TiB2-(2mol%Y2O3-ZrO2)焼結体の作製と機械的性質

概要

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Full dense TiB2 sintered bodies containing 2 mol%Y2O3-ZrO2 up to 40 wt% were fabricated by glass encapsulation HIP method. Mechanical properties of these TiB2-(2 mol%Y2O3-ZrO2) sintered bodies were evaluated and compared to those of TiB2-ZrO2 sintered bodies, which were fabricated and evaluated in our previous work. Three-point-bending-strength of TiB2-10-20 wt%(2 mol%Y2O3-ZrO2) was 1160-1200 MPa, which is almost the same strength as that of TiB2-10 wt%ZrO2. Our previous work showed that the addition of 10 wt%ZrO2 was effective in improving the bending strength of sintered TiB2. In this work, it was found that the addition of 2 mol%Y2O3-ZrO2 was more effective in improving the bending strength of sintered TiB2 than the addition of plain ZrO2, by the comparison of TiB2-(2 mol%Y2O3-ZrO2) and TiB2-ZrO2 strength. Vickers hardness of TiB2-(2 mol%Y2O3-ZrO2) was also higher than that of TiB2-ZrO2. On the other hand, higher fracture toughness was obtained in TiB2-ZrO2. These differences of mechanical properties between TiB2-(2 mol%Y2O3-ZrO2) and TiB2-ZrO2 were caused by the differences of monoclinic ZrO2 content in the sintered bodies.
社団法人粉体粉末冶金協会の論文