JP2018199588A - SiC/SiC複合材の製造方法 - Google Patents
SiC/SiC複合材の製造方法 Download PDFInfo
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- JP2018199588A JP2018199588A JP2017103988A JP2017103988A JP2018199588A JP 2018199588 A JP2018199588 A JP 2018199588A JP 2017103988 A JP2017103988 A JP 2017103988A JP 2017103988 A JP2017103988 A JP 2017103988A JP 2018199588 A JP2018199588 A JP 2018199588A
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Abstract
Description
(1)複数のSiC繊維を束ねたストランドからなる基材と、SiCマトリックスとからなるSiC/SiC複合材の製造方法であって、前記基材に鱗片状潤滑材の粒子を含むスラリーを含浸し含浸体を得る含浸工程と、前記含浸体から前記スラリーの溶媒を乾燥させる乾燥工程と、前記含浸体を屈曲し、前記鱗片状潤滑材の粒子を前記SiC繊維の表面に引き延ばしながら転写し、当該表面に界面層を形成する界面層形成工程と、前記界面層の形成された基材の内部にSiCマトリックスを形成するマトリックス形成工程と、を含む。
本発明のSiC/SiC複合材の製造方法は、複数のSiC繊維を束ねたストランドからなる基材と、SiCマトリックスとからなるSiC/SiC複合材の製造方法であって、前記基材に鱗片状潤滑材の粒子を含むスラリーを含浸し含浸体を得る含浸工程と、前記含浸体から前記スラリーの溶媒を乾燥させる乾燥工程と、前記含浸体を屈曲し、前記鱗片状潤滑材の粒子を前記SiC繊維の表面に引き延ばしながら転写し、当該表面に界面層を形成する界面層形成工程と、前記界面層の形成された基材の内部にSiCマトリックスを形成するマトリックス形成工程と、を含む。
バインダー樹脂としては特に限定されないが、ポリビニルアルコール、エポキシ樹脂、フェノール樹脂、でん粉、ピッチ、イソブチレン・マレイン酸共重合体、ポリ酢酸ビニル、ウレタン樹脂、ラテックスなどが利用できる。
洗浄工程で行う基材を変形させる操作は、洗浄しながらでもよいし、洗浄が終わってからでもよい。
<実施例1>
以下、本発明のSiC/SiC複合材の製造方法の実施例1について、図1(a)および図2を用いて説明する。
実施例1では、SiC繊維を束ねたストランドは、サイジング剤により1本に束ねられている。サイジング剤がSiC繊維どうしを密着しているため、それらを分離するため、織布を60℃の熱水に浸漬する。熱水に浸漬しながら織布を変形させ、SiC繊維同士を引き離すとともに、サイジング剤を熱水に溶解させ、SiC繊維の表面を露出させる。
次に、洗浄の済んだ織布を、鱗片状潤滑材として窒化ホウ素の粒子の分散したスラリーに浸漬し、窒化ホウ素の粒子をSiC繊維間に導入する。懸濁液の中で、SiCの織布を屈曲させ、SiC繊維の隙間に窒化ホウ素の粒子を行き渡らせる。なお、懸濁液は窒化ホウ素(h−BN)を、固形分0.03%となるよう分散している。使用したBNは、株式会社マルカ製、AP−170Sであった。なお一次粒子径は0.05μm、比表面積は170m2/gであった。
次に、スラリーの溶媒を乾燥させ、鱗片状潤滑材をSiC繊維の隙間に固定する。乾燥は、120℃の乾燥機で重量減少がなくなるまで十分に乾燥させるようにする。
SiC繊維の表面に付着した鱗片状潤滑材をSiC繊維の表面に転写する。織布を繰り返し表裏に屈曲することで、SiC繊維の表面に付着した鱗片状潤滑材が擦れ、SiC繊維の表面に付着し、薄い界面層を形成させる。このように屈曲させるので、織布の表面だけでなく、内部のSiC繊維にも界面層を形成することができる。
得られた筒状の基材をCVI炉に入れ、SiC繊維の隙間にSiCを気相成長させる。CVI(CVD)炉に入れ、気相成長させるために加熱する過程で、バインダー樹脂は熱分解し、炭素化する。このため、SiC繊維の周囲には、窒化ホウ素と炭素の混ざった薄い被膜が形成され、界面層となっている。また、SiCの繊維間には、界面層の上に気相成長したSiCが形成されている。
本発明のSiC/SiC複合材の製造方法の実施例2について、図1(b)および図3を用いて説明する。
表面に界面層の形成されたSiC繊維からなる織布が積層された基材に、炭素前駆体を含浸する。炭素前駆体は、フェノール樹脂を用い、基材に含浸した後、加熱して硬化させる。炭素前駆体は、さらに焼成することにより炭素化し、SiCマトリックスの炭素源となる。こうして、炭素源の含浸された基材に溶融シリコンを含浸させると、炭素源と反応し、反応焼結SiCのSiCマトリックスを得ることができる。
S2 含浸工程
S3 乾燥工程
S4 界面層形成工程
S5 マトリックス形成工程
Claims (5)
- 複数のSiC繊維を束ねたストランドからなる基材と、SiCマトリックスとからなるSiC/SiC複合材の製造方法であって、
前記基材に鱗片状潤滑材の粒子を含むスラリーを含浸し含浸体を得る含浸工程と、
前記含浸体から前記スラリーの溶媒を乾燥させる乾燥工程と、
前記含浸体を屈曲し、前記鱗片状潤滑材の粒子を前記SiC繊維の表面に引き延ばしながら転写し、当該表面に界面層を形成する界面層形成工程と、
前記界面層の形成された基材の内部にSiCマトリックスを形成するマトリックス形成工程と、
を含むSiC/SiC複合材の製造方法。 - 前記鱗片状潤滑材は、炭素または窒化ホウ素から選択される少なくとも一つの粒子からなる請求項1に記載のSiC/SiC複合材の製造方法。
- 前記スラリーは、さらにバインダー樹脂を含有する請求項1または2に記載のSiC/SiC複合材の製造方法。
- 前記マトリックス形成工程は、CVI法、PIP法またはMI法である請求項1から3のいずれか1項に記載のSiC/SiC複合材の製造方法。
- 前記含浸工程の前に、前記ストランドを洗浄する洗浄工程をさらに有する請求項1から4のいずれか1項に記載のSiC/SiC複合材の製造方法。
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JPH09268065A (ja) * | 1996-03-30 | 1997-10-14 | Toshiba Corp | 長繊維複合セラミックスおよびその製造方法 |
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