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SiC–SiCf CMC manufacturing by hybrid CVI–PIP techniques: process optimisation

A Ortona, A Donato, G Filacchioni, U De Angelis, J Yeatman2000年Fusion Engineering and DesignIF 1.7出版社

AbstractSiC–SiCf ceramic matrix composites (CMC) are candidate structural material for fusion power reactor applications because of their favourable thermo-mechanical and low-activation properties. Among their different manufacturing techniques, present, the most employed ones are chemical vapour infiltration (CVI) and polymer infiltration and pyrolysis (PIP). These two techniques are based on the common principle of filling the porosity among the fibres with SiC resulting from precursor decomposition. CVI process deposits high purity crystalline SiC with good properties onto fibres whereas PIP leaves lower characteristic amorphous SiC with traces of oxygen between fibres. PIP, on the other hand, seems to be much more industrially effective than CVI. In the attempt to maximise the properties and reduce costs, some work has been done on the so called ‘hybrid techniques’ in which CVI and PIP are both employed. The work performed by ENEA and FN S.p.A. consists of a series of combined CVI–PIP process cycles and the subsequent product characterisation.

日本語訳

SiC–SiCセラミックマトリックス複合材料は、その好ましい熱機械的特性と低放射化特性により、核融合炉の構造材料の候補材料である。それらの異なる製造技術の中で、現在最も広く用いられているものは、化学蒸気含浸(CVI)とポリマー含浸熱分解(PIP)である。これらの2つの技術は、前駆体の分解に由来するSiCを繊維間の気孔に充填するという共通の原理に基づいている。CVIプロセスは、高純度の結晶性SiCを繊維上に堆積させ、良好な特性を付与するのに対し、PIPは、繊維間に酸素を微量含む低特性の非晶質SiCを残す。一方、PIPはCVIよりも工業的にはるかに効率的であると思われる。特性を最大化しコストを低減する試みとして、CVIとPIPの両方を併用するいわゆる「ハイブリッド技術」に関する研究がいくつかなされている。ENEAおよびFN S.p.A.によって実施された研究は、CVI–PIPの複合サイクルとその後の生成物の特性評価から構成されている。

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