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- W2031634510 abstract "Based on the RBAO technology, low-shrinkage mullite/SiC/ Al2O3/ZrO2 composites were fabricated. A powder mixture of 40 vol% Al, 30 vol% A12O3 and 30 vol% SiC was attrition milled in acetone with TZP balls which introduced a substantial ZrO2 wear debris into the mixture. The precursor powder was isopressed at 300–900 MPa and heattreated in air by two different cycles resulting in various phase ratios in the final products. During heating, Al oxidizes to Al2O3 completely, while SiC oxidizes to SiO2 only on its surface. Fast densification (at >1300°C) and mullite formation (at 1400°C) prevent further oxidation of the SiC particles. Because of the volume expansion associated with the oxidation of Al (28%), SiC (108%), and the mullitization (4.2%), sintering shrinkage is effectively compensated. The reaction-bonded composites exhibit low linear shrinkages and high strengths: shrinkages of 7.2%, 4.8%, and 3%, and strengths of 610, 580, and 490 MPa, corresponding to compaction pressure of 300, 600, and 900 MPa, respectively, were achieved in samples containing 49–55 vol% mullite. HIPing improved significantly the mechanical properties: a fracture strength of 490 MPa and a toughness of 4.1 MPa.m1/2 increased to 890 MPa and 6 MPa.m1/2, respectively." @default.
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- W2031634510 date "1994-11-01" @default.
- W2031634510 modified "2023-10-14" @default.
- W2031634510 title "Reaction Bonding and Mechanical Properties of Mullite/Silicon Carbide Composites" @default.
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- W2031634510 doi "https://doi.org/10.1111/j.1151-2916.1994.tb04521.x" @default.
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