| 摘要 |
Nickel cermet consisting of from 35 to 70% by weight of a metal nickel phase and 65 to 30% by weight of a zirconium oxide (zirconia) phase stabilized in cubic form by 5 to 20 moles of yttrium oxide (yttria) for each 100 moles of zirconium oxide, the two phases, upon X ray diffractometric analysis, being distinct and homogeneously distributed, characterized in that it is obtained by a process comprising the following steps: a) preparation of a suspension of zirconia stabilized by yttria (YSZ), by dispersing zirconia stabilized by yttria (YSZ), having a particle size of between 1 and 40 m mu , in dimineralized water; b) preparation of a solution of nickel by dissolving a hydrsoluble and thermodecomposable nickel salt in demineralized water; c) mixing of the nickel solution with the dispersion obtained in step (a) and homogenization of the resulting dispersion by magnetic stirring for a time of between 5 and 40 minutes; d) elimination of the water from the dispersion obtained in step (c) by a system capable of operating without, or almost without, decomposition phenomena obtaining a solid consisting of particles of zirconia stabilized by yttra (YSZ) covered with the nickel salt; e) calcination under oxidating conditions of the solid obtained in step (d) to cause the formation of a solid consisting of particles of YSZ covered with nickel oxide; f) treatment with hydrogen of the solid obtained in step (e) to reduce the nickel oxide to metal nickel. |
