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1995
Journal Article
Titel
Sintering ZrO2/TiC composites with TiH2. The role of transient liquid phase and of substoichiometry
Alternative
Sintern von ZrO2/TiC-Keramiken mit TiH2. Die Wirkung einer transienten flüssigen Phase und von Substöchiometrie
Abstract
Sintering tetragonal ZrO2 with 35 vol-% TiC results in a microstructure where all grain facets are free of amorphous interfaces independent of sintering aids as TiH2 or MgO/Y2O3; grain sizes are below 1 mym. With substoichiometric TiC(1-x), a relative density of 95 % and closed porosity are obtained at a lower sintering temperature than with stoichiometric TiC, but subsequent cladless hot isostatic pressing (HIP) is required to achieve 99 % density. High densities of 98 % accompanied by good mechanical properties become possible by pressureless sintering with the use of TiH2. MgO/Y2O3 doping also promotes densification but results in less transformable zirconia and increases the number and size of amorphous triple junctions. The consequences are a lower fracture toughness and strength.
Tags
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Bruchzähigkeit
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composite ceramics
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doping additives
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Festigkeit
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fracture toughness
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grain boundary structure
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Hartstoffverstärkung
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Korngrenzenstruktur
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Mischkeramik
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oxid ceramics
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Oxidkeramik
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phase stability
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Phasenstabilität
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sintering
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strength
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transient liquid phase
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transiente flüssige Phase
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zirconia
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ZrO2