【作者】 张炳；

【导师】 王淑兰；

【作者基本信息】 东北大学 ， 物理化学， 2008， 硕士

【摘要】 钛及其合金具有质量轻、比强度高、耐蚀性强、抗氧化性好等优点,目前主要应用于航空、汽车、船舶、医疗、化工、建筑、体育及日常生活等方面。但现行Kroll法生产钛的工艺存在工序复杂、不能连续化生产等缺点,致使钛的成本居高不下,极大的限制了钛的广泛应用。剑桥大学提出的FFC法,具有生产流程短、成本低、无污染等优点,被认为是最有希望取代Kroll法的钛生产工艺。而FFC法在合金制备方面更有优势,可以由混合金属氧化物一步制备出钛合金。钛硅合金具有较好的高温稳定性、较高的高温强度和良好的抗氧化能力,可作为高温结构材料；同时由于其低电阻和高温稳定性,在集成电路接触和互连技术中发挥了重要的作用。本课题采用FFC法,由TiO2和Si02混合物来制备钛硅合金。实验过程主要包括阴极制备和电解两个部分。阴极制备流程包括如下步骤：均匀混合TiO2、SiO2粉末；添加1%(质量比)的聚乙烯醇作为粘结剂；20 MPa压力下压制成形；1200℃下烧结4h；烧结后的片体和钼丝、镍硅丝组装成复合阴极。适宜的电解条件为：以烧结的TiO2-SiO2片体为阴极,石墨坩埚为阳极,电解温度900℃、电解电压3.0 V。电解10 h制得了钛硅合金,经过XRD分析其成分为TiSi2和Si,同时发现钛硅的合金化反应经历了下面几个阶段：Ti5Si3→Ti5Si3+TiSi2→TiSi2→TiSi2+Si。更多还原

【Abstract】 Titanium and its alloys have many desirable properties such as light weight, high strength, good corrosion and oxidation resistance etc, and have been used mainly in aviation, automobiles, ships,medicine, chemical industry, buildings, sports and daily life. The use of titanium has been greatly restricted because of the high production cost caused by the Kroll method which is of complicated procedures,intermittent operations and so on.The FFC method proposed by Cambridge University, has many advantages such as short production process, low cost and non-pollution and is believed as the most hopeful technology for sponge titanium production instead of the Kroll method. The FFC methode has even more advantages while for alloy preparation, because it can reduce the mixture of metal oxides to alloy by one step. Ti-Si alloy is used as construction materials owing to its good stabilility, strength and oxidation resistance at high temperature,and it also plays an important role in the contact and interlinkage technology of integrate circuit because of its low electrical resistivity and high-temperature stability.In this work, the mixture of TiO2 and SiO2 was used to produce Ti-Si alloy by the FFC method. The experiment progress mainly includes two parts:cathode preparation and electrolysis.The flow of cathode preparation is as followings:mixing TiO2 and SiO2 powder evenly, and adding 1%(mass ratio) polyvinyl alcohol as adhesive to the mixture; pressing the mixture to pellets at 20 MPa;sintering the pellets at 1200℃for 4 h; then connecting the sintered pellet, Mo wire and Ni-Si wire to form a cathode.The electrolysis conditions are optimized as follows:Sintered TiO2-SiO2 pellet was as the cathode and graphite crucible as anode. The electrolysis voltage and temperature are 3.0 V and 900℃.Ti-Si alloy was prepared after 10 hours’ electrolysis. The electrolysis product was analysed by XRD(X-ray diffraction) and is consisted of TiSi2 and Si. It is also found that the alloying process of Ti-Si follows the followed stages:Ti5Si3→Ti5Si3+TiSi2→TiSi2→TiSi2+Si.更多还原