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Pressureless sintering of TiB_2 with low concentration of Co binder to achieve enhanced mechanical properties

机译：低浓度Co粘结剂的TiB_2的无压烧结以获得增强的机械性能

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This paper studies the pressureless sintering of TiB2based materials with a low concentration of 3 wt% Co binder to result in enhanced mechanical properties. Utilizing ultra-fine TiB2powders obtained from a special carbon coated precursors method, TiB2-3 wt% Co composite can be densified to a relative density of ~98.6% at a temperature of 1500 °C without external pressure, which is over ~200 °C lower than literature reported temperatures. The Co binder partially reacts with TiB2and converts into Co2B and Ti-B-Co with good wettings with TiB2. Due to the low sintering temperature, the microstructure is fine with a grain size of ~1.75 ± 0.16 µm. The sample also combines superior mechanical properties including Vickers hardness of ~28.4 ± 0.6 GPa, elastic modulus of ~519.6 ± 17.2 GPa, indentation fracture toughness of ~7.0 ± 0.4 MPa√m, and flexural strength of ~638.3 ± 34.9 MPa. The variation of the Co content to 1, 10, or 20 wt% either leads to low relative density (~91.5% for 1 wt% Co even at a temperature of 1600 °C) or deteriorated mechanical properties (the combination of hardness and fracture toughness, for samples containing 10 and 20 wt% Co) due to the formation of significant amount of brittle Co2B. Correlations between mechanical properties and microstructure are further discussed.
机译：本文研究了低浓度3％（重量）Co粘结剂的TiB2基材料的无压烧结，以提高机械性能。利用通过特殊的碳涂层前体方法获得的超细TiB2粉体，TiB2-3 wt％Co复合材料可以在1500°C的温度下（不超过200°C）被致密化为相对密度〜98.6％。低于文献报道的温度。 Co粘结剂与TiB2部分反应，并转化为Co2B和Ti-B-Co，并具有与TiB2良好的润湿性。由于较低的烧结温度，组织细密，晶粒尺寸约为1.75±0.16μm。该样品还具有优越的机械性能，包括维氏硬度〜28.4±0.6 GPa，弹性模量〜519.6±17.2 GPa，压痕断裂韧性〜7.0±0.4MPa√m和抗折强度〜638.3±34.9 MPa。 Co含量变为1、10或20 wt％的变化会导致较低的相对密度（即使在1600 C的温度下，相对于1 wt％的Co约为91.5％）或降低的机械性能（硬度和断裂的组合）韧性，对于含有10％和20％wt％Co的样品），因为形成了大量的脆性Co2B。进一步讨论了机械性能和微观结构之间的关系。

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