含钛高炉渣合成(Ca,Mg)α′-Sialon-AlN-TiN粉末

来源期刊:中国有色金属学报2004年第12期

论文作者:姜涛 薛向欣

文章页码:2009 - 2015

关键词:含钛高炉渣; 碳热还原氮化; (Ca, Mg)α′-Sialon-AlN-TiN

Key words:titanium-bearing blast furnace slag; carbothermal reduction-nitridation; (Ca, Mg)α′-Sialon-AlN-TiN

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+

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.

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 主办 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(湘)字第028号   湘ICP备09001153号