Nanostructured diamond-TiC composites with high fracture toughness

Nanostructured diamond-TiC composites with high fracture toughness
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具有高断裂韧性的纳米结构金刚石-TiC复合材料

DOI:
10.1063/1.4789004
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发表时间:
2013-01
期刊:
Jounal of Applied Physics
影响因子:
--
通讯作者:
Chao Xu et al
Chao Xu et al
中科院分区:
其他
文献类型:
--
作者:
Haikuo Wang;Duanwei He;Chao Xu et al

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我们报告的纳米结构的金刚石-TiC复合材料的制备具有高断裂韧性和高硬度从球磨的纳米尺寸的Ti 3SiC 2和亚微米尺寸的金刚石的混合物,通过同时调整的压力-温度条件。通过X射线衍射和高分辨透射电镜研究了Ti_3SiC_2在5.5GPa压力下的相分离,发现在600-700 °C时,Ti_3SiC_2分解为纳米TiC和非晶Ti-Si。金刚石和Ti-Si之间的后续反应导致非晶Ti-Si-C基质,其中嵌入金刚石和TiC晶体。在加载力为98 N时,复合材料的断裂韧性KIC和维氏硬度HV分别达到14 MPa m1/2和45.5 GPa。研究结果表明,纳米晶/非晶粘结基体能显著提高脆性复合材料的韧性。
We report the preparation of nanostructured diamond-TiC composites with high fracture toughness and high hardness starting from a ball-milled mixture of nano-sized Ti3SiC2 and submicron-sized diamond by simultaneously tuning the pressure-temperature conditions. The phase segregation of Ti3SiC2 at pressure of 5.5 GPa were investigated by X-ray diffraction and high resolution transmission electron microscopy, we found that the Ti3SiC2 could decompose into nanosized TiC and amorphous Ti-Si at 600–700 °C. The subsequent reaction between diamond and Ti-Si led to an amorphous Ti-Si-C matrix in which diamond and TiC crystals are embedded. With a loading force of 98 N, the measured fracture toughness KIC and Vicker's hardness HV of the synthesized composites reach up to 14 MPa m1/2 and 45.5 GPa, respectively. Our results demonstrate that the nanocrystalline/amorphous bonding matrix could largely enhance the toughness of the brittle composites.
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