Wear Resistance of B<sub>4</sub>C-TiB<sub>2</sub> Ceramic Composite
The effects of microstructure and mechanical properties on the wear resistance of B<sub>4</sub>C-TiB<sub>2</sub> ceramic composite were studied. The composite was hot pressed from a B<sub>4</sub>C-TiO<sub>2</sub> precursor at a temperature range of 180...
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Lubricants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4442/13/1/35 |
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| Summary: | The effects of microstructure and mechanical properties on the wear resistance of B<sub>4</sub>C-TiB<sub>2</sub> ceramic composite were studied. The composite was hot pressed from a B<sub>4</sub>C-TiO<sub>2</sub> precursor at a temperature range of 1800 and 1850 °C. Both the relative density and amount of TiB<sub>2</sub> secondary phase of the B<sub>4</sub>C-TiB<sub>2</sub> composite increased with the amount of TiO<sub>2</sub> sintering additive in B<sub>4</sub>C-TiO<sub>2</sub> precursor. The hardness of the composite increased with a secondary phase portion up to 29.8 vol.% TiB<sub>2</sub>. However, the positive effect of TiB<sub>2</sub> secondary phase on the fracture toughness of B<sub>4</sub>C-TiB<sub>2</sub> composite was measured in the complete experimental range, with the highest average attained value of 7.51 MPa·m<sup>1/2</sup>. The wear resistance of B<sub>4</sub>C-TiB<sub>2</sub> composite increased with both the hardness and fracture toughness. The best wear resistance was achieved with the composite with a higher hardness value of 29.74 GPa. This sample consisted of 29.8 vol.% TiB<sub>2</sub> secondary phase and reached a fracture toughness value of 6.91 MPa·m<sup>1/2</sup>. The fracture-induced mechanical wear of B<sub>4</sub>C-TiB<sub>2</sub> composite was the main wear mechanism during the pin-on-disc wear test. Transgranular fracture with pullout of the surface and micro-crack formation in the direction perpendicular to the wear direction was observed on the worn surfaces. |
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| ISSN: | 2075-4442 |