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• W2936211457 abstract "One limitation of using silicon carbide (SiC) is the materials’ intrinsic brittleness. The mechanical properties of these ceramics can be improved through the use of additives during the sintering process. This research investigated the addition of boron carbide (B 4 C) on the Liquid Phase Sintered (LPS) SiC-Al 2 O 3 -Y 2 O 3 system. The aim was to determine the effects on both the mechanical properties and microstructure of the LPS-SiC composite with varying levels of B 4 C as an additive. The Silicon Carbide preparation was composed of a 10 wt% mixture of Alumina (Al 2 O 3 ) and Yttria (Y 2 O 3 ) at a 3:2 M ratio, with different concentrations of boron carbide between 0 - 6 wt%. In addition, 1 wt% of carbon powder was added to the precursors to prevent oxidation during sintering. All precursors were milled for 2 h at 200 rpm and then samples were sintered by the pressureless technique for 1 h at 1900 °C in an argon atmosphere. A relationship was observed between the measured mechanical properties, the porosity and various phases formed in within the structure of the ceramic composite. The grain size and distribution of the B 4 C reinforcement phase provides a mechanism for the observed strengthening and increase in fracture toughness. Increasing the B 4 C content up to 5 wt% enhanced the strength and fracture toughness of the composite samples, however increasing beyond 5 wt% led to a decrease in these properties. Furthermore, a microstructural explanation of the grain-effects is proposed by considering the crack-growth micro-patterns. This work clarifies the link between the mechanical properties and microstructural characteristics of the SiC-Al 2 O 3 -Y 2 O 3 composite with B 4 C additive. The strengthening mechanism of B 4 C additives was also explored in the microscopic scale." @default.
• W2936211457 created "2019-04-25" @default.
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• W2936211457 date "2019-07-01" @default.
• W2936211457 modified "2023-09-27" @default.
• W2936211457 title "Pressureless sintering of LPS-SiC (SiC-Al2O3-Y2O3) composite in presence of the B4C additive" @default.
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• W2936211457 doi "https://doi.org/10.1016/j.ceramint.2019.04.060" @default.
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