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成果報告書詳細
管理番号20170000000166
タイトル*平成28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2017/4/20
報告書年度2016 - 2016
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) FY2016 Annual Report

(1) Development of Production Technology of SiC Fiber
We investigated the decomposition of raw fiber, grain growth and sintering process on fabrication process of the SiC fiber, and mainly scientifically analyzed “chemical composition”, “emission gas”, and “SiC grain size”, respectively. And we cleared the key parameters for the each process to produce the SiC fiber with stable properties. Furthermore, we classified the defects as ‘internal defect’ excited in the inside of fiber and as ‘surface defect’ excited on the surface of fiber from investigating the defects in the SiC fiber, and cleared the process parameters for reducing the those defects. We found that the surface defect has greater effect on the fiber strength. The surface defect can be reduced by the optimizing the sintering temperature, and the internal defect can be reduced by the optimizing the process condition for the decomposition of raw fiber. We significantly improved the average strength of the SiC fiber from 2.8 GPa to 3.0 GPa by reducing the those defects.
We found the optimization conditions (temperature profile, treatment temperature and time for optimized sintering structure of the SiC fiber, etc). Then we designed the trial facility precisely, settled and conducted the test run of the trial facility. Now it is possible to produce the SiC fiber with 2.0 GPa strength and surface roughness Ra 2-3 nm stably by about 200 kg /year scale.
Based on the findings of the batch process, we investigated the continuous sintering process. We applied the important parameters such as temperature increase speed, and heat treatment temperature and time of the batch sintering furnace to the continuous sintering furnace conditions. Then we conducted the trial fabrication of the SiC fiber using the continuous sintering furnace. The fabricated SiC fiber possesses similar sintering structure of the batch processed SiC fiber, and we confirmed the SiC fiber strength over 2.0 GPa.

(2) Development of high performance SiC fiber
We investigated the relationship between the sintering additives (B, Al) in the precursor polymer of the SiC finer and mechanical properties of the SiC fiber, and founded the proper amount of the sintering additives which achieved the coexistence of high strength and high creep property of the SiC fiber. Furthermore, we conducted the basic research of the molecular weight and structure of the precursor polymer containing proper amount of sintering additives which is suitable for the spinning.
We founded that the BSR method is applicable for the measurement of the high temperature creep properties of the SiC fiber with satisfied repeatability. This method is relatively simple method and useful for comparative evaluation of the creep properties of the SiC fiber. We are also developing the high temperature tensile creep testing method.
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