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The production of Al-Ti-B grain refining master alloys

机译:Al-Ti-B晶粒细化中间合金的生产

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摘要

In this paper the interfacial phenomena observed when an Al-Ti-B master alloy is produced are studied using a modified sessile drop technique. The effect of emulsification is demonstrated and the influence of small levels of CaF_2 and MgF_2 are seen. Al-Ti-B master alloys are made by the addition of potassium fluotitanate, K_2TiF_6, and potassium fluoborate, KBF_4, to molten aluminium at 750 deg C. The product is an Al-5 wt percent Ti-1 wt percent B master alloy and a KF-AlF_3 flux of eutectic composition. Problems can occur with the production of such alloys by (a) the emulsification of the liquid Al-Ti-B alloy and KF-AlF_3 flux and (b) the agglomeration of titanium diboride particles by the wetting and engulfment of the KF-AlF_3 flux. It has been found that levels of CaF_2 and MgF_2 in the fluoride salts greater than 50 ppm and 70 ppm, respectively, can prevent this emulsification and boride agglomeration.
机译:在本文中,使用改进的无滴落技术研究了生产Al-Ti-B中间合金时观察到的界面现象。证明了乳化作用,并观察到少量CaF_2和MgF_2的影响。 Al-Ti-B中间合金是通过在750℃下向熔融铝中添加氟钛酸钾K_2TiF_6和氟硼酸钾KBF_4制成的。产品是Al-5 wt%的Ti-1 wt%B中间合金和共晶成分的KF-AlF_3通量。通过(a)液态Al-Ti-B合金和KF-AlF_3助熔剂的乳化以及(b)KF-AlF_3助熔剂的润湿和吞噬使二硼化钛颗粒结块,可能会产生此类合金问题。已经发现,氟化物盐中的CaF_2和MgF_2的含量分别大于50ppm和70ppm可以防止这种乳化和硼化物团聚。

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