( 1. 东北大学 材料与冶金学院，沈阳 110004;
2. 辽宁科技学院冶金工程系，本溪 117022)
摘 要: 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1 480 ℃，保温10 h，配碳量为理论值的1.5倍，氮气流量400 mL／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+。
关键字: 含钛高炉渣; 碳热还原氮化; (Ca, Mg)α′-Sialon-AlN-TiN
powders from titanium-bearing
blast furnace slag
（ 1. School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China;
2. Metallurgy Engineering Department,
Liaoning Institute of Science and Technology, Benxi 117022, China）
Abstract: Based on thermodynamic analysis, (Ca, Mg)α′-Sialon-AlN-TiN composite powders were prepared by carbothermal reduction-nutridation from titanium-bearing blast furnace slag. The reaction process of synthesizing (Ca, Mg) α′-Sialon-AlN-TiN powders was confirmed and the optimum synthesizing process parameters were: reaction temperature 1 480 ℃, holding time 10 h, 1.5 times of theoretical consuming carbon mass, nitrogen gas flow of 400 mL/min. The phase composition and microstructure of sintered materials were investigated by X-ray diffraction and scanning electron microscope. The results show that the final products consist mainly of α′-Sialon, AlN and TiN. Small amounts of β-SiC, 15R and β-CaSiO3 were also identified in the synthesized powder. (Ca, Mg)α′-Sialon presented flaky grains and AlN taken on globular or short columnar shape mainly. EDS analysis result reveals that the solubility of Ca2+ is much higher than that of Mg2+ in the α′-Sialon lattice.
Key words: titanium-bearing blast furnace slag; carbothermal reduction-nitridation; (Ca, Mg)α′-Sialon-AlN-TiN
