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Ultrafine TiB2 powders were synthesized by rapid carbothermal reduction in a vertical tubular reactor through which the particles fell freely. The starting materials were TiO2, H3BO3 and cornstarch, which were mixed and calcined at 400°C for 1 h. The calcined precursor was milled, sieved and then fed into the top of the reactor. The reduction was carried out between 1786–1791°C in a downward flow...
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