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分别采用3种方法在不同烧结温度下制备Gd211粉末。利用X射线衍射(XRD)、扫描电镜(SEM)、激光粒度分析等手段对3种制备方法进行比较研究。Gd211的成相温度约在900℃以上。随着烧结温度的升高,粉末的碳含量明显降低,但粒子尺寸逐渐增大,且由均匀的球形颗粒变成越来越不规则的大颗粒。3种制备方法相比,草酸盐共沉淀法相对复杂,但合成的材料颗粒较细且均匀,碳含量很低,是最理想的制备Gd211的方法。
Three methods were used to prepare Gd211 powders at different sintering temperatures. The three preparation methods were compared by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and laser particle size analysis. The phase transition temperature of Gd211 is about 900 ℃. As the sintering temperature increases, the carbon content of the powder decreases significantly, but the size of the particles gradually increases, and the uniform spherical particles become more and more irregular large particles. Compared with the three preparation methods, the oxalate coprecipitation method is relatively complex, but the synthesized material particles are thin and uniform, and the carbon content is very low, which is the most ideal method for preparing Gd211.