Microstructure and Properties of the Sintered Diamond Reinforced by Diamond-MWCNTs Composite Fibers

Abstract:

A new type of sintered diamond reinforced by diamond-MWCNTs composite fibers which were randomly orientated and even distributed in the diamond matrix was synthesized by using 3(wt)% mullti-walled carbon nanotubes(MWCNTs) as starting additive under high pressure of 5.8GPa at temperature of 1500°C for 1 min. A special polycrystalline diamond structure of direct bonding of both diamond to diamond and diamond to diamond-MWCNTs composite fiber was observed. The testing results show that it possesses not only high hardness (49-52GPa) and Young’s modulus (878GPa) but also high bending strength (1320~1540GPa) and fracture toughness (9.0~9.2MPa•M1/2) as it was theoretically predicted. The high performances of the composite were contributed to the fiber strengthening effect and the special structure which can offer more extensive diamond to diamond bonding.

• Periodical: Solid State Phenomena (Volume 175)
• Pages: 1-7
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.175.1
• Online since: June 2011
• Authors: Fu Ming Deng, Xue Jun Lu, Rui Ping Liu, Guo Jun Xu, Qi Wu Chen, Wen Zhu Li
• Keywords: High Pressure High Temperature (HP/HT), Mullti-Walled Carbon Nanotubes (MWCNTs), Nano-Polycrystalline Diamond Fiber, Property Analysis

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