摘要
采用自蔓延高温合成法（ＳＨＳ）以Ｂ_２Ｏ_３，ＴｉＯ_２，Ｍｇ为原料，制备ＴｉＢ_２陶瓷粉料。研究了Ｂ_２Ｏ３－ＴｉＯ_２－Ｍｇ（摩尔为１：１：５）合成系统在加热过程中的物理化学变化规律和ＴｉＢ_２粉末的显微结构特征。结果表明：加热过程中合成系统有预反应，它是由于少量Ｂ_２Ｏ_３还原造成的；掺加稀释剂对合成材料的显微结构有较大的影响并进而影响ＭｇＯ的化学清洗。微观分析表明：与元素合成的ＴｉＢ_２相比，ＳＨＳ还原合成的ＴｉＢ_２具有颗粒细小，分布均匀，无团聚的特点。
Self-propagating high-temperature synthesis(SHS) with reduction process was used to fabricate TiB_2 powder from B_2O_3-TiO_2-Mg system. The physico-chemical change during heating and microstructure of TiB_2 sample were studied. Results show that there is pre-reaction in this synthesis system, which is caused by reduction reaction of B_2O_3. Addition of diluent has a great effect on microstructure of synthesized materials which influences the chemical elimination of MgO. Microstructure analyses show that TiB_2 fabricated by SHS with reduction process is more fine in particle, uniform in distribution and free of agglomerates.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1996年第1期53-57,共5页
Journal of The Chinese Ceramic Society
关键词
高温合成
陶瓷粉末
二硼化钛
s: self-propagating high-temperature synthesis (SHS), reduction process, boron oxide,titania, magnesium, physico-chemical change, chemical elimination of magnesium oxide
