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钛氟酸钾-木屑法制备Al-Ti-C母合金机制与显微组织研究 被引量:3

Mechanism and Microscopic Structure of Al-Ti-C Master Alloy Prepared by Potassium Fluotitanate-Sawdust Method
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摘要 采用X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)等研究了氟盐-木屑法制备的Al-Ti-C母合金的组织性能。结果表明:由氟盐-木屑与铝液反应制备的Al-Ti-C母合金的合成过程包含以下几个阶段。(1)铝与钛氟酸钾反应置换出的钛与铝反应生成钛铝化合物;(2)木屑在高温条件下发生脱水、碳化反应,裂解产物二氧化碳、碳与铝反应生成碳铝金属化合物,与钛反应生成钛碳化合物;(3)钛铝、碳铝、钛碳化合物组成具有细化作用的Al-Ti-C母合金。合金的物相为α(Al)、铝钛化合物与碳铝化合物组成的共晶组织,其中α(Al)相的平均晶粒尺寸为10~60μm。铝钛化合物为棒状、骨骼状共晶组织并沿晶界分布,晶内可见针片状Al_3Ti,颗粒状TiC相聚合成团块状分布。木屑裂解产物水、二氧化碳与铝反应生成氧化铝和氢以渣-气共生的形式聚集于晶界。 The microstructure and properties of Al-Ti-C master alloy prepared by fluorine salt and sawdust method were studied by Xray diffraction (XRD),scanning electron microscope (SEM) and energy dispersive spectrometer (EDS).The results showed that the synthesis process of Al-Ti-C master alloy prepared by the reaction of K2 TiF6 -sawdust and aluminum liquid contained the following stages.(1) The titanium substituted by the reaction of aluminum and potassium fluotitanate reacted with aluminum to produce the titanium aluminum compounds.(2) The sawdust were dehydrated and carbonized under high temperature,and then cracking products-carbon dioxide and carbon reacted with aluminum to form carbon and aluminum compounds,and reacted with titanium to form titanium carbon compounds.(3) Titanium aluminum,carbon aluminum and titanium carbon compounds formed Al-Ti-C parent alloy with refining effect.The phase of the alloy was a eutectic structure composed of α(Al),aluminum and titanium compounds and carbon aluminum compounds,with α(Al) phase's average grain size of 10 ~ 60 μm.The aluminum and titanium compounds were rod like,bone like eutectic and distributed along the grain boundary.The needle like Al3 Ti was found in the crystal,and the granular TiC aggregated to form a clump like distribution.Sawdust's crackate-water,carbon dioxide reacted with aluminum to produce alumina and hydrogen at the grain boundary in the form of slag-gas symbiosis.
作者 贺永东 刘宇 陈楚 吴大莉 He Yongdong;Liu Yu;Chen Chu;Wu Dali(College of Physical Sciences and Technology,Xinjiang University,Urumqi 830046,China;Jinchuan GroupCo.Ltd,Jinchang 737100,China)
出处 《稀有金属》 EI CAS CSCD 北大核心 2019年第4期382-389,共8页 Chinese Journal of Rare Metals
基金 国家自然科学基金项目(51661031 51861033)资助
关键词 氟盐法 木屑 共晶组织 Al-Ti-C母合金 fluorine salt method sawdust eutectic structure Al-Ti-C master alloy
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