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Hot Pressed HfB 2 and HfB 2 –20 vol%SiC Ceramics Based on HfB 2 Powder Synthesized by Borothermal Reduction of HfO
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Phase pure hafnium diboride (HfB
2
) powder was synthesized by borothermal reduction of hafnium dioxide using amorphous boron at relatively low temperature (1600°C) in vacuum. The synthesized HfB
2
powder had an average particle size of 1.37 μm with an equiaxed shape, and a low oxygen content of 0.79 wt%. Using the as‐synthesized HfB
2
powder and a commercial SiC, HfB
2
monolithic, and HfB
2
–20 vol%SiC composite were hot pressed at 2000°C to relative densities of 95.7% and 99.2%, respectively. With the addition of SiC, the grain size decreased and the fracture behavior changed from intergranular to a mixed mode, which resulted in a high flexural strength of 993±90 MPa for the composite. Fracture toughness of the composite was 6.29±0.65 MPa m
1/2
, which was significantly higher than that of the HfB
2
monolithic and the reported values in literature.
Title: Hot Pressed HfB
2
and HfB
2
–20 vol%SiC Ceramics Based on HfB
2
Powder Synthesized by Borothermal Reduction of HfO
Description:
Phase pure hafnium diboride (HfB
2
) powder was synthesized by borothermal reduction of hafnium dioxide using amorphous boron at relatively low temperature (1600°C) in vacuum.
The synthesized HfB
2
powder had an average particle size of 1.
37 μm with an equiaxed shape, and a low oxygen content of 0.
79 wt%.
Using the as‐synthesized HfB
2
powder and a commercial SiC, HfB
2
monolithic, and HfB
2
–20 vol%SiC composite were hot pressed at 2000°C to relative densities of 95.
7% and 99.
2%, respectively.
With the addition of SiC, the grain size decreased and the fracture behavior changed from intergranular to a mixed mode, which resulted in a high flexural strength of 993±90 MPa for the composite.
Fracture toughness of the composite was 6.
29±0.
65 MPa m
1/2
, which was significantly higher than that of the HfB
2
monolithic and the reported values in literature.
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