燃烧合成TiB_2-Al_2O_3陶瓷复合粉体及其表征

Preparation and Characterization of TiB_2-Al_2O_3 Composite Powder by Combustion Synthesis Process

采用TiO2-B2O3-Al还原体系,通过燃烧还原技术制备了TiB2-Al2O3陶瓷复合粉体。利用XRD,XPS和SEM技术对合成粉体的相组成、化学组成及宏观组织结构进行了分析。复合粉的显微结构由TEM和HREM进行表征。结果表明,用燃烧合成法在420℃~700℃之间可制得TiB2-Al2O3陶瓷复合粉体。该粉体仅由TiB2和Al2O3两相组成,颗粒分布较均匀。由于TiB2与Al2O3间形成了结合良好的界面,颗粒间彼此能有效地抑制晶粒长大,从而使TiB2-Al2O3陶瓷复合粉的粒径减小,颗粒平均粒度在3μm^5μm之间。

The combustion synthesis reaction with reductive process was used to produce TiB2-Al2O3 composite powders from TiO2-B2O3- Al system. The phase, the chemical composition and the macrostructure were analyzed by XRD, XPS and SEM. The microstructure of the composite powders was characterized by TEM and HREM. The results show that the TiB2-Al2O3 composite powders could be obtained by combustion synthesis method between 420℃-700℃. The composite powder was made up of TiB2 and Al2O3 only, the particle distribution was uniform. Because of the good interface formation between TiB2 and Al2O3 particle during the synthesis reaction, which made TiB2 particles separated each other by Al2O3 particles and could inhibit effectually the grain growth in the particles and finally lead to decrease in the particle size, their mean particle size was in the range of 3μm-5μm.