Powders of garnet-type complex oxide Y_2.5Nd_0.5Al₅O₁₂ (YAG:Nd) – x vol% W, Mo (x = 0, 10, 20) were obtained using wet chemistry techniques and precipitation of the metal phase from salt solutions. After synthesis, nanoparticles of YAG:Nd garnet cluster into submicron agglomerates. Spark Plasma Sintering (SPS) was used to obtain fine-grain ceramic-metal composites YAG:Nd – (W, Mo) with a relative density of ∼99%. The effect that metal concentration (tungsten, molybdenum) has on density, microstructure properties, and mechanical properties (microhardness, fracture toughness) of ceramics was studied. SPS activation energies were determined and it was demonstrated that the intensity of shrinkage of the fine-grained YAG:Nd – (W,Mo) ceramic-metal composites close to the activation energy of creep in tungsten (molybdenum). It has been demonstrated that the intensity of creep during SPS of fine-grained composites at medium temperatures is determined by the intensity of volume oxygen diffusion in the lattice of garnet nanoparticles, whereas at high temperatures it is determined by grain-boundary diffusion.

石榴石型复合氧化物粉末Y _2.5 Nd _0.5 Al ₅ O ₁₂（YAG：Nd）– x体积％W，Mo（x = 0、10、20）是使用湿化学技术从盐溶液中沉淀出金属相而获得的。合成后，YAG：Nd石榴石的纳米颗粒聚集成亚微米团聚体。火花等离子体烧结（SPS）用于获得相对密度约为99％的细晶粒陶瓷-金属复合材料YAG：Nd –（W，Mo）。研究了金属浓度（钨，钼）对陶瓷的密度，显微组织性能和机械性能（显微硬度，断裂韧性）的影响。测定了SPS的活化能，结果表明，细粒YAG：Nd –（W，Mo）陶瓷-金属复合材料的收缩强度接近钨（钼）蠕变的活化能。