??????? ???????? ?? ?????? ?????? ????? ??????? ????????????? ?? ?????????????????? ????????. ??????? ????? ?????????? ? ???????? ????????????, ???????? ? ????????? ???????????? Y2O3 ???????? ????????? ?????? ????????? ???????????? [1]. ? ??????? ????????? ????? ???????? ??????? ??????? ??????? ????????? ??????. ????????? ???????? (???) ???????? ??????? ? ????????? ??????????? ?????????. ? ??'???? ? ???, ????? ???????? ?????????? ? ??????????? ?????? ?????? ?? ??????? ???????? ??????? ???? ? ??????? ????????? ???????? [2]. ????? ?????? ? ??????????? ?????? ???????? ???????? ? ???? ?? ??????? ?? ??????? ??????????? ???????? Y2O3. ? ????? ?????? ???? ?????????? ?????????? ???????? ??????????? ???????? ?????? ????? (Nippon, Stanford, Solvay ? US RN) ????? ?????? ??? ?????? ??????. ? ?????? ???????, ?? ?????? ????????, ???? ?????? 3 ???.% ZrO2. ??????, ????????????? ?????????? ? ???????? ???????????? ???????????, ??????? ?? ??????? ??? ??????????? 1600 °? ???????? 4 ???. ?? ? ??????? ??? 1735°? ???????? 32 ???. ?? ??????? ????? ?????????? ?????????? ???????? ????? ??????????????????? ?????? (80 ??./??. ???????? 22 ???.). ????? ????????????? ???????? Stanford ???????????????? ????????? ??????? ? ???????? ???????????, ??? ?? ?????????? ??? ??????????. ?????????? ????? ???????? ????? ?????????, ?????????? ????? ?? ???????? ? ?????? ?'???. ????? ???? ???????, ????????? ????????? ?? ???????, ???? Nippon-???????? ???????????????? ??????? ????????? ? ?????????? ??????????????? ? ??????????? ????????? ???????? ??????? ??????????? ????? ??????? ???????? (???) ?? ??????? ????????. ?????? ???????? ????? ???????? ???????? Solvay ? US RN ?????????? ?? ????? ??????????????? ? ??????? ????????????? ??????? ??????????? ??????????. ????? ?????, Nippon Y2O3 ???? ?????? ??? ????????? ??????????. ????????? ????? ???? ?????? (????????? ? ???) ?? ????????? ??????? ? ??????????? ????????-???????? ???????? Y2O3. ??????????? ?????????? ????? ????????? ???????? ? ??????? ?????????? ?? ???????? (300 ??./??., 65 ??.). ?? ????? ???? ?????? ????? ???????? ???????? 21.3 ?2/?, ? ???????? ?????? ???????? ??????? 480 ??. ???????? ????????? ?????? ?? 200 ? 100 ??./??. ?????????? ?? ?????????? ??????? ????????, ? ?????????? ???? ?????? ?? 10 ??? ??????????????? ???????????? ???????? ????? ?????? ???????? ??????? ????? ????????. ???????? Y2O3, ???????? ? ????? ??????? ??????? ?????????? ???????? ??? 1735 °? ???????? 32 ???, ???????????????? ??????? ????????? ????????? 100±0,5% ? ???????? ???????? ???????????? ????? ???? ??????????????? ??????? (78,1 % ??? 1100 ??, ?? ??????? 95,6 % ??? ???????????? ????????). ??????????? ???????? ?? ????????? CNR-ISSMC (?????? CNR-ISTEC), ??????, ?????? ? JECS Trust (???????? No. 2021293) ??????????: [1]J. Kong, D.Y. Tang, J. Lu, et al, Appl. Phys. 79, 449-455 (2004). [2]S. Hríbalova, W. Pabst, J. Eur. Ceram. Soc. 41, 2169-2192 (2021)

In this work the technological issues related to the production of tape cast large-area porous stainless steel supports for Solid Oxide Fuel Cells (SOFC) applications were carefully investigated. The slurry formulation was optimized in terms of amount and nature of the organic components needed: rice starch and poly methyl metacrylate were found to be, respectively, the most suitable pore former and binder because easily eliminated during the thermal treatment in reducing atmosphere. The compatibility of the binder system chosen with the most widely used solvents for screen printing inks was also evaluated. Finally the influence of the sintering temperature and of the refractory supports to be used during the thermal treatments onto the production of porous stainless steel supports was discussed. The whole process optimization allows to produce flat, crack-free metallic substrate 900-1000 gm thick, dimensions up to 5x5 cm and with a tailored porosity of 40% suitable for SOFCs application.

In this paper, we report a new synthesis route to produce boron powders characterized as being amorphous and having very fine particle size. This route has been developed to improve the performances of superconducting MgB2 powders, which can be directly synthesized from this nanostructured boron precursor by following the ex-situ or the in-situ PIT method during manufacturing of tapes, wires, and cables. All the procedure steps are explained, and the chemical-physical characterization of the boron powder, using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy techniques, is reported. Furthermore, a comparison with commercial boron is given. Preliminary results of the magnetic and electrical characterization, such as critical temperature TC and transport critical current density JC t, for the MgB2 tape are reported and compared with those for the tape prepared with commercial boron.

The preparation of BSCCO 2223 superconducting powder was studied with addition of V2O5 ranging from 0.3 to 0.5 molar index. Various compositions were prepared both containing and without Pb and subsequently treated with different firing cycles, to promote the incorporation in lattice sites of vanadium atoms. Different densification procedures were attempted and final bulk samples characterized to evaluate microstructural, mechanical and electrical properties. The addition of vanadium was found to increase the formation rate of high Tc phase and about 90% of 2223 phase has been obtained in 80 h. However, this element was found to present an outstanding segregation trend at grain boundaries (especially with Sr) and to be responsible of a marked delay in 2223 phase formation in respect to lead-doped samples. Transport properties seem positively affected even if considerable contamination at grain boundary and lowering in offset critical temperature are unavoidable.