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- W1553669932 abstract "Ultra-High temperature ceramics (UHTCs) are excellent candidates for different components of hypersonic vehicles, especially for leading edges. For aerodynamic reasons, these edges need a very sharp geometry and substantial machining is usually required to achieve the final shape, potentially introducing stresses or flaws into the component. The use of colloidal processing techniques reduces the number of defects in the green body and produces higher particle packing, which ultimately enables achieving full densification at lower temperatures and pressures, even pressureless sintering. The combination of colloidal processing and pressureless sintering allow the preparation of near-net-shape components such as leading edges with reasonable sintered densities and without the formation of secondary phases or significant oxidation. Very recently, interest has been increasing in the ceramic community in using this approach to produce complex-shape UHTC components. The understanding of the interaction forces among powder particles in suspensions is the key to dispersing particles and producing a low viscosity formulation that leads to a high density defect-free material. This chapter includes some background information about the relationship between interparticle forces, rheology and shaping. We also describe a case study of colloidal processing of zirconium diboride by combining slip casting with pressureless sintering. The promising results are the starting point in the development of other near-net-shape processes for the manufacture of UHTC components." @default.
- W1553669932 created "2016-06-24" @default.
- W1553669932 creator A5009895161 @default.
- W1553669932 creator A5067713844 @default.
- W1553669932 date "2014-10-10" @default.
- W1553669932 modified "2023-09-26" @default.
- W1553669932 title "Near-Net-Shaping of Ultra-High Temperature Ceramics" @default.
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- W1553669932 doi "https://doi.org/10.1002/9781118700853.ch5" @default.
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