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ZrO2 based composites with the ability to be machined by electrical discharge machining (EDM) are developed. The importance of EDM is in its capability for shaping complex ceramic parts, which are difficult to be machined by conventional machining techniques. A minimum electrical conductivity threshold, which is a prerequisite for EDM, was obtained by incorporating hard and electrically conductive TiN, TiCN, NbC and WC phases into the ZrO2 matrix. The effect of the type and content of the secondary phases, pressure assisted sintering method, sintering temperature and ZrO2 stabiliser type and content on the mechanical properties and hydrothermal stability of the composites is investigated. As a result, a new class of ZrO2-based ceramic composites, including real nanocomposites, was developed which not only allow EDM machining, but also offer a unique combination of hardness, strength and fracture toughness. An innovative hot isostatic pressing method is developed in order to upscale the production of the ZrO2-based composites. A finite element tool was developed to calculate the thermal expansion coefficient, thermal and electrical conductivity, stiffness and thermal residual stresses in the constituent phases of the ZrO2-based composites from their densified microstructure using the intrinsic properties of the constituent phases. The results of the FE model were compared with analytically calculated and experimentally measured data. Omwille van de moeilijke en dure conventionele bewerking van keramische materialen werden vonkerodeerbare ZrO2-basis composieten ontwikkeld. De minimale elektrische geleidbaarheid, een kritische voorwaarde voor vonkerosie, werd bekomen door het toevoegen van een harde elektrische geleidende TiN, TiCN, NbC of WC fase aan de isolerende ZrO2 matrix. Als resultaat werd een nieuwe klasse ZrO2-basis composieten ontwikkeld die niet alleen te bewerken is via vonkerosie, maar tevens een unieke combinatie aan hardheid, sterkte en beuktaaiheid heeft. ZrO2 based composites with the ability to be machined by electrical discharge machining (EDM) are developed. The importance of EDM is in its capability for shaping complex ceramic parts, which are difficult to be machined by conventional machining techniques. A minimum electrical conductivity threshold, which is a prerequisite for EDM, was obtained by incorporating hard and electrically conductive TiN, TiCN, NbC and WC phases into the ZrO2 matrix. As a result, a new class of ZrO2-based ceramic composites, including real nanocomposites, was developed which not only allow EDM machining, but also offer a unique combination of hardness, strength and fracture toughness.

666.3 --- Academic collection --- Ceramics in general. Ceramic raw materials --- Theses --- 666.3 Ceramics in general. Ceramic raw materials

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Ceramics --- Ceramiek (Techniek) --- Céramique (Technique) --- 666 --- 666.3 --- Glass industry. Ceramics. Cement and concrete --- Ceramics in general. Ceramic raw materials --- 666.3 Ceramics in general. Ceramic raw materials --- 666 Glass industry. Ceramics. Cement and concrete --- Ceramic engineering --- Engineering --- Ceramics.

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Glass --- Ceramics --- Céramique industrielle --- 666.3 --- keramiek --- Ceramic technology --- Industrial ceramics --- Keramics --- Building materials --- Chemistry, Technical --- Clay --- Ceramics in general. Ceramic raw materials --- Ceramics. --- 666.3 Ceramics in general. Ceramic raw materials --- Matériaux céramiques --- Céramique industrielle --- Céramique industrielle. --- Matériaux céramiques. --- Céramique industrielle. --- Matériaux céramiques.

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This important 2 volume set highlights the state-of-the-art on fracture research and the application of fracture mechanics to brittle disordered materials such as concrete, rock and ceramics. It forms the invited and submitted contributions to the international RILEM/ESIS sysmposium held in Noordwijk, The Netherlands in June 1991.

Ceramic materials --- Concrete --- Fracture mechanics --- Rocks --- Fracture --- Congresses. --- 531 --- 624.012.4 --- 666.3 --- 666.972 --- 691.3 --- Petrology --- Stone --- Beton --- Building materials --- Ceramic industries --- Ceramics --- Mines and mineral resources --- 666.3 Ceramics in general. Ceramic raw materials --- Ceramics in general. Ceramic raw materials --- 531 General mechanics. Mechanics of solid and rigid bodies --- General mechanics. Mechanics of solid and rigid bodies --- 666.972 Concrete. Cement concrete --- Concrete. Cement concrete --- 624.012.4 Structures in concrete, in-situ concrete (ordinary concrete), mass concrete --- Structures in concrete, in-situ concrete (ordinary concrete), mass concrete --- 691.3 Artificial stone. Concrete. Various agglomerates --- Artificial stone. Concrete. Various agglomerates --- Fracture&delete& --- Congresses --- Materials --- Crags (Rocks)