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

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 19...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2023-03, Vol.106 (3), p.2118-2129
Main Authors: Wang, Yan, Bao, Yan, Luo, Shifeng, Han, Cuiliu, Yang, Xinyu, Zhang, Jiuxing
Format: Article
Language:English
Subjects:
borides
Composite materials
Densification
Diamond pyramid hardness
Electrode materials
Fracture toughness
Hot cathodes
mechanical properties
Oxidation resistance
Photoelectrons
Polycrystals
Refractory materials
Room temperature
Spark plasma sintering
Specific gravity
thermionic emission properties
Work functions
Zirconium compounds
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Summary: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°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°C. The effects of crack deflection and bridging have resulted in the fracture toughness of 4.56 MPa m1/2 of dense polycrystalline La0.6Ce0.3Pr0.1B6–ZrB2 composite. The J1kV of 7.02 A/cm2 obtained at 1600°C, the work function of 2.743 eV determined by ultraviolet photoelectron spectroscopy, and the good oxidation resistance below 1100°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.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18906