Spark plasma sintering of polycrystalline La0.6Ce0.3Pr0.1B6-ZrB2 composites

被引：17

作者：

Wang, Yan ^{[1
]}

Bao, Yan ^{[1
]}

Luo, Shifeng ^{[1
]}

Han, Cuiliu ^{[1
]}

Yang, Xinyu ^{[1
]}

Zhang, Jiuxing ^{[1
]}

机构：

[1] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2023年 / 106卷 / 03期

基金：

中国国家自然科学基金;

关键词：

borides; mechanical properties; oxidation resistance; spark plasma sintering; thermionic emission properties; TEMPERATURE-DEPENDENCE; MECHANICAL-PROPERTIES; SINGLE-CRYSTAL; LAB6; LAB6(001); HARDNESS; SURFACE; CEB6; PRB6;

D O I：

10.1111/jace.18906

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：

This paper has studied the densification, microstructure, and properties of polycrystalline La0.6Ce0.3Pr0.1B6-ZrB2 composites prepared by spark plasma sintering (SPS). The highest relative density of 98.7% is obtained at the SPS condition of axial mechanical pressure 50 MPa, sintering temperature 1900 degrees C and holding time 5 min. The Vickers hardness decreases linearly from the maximum value of 21.49 GPa to the value of 8.24 GPa with the tested temperature increased from room temperature to 1000 degrees C. The effects of crack deflection and bridging have resulted in the fracture toughness of 4.56 MPa m(1/2) of dense polycrystalline La0.6Ce0.3Pr0.1B6-ZrB2 composite. The J(1kV) of 7.02 A/cm(2) obtained at 1600 degrees C, the work function of 2.743 eV determined by ultraviolet photoelectron spectroscopy, and the good oxidation resistance below 1100 degrees C in air have revealed that the dense polycrystalline La0.6Ce0.3Pr0.1B6-ZrB2 composite has a good potential to be a promising hot cathode material.

引用

页码：2118 / 2129

页数：12

共 30 条

[1] DIRECT OBSERVATION OF LAB6(001) SURFACE AT HIGH-TEMPERATURES BY X-RAY AND ULTRAVIOLET PHOTOELECTRON-SPECTROSCOPY, LOW-ENERGY ELECTRON-DIFFRACTION, AUGER-ELECTRON SPECTROSCOPY, AND WORK-FUNCTION MEASUREMENTS
AONO, M
NISHITANI, R
OSHIMA, C
TANAKA, T
BANNAI, E
KAWAI, S
[J]. JOURNAL OF APPLIED PHYSICS, 1979, 50 (07) : 4802 - 4807
[2] SURFACE-STATES OF LAB6(001) AS REVEALED BY ANGULAR-RESOLVED ULTRAVIOLET PHOTOELECTRON-SPECTROSCOPY
AONO, M
TANAKA, T
BANNAI, E
OSHIMA, C
KAWAI, S
[J]. PHYSICAL REVIEW B, 1977, 16 (08): : 3489 - 3492
[3] Preparation and Characterization of Grain Size Controlled LaB6 Polycrystalline Cathode Material
Bao Li-Hong
Zhang Jiu-Xing
Zhou Shen-Lin
Wei Yong-Feng
[J]. CHINESE PHYSICS LETTERS, 2010, 27 (10)
[4] The bending strength temperature dependence of the directionally solidified eutectic LaB6-ZrB2 composite
Bogomol, I.
Nishimura, T.
Nesterenko, Yu.
Vasylkiv, O.
Sakka, Y.
Loboda, P.
[J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2011, 509 (20) : 6123 - 6129
[5] Microstructure, mechanical performance and oxidation mechanism of boride in situ composites
Chen, CM
Zhang, LT
Zhou, WC
Hao, ZZ
Jiang, YJ
Yang, SL
[J]. COMPOSITES SCIENCE AND TECHNOLOGY, 2001, 61 (07) : 971 - 975
[6] Hydrogen absorption properties of the slurry system composed of liquid C6H6 and F-treated Mg2Ni
Chen, CP
Cai, GM
Chen, Y
An, Y
Xu, GH
Wang, QD
[J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 350 (1-2) : 275 - 279
[7] High-Current Lanthanum Hexaboride Hollow Cathode for 10-to-50-kW Hall Thrusters
Chu, Emily
Goebel, Dan M.
[J]. IEEE TRANSACTIONS ON PLASMA SCIENCE, 2012, 40 (09) : 2133 - 2144
[8] Study of mechanical properties of LaB6 single crystal by nanoindentation
Dub, S. N.
Kislaya, G. P.
Loboda, P. I.
[J]. JOURNAL OF SUPERHARD MATERIALS, 2013, 35 (03) : 158 - 165
[9] A DETERMINATION OF THE LOW WORK FUNCTION PLANES OF LAB6
GESLEY, M
SWANSON, LW
[J]. SURFACE SCIENCE, 1984, 146 (2-3) : 583 - 599
[10] A review of multi-physical fields induced phenomena and effects in spark plasma sintering: Fundamentals and applications
Hu, Zheng-Yang
Zhang, Zhao-Hui
Cheng, Xing-Wang
Wang, Fu-Chi
Zhang, Yi-Fan
Li, Sheng-Lin
[J]. MATERIALS & DESIGN, 2020, 191

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