成果報告書詳細
管理番号20110000001280
タイトル平成22年度成果報告書 戦略的国際標準化推進事業 標準化先導研究 固体酸化物燃料電池セル用セラミックス材料の特性試験方法に関する標準化
公開日2011/7/28
報告書年度2010 - 2010
委託先名国立大学法人愛媛大学
プロジェクト番号P04002
部署名技術開発推進部
和文要約本調査研究では,固体酸化物燃料電池(SOFC)の燃料電池セルに使用されるセラミックス材料単体または積層材(接合体)の微構造・機械的特性・熱特性等の特性評価に関して,標準化すべき評価項目及び評価方法についてフィージビリティスタディを行った.その内容は以下の通りである.
(1)ニーズ調査の実施
既存のISO,JIS規格について,SOFC用セラミックス材料の特性評価に適用可能な規格の有無を調査した.その結果,適用可能な規格は次の通りである.微構造では,SEM観察のための試料調製方法,グレインサイズ測定法であった.機械的特性では,破壊靭性試験,ビッカース硬さ,データのワイブル統計解析法であった.熱特性では,比熱容量測定法であった.しかしながら,既存のISO,JIS規格では不十分で有ることが判った.
一方,SOFC用部材のセラミックスメーカーおよびSOFCメーカーにおいて,どの様な微構造・熱特性・機械的特性等の性能評価が行われ,また,求められるかについてニーズ調査を行った.その結果,微構造では電極のガス透過率,機械的特性では,薄板状セラミックスの強度評価のニーズが有ることが判った.
(2)特性試験方法の検討
 電極のガス透過率の試験方法,課題,機械的特性では,薄板状セラミックスの強度評価としてRing-on-Ring試験,Small Punch試験を候補として検討した.また,いずれも室温,高温・雰囲気中の試験方法とステップを踏んで標準化を検討することとした.
(3)標準化調査
 欧州の専門家を訪問し,SOFC用セラミックス材料の評価状況について調査を行った.その結果,調査先では,SOFC材料や部品の試験としては,ロールスロイスやジーメンス等と共同研究を実施しており,セルのRing-on-Ring曲げ試験や,Double Torsion試験などを行った経験があった.試験温度は室温から900℃程度であり,試験雰囲気の制御は,必要性は有ったが,実施されていなかった.また,セルの形状によって試験すべき項目が異なること,SOFC用材料の特性は,必ずしも単体で測定したときと同じではないこと等が示された.
 一方,国内のSOFC用セラミックスメーカー,ユーザーを訪問し,実際にどの様な特性評価が行われ,標準化が望まれているかの調査も実施した.
(4)特許調査
SOFC用セラミックス積層構造体(接合体)の性能評価法に関する調査を行った.特許検索で抽出された特許は,既存の評価方法に関連した特許で有り,今後の標準化に関連した特許は抽出されなかった.
英文要約In this research, a feasibility study is conducted into the evaluation items and evaluation methods that should be standardized for the micro-structures, mechanical properties and thermal properties of the single-unit or laminated ceramic materials that are used in solid oxide fuel cells (SOFC). The following describes the contents of this study.
(1) Implementation of an Investigation of Needs: In regards to the existing ISO and JIS standards, an investigation was conducted into the standards that could be applied to the evaluation of the characteristics of ceramic materials for SOFC. The following are the standards that were have the potential of being applied. For micro-structures, there were the sample preparation method for SEM observation and the grain size measuring method. For mechanical properties, there were the fracture toughness test, the Vickers hardness and the Weibull statistical analysis method for data. For thermal properties, there was the specific heat capacity measurement method. However, it was determined that the existing ISO and JIS standard are insufficient. On the other hand, we investigated the needs of the ceramic manufacturers who make SOFC materials and SOFC manufactures and asked how they were conduction performance evaluations of micro-structure, thermal and mechanical properties and what they were looking for. Based on this, it was determined that there is a need to evaluate the transmittance of electrodes for microstructures and the strength of thin sheet ceramics in the area of mechanical properties.
(2) Investigation into the Test Methods for Properties: In the area of the transmittance of electrodes, issues and mechanical properties, the ring-on-ring test and small punch were investigated as candidates for evaluating the strength of thin sheet ceramics. In addition, the test methods for both at room temperature and high temperature atmospheres and steps were taken and investigated for standardization.
(3) Investigation of Standardization: We visited experts in Europe and the current state of the evaluation of ceramic materials for SOFC was investigated. The results of this investigation revealed that the cell ring-on-ring bend test, double torsion test and others were being conducted as tests for SOFC materials and parts as joint research by Rolls Royce, Siemens and others. Tests were conducted in temperatures from room temperature to 900°C an while there was a need for controlling the test atmosphere, it was not implemented. Moreover, it was indicated that the test items that should be conducted will vary according to the shape of the cell, and that the properties of materials for SOFC are not necessarily the same as they were at the time they were measured. On the other hand, users and SOFC ceramic manufacturers in Japan were visited and they were asked what types of property evaluations they actually conducted and whether or not they desired standardization.
(4) Investigation of Patents: An investigation relating to the evaluation of the performance of ceramic laminate structures for SOFC was conducted. Of the patents that were extracted by a patent search, there were patents relating to existing evaluation methods, but the search revealed no patents that were related to future standardization.
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