自蔓延高温还原合成法制备TiB2陶瓷粉末

采用自蔓延高温合成法（ＳＨＳ）以Ｂ２Ｏ３，ＴｉＯ２，Ｍｇ为原料，制备ＴｉＢ２陶瓷粉料。研究了Ｂ２Ｏ３－ＴｉＯ２－Ｍｇ（摩尔比为１：１：５）合成系统在加热过程中的物理化学变化规律和ＴｉＢ２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Ｂ２Ｏ３原造成的；掺加稀释剂对合成材料的显微结构有较的影响并进而影响ＭｇＯ的化学清洗，微观分析表明，与元素合成的ＴｉＢ２相比，ＳＨＳ还原合成的Ｔ

FABRICATION OF TiB_2 POWDER BY SHS WITH REDUCTION PROCESS

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.