Spark plasma sintering of polycrystalline La 0.6 Ce 0.3 Pr 0.1 B 6 –ZrB 2 composites

This paper has studied the densification, microstructure, and properties of polycrystalline La 0.6 Ce 0.3 Pr 0.1 B 6 –ZrB 2 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 tempe...

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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
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Summary:This paper has studied the densification, microstructure, and properties of polycrystalline La 0.6 Ce 0.3 Pr 0.1 B 6 –ZrB 2 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 m 1/2 of dense polycrystalline La 0.6 Ce 0.3 Pr 0.1 B 6 –ZrB 2 composite. The J 1kV of 7.02 A/cm 2 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 La 0.6 Ce 0.3 Pr 0.1 B 6 –ZrB 2 composite has a good potential to be a promising hot cathode material.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18906