碳化还原法制纳米碳化铬粉末.doc

2010届毕业生 毕业论文 题 目: 院系名称：材料科学与工程 专业班级： 材料0605 学生姓名： 学 号： 指导教师： 教师职称： 2010年月日过渡金属碳化物具有较高的熔点、硬度和高温强度，这些材料同样显示良好的电导率和热导率。这些优异的性能确保了它们在冶金、电子、催化剂和高温涂层材料等方面的广泛应用。 现在，各种各样合成碳化铬粉末的方法已经被研究，包括直接元素反应法、机械合金化法、程序升温反应法和气相还原碳化法。但是，这些方法在工业应用中受到了限制，主要由于团聚问题、较宽的粒径分布、低产量、复杂的监控和昂贵的成本。 本实验课题采用纳米碳黑和纳米氧化铬为原料，用碳化还原法制造纳米铬，分别在不同的C含量（26%，28%），不同的烧成温度（900℃，1000℃，1100℃）和不同的保温时间（30min,60min,90min）下制造纳米碳化铬，并用金相显微镜，XRD，红外线谱检测生成物的性质。 通过实验得出以下结论：在C含量为28%，烧成温度为1100℃，保温时间为90min时，生成物不含其它杂质相，为单一的Cr3C2，纳米碳化铬的各种性质最趋近于理想值。 Title：Preparation of nano carbon reduction chromium carbide powder Abstract Transition metal carbides has a high melting point, hardness and high temperature strength, these materials also show good electrical conductivity and thermal conductivity. The excellent performance to ensure that their metallurgy, electronics, catalysts and high-temperature coating materials such as extensive use of Now, the various chromium carbide powder synthesis methods have been studied, including direct element reaction, mechanical alloying, temperature-programmed reaction and carbonation gas reduction law. However, these methods in industrial applications has been limited, mainly due to reunion, a wide size distribution, low yield, complicated and expensive monitoring costs. In this study, subjects using nano-carbon black and nano-chromium oxide as raw materials, manufacture nano-carbon chromium reduction method At different C content (26%, 28%), different sintering temperature (900 ℃, 1000 ℃, 1100 ℃) and different holding time (30min, 60min, 90min) of the manufacturing nano-chromium carbide, with metallographic microscopy, XRD, infrared spectral detection of resultant nature. The experiment shows the following conclusions: the C content was 28%, sintering temperature is 1100 ℃, holding time was 90min, the resultant free of other impurity phase, various properties of chromium carbide