NaCl加入量对自蔓延高温燃烧合成法大规模制备的超细二硼化钛粉体性能的影响(英文)  

Effect of NaCl Addition on Properties of Submicron Titanium Diboride Powders Prepared by Self-propagating High-temperature Synthesis on a Large Scale

作　　者：喇培清[1] 欧玉静[2] 韩少博[1] 卢学峰[1] 魏玉鹏[1] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学石油化工学院,兰州730050

出　　处：《材料工程》2015年第7期14-20,共7页Journal of Materials Engineering

基　　金：国家自然科学基金(51164022);甘肃省教育厅硕导基金(1103-06)

摘　　要：以TiO2、B2O3、Mg粉为原料,引入稀释剂NaCl,通过自蔓延高温燃烧合成法宏量制备了亚微米TiB2粉体,并对其进行了SEM(扫描电镜)、EDS(能谱)、XRD(X射线衍射)和粒度分析。用原子吸收光谱测定了浸出产物TiB2粉体中杂质Mg,O的含量。结果表明:稀释剂加入量对样品形貌、粒度、物相有明显影响。随着NaCl含量的增加,制备的TiB2粉体的平均颗粒尺寸从496nm降低到268nm。产物浸出前主要由MgO,NaCl,TiB2和少量Mg3B2O6组成;浸出后前两相消失,产物为TiB2和少量Mg3B2O6。当原料中NaCl加入量k=0.5,1.0,1.5,2.0mol时,浸出产物中Mg3B2O6杂质含量极少,产品纯度均超过98%。稀释剂可以降低颗粒尺寸,提高产物纯度。采用此种自蔓延高温燃烧合成法可以大规模制备超细TiB2粉体。Submicron titanium diboride（TiB2）powders were prepared on macroscopic quantity via self-propagating high-temperature synthesis route using TiO2,B2O3 and Mg powders as raw materials and NaCl as diluent.Scanning electron microscope,Energy disperse spectroscopy,X-ray diffraction and particle size analysis were used to investigate the effect of NaCl on the resulting samples.The content of Mg and O impurities in the leached TiB2 powders was determined by atomic absorption spectrum.Results show that NaCl addition has an obvious effect on the morphology,average particle size and phase composition of the product.Average particle size of TiB2 powders decreases from 496 nm to 268 nm with the increase of NaCl content.All the samples before leaching consist of MgO,NaCl,TiB2 and a small amount of Mg3B2O6 phases.After leaching,the first two phases disappear and the main product is TiB2 and slight Mg3B2O6.When NaCl addition（k value）is 0.5,1.0,1.5,2.0mol,the leached product contains less Mg3B2O6 impurity phase,and product purity is over 98%.The addition of NaCl diluent is conductive to reduce the particle size and improve the product purity.Therefore submicron TiB2 powders can be prepared viathis approach on a large scale.

关 键 词：超细TiB2粉体 稀释剂 自蔓延高温燃烧合成法 形貌 相 

分 类 号：TB321[一般工业技术—材料科学与工程]