METHOD FOR MAKING PIEZOCERAMIC THREE-DIMENSIONAL ARTICLES FROM POWDER COMPOSITIONS Russian patent published in 2003 - IPC

FIELD: processes of laser synthesis of three-dimensional articles, models of machine parts by selective laser sintering in machine engineering and instrument making, manufacture of electroacoustic piezotransducers of powdered compositions. SUBSTANCE: method for making piezoceramic three-dimensional articles of powdered compositions comprises steps of mixing powders screened until predetermined fraction; preliminarily annealing components of prepared mixture; sintering, compacting, firing and further mechanically working article. Steps of sintering, compacting, firing and mechanically working are realized by selective laser sintering process during several passes with different temperature modes in separate passes. Additional infiltration of sintered article with filler is performed. Process of selective laser sintering also comprises preliminary furnace annealing. EFFECT: significantly reduced time period, enlarged functional characteristics of materials due to using selective laser sintering process. 4 cl, 3 ex, 1 dwg, 2 tbl _