配料组成对含钛高炉渣合成TiN/(Ca,Mg)α-sialon粉的影响

EFFECTS OF INITIAL COMPOSITIONS ON TiN/(Ca,Mg) α-SIALON POWDERS SYNTHESIZED FROM TITANIUM-BEARING BLAST FURNACE SLAG

利用X射线衍射、扫描电镜和能谱分析等手段研究了配料组成(x=0.3～2.0)对含钛高炉渣合成TiN/(Ca,Mg)α-sialon粉末相组成、晶胞参数和显微结构的影响.结果表明:随x值增加,产物中α sialon,TiN,AlN和15R含量逐渐增加,而β-sialon和SiC含量逐渐减少.在x=1.0时,α-sialon的相对含量达最大值(65%左右).随Ca2+和Mg2+固溶量的增加,(Ca,Mg)α-sialon晶胞变大.能谱分析结果证明:实际固溶于α-sialon晶格中的Ca2+和Mg2+含量低于配料的x值,并且Ca2+的固溶量大大高于Mg2+的.当x≥1.4时,产物中长柱状α-sialon晶粒数量增加.

Effects of initial compositions (x=0.3-2.0) on phase compositions, lattice parameters and microstructure of TiN/(Ca,Mg) α-sialon powders synthesized from titanium-bearing blast furnace slag were studied by X-ray diffraction, scanning electron microscope and energy dispersive X-ray analysis. Results show that the contents of α-sialon, TiN, AlN, and 15 R phase in reaction products increase with increasing of x values, while the contents of β-sialon and SiC decrease. When x=1.0, relative amount of α-sialon reaches to 65% approximately. With increasing of Ca2+ and Mg2+ solid solubility, lattice cell of (Ca,Mg) α-sialon expends. Energy dispersive X-ray analysis results approve that Ca2+ and Mg2+ amounts of bringing into α-sialon lattice are lower than initial x values actually and the solubility of Ca2+ is higher than that of Mg2+ in the α-sialon lattice. α-sialon grains of long-column shape increase when x≥1.4.