JP7582627B2 - セラミックス基複合材料とその製造方法 - Google Patents
セラミックス基複合材料とその製造方法 Download PDFInfo
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Description
(A)強化繊維により構成された繊維体に、前記マトリックスの一部となるセラミックス材料の粉末を含浸させ、
(B)前記粉末が含浸させられた前記繊維体を前記マトリックスの液体原料内に配置し、
(C)この状態で前記繊維体を加熱することにより、前記液体原料を膜沸騰状態にして、前記液体原料に由来するセラミックスを前記マトリックスの一部として前記繊維体内に生じさせる。
あるいは、ステップS1で用いる粉末を構成する粒子の粒径(粉末全体の70%以上、80%、又は90%以上の粒子の粒径)は、1μm以上であって20μm以下であってよい。また、ステップS1で用いる粉末は、1種類の粒径の粒子からなるものであってもよいし、複数種類の粒径の粒子からなるものであってもよい。前者の場合、ステップS1で用いる粉末は、主に(粉末全体の70%以上、80%、又は90%以上が)、粒径が5μm程度(例えば3μm以上7μm以下)の粒子からなっていてよい。後者の場合、ステップS1で用いる粉末は、主に(粉末全体の70%以上、80%、又は90%以上が)、粒径が5μm程度(例えば3μm以上7μm以下)の粒子と、粒径が17μm程度(15μm以上19μm以下)の粒子とからなっていてよい。また、後者の場合、粒径が5μm程度の粒子と、粒径が17μm程度の粒子の各々は、ステップS1で用いる粉末の40%以上を占めていてよい。
なお、各粒子の粒径(さしわたし)は、当該粒子の最大寸法(各方向の寸法のうちの最大値)を意味してよい。
本実施形態の実施例1では、繊維体を、強化繊維としてのSiC繊維(炭化ケイ素繊維)で形成されたものとし、液体原料を上述のLPCSとした。また、図2A~図2Cと図3に示す構成を用いて、上述の図1のフローチャートに示す処理を行った。
実施例2では、ステップS1で用いるセラミックス材料の粉末の粒径を複数の値に変えて、図1に示すフローチャートに示す処理を行った。図8は、実施例2の結果を示す表である。
上述のステップS1で用いた粉末は、炭化ケイ素の粉末であったが他のセラミックス材料の粉末であってもよい。
上述のステップS3において、ステップS32を行わずに、ステップS31を行ってもよい。この場合、ステップS31において、繊維体の温度が高温側の目標温度以上になるまで、繊維体を加熱し、所定時間、繊維体の温度を当該目標温度以上に保つ。この所定時間は、例えば、6時間以上20時間以内であってよい。
上述において、加熱体1を省略して、ステップS31では、熱容量(体積)が十分に大きい、粉末が含浸させられた繊維体(例えば炭素繊維又は炭化ケイ素繊維により形成された繊維体)を誘導加熱することにより、上述の膜沸騰ガスを発生させて、上記(i)と(ii)の一方又は両方により、セラミックス基複合材料のマトリックスの気孔においてセラミックスを堆積させてもよい。この場合、例えば、図2Aと図3において、加熱体1が省略され、セラミックス基複合材料10の数が1つになり、1つのセラミックス基複合材料10が上方と下方から多孔体3に接触し、断熱材5は、セラミックス基複合材料10の外周10aを覆い、他の点は、上述と同じであってよい。また、加熱体1の省略に加えて、又は加熱体1の省略の代わりに、断熱板2を省略してもよい。
Claims (10)
- マトリックスと、前記マトリックス内に設けられた強化繊維とを備えるセラミックス基複合材料の製造方法であって、
(A)強化繊維により構成された繊維体に、前記マトリックスの一部となるセラミックス材料の粉末を含浸させることにより、前記繊維体内の気孔を細分化し、
(B)前記粉末が含浸させられた前記繊維体を前記マトリックスの液体原料内に配置し、
(C)この状態で前記繊維体を加熱することにより、前記液体原料を膜沸騰状態にして、前記液体原料に由来するセラミックスを、前記繊維体内において前記(A)で細分化された前記気孔内に、前記マトリックスの一部として生じさせる、セラミックス基複合材料の製造方法。 - 前記(C)では、
(C1)前記繊維体を加熱することにより、前記液体原料を前記膜沸騰状態にして、前記セラミックスを前記繊維体内に生じさせ、
(C2)前記繊維体を前記液体原料の沸点より低い温度まで冷却し、
前記(C1)と前記(C2)を繰り返す、請求項1に記載のセラミックス基複合材料の製造方法。 - 前記(C1)と前記(C2)を繰り返す過程で、前記(C1)において前記繊維体の温度が高温側の目標温度以上になったら、前記繊維体の加熱を停止することにより前記(C2)を行う、請求項2に記載のセラミックス基複合材料の製造方法。
- 前記(A)では、
(A1)前記粉末を液体と混合することによりスラリーを生成し、
(A2)スラリー容器内で前記スラリー内に前記繊維体が埋まった状態にし、
(A3)前記スラリー容器の内部を真空引きして、前記粉末を含有する前記スラリーを前記繊維体の内部に含浸させる、請求項1~3のいずれか一項に記載のセラミックス基複合材料の製造方法。 - 前記(A)で用いる前記粉末のメディアン径は、1μm以上20μm以下である、請求項1~4のいずれか一項に記載のセラミックス基複合材料の製造方法。
- 前記(A)で用いる前記粉末は、メディアン径が5μmの粉末と、メディアン径が17μmの粉末との混合粉末である、請求項1~5のいずれか一項に記載のセラミックス基複合材料の製造方法。
- 前記(B)では、前記液体原料を保持する処理容器の内部において、前記繊維体と加熱体を配置し、
前記(C)では、前記加熱体を誘導加熱することにより、前記繊維体を加熱する、請求項1~6のいずれか一項に記載のセラミックス基複合材料の製造方法。 - 前記(C)では、前記処理容器の外部に配置したコイルに交流電流を流すことで当該コイルが発生する交流磁場により、前記加熱体を誘導加熱し、誘導加熱された前記加熱体により前記繊維体を加熱し、
前記処理容器は、非導電性材料により形成されている、請求項7に記載のセラミックス基複合材料の製造方法。 - マトリックスと、前記マトリックス内に設けられた強化繊維とを備えるセラミックス基複合材料の製造方法であって、
(A)強化繊維により構成された繊維体に、前記マトリックスの一部となるセラミックス材料の粉末を含浸させ、
(B)前記粉末が含浸させられた前記繊維体を前記マトリックスの液体原料内に配置し、
(C)この状態で前記繊維体を加熱することにより、前記液体原料を膜沸騰状態にして、前記液体原料に由来するセラミックスを前記マトリックスの一部として前記繊維体内に生じさせ、
前記(B)では、前記液体原料を保持する処理容器の内部において、前記繊維体と加熱体を配置し、
前記(C)では、前記加熱体を誘導加熱することにより、前記繊維体を加熱し、
前記(C)では、取付具により、前記繊維体は前記加熱体に取り付けられており、前記取付具と前記繊維体と前記加熱体が、前記処理容器の内面に接触しないように吊り下げられている、セラミックス基複合材料の製造方法。 - 請求項1~9のいずれか一項に記載のセラミックス基複合材料の製造方法により製造されたセラミックス基複合材料。
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