸音材とその製造方法 - Google Patents
繊維強化耐熱吸音材とその製造方法 Download PDFInfo
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Description
しかし、高温高速の排気ガスにさらされると多孔質セラミックスが損耗してしまい機能を果たさなくなる。
また、一般的なグラスウールは耐熱性が低く(300℃以下)、特許文献1〜3の吸音材は、耐熱性は高いが、広帯域の吸音性能が安定して得られず、高温高速の排気ガスにより損耗しやすく、重量が重いという問題があった。
95%以上の気孔率を有し、かつ1000〜4000Hzにおいて95%以上の騒音吸収率を有する繊維強化耐熱吸音材を製造する、ことを特徴とする繊維強化耐熱吸音材の製造方法が提供される。
この構成及び方法により、ジェット騒音の低減に必要となる広帯域の騒音(例えば1000〜4000Hz)において、高い騒音吸収率が得られ、かつ軽量化できることが、実施例により確認された。
ゾルゲル溶液調製ステップS2では、1000℃以上の耐熱性を有する耐熱性化合物3を含むゾルゲル溶液4を調製する。
含浸・乾燥・仮焼ステップS3では、前記繊維成形体2にゾルゲル溶液4を含浸、乾燥、仮焼する。この含浸・乾燥・仮焼ステップにおいて、嵩密度が0.07g/cm3以上、0.11g/cm3以下に達するまで、含浸、乾燥、仮焼を繰り返すのがよい。
結晶化ステップS4では、含浸、乾燥、仮焼した繊維成形体5を結晶化処理して繊維強化耐熱吸音材6を完成する。
また、この炭化ケイ素系繊維1は、密度が2.7〜3.2/cm3であり、重量割合で、Si:50〜70%、C:28〜45%、Al:0.06〜3.8%及びB:0.06%〜0.5%からなり、SiCの焼結構造からなる結晶性炭化ケイ素系繊維であるのがよい。
このようなBaO・Al2O3・SiO2・MgO系酸化物は、登録商標「BMAS」として宇部興産株式会社から市販されており、約1500℃の高温に耐え、かつ液相法で調製できる化合物であることが確認されている。
成形体形成ステップS1において、チラノ繊維ZMIグレード(Si-Zr-C-O繊維)を用いフェルト状の繊維成形体2を調製した。フェルト状の繊維成形体2は、この例では繊維径14ミクロン、繊維長50mmの短繊維(チョップ)をランダムに積層し加圧して所定の気孔率(嵩密度)に成形した。嵩密度はフェルト状成形体の体積と重量からもとめ、気孔率は、嵩密度/構成材料の真密度×100%の式から求めた。なお、本発明において、繊維成形体の成形手段は、特に制限されず、連続繊維でフェルトを製造するメルトブローンなどの手段を用いることもできる。
ゾルゲル溶液調製ステップS2では、BMAS生成用のゾル・ゲル溶液4を調製する。BMASは、宇部興産株式会社から市販されているBaO・Al2O3・SiO2・MgO系酸化物であり、組成はBaMg2Al6Si9O30で示され、鉱物名はバリウムオオスミライトである。
金属バリウム(Ba)、
エトキシマグネシウム(Mg(OC2H5)2)、
アルミニウムイソプロポキシド(Al(O・C3H7)3)、
テトラエトキシシラン(Si(OC2H5)4)、
イソプロピルアルコール(CH3CH(OH)CH3)、
アセチルアセトン(CH3COCH2COCH3)
この溶液を乾燥後、1250℃−1時間大気中で焼成すると白色の粉末が得られた。この粉末をX線回折で調べたところ、バリウムオオスミライトの結晶が析出していることが確認された。
含浸・乾燥・仮焼ステップS3において、上記のゾルゲル溶液4に、所定の大きさに切断したフェルト状の繊維成形体2を含浸し、真空脱気し繊維成形体中に溶液を十分浸透させた。溶液から取り出した繊維成形体は、不要な溶液を除去できるような棚板の上で20分間静置した。不要な溶液を十分に除去した繊維成形体は、80℃−8時間乾燥器で乾燥させ、500℃−30分大気中で仮焼を行った。含浸、乾燥、仮焼の操作を、目的の嵩密度に到達するまで繰り返した。
この試験では、嵩密度が低密度の低嵩密度品(0.07〜0.08g/cm3)と高密度の高嵩密度品(0.11g/cm3)の2種類を作製した。繰り返し回数は、低密度の場合は、2回繰り返し、高密度の場合は、8回繰り返した。
所定回数の含浸、乾燥、仮焼処理を完了した試料は、結晶化ステップS4において1250℃−1時間窒素中で結晶化処理を行った。焼成終了後、必要サイズに加工して最終製品とした。
・高嵩密度品:チラノ:BMAS=0.53:0.47
・低嵩密度品:チラノ:BMAS=0.82〜0.9 :0.18〜0.1
また完成した繊維強化耐熱吸音材の気孔率は、
・高嵩密度品:0.96、低嵩密度品:0.97であった。
上述した嵩密度の異なる2種類の繊維強化耐熱吸音材6について熱衝撃前後の吸音率、寸法および重量を計測した。
熱衝撃サイクルとして、熱衝撃サイクル数:60サイクル、1サイクルあたりの時間:75分、最高定常温度/時間:610K(337℃)/35分、最高温度までの加熱時間:20分で行った
また、耐熱衝撃試験後の試料については、試験前後の寸法および重量変化を測定することで気孔形状変化の有無の目安とした。
図4、図5から、熱衝撃試験前後の垂直入射吸音率はほとんど同じであり、熱衝撃による性能低下はほとんどないことがわかる。また、図6との比較から、ジェット騒音の低減に必要となる1000〜4000Hzにおいて、従来より高い約95%以上の騒音吸収率が安定して得られていることがわかる。
嵩密度の異なる2種類の繊維強化耐熱吸音材6について評価した。この試験では、灯油を試験片に十分浸透させ、簀の子の上で余分な灯油を除去し、サンプルとした。次いで、試験片にライターで着火し、燃え尽きたところで調査を完了し、試験片を回収した。試験片は、燃焼試験前後の重量を測定した。なお、火炎温度は約1700℃であった。
4 ゾルゲル溶液、5 繊維成形体、6 繊維強化耐熱吸音材
Claims (8)
- 1000℃以上の耐熱性を有する炭化ケイ素系繊維の短繊維からなる繊維成形体と、1000℃以上の耐熱性を有し前記繊維表面にコーティングされた耐熱性化合物とからなり、95%以上の気孔率を有し、かつ1000〜4000Hzにおいて95%以上の騒音吸収率を有する、ことを特徴とする繊維強化耐熱吸音材。
- 嵩密度が0.07g/cm3以上、0.11g/cm3以下である、ことを特徴とする 請求項1に記載の繊維強化耐熱吸音材。
- 前記炭化ケイ素系繊維は、2族、3族及び4族の金属原子からなる群から選択され、その酸化物の炭素還元反応における自由エネルギー変化が負の値になる温度が、酸化ケイ素の炭素還元反応における自由エネルギー変化が負になる温度に比較して高温である金属元素を含有し、かつ酸素含有量が1〜13重量%の範囲内である、ことを特徴とする 請求項1に記載の繊維強化耐熱吸音材。
- 前記耐熱性化合物は、BaMg2Al6Si9O30で示されるBaO・Al2O3・SiO2・MgO系酸化物である、ことを特徴とする 請求項1に記載の繊維強化耐熱吸音材。
- 1000℃以上の耐熱性を有する炭化ケイ素系繊維の短繊維から繊維成形体を形成する成形体形成ステップと、1000℃以上の耐熱性を有する耐熱性化合物を含むゾルゲル溶液を調製するゾルゲル溶液調製ステップと、前記繊維成形体にゾルゲル溶液を含浸、乾燥、仮焼する含浸・乾燥・仮焼ステップと、含浸、乾燥、仮焼した繊維成形体を結晶化処理する結晶化ステップとからなり、
95%以上の気孔率を有し、かつ1000〜4000Hzにおいて95%以上の騒音吸収率を有する繊維強化耐熱吸音材を製造する、ことを特徴とする繊維強化耐熱吸音材の製造方法。 - 前記含浸・乾燥・仮焼ステップにおいて、嵩密度が0.07g/cm3以上、0.11g/cm3以下に達するまで、含浸、乾燥、仮焼を繰り返す、ことを特徴とする請求項5に記載の繊維強化耐熱吸音材の製造方法。
- 前記炭化ケイ素系繊維は、2族、3族及び4族の金属原子からなる群から選択され、その酸化物の炭素還元反応における自由エネルギー変化が負の値になる温度が、酸化ケイ素の炭素還元反応における自由エネルギー変化が負になる温度に比較して高温である金属元素を含有し、かつ酸素含有量が1〜13重量%の範囲内である、ことを特徴とする請求項5に記載の繊維強化耐熱吸音材の製造方法。
- 前記ゾルゲル溶液は、結晶化処理することによりバリウムオオスミライトの結晶を析出するに必要な量比で、Ba,Al,Si,Mgイオンまたはこれらの元素を構造中に含有する分子や錯イオンが溶解あるいは分散した溶液である、ことを特徴とする 請求項5に記載の繊維強化耐熱吸音材の製造方法。
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EP20050719239 EP1736458B1 (en) | 2004-04-13 | 2005-02-17 | Fiber-reinforced heat-resistant sound-absorbing material and process for producing the same |
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US10/599,281 US7829479B2 (en) | 2004-04-13 | 2005-02-17 | Fiber-reinforced heat-resistant sound-absorbing material and process for producing the same |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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LAPS | Cancellation because of no payment of annual fees |