Creep Deformation of Sintered Zirconium Diboride at High Temperatures

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  • 硼化ジルコニウム焼結体の高温荷重変形
  • ホウカ ジルコニウム ショウケツタイ ノ コウオン カジュウ ヘンケイ

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Creep deformation of sintered zirconium diboride were studied at 1690°-1890°C under compressive stress of 160-500kg/cm2 using hot-press furnace. The samples for this experiment were prepared by hot-pressing and grouped into three porosities.<br>Deformation of zirconium diboride was remarkable above 1800°C. The higher load was applied, the more quick deformation occured. Deformation rates also increased with increasing porosity. But it's temperature dependences were independent of porosity and load. Activation energy for deformation was 100-120kcal/mole. Sintered zirconium diboride showed plastic behavior and yield loads were 130-160kg/cm2 for samples with 19-20% porosity at the temperature range of this experiment. The effects of porosity and grain size on deformation rates were discussed. Viscosity calculated from this experiment was compared with that from densification experiment.

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