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Mechanical properties and deformation of polycrystalline lithium orthosilicate

K. Bär, C.Y. Chu, J.P. Singh, K.C. Goretta, R.B. Poeppel1989年Fusion Engineering and DesignIF 1.7出版社

Room-temperature strength, fracture toughness, Young's modulus, and thermal-shock resistance were determined for 68 to 98% dense lithium orthosilicate (Li4SiO4) specimens. In the low-density regime, both strength and fracture thoughness were controlled by the density of the specimen. At high density, the strength depends on grain size. Young's modulus values ranged from 30 to 103 GPa at densities between 68 and 98% TD. A critical quenching temperature difference in the range of 150–170 °C was observed in thermal-shock tests of bar specimens. Steady-state creep tests indicated that 90% dense Li4SiO4 fractures at T ≤ 800 °C before reaching steady state and deforms plastically at 900 °C. It is more creep-resistant at 900 °C than Li2O, about equal to Li2ZrO3, and less than LiAlO2.

日本語訳

室温における曲げ強度、破壊靭性、ヤング率、および熱衝撃抵抗を、相対密度68~98%のリチウムオルソケイ酸塩(Li4SiO4)試験片について測定した。低密度領域では、曲げ強度と破壊靭性はともに試験片の密度に支配された。高密度では、強度は粒径に依存する。ヤング率は、密度68~98%TDの範囲で30~103GPaの値を示した。バー試験片を用いた熱衝撃試験では、臨界温度差は150~170℃の範囲であった。定常クリープ試験の結果、相対密度90%のLi4SiO4は、T≤800℃では定常状態に達する前に破壊し、900℃では塑性変形を示した。900℃におけるクリープ抵抗は、Li2Oよりも高く、LiAlO2よりも低く、Li2ZrO3とほぼ同等であった。

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