Fabrication and evaluation of mechanical properties of polycrystalline diamond reinforced with carbon-nanotubes by HPHT sintering

被引：8

作者：

Jian, Qi ^{[1
]}

Jiang, Ziling ^{[1
]}

Han, Yang ^{[1
]}

Zhu, Yumei ^{[1
]}

Li, Zhihong ^{[1
]}

机构：

[1] Tianjin Univ, Sch Mat Sci & Engn, Key Lab Adv Ceram & Machining Technol, Minist Educ, Tianjin 300072, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2020年 / 46卷 / 13期

关键词：

HPHT; Carbon nanotubes; PCD; Mechanical properties; Toughness; FRACTURE-TOUGHNESS; COMPOSITES; HARDNESS; CHEMISTRY; CERAMICS;

D O I：

10.1016/j.ceramint.2020.05.254

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this study, carbon nanotubes (CNTs) have been employed as reinforcements for polycrystalline diamond (PCD) to fabricate CNTs/PCD composites at high-pressure and high-temperature (HPHT, 5.5 GPa and 1550 degrees C) conditions. The microstructure, phase composition, elemental distribution, and the effect of CNTs on mechanical properties of CNTs/PCD composites were systematically investigated. Vickers hardness of the sample with 1.5 wt % CNTs reached to 58.3 GPa, while flexural strength was improved to 650.8 MPa. Fracture toughness was enhanced from 5.4 MPa m(1/2) to 9.1 MPa m(1/2), which was 68.5% higher compared with that of the monolithic PCD composites. Furthermore, the toughening mechanism was explored, the increase of fracture toughness is attributed to the pull-out and bridging of CNTs during crack deflection. Additionally, it was concluded that sintering time for 90 s in HPHT can effectively ensure the integrity of CNTs and guarantee their toughening effects.

引用

页码：21527 / 21532

页数：6

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