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Selection principle of the synthetic route for fabrication of HfB 2 and HfB 2 ‐SiC ceramics
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Abstract
Densification, microstructure, and mechanical properties of spark plasma sintered HfB
2
and HfB
2
‐SiC ceramics using HfB
2
powders from borothermal reduction and boro/carbothermal reduction were investigated and compared. It was found that HfB
2
ceramics obtained by boro/carbothermal reduction exhibited a significantly higher sinterability compared to that by borothermal reduction. Inversely, HfB
2
‐SiC ceramics obtained by borothermal reduction exhibited a refined microstructure and better mechanical properties (Vickers hardness: 23.60 ± 2.43 GPa; fracture toughness: 5.89 ± 0.30 MPa.m
1/2
) than that by boro/carbothermal reduction. These results indicated that optimal fabrication of HfB
2
‐based ceramics could be achieved by the selection of synthetic route of HfB
2
powders.
Title: Selection principle of the synthetic route for fabrication of HfB
2
and HfB
2
‐SiC ceramics
Description:
Abstract
Densification, microstructure, and mechanical properties of spark plasma sintered HfB
2
and HfB
2
‐SiC ceramics using HfB
2
powders from borothermal reduction and boro/carbothermal reduction were investigated and compared.
It was found that HfB
2
ceramics obtained by boro/carbothermal reduction exhibited a significantly higher sinterability compared to that by borothermal reduction.
Inversely, HfB
2
‐SiC ceramics obtained by borothermal reduction exhibited a refined microstructure and better mechanical properties (Vickers hardness: 23.
60 ± 2.
43 GPa; fracture toughness: 5.
89 ± 0.
30 MPa.
m
1/2
) than that by boro/carbothermal reduction.
These results indicated that optimal fabrication of HfB
2
‐based ceramics could be achieved by the selection of synthetic route of HfB
2
powders.
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