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在热力学分析的基础上 ,以含钛高炉渣为主要原料 ,采用碳热还原氮化法合成了 (Ca,Mg)α′ Sialon AlN TiN粉。确定了合成过程的最佳工艺参数 :反应温度 14 80℃ ,保温 10h,配碳量为理论值的 1.5倍 ,氮气流量 4 0 0mL/min。采用X射线衍射仪和扫描电镜研究了合成产物的相组成和显微结构。结果表明 :产物中除有主要物相α′ Sialon、AlN和TiN外 ,还有少量 β SiC ,15R和 β CaSiO3 等杂质相。其中 ,(Ca,Mg)α′ Sialon多以片状而AlN多以球形或短柱状形式存在。EDS分析结果表明 ,Ca2 + 、Mg2 + 都进入了α′ Sialon晶格中 ,但Ca2 + 的固溶量远高于Mg2 + 。
Based on the thermodynamic analysis, (Ca, Mg) α ’Sialon AlN TiN powder was synthesized by carbothermal reduction nitridation using titanium-containing blast furnace slag as the main raw material. The optimum technological parameters of the synthesis process were determined: the reaction temperature was 1480 ℃, the temperature was maintained for 10h, the carbon content was 1.5 times the theoretical value, and the nitrogen flow rate was 400mL / min. The phase composition and microstructure of the synthesized product were investigated by X-ray diffraction and scanning electron microscopy. The results show that in addition to the main phases α ’Sialon, AlN and TiN, there are a few impurities such as β SiC, 15R and β CaSiO3. Among them, (Ca, Mg) α ’Sialon mostly in sheet form and AlN mostly spherical or short columnar form. The results of EDS analysis showed that Ca2 + and Mg2 + all entered the α ’Sialon lattice, but the amount of dissolved Ca2 + was much higher than that of Mg2 +.