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Superior Sliding Wear Performance Of Pressure Slip Cast Alumina Products

P Raju, Asit Kumar Khanra, S Kumar, Y S Rao, Roy Johnson

Alumina (Al2O3) with its superior mechanical and tribological properties in combination with chemical inertness is a preferred material for wear resistant applications. In this paper, alumina sintered products shaped by Pressure Slip Cast (PSC) are evaluated for their sliding wear behaviour and compared with the same produced through Conventional Slip Casting (CSC). Due to close packing achieved through the application of pressure on the slip, the PSC products exhibit high density, which complements to enhance the hardness (15.45 ± 0.15 GPa), flexural strength (259 MPa) and fracture toughness (4.07 MPa m3/2). The same estimated for CSC samples are 11.77 ± 0.15 GPa, 242.70 MPa and 3.73 MPa m3/2 respectively. Owing to the above fact, the PSC alumina exhibit the wear rate as low as 2.35 × 10-18 m3/Nm (with 0.5 m/sec at 5N load) are found to 56% less wear rate than CSC alumina. The superior wear rate of PSC alumina will have commercial implications in ceramic industry