Fast consolidation of ceramic powders
作者： Subhash H. Risbud , Chien-Hua Shan
DOI: 10.1016/0921-5093(95)09951-4
关键词: Mineralogy 、 Aluminium nitride 、 Composite material 、 Materials science 、 Nitride 、 Electrical resistivity and conductivity 、 Ceramic 、 Electric discharge 、 Sintering 、 Grain boundary 、 Grain growth
摘要: Very fast densification of ceramic powders (alpha-alumina, aluminum nitride, and YBCO superconducting oxides) using prior electric discharge before resistance sintering leads to microstructures that retain the particle size starting powders. The time taken achieve near-theoretical density can be as little 5 min usually not more than 15 min. short is principal reason for arresting possible grain growth step may perhaps responsible sweeping off impurities from powder surfaces, thus giving clean boundaries in sintered material. In surface effect appears create a filamentary layer gives unexpectedly high (240 300 K) resistivity onsets diamagnetic behavior.
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