【作者】 甘明亮；

【导师】 李亚伟；

【作者基本信息】 武汉科技大学 ， 材料学， 2006， 硕士

【摘要】 TiC、TiN和Ti（C,N）系列含钛化合物具有熔点高、硬度大、化学和热稳定性好等一系列优异的性能,在机械、化工、微电子等领域有着广泛的应用前景。如果以TiC、TiN以及Ti（C,N）为添加剂与一些耐火材料复合,则可能制得强度大、导热性能高、抗铁水侵蚀性能好的复合耐火材料,这将是一种具有很大发展前途的材料。本研究工作分为两部分:第一部分研究了不同气氛、处理温度以及还原剂种类对合成TiC、TiN及Ti（C,N）的影响,从热力学角度分析了在氮气和埋炭气氛下合成TiC、TiN及Ti（C,N）的可行性,借助XRD和SEM和TEM探讨了合成反应的反应机理;第二部分研究了TiC、TiN和Ti（C,N）等添加剂对炭砖性能的影响以及使用预合成颗粒作为骨料对炭砖性能的影响。通过以上研究,得出如下主要结论:1.氮气气氛下,C与TiO₂在各个温度点下均能发生反应,在1200℃下,产物中除了TiN外,还有少量Ti₃O₅。随着处理温度的升高,TiO₂全部转化为TiN。而在埋炭气氛中,各个温度点下均有TiO₂剩余,且随着处理温度的升高,产物中TiN的含量逐渐增加。在实际过程中,碳热还原法得不到纯净的TiN,实际产物应该为TiN和TiO的固溶体。2. Al和TiO₂在氮气气氛中各个温度点下反应进行的都很完全。而在埋炭气氛下,在1300℃和1400℃下均有少量TiO₂剩余,随着处理温度的升高,TiN的含量逐渐增加,同碳热还原法一样,铝热还原过程中也得不到纯净的TiN,实际产物也应该为TiN和TiO的固溶体。3. C、Al还原TiO₂在氮气气氛中各个温度点下反应进行的都很完全,产物均为Ti（C,N）。而在埋炭气氛下中,产物均为Ti（C,N）,在1300℃和1400℃下均有少量TiO₂剩余,随着处理温度的升高,TiO₂的含量逐渐减少。4. C、Si还原TiO₂在氮气气氛中各个温度点下TiO₂均已转化成为Ti（C,N）,埋炭气氛中,在各个温度点下都有少量TiO₂剩余,产物均为Ti（C,N）。5.处理温度对合成反应有重要的影响,处理温度高,TiO₂的转化率也越高,同时,对于同一组试样,在相同的处理温度下,氮气气氛下要比在埋炭气氛下反应的更加完全。6.添加剂Al₂O₃、TiC、TiN和Ti（C,N）能有效的改善炭砖的各项常规物理性能,用TiO₂作为添加剂的试样的物理性能也有一定程度的提高,但是效果不明显,用Al和TiO₂作为添加剂的试样的各项物理性能要优于只用TiO₂作为添加剂的试样,接近于用TiC、TiN和Ti（C,N）作添加剂的几组试样。用预合成颗粒作为骨料的试样的各项常规物理性能均比使用电锻煤颗粒作为骨料的试样要差,预合成颗粒方法还有待改进。更多还原

【Abstract】 Titanium carbide, titanium nitride and titanium carbonitride have an extensive application in mechanism, chemical and microelectronic industry for they have a series of excellent properties such as high melting point, big hardness, good chemical and thermal stability. It may manufacture a composite refractory material with high intensity, high thermal conductivity and high corrosion resistance in adding them into refractory materials as additives. It maybe a refractory materials with developmental future.The research is divided into two parts: The first part is researching the influence of formationing on TiC, TiN and Ti（C,N） in different treating temperature, atmospheres and reducing agent. It analyzed the possibility of synthesizing the TiC, TiN and Ti（C,N） in nitrogen condition and coke bed condition from the thermodynamics view at first, then probed the reactive mechanism of reductive reaction by XRD, SEM and TEM. The second part analyzed the influence on properties in adding different additives to carbon blocks such as TiC, TiN and Ti（C,N） and the influence on properties of carbon block using prefabricated grain as aggregate. The main results are showed as follows:First, carbon could react with titanium dioxide in nitrogen condition from 1200℃to 1500℃. Beside TiN, there is a small amount of Ti₃O₅ in product at 1200℃. All of TiO₂ is turned into TiN with the rising of treating temperature. However, TiO₂ is surplus at each temperature in coke bed condition, and the content of TiN is increased gradually with the rising of treating temperature. Carbonthermal reduction method can not get pure TiN in practicable reaction process. The real results should be a solid solution of TiN and TiO.Second, aluminium and titanium dioxide could react completely at each temperature in nitrogen condition. But TiO₂ is surplus to a small amount at 1300℃and 1400℃in coke bed condition. The content of TiN is increased gradually with the rising of treating temperature. The same as carbonthermal reduction method, aluminothermic reduction method can not get pure TiN either, The real results should be a solid solution of TiN and TiO too.Third, the reaction of C, Al and TiO₂ could react completely at each temperature in nitrogen condition. The products are all Ti（C,N）. But TiO₂ is surplus to a small amount at 1300℃and 1400℃in coke bed condition. the products are Ti（C,N） at each temperature. the content of TiO₂ is reduced gradually with the rising of treating temperature.Fourth, the reaction of C, Si and TiO₂ can react in nitrogen condition. The products are Ti（C,N） at each temperature. TiO₂ is surplus to a small amount at each temperature in coke bed更多还原