AEROSOL DEPOSITION METHOD (ADM) FOR NANO-CRYSTAL CERAMICS COATING WITHOUT FIRING

摘要

Aerosol deposition method (ADM) for shock-consolidation of fine ceramics powder to form dense and hard layers is reported. Submicron ceramic particles were accelerated by gas flow in the nozzle up to velocity of several hundred m/s. During interaction with substrate, these particles formed thick (10 ～ 100 μm), dense, uniform and hard ceramics layers. Experiments were fulfilled at room temperature. The results of fabrications, microstructure and mechanical properties of oxides (Al_2O_3; (Ni,Zn)Fe_2O_3; Pb(Zr_(0.52),Ti_(0.48))O_3 and non-oxide (AlN; MgB_2) materials are presented. Every layer has polycrystalline structure with nano-meter order scale.