Abstract Diborides of Zr, Ti and Hf have potential applications as ultrahigh temperature ceramics, armor material, MEMS, substrates for optoelectronic applications and solar absorbers. Previous reports suggest that crystallographically textured diboride compacts have better mechanical and functional properties. Current methods of fabricating textured compacts are either cumbersome or energy and time intensive. We demonstrate a novel method for fabrication of bulk textured TiB2 by reactive spark plasma sintering (RSPS) of Ti-B mixtures having graphene nanoplatelets (GNP) as reinforcement. GNP acted as a template resulting in formation of large TiB2 grains with plate type morphology. X-ray diffraction and Electron backscattered diffraction analysis revealed presence of basal texture in TiB2 – GNP compacts. In comparison to GNP, carbon nanotube addition is shown to result in randomly oriented equiaxed grains. The improvement in indentation fracture toughness indicates GNP is better toughening additive compared to CNT.

中文翻译：

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石墨烯纳米片在二硼化钛的反应放电等离子体烧结过程中诱导晶体结构

摘要 Zr、Ti 和 Hf 的二硼化物在超高温陶瓷、装甲材料、MEMS、光电应用基板和太阳能吸收器等方面具有潜在应用。以前的报告表明，晶体结构的二硼化物压块具有更好的机械和功能特性。当前制造纹理压块的方法要么繁琐，要么耗费精力和时间。我们展示了一种通过具有石墨烯纳米片 (GNP) 作为增强材料的 Ti-B 混合物的反应放电等离子体烧结 (RSPS) 制造块状纹理 TiB2 的新方法。GNP 充当模板，导致形成具有板状形态的大 TiB2 晶粒。X 射线衍射和电子背散射衍射分析表明 TiB2 – GNP 压块中存在基底织构。与国民生产总值相比，添加碳纳米管显示出随机取向的等轴晶粒。压痕断裂韧性的提高表明，与 CNT 相比，GNP 是更好的增韧添加剂。