Integrated P/M Processing for System Design of Nanocrystalline Ceramics

摘要

This article briefly describes the integration of the solid state powder processing by which one can provide a way of the systems design on bulk nanocrystalline ceramics in wide-spread applications. The rotating-arm reaction ball milling equipped with a PSZ tank realizes the efficient and high quality powder synthesis of amorphous PSZ-xmol%Al_2O_3 with x=20, 33 and 45 without an external Fe content. The millimeter wave sintering with multi-variable control is used to characterize the densification in the amorphous powder compact under a high frequency electric field by the relatively low activation energy. The spark pressure sintering causes a decrease in temperature necessary for full densification with decreasing height for the amorphous ZrO_2-20mol%Al_2O_3 product. Then, the thermo-mechanical nanoprocessing with current discharging enables to derive the strain rate sensitivity exponent for high-speed superplastic forming in nanocrystalline PSZ-20mol%Al_2O_3.