PREPARATION AND PORE STRUCTURE OF NI-CR-MO-CU POROUS MATERIALS WITH SECOND ORDER GRADIENT PORE SIZE

The activation reaction sintering method was utilized to produce a Ni-Cr-Mo-Cu porous matrix using Ni, Cr, Mo, and Cu powders as raw materials. The vacuum sintering process was then used to create a Ni-Cr-Mo-Cu porous material with larger particle sizes painted on the surface of the matrix. The resulting material with first order gradient pore size was used as the matrix, which was then painted with fine particle size Ni, Cr, Mo, and Cu to obtain second order gradient pore size porous material. The phase, morphology, element distribution, and pore structure parameters of these materials were analyzed, and it was found that they have a uniform element distribution and a complete pore structure. The first order porous material had a maximum pore size of 10.4 μm and a permeability of 83.7 m3·m-2·h-1·KPa-1, while the second border porous material had a maximum pore size of 7.2 μm and a permeability of 78.9 m3·m-2·h-1·KPa-1. Compared to the first order gradient pore size, the second order gradient pore size of the porous material decreased by 30.7%, but the permeability remained basically unchanged, indicating that the permeability of the second order gradient pore size porous material had significantly improved. In summary, using the activation reaction sintering method, a Ni-Cr-Mo-Cu porous material was fabricated, which was later used to construct a gradient pore size porous material with improved permeability. The resulting material had a uniform element distribution and a complete pore structure, making it highly promising for potential applications in filtration, catalysis, and sensing fields.