坩埚及有关制品用石墨制作的成型和耐火的石墨坩埚及其有关制品，例如坩埚、曲 颈瓶、塞头和喷嘴等，具有高耐火性，低的热膨胀性，熔炼金属过程中，遭到金属滋润和冲刷时亦稳定，高温下杰出的热震稳定性和优良的传导性，所以石墨坩埚及其有关制品被广泛用于直接熔融金属的工艺中。

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