【作者】 王伟生；

【导师】 彭会清；

【作者基本信息】 武汉理工大学 ， 矿物加工工程， 2007， 博士

【摘要】 稀土元素因其独特的物理化学特性,因而在陶瓷色料领域有着十分重要的用途和地位。含稀土元素的红色等陶瓷色料一直是近年来研究的热点。本文针对我国的优势资源钇,进行了含钇陶瓷色料的制备研究,探讨了色料色度的测试方法;同时对我国现行稀土矿分解工艺经济指标进行了分析比较,具体包括:选用不同的沉淀剂,利用正交实验方法,研究了共沉淀法制备Y-Al-Cr系色料的工艺,利用差热分析研究了所获前驱体的分解温度,使用样品X射线衍射分析、反射光谱分析及粒度分布测试研究了所制备样品的物相、光反射特性等物理性质。结果表明,沉淀法合成的色料颜色为浅灰色至深灰色,同时与固相法合成的颜色进行了比较。矿化剂实验表明,合理的矿化剂可以大大降低色料的合成温度,改善所制备色料的色度。以碳酸钙和氟化钠为矿化剂,加入量分别为氧化钇与氧化铝总质量的4.3%和3.1%,在1300℃制得的色料,可获得较好色度的红色色料。通过对比传统反射光谱测试和现代数码技术测试实验,对比两者的测试特点,结果表明,利用传统方法反射光谱的一阶倒数,可以很好地说明反射率或色度的变化,现代数码测试结果可以较好地反映实验结果,且方便快捷。针对Y-Al-Cr体系色料,探讨了其他一些镧系元素La、Ce、Pr、Sm、Eu、Gd、Dy、Ho、Er、Yb等元素替代Y的新体系色料的合成,含Dy、Ho、Yb的色料具有较好色度。同时研究了Fe、Co、Mn、Cu等元素替代Y-Al-Cr中的Cr对色料颜色的影响。针对我国常见的稀土矿的一些分解工艺,分析比较了其经济效益。更多还原

【Abstract】 Rare earths have important use in the ceramic pigments because of its special physical and chemical properties. The ceramic colorants doped with rare earths have attracted much interest in the recent years. In this paper, the preparation and the testing methods of the chroma of the ceramic colorants doped with yttrium have been studied considering the rich yttrium resource in country. Furthermore, the economic indicator of the resolving technology of the rare earth mines have been also analyzed and compared. The details have been described as below:The technology of Y-Al-Cr colorant prepared by the co-precipitation method have obtained with different precipitants by regular design experimental conditions method. The resolving temperature of van system have been measured by DTA. The physical properties such as phase and light reflect properties was studied by the method of XRD, reflect spectra analysis and particle size distribution test. The results show that the color of the samples were turned from French grey to heavy gray, which was also compared with that obtained by the solid state method. Additives experiment show that suitable additives can decrease the synthesis temperature of the colorants while improve the chroma of the samples. The red colorants with good chroma can be derived in the 1300℃with the calcium carbonate and rluorol as additives, whose weights were 4.3% and 3.1% of the total weight of the yttria and alumina, respectively.Comparing the conditional reflect spectra testing method with modern digital testing technology, the results shows that the reflectivity or the variation of the chroma can be well demonstrated by 1st rank derivative of the conditional reflect spectra testing method, while the experimental results can be conveniently and rapidly expressed by the modern digital testing technology.The samples in which the Y was substituted with other rare earth (La, Ce, Pr, Sm, Eu, Gd, Dy, Ho, Er, Yb et.al) in Y-Al-Cr system were also synthesized. The results show that the colorants doped with Dy, Ho, and Yb have good chroma. The influences of the Fe, Co, Mn and Cu on the color of the colorant have been also discussed.In the end, the economic benefit of the resolving technology of the common rare earth mines has been analyzed.更多还原