Effects of Intermetallic NiAl Particle Content on Friction and Wear of Spark Plasma-Sintered Alumina Matrix Composites
The spark plasma sintering (SPS) technology was applied to develop alumina matrix composites (Al<sub>2</sub>O<sub>3</sub>MCs) with different nickel-aluminium (NiAl) particle contents of 5–20 wt.% to understand a correlation between their NiAl particle contents and their micro...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-02-01
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| Series: | Lubricants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4442/13/3/101 |
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| Summary: | The spark plasma sintering (SPS) technology was applied to develop alumina matrix composites (Al<sub>2</sub>O<sub>3</sub>MCs) with different nickel-aluminium (NiAl) particle contents of 5–20 wt.% to understand a correlation between their NiAl particle contents and their microstructures, fracture, hardness, friction, and wear. The incorporation of NiAl particles suppressed micrograins and micropores in the microstructures of the Al<sub>2</sub>O<sub>3</sub>MCs, which resulted in their improved fracture resistance. Increasing the NiAl particle content from 0 to 20 wt.% gave rise to a 23.9% decrease in the hardness of the Al<sub>2</sub>O<sub>3</sub>MCs. The Al<sub>2</sub>O<sub>3</sub>MCs had 18.2% and 13.3% decreases in their friction coefficients and 68.3% and 81.3% decreases in their specific wear rates under the normal loads of 2 and 6 N, respectively, with an increased NiAl particle content from 0 to 20 wt.% thanks to their decreased fatigue wear. The SPS Al<sub>2</sub>O<sub>3</sub>MCs with NiAl particles had promising tribological performance for rotating gas turbine components. |
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| ISSN: | 2075-4442 |