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

Liang, Hao1; Guan, Shixue1; Li, Xin1; Liang, Akun1; Zeng, Yan1; Liu, Chuanqi2; Chen, Haihua3; Lin, Weitong4; He, Duanwei1; Wang, Liping5; Peng, Fang1

2019-04-15

10.1016/j.ceramint.2019.01.099

CERAMICS INTERNATIONAL   影响因子和分区

0272-8842

1873-3956

A series of pure HfB2 ceramics have been prepared by sintering nano-grained powder using high-energy ball milling at 700-1600 degrees 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 degrees 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 m(1/2), 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.

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

SCI ; EI

英语

通讯

National Key R&D Program of China[2018YFA0305900]

Materials Science

Materials Science, Ceramics

WOS:000460492200166

ELSEVIER SCI LTD

20190306385017

Activation energy ; Ball milling ; Ceramic materials ; Fracture toughness ; Grain boundaries ; Grain size and shape ; Mechanical properties ; Microstructure ; Oxidation resistance ; Sintering ; Temperature ; Thermodynamic stability ; Vickers hardness

Thermodynamics:641.1 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Ceramics:812.1 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Sichuan Univ, Inst Atom & Mol Phys, Chengdu 610065, Sichuan, Peoples R China
2.Chengdu Univ Informat Technol, Coll Optoelect Technol, Chengdu 610225, Sichuan, Peoples R China
3.Qinghai Univ, Dept Basic Educ, Xining 810016, Qinghai, Peoples R China
4.City Univ Hong Kong, Dept Mech Engn, Hong Kong 999077, Peoples R China
5.Southern Univ Sci & Technol, Acad Adv Interdisciplinary Studies, Shenzhen 518055, Peoples R China

Liang, Hao,Guan, Shixue,Li, Xin,et al. Microstructure evolution, densification behavior and mechanical properties of nano-HfB2 sintered under high pressure[J]. CERAMICS INTERNATIONAL,2019,45(6):7885-7893.

Liang, Hao.,Guan, Shixue.,Li, Xin.,Liang, Akun.,Zeng, Yan.,...&Peng, Fang.(2019).Microstructure evolution, densification behavior and mechanical properties of nano-HfB2 sintered under high pressure.CERAMICS INTERNATIONAL,45(6),7885-7893.

Liang, Hao,et al."Microstructure evolution, densification behavior and mechanical properties of nano-HfB2 sintered under high pressure".CERAMICS INTERNATIONAL 45.6(2019):7885-7893.