PROCESSING FINE CERAMIC POWDERS BY A COMBINATION OF SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS AND HIGH ENERGY MILLING

摘要

Processing TiB2 ceramic powders by a combination of self-propagating high-temperature synthesis (SHS) and high energy milling/mechanical alloying (MA) has been studied in this work. The milling time of the unreacted powders was noted to influence the reaction parameters of the self-propagating high-temperature synthesis. As the milling time was increased, the reactant size was decreased due to the collision between the powders and the balls. A decrease in the reactant size increased the reactivity and the combustion temperature/propagation velocity, further influencing the microstructure/properties of the synthesized products. Fine TiB2 ceramic powders were spontaneously formed when the high energy milling time was further increased to a critical time. In addition to self-propagating high-temperature synthesis and high energy milling, other techniques using the exothermic reaction to process materials are also discussed in this article. [References: 18]