電気泳動堆積法による窒化ケイ素セラミックスの作製

抄録

Surface coating of Si₃N₄ powder with an alumina precursor was achieved by a sol-gel method using aluminum isopropoxide. Electrophoretic data showed the surface-coated Si₃N₄ powder behaved like alumina. Consolidation of the surface-coated powder was attempted by an electrophoretic deposition (EPD) technique. EPD rate was improved for the surface-coated powder. Sintering characteristics and fracture toughness were investigated for EPDed compacts. It was demonstrated that the surface coating of Si₃N₄ powder with alumina precursor had the advantage of not only the improvement of suspension stability, but also the addition of sintering aid.