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首页> 外文期刊>Journal of the European Ceramic Society >Electrically conductive ZrO_2-TiN composites
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Electrically conductive ZrO_2-TiN composites

机译：导电ZrO_2-TiN复合材料

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摘要

1.75 mol percent Y_2O_3-stabilized ZrO_2-TiN composites could be fully densified by hot pressing for lh at 1550 deg C in vacuum under a mechanical pressure of 28 MPa. Composites with 35-95 vol percent TiN were investigated and the best mechanical properties, i.e., a Vickers hardness of 14.7 GPa. an indentation toughness of 5.9 MPa m~(1/2) and an excellent bending strength of 1674 MPa were obtained with 40 vol percent TiN. The active toughening mechanisms were identified and their contribution to the overall composite toughness as function of the TiN content was modelled, experimentally verified and discussed. Transformation toughening was found to be the primary toughening mechanism. The TiN grain size was found to increase with increasing TiN content, resulting in a decreasing hardness and strength. A maximum strength was obtained at 40vol percent TiN. The electrical resistivity of the composites decreases exponentially with increasing TiN content and correlates well with the Polder-Van Santen mixture rule. Thus at around 40 vol percent TiN, the conductivity is high enough to allow EDM machining of the composite, therefore avoiding the expensive grinding operation for final shaping and surface finishing of components.
机译：通过在1550℃，真空和28 MPa的机械压力下热压1h，可以将1.75摩尔％的Y_2O_3稳定的ZrO_2-TiN复合材料完全致密化。研究了TiN含量为35-95％的复合材料，并获得了最佳的机械性能，即14.7 GPa的维氏硬度。 TiN含量为40％（体积）时，压痕韧性为5.9 MPa m〜（1/2），弯曲强度为1674 MPa。确定了活性增韧机理，并对它们作为TiN含量的函数对整体复合韧性的贡献进行了建模，实验验证和讨论。发现相变增韧是主要的增韧机理。发现TiN晶粒尺寸随TiN含量的增加而增加，从而导致硬度和强度降低。 TiN含量为40vol％时，可获得最大强度。复合材料的电阻率随TiN含量的增加呈指数下降，并且与Polder-Van Santen混合规则密切相关。因此，当TiN含量约为40％（体积）时，电导率足够高，可以对复合材料进行EDM加工，从而避免了最终成型和零件表面精加工所需的昂贵磨削操作。

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