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- W43341957 abstract "Two processing routes for the composite system Al 2 O 3 SiC (SiC content ranging from 2.5 to 25 vol%) in water have been developed, using SiC powder with a chemically modified surface. For each system, slurry properties were optimised by measuring adsorption isotherms and rheological behaviour. Slurries with high solid loadings (47 vol%) and homogeneous SiC distribution could be realised. Green bodies of high densities (up to 62% of theory) for various SiC contents were prepared by slip casting into a porous mould and drying in air. Pressureless sintering was conducted under different atmospheres (N 2 or Ar) and temperatures (1690 to 1950 °C). Sintering conditions to obtain high densities strongly depend on the SiC content and on the processing route of the composite. Best results for one processing route were obtained for 10 and 15 vol% SiC samples, each reaching densities of 97.5% of theory when sintered for 1 h in N 2 at 1880 °C. A sample prepared by the other developed system, containing 5 vol% of SiC could be densified up to 98.2% of theory when sintered for 1 h in N 2 at 1800 °C. Zwei Prozeβtechniken zur Herstellung von Al 2 O 3 SiC Kompositen über wäβrige Schlicker wurden unter Verwendung von oberflächenmodifiziertem SiC entwickelt (der SiC Anteil lag dabei zwischen 2.5 und 25 vol%). Die Schlickerparameter für jedes System wurden durch die Bestimmung von Adsorptionsisothermen und die Untersuchung der rheologischen Eigenschaften optimiert, wodurch hohe Feststoffgehalte (47 vol%) und eine homogene SiC Verteilung resultierten. Schlickerguβ in eine poröse Form und anschlieβendes Trocknen an Luft ergab Probekörper mit hohen Gründichten (bis zu 62% des theoretischen Wertes). Sintern erfolgte drucklos in verschiedenen Atmosphären (N 2 oder Ar) zwischen 1690 und 1950 °C. Die ermittelten Sinterdichten variierten stark mit dem SiC Gehalt und waren von der verwendeten Prozeβtechnik abhängig. Eine Probe mit 5 vol% SiC, welche nach der ersten Technik hergestellt wurde, erreichte eine Dichte von 98.2% der Theorie (1800 °C, N 2 , 1 h), während Probekörper mit 10 oder 15 vol% Sic, hergestellt nach der zweiten Verarbeitungstechnik, auf jeweils 97.5% relativer Dichte gesintert werden konnten (1880 °C, sonst gleiche Sinterbedingungen)." @default.
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- W43341957 date "1997-01-01" @default.
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- W43341957 title "Processing of composites in aqueous media" @default.
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- W43341957 doi "https://doi.org/10.1016/s0955-2219(97)80001-f" @default.
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