METHOD OF PRODUCING CERAMIC MATERIALS BASED ON COMPLEX OXIDES OF ABO3 Russian patent published in 2020 - IPC C04B35/645 C04B35/495 C04B35/45 C04B35/453 C04B35/472 C04B35/493 

FIELD: chemistry.

SUBSTANCE: invention relates to technology of producing complex compound ceramics (Na_0.85Li_0.15)NbO₃+SrO, YBa₂Cu₃O_7-δ, bismuth ferrite BiFeO_3, PbTiO₃, PbTiO₃-PbZrO₃-PbNb_2/3Mn_1/3O₃-PbNb_2/3Zn_1/3O₃. From the synthesized powder of the given stoichiometry, the work pieces are formed by pressing at room temperature, heated with simultaneous removal of the expansion-compression curve and isothermal holding at material transition section into plastic state at temperature corresponding to maximum compaction speed, but below recrystallisation temperature, under external load and at sintering temperature corresponding to specified composition, without load, after which it is cooled down to room temperature. At initial sealing stage, additional isothermal exposure without load is performed for 10–30 minutes at temperature, individual for each composition, which eliminates water-containing compounds and hydrolysis products of sintered phases. Temperature of this isothermal exposure is determined by curve of expansion-contraction in section with minimum change of dimensions of workpiece.

EFFECT: high density and mechanical strength of ceramic materials while maintaining a set of electrophysical parameters of each material, avoiding cracking and self-destruction of finished samples.

6 cl, 4 dwg, 3 tbl, 5 ex