基于Ti-Si-Fe合金与B粉的TiB_(2)熔盐法合成制备研究  

Molten salt assisted preparation of TiB_(2) powder from Ti-Si-Fe and B

作　　者：程登峰 张锦化[1] 王景然[1] 柯昌明[1] Cheng Dengfeng;Zhang Jinhua;Wang Jingran;Ke Changming(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Jiujiang Golden Egret Hard Material Co.,Ltd.,Jiujiang 332000,Jiangxi,China)

机构地区：[1]武汉科技大学,省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]九江金鹭硬质合金有限公司,江西九江332000

出　　处：《钢铁钒钛》2022年第2期48-55,共8页Iron Steel Vanadium Titanium

基　　金：国家十一五重点支撑计划项目(2006BAB02B02);国家十二五科技支撑计划项目(2011BAB05B05);攀枝花市科技局重大科技攻关计划项目(2008CY-G-1)。

摘　　要：以从高钛型高炉渣中提取的Ti-Si-Fe合金和无定形硼粉为原料,在NaCl-KCl熔盐中合成了TiB_(2)粉体,研究了反应温度、保温时间、熔盐量、B/Ti摩尔比对反应进程的影响。结果表明:提高反应温度或延长保温时间均能促进反应进行,在850℃时开始有TiB_(2)生成,1100℃时反应完全。熔盐有促进反应过程的作用。元素分布表明,含Fe的颗粒同时含Si,这与产物FeSi_(2)相对应;大多数颗粒同时含有Si、Ti、B,说明在这些颗粒中产物TiB_(2)和Si是伴生在一起的;少数颗粒只含有Ti、B,对应产物TiB_(2)。产物颗粒形貌有两种,一种颗粒表面呈龟裂状,有裂缝或微米级孔洞与颗粒内部相连,这种颗粒同时含有TiB_(2)、Si或FeSi_(2);另一种颗粒由片状TiB_(2)组成。Ti-Si-Fe合金与B在熔盐中的反应机制为:在熔盐促进作用下,含钛物中的Ti与B反应生成TiB_(2),释放出Si及FeSi_(2),大部分TiB_(2)以Si、FeSi_(2)为骨架形核并长大,从而维持了颗粒原有形貌,少量TiB_(2)在熔盐中形核并长大形成片状TiB_(2)的聚集体。合金相与B反应完全的先后顺序依次为:Ti5Si3、TiSi、TiFeSi_(2)和TiSi_(2)。TiB_(2) powders were synthesized in NaCl-KCl molten salt by amorphous boron and Ti-Si-Fe alloy extracted from high titanium blast furnace slag.The effects of reaction temperature,holding time,molten salt amount and mole ratio of B to Ti on the reaction process were investigated.The results show that increasing the reaction temperature or extending the holding time can promote the reaction process.TiB_(2) begins to form at 850℃and the reaction completes at 1100℃.Molten salt can facilitate the reaction process.The distribution of elements shows that the particles containing Fe also contain Si,corresponding to the product FeSi_(2).Most of the particles contain Si,Ti and B at the same time,indicating that TiB_(2) and Si are associated in these particles.A few particles contain only Ti and B,corresponding to TiB_(2).There are two kinds of particle morphology of the product.One kind of particle presents cracking appearance with cracks or micron holes connected to the interior,which contains TiB_(2),Si or FeSi_(2).The other particle is composed of flake TiB_(2).The reaction mechanism of Ti-Si-Fe alloy with B in molten salt is described below.First of all,titanium reacts with B to form TiB_(2),then Si and FeSi_(2) are released.Most TiB_(2) nucleate and grow with Si and FeSi_(2) as the skeleton which maintain the original morphology of Ti-Si-Fe particles.A small amount of TiB_(2) nucleate and grow in molten salt to form flake TiB_(2) aggregates.The sequence of reaction between alloy phase and B is Ti5Si3,TiSi,TiFeSi_(2) and TiSi_(2).

关 键 词：二硼化钛 熔盐法 Ti-Si-Fe合金 B粉 高钛型高炉渣 

分 类 号：TF823[冶金工程—有色金属冶金] TQ174.4[化学工程—陶瓷工业]