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以TiO_2粉、C粉、Al粉为原料,采用放热弥散法制备Al-TiO_2-C晶粒细化剂,并进行晶粒细化试验。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)及能谱分析(EDS)等方法研究了不同TiO_2含量细化剂的显微组织。结果表明,Al-TiO_2-C晶粒细化剂由α-Al,Al_3Ti,Al_2O_3和Ti C相组成。TiO_2含量不同,Al-TiO_2-C晶粒细化剂内第二相形貌及分布也不同。当TiO_2含量为12%(质量分数)时,细化剂组织中Al_3Ti内包裹有大量的Al2O3和Ti C颗粒,这些颗粒将Al_3Ti分割开来,Al_3Ti相呈现圆块状,此时组织相对分布均匀。TiO_2含量不同,AlTiO_2-C晶粒细化剂对工业纯铝的细化效果也不同。随着TiO_2含量的增加,Al-TiO_2-C细化剂对工业纯铝的细化效果呈现先变好后变差的变化趋势,其中当TiO_2含量为12%时,其细化效果达到相对最好。本文细化剂的最佳添加量为0.3%。当细化剂中TiO_2含量为12%时,0.3%的细化剂添加量可使工业纯铝细化到约154μm。
Using TiO 2 powder, C powder and Al powder as raw materials, Al-TiO_2-C grain refiner was prepared by exothermic dispersion method and the grain refinement test was carried out. The microstructures of different TiO 2 refiners were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that Al-TiO_2-C grain refiner consists of α-Al, Al_3Ti, Al_2O_3 and TiC phases. TiO 2 content is different, Al-TiO 2-C grain refiner second phase morphology and distribution are also different. When TiO 2 content is 12% (mass fraction), a large amount of Al 2 O 3 and TiC particles are encapsulated in Al 3 Ti in the refiner. These particles segregate Al 3 Ti and the Al 3 Ti phase presents a round block, . TiO 2 content is different, AlTiO_2-C grain refiner refinement effect on industrial pure aluminum is also different. With the increase of TiO 2 content, the refinement effect of Al-TiO_2-C refiner on industrial pure aluminum shows the trend of getting worse first, and the refining effect reaches the relative value when TiO 2 content is 12% it is good. The optimum amount of refiner is 0.3%. When the content of TiO 2 in the refiner is 12%, the addition of 0.3% refiner can refine the industrial pure aluminum to about 154 μm.