成果報告書詳細
管理番号20160000000717
タイトル*平成27年度中間年報 次世代構造部材創製・加工技術開発 研究開発項目(4)ー2 軽量耐熱複合材CMC技術開発(高性能材料開発) その3
公開日2016/9/28
報告書年度2015 - 2015
委託先名宇部興産株式会社
プロジェクト番号P15006
部署名材料・ナノテクノロジー部
和文要約
英文要約Title : Development of CMC technologies of lightweight and heat-resistant composite materials (FY2015-FY2017) FY2015 Annual Report

(1) Development of Production Technology of SiC Fiber. The Investigation of factors of defects excited in the SiC fiber was conducted to reduce the variation of the properties of SiC fiber, furthermore, taking measures for reducing each defect were planned. The defects were classified as ‘internal defect’ excited in the inside of fiber and as ‘surface defect’ excited in the surface of fiber. It is cleared that the surface defect has greater effect on the fiber strength. The surface defect can be reduced by the controlling the sintering condition. To establish the most optimum sintering condition to fabricate the SiC fiber which has over 2 GPa tensile strength and surface roughness Ra 2-3 nm stably, pyrolysis of raw fiber, grain growth and sintering process on the SiC fiber fabrication process were scientifically investigated mainly through ‘chemical composition’, ‘composition of emitting gas’ and ‘crystal size of SiC’. The key parameters were identified for obtaining the SiC fiber with stable properties. Based on these findings, the detailed design was carried out for the pilot production equipment which produces about 200 kg/y of SiC fiber. To understand of the basic SiC fiber properties such as friction abrasion and winding property, the test method and the test equipment were established, and these properties were basically grasped. It is cleared that it is necessary to pay attention particularly to winding parts for fabricating the three dimensional preform using the SiC fiber. It is indicated that optimizing the fiber reinforcing method, and developing the fabric structure fitting the SiC fiber and specialized fabrication method were necessary. The trials and evaluations of BN coating on the SiC fiber using BN coating equipment were conducted and the task was extracted. The fiber breakage or fluffing was observed under some trials. Thus, modification of the coating condition for stable interface coating needs to be conducted. The strength of the BN coated SiC fiber was not degraded. Thus, the effect of thermal degradation during the BN coating process can be ignored. Furthermore, it was found that the proper BN thickness was formed for CMC with expected strength. As for forming the matrix, the SPI process which consists of coating BN or C on the fiber interface of fabric by CVD/CVI method and introducing grass for crack sealing, and the PIP process which consists of introducing polycarbosilane that is the precursor of SiC were developed. Furthermore, C interface by CVI process and SiC layer by CVD process were also examined. (2) Development of High Performance SiC Fiber. The relation between the amount of sintering aids (B, Al) in the SiC precursor polymer and the properties of the SiC fiber were investigated. It was cleared that the amount of Al has a strong effect on the high temperature creep properties of the SiC fiber, and there was strong correlation between the amount of Al and the high temperature creep properties of the SiC fiber.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る