In the present research, NiO–SDC (Samarium doped Ceria) nanopowder was synthesized through sol–gel combustion method using citric acid as a reducing agent (fuel) and metal nitrates as an oxidant. The characteristics of the synthesized powder were thoroughly analyzed by DTA/TG, XRD, BET and FESEM/EDX. Tubular gel-casted porous specimens of NiO–SDC (50:50 wt%) composite materials were produced after stabilizing suspensions of composite powder in an aqueous environment by addition of 3 wt% dispersant and 2.5 wt% agar as the gel builder. The effect of Dolapix CE64 as a dispersant, agar as a gel-builder and the amount of solid loadings on the processing and properties of porous ceramics was investigated. Viscosity measurements, zeta potentials of suspensions with and without dispersant and sedimentation measurement were used to determine the optimum dispersant concentration and solid concentration needed to prepare a stable slurry. The phase composition and microstructure of sintered samples were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Moreover, the distribution and porosity of the samples were determined through mercury porosimetry method. Results confirmed that stable NiO–SDC slurries with high solid loading (60 %) were achieved with Dolapix CE64, which also met the requirements to reach porous tubular samples with up to 60% porosity.

在本研究中，使用柠檬酸作为还原剂（燃料）和金属硝酸盐作为氧化剂，通过溶胶-凝胶燃烧法合成了NiO-SDC（Sa掺杂的二氧化铈）纳米粉。通过DTA / TG，XRD，BET和FESEM / EDX对合成粉末的特性进行了全面分析。通过在水性环境中添加3 wt％的分散剂和2.5 wt％的琼脂作为凝胶助洗剂，稳定复合粉末在水环境中的悬浮液，制成NiO-SDC（50:50 wt％）复合材料的管状凝胶浇铸多孔样品。研究了Dolapix CE64作为分散剂，琼脂作为凝胶助洗剂以及固体载量对多孔陶瓷的加工和性能的影响。粘度测量 使用具有和不具有分散剂的悬浮液的ζ电势以及沉降测量来确定制备稳定浆液所需的最佳分散剂浓度和固体浓度。通过X射线衍射（XRD）和扫描电子显微镜（SEM）研究了烧结样品的相组成和微观结构。此外，通过水银孔率法测定样品的分布和孔隙率。结果证实，使用Dolapix CE64可实现高固含量（60％）的稳定NiO-SDC浆料，该浆料还满足了孔隙率高达60％的多孔管状样品的要求。通过X射线衍射（XRD）和扫描电子显微镜（SEM）研究了烧结样品的相组成和微观结构。此外，通过水银孔率法测定样品的分布和孔隙率。结果证实，使用Dolapix CE64可实现高固含量（60％）的稳定NiO-SDC浆料，该浆料还满足了孔隙率高达60％的多孔管状样品的要求。通过X射线衍射（XRD）和扫描电子显微镜（SEM）研究了烧结样品的相组成和微观结构。此外，通过水银孔率法测定样品的分布和孔隙率。结果证实，使用Dolapix CE64可实现高固含量（60％）的稳定NiO-SDC浆料，该浆料还满足了孔隙率高达60％的多孔管状样品的要求。