Microstructure evolution, densification behavior and mechanical properties of nano-HfB2 sintered under high pressure

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Hao Liang
  • Shixue Guan
  • Xin Li
  • Akun Liang
  • Yan Zeng
  • Chuanqi Liu
  • Haihua Chen
  • Duanwei He
  • Liping Wang
  • Fang Feng

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)7885-7893
Journal / PublicationCeramics International
Volume45
Issue number6
Early online date14 Jan 2019
Publication statusPublished - 15 Apr 2019

Abstract

A series of pure HfB2 ceramics have been prepared by sintering nano-grained powder using high-energy ball milling at 700–1600 °C and 5.5 GPa. The HfB2 ceramics are characterized via various techniques for their residual stress, grain size, density, microstructures and defects, hardness, fracture toughness, thermal stability, and oxidation resistance. All properties strongly depend on the treatment temperature, but the exact manner of dependence for each property varies. The results identified that the HfB2 ceramic sintered at a relatively low temperature of 1000 °C and 5.5 GPa – a bulk pure nano-grained composite for the first time – has the best overall performance. It has a relative density of 99.6%, a Vickers hardness of 26 GPa, a fracture toughness of 5.2 MPa m1/2, and excellent thermal stability and oxidation resistance at high temperatures. Additional strengthening and stabilizing effects are provided by microstructures and defects such as large-angle grain boundaries, stacking faults and twinning. Simultaneous high temperature and high pressure is an effective sintering route for HfB2 ceramics with grain-size ranging from nanometer to micron.

Research Area(s)

  • Activation energy, Hafnium diboride, High pressure and high temperature, Mechanical behavior, Microstructure evolution, Nanostructured

Citation Format(s)

Microstructure evolution, densification behavior and mechanical properties of nano-HfB2 sintered under high pressure. / Liang, Hao; Guan, Shixue; Li, Xin; Liang, Akun; Zeng, Yan; Liu, Chuanqi; Chen, Haihua; Lin, Weitong; He, Duanwei; Wang, Liping; Feng, Fang.

In: Ceramics International, Vol. 45, No. 6, 15.04.2019, p. 7885-7893.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review