IMPROVED CASTING LUBRICANT CONTAINING METAL FLUOROBORATE SALT AND IMPROVED DIRECT CHILL CASTING PROCESS
    242.
    发明申请
    IMPROVED CASTING LUBRICANT CONTAINING METAL FLUOROBORATE SALT AND IMPROVED DIRECT CHILL CASTING PROCESS 审中-公开
    改进的铸造润滑剂含有金属氟化物盐和改进的直接冷却工艺

    公开(公告)号:WO01005915A1

    公开(公告)日:2001-01-25

    申请号:PCT/CA2000/000509

    申请日:2000-05-02

    Abstract: An improved casting lubricant for direct chill casting of easily oxidizable metals comprises a lubricating oil and a metal fluoroborate salt which decomposes to form boron trifluoride gas when heated to a temperature at or above a melting point of the easily oxidizable metal. The casting lubricant is preferably used in the hot top method of direct chill casting in which ingots of an easily oxidizable metal are cast in an open-ended mold cavity. In this process, a controlled flow of the casting lubricant is pumped into the mold cavity to contact the metal being cast. The metal fluoroborate salt dispersed in the lubricant decomposes to produce boron trifluoride gas at the metal/mold interface, thereby forming a protective, oxidation-preventing shell on the outer surface of the metal. Preferably, the metal fluoroborate salt is an alkali or alkaline earth metal fluoroborate salt which is a solid at ambient temperatures. Most preferably, the lubricant comprises a 1.0 wt.% dispersion of potassium fluoroborate in castor oil, and is used in the direct chill casting of magnesium, magnesium alloys and aluminum alloys containing magnesium.

    Abstract translation: 用于直接冷却铸造易于氧化的金属的改进的铸造润滑剂包括润滑油和金属氟硼酸盐,当加热到易于氧化的金属的熔点或更高的温度时,其分解形成三氟化硼气体。 铸造润滑剂优选用于直接冷却铸造的热顶法,其中容易可氧化的金属锭铸造在开口模腔中。 在这个过程中,铸造润滑剂的受控流动被泵送到模腔中以接触被铸造的金属。 分散在润滑剂中的金属氟硼酸盐在金属/模具界面处分解产生三氟化硼气体,从而在金属外表面上形成保护性防氧化壳。 优选地,金属氟硼酸盐是在环境温度下为固体的碱金属或碱土金属氟硼酸盐。 最优选地,润滑剂包含1.0重量%的氟硼酸钾在蓖麻油中的分散体,并且用于镁,镁合金和含镁的铝合金的直接冷铸中。

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