成果報告書詳細
管理番号20110000000535
タイトル*平成22年度中間年報 水素先端科学基礎研究事業 水素先端科学基礎研究 水素雰囲気下におけるゴム材料の研究
公開日2011/6/23
報告書年度2010 - 2010
委託先名NOK株式会社
プロジェクト番号P06026
部署名新エネルギー部
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 水素エネルギー社会実現のために,燃料電池などの水素利用技術の向上だけではなく,水素を安心して使うための安全性や信頼性を確保することが要求される.水素機器のガスシール部品としては一般的にゴムOリングが使用されるが,特に高圧ガスシールに用いられるゴム材料には、水素ガスに限らず高圧ガスを減圧した際にゴム内部の破壊が発生することがある.この現象はブリスタ破壊と呼ばれ、ゴム材料を激しく損傷させる.その破壊状態はゴム材料の種類や圧力差,減圧速度などの使用環境条件,さらにはシール設計の影響を受けることが知られている.
英文要約itle: “Fundamental Research Project on Advanced Hydrogen Science”
FY2010 Annual Report from FY2010 to FY2012
It is necessary to develop the hydrogen industrial use and safe technology for the hydrogen energy society realization. The fracture by blistering is generated by the rapid decompression of high-pressure hydrogen gas in sealing rubbers. We collaborated to make a study on sealing technology of rubber materials for high-pressure hydrogen gas with Kyushu University. The main content of execution in FY2010 is as follows:
(1) O-ring grand design applied for high pressure hydrogen.
Fractures of rubber O-ring by high-pressure hydrogen gas are classified as blistering, overflow and buckling fracture. The blistering fracture is originated from rubber strength and hydrogen solubility and the overflow and buckling fracture are generated from swelling of rubber by hydrogen gas. Swelling is considerable large under especially serious condition as pressurized up to 70 MPa at 100 degree C. Fracture behavior of O-ring depends on gland design. To keep sealing reliability for a long term, grand design applied for high-pressure hydrogen is considerable for swelling. In this study, the gland design for hydrogen equipment with ethylene-propylene rubber (EPDM) O-rings was evaluated. As a result, available design depends on the rubber composites, then carbon black filled rubber can adapt to wider range of grand design.
(2) Hydrogen gas permeation behavior through rubber O-ring.
It was clarified that the kind of the sealing rubbers was the highest sensitivity factor for their fracture and increase gas leakage in our previous studies using quality engineering approach. The increase in the gas leakage was also strongly related to gas permeability of the rubbers. In this study, we evaluated the hydrogen gas permeability of several sealing rubbers under high-pressure hydrogen gas by using a high pressure durability tester; then, their hydrogen gas permeability and diffusivity were analyzed in terms of ambient temperature and hydrogen pressure.
(3) Visualizing evaluation on blister generating behavior inside of rubber O-ring.
However the blistering was reproduced by rapid gas decompression, the generation of initial crack and initiation were not able to be evaluated easily. In this study, we evaluated the in-situ optical microscopic observation of blister behavior of rubber O-ring during pressurization and rapid or slow decompression in terms of transparent rubber material under 10MPa gas pressure.
As a result, slow decompression rate is considered to be effective for blister initiation. In EPDM O-ring, the large-sized-bubbles are occurred, while in VMQ O-ring, the micro-sized-bubbles are observed. It is estimated that the blister initiation behavior is different from kind of rubber material and kind of gas and does not occur easily in rubber with high diffusion speed property due to gas molecules are dissolved easily inside of rubber O-ring.
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