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In Situ ZrB 2 Formation in B 4 C Ceramics and Its Strengthening Mechanism on Mechanical Properties.
- Source :
- Materials (1996-1944); Nov2022, Vol. 15 Issue 22, p7961, 11p
- Publication Year :
- 2022
-
Abstract
- In order to reduce the sintering temperature and improve the mechanical properties of B<subscript>4</subscript>C ceramics, ZrB<subscript>2</subscript> was formed in situ using the SPS sintering method with ZrO<subscript>2</subscript> and B<subscript>4</subscript>C as raw materials. Thermodynamic calculations revealed that CO pressure affected the formation of ZrB<subscript>2</subscript> at temperatures from 814 °C to 1100 °C. The experimental results showed that the ZrB<subscript>2</subscript> grain size was <5 µm and that the grains were uniformly distributed within the B<subscript>4</subscript>C ceramics. With an increase in ZrO<subscript>2</subscript> content, the Vickers hardness and flexural strength of the B<subscript>4</subscript>C ceramics first increased and then decreased, while the fracture toughness continuously increased. When the content of ZrO<subscript>2</subscript> was 15 wt%, the Vickers hardness, fracture toughness and flexural strength of B<subscript>4</subscript>C ceramics were 35.5 ± 0.63 GPa, 3.6 ± 0.24 MPa·m<superscript>1/2</superscript> and 403 ± 10 MPa, respectively. These results suggest that ZrB<subscript>2</subscript> inhibits B<subscript>4</subscript>C grain growth, eliminates crack tip stress, and provides fine grain to strengthen and toughen B<subscript>4</subscript>C ceramics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 15
- Issue :
- 22
- Database :
- Complementary Index
- Journal :
- Materials (1996-1944)
- Publication Type :
- Academic Journal
- Accession number :
- 160462905
- Full Text :
- https://doi.org/10.3390/ma15227961