成果報告書詳細
管理番号20110000001148
タイトル*平成22年度中間年報 ナノテク・先端部材実用化研究開発/新幹線用ハイブリッドセラミックスディスクブレーキ部材開発(2)
公開日2011/9/9
報告書年度2010 - 2010
委託先名独立行政法人物質・材料研究機構
プロジェクト番号P05023
部署名電子・材料・ナノテクノロジー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 炭素繊維成形体の作製はハイブリッドセラミックディスクブレーキ部材開発の重要な一環であり、ハイブリッドセラミックスブレーキディスク部材の保障を左右する技術でもある。また、炭素繊維/SiCハイブリッドセラミックスディスクブレーキの信頼性を保障するために、繊維成形体となる炭素繊維と含浸時溶融Siとの反応を抑制して破壊時繊維の架橋効果を発揮することが不可欠である。
英文要約In order to obtain the Cf/SiC hybrid materials with high performance, the reaction between carbon fiber and melting silicon must be prevented when melting silicon infiltrated into fibers preform at high temperature during fabrication. In 2010 year, we have been investigated effects of SiC powder added to the fiber perform on the reaction of carbon fiber with melting silicon as well as to explore effects of SiC powder added on the mechanical properties of the obtained Cf/SiC hybrid materials. In addition, in order to further prevent the reaction between carbon fiber and melting silicon, Fe was added to melting silicon during the infiltration. The effect of Fe addition on the reaction of carbon fiber with melting silicon was explored and the effect on the mechanical properties of the obtained Cf/SiC hybrid materials was investigated as well.
The short carbon fiber-preform had been fabricated, by warm-pressing the dried-mixed SiC, phenolic resin, and short carbon fibers mixtures. Four compositions carbon fiber preforms with different SiC:C ratio (SiC:C=0; 3:7; 5:5; 7:3) were prepared. Then, these carbon fiber preforms were infiltrated by melting silicon and silicon-iron alloys at 1450oC or above in vacuum for obtaining the Cf/SiC hybrid materials. The microstructural observations of the obtained Cf/SiC hybrid materials showed that the C+SiC mixture presented surrounding carbon fiber bundles which prevented the reaction of melting silicon with carbon fibers. In addition, SiC formed due to melting silicon with carbon was observed between carbon fibers bundles, and the residual silicon was presented as well. On the other hand, for Si-Fe-infiltrated Cf/SiC hybrid materials, the reaction of melting silicon with carbon fiber was further inhibited, as a result of reduction of reaction activity of Si resulting from the presence of Fe. Fe existed in form of a FeSi compound in the obtained Cf/SiC hybrid materials.
The mechanical properties of the Cf/SiC hybrid materials were examined at room temperature. The Cf/SiC hybrid materials showed a noncatastrophic failure behavior. The addition of SiC particles to fiber preform increased resistance to fracture of the materials. When SiC/C ratio exceeded unit, in particular, the resistance to fracture was significantly increased, as a result of the inhibition of reaction between melting Si and carbon fiber. This increase enhanced with SiC added. In addition, the addition of Fe to melting Si further increased the resistance to failure, and this increase was enhanced with increase of SiC particles in the fiber preform. However, the flexural strength degraded accompanying with addition of SiC to fiber preform as well as with addition of Fe to melting silicon. The SEM observations of fracture surface showed the presence of pull-out fibers, indicating the occurrence of the interface debonding and fiber bridging during fracture, therefore high resistance to fracture.
In summary, the addition of SiC particles in fiber preform and the addition of Fe in melting Si are effective for inhibiting reaction of Si with carbon fibers, therefore preserving fibers during fabrication processing.
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