Effects of sintering temperature and particle size on permeability of functionally gradient composite porous materials prepared by hanging slurry process

Abstract

Porous materials have excellent functions in filtration and purification, and gradient composite porous materials enrich the product types of porous materials in the same field. In the preparation of metal-ceramic gradient composite porous materials, the matching relationship between the pore morphology and pore size of the metal porous matrix and the coated powder particles will seriously affect the structure and performance of the ceramic membrane. This work mentions the different size range (60, 100, 200 and 400 mesh) of 316 L stainless steel powder particles as the raw materials which are at different sintering temperatures of 1170, 1200 and 1230 °C, the fabrication of porous 316 L stainless steel substrate which was made by hanging slurry preparation of precursor, at the same time using Ar protection at different sintering temperatures (650, 700, 750 and 800 °C) to the preparation of metal-ceramic composite gradient according to different matrix apertures of porous materials. The pore structure, microstructure and morphology characteristics of different samples both of matrix and functionally gradient composite were analyzed and characterized. On the basis of test of permeability of functionally gradient composite porous materials, this kind of composite gradient porous material can be excellent at part of permeability which matrix was made by 400 mesh 316 L stainless steel powder particles at sintering temperature of 1230 °C and then dealed with the process of hanging slurry to became the precursor which ceramic membrane was prepared at sintering temperature of 650 °C. Maximum aperture of the porous substrate filtration precision under the combination of ceramic membrane layer can be increased by 96.3%. By observing the change of pore morphology of porous matrix, this paper aims to make a research of influence of sintering temperature and powder particles size on permeability of the functionally gradient composite porous materials, and also provide a reference for improving the filtration accuracy of existing porous materials.

Flat sheet metakaolin ceramic membrane for water desalination via direct contact membrane distillation

“…The powder particle size and the distribution affected the viscosity of the ceramic suspension, the movement of the particles in ceramic suspension during phase inversion, and the particle migration and bindings during sintering at high temperatures (Konijn et al 2014;Renteria et al 2019;Li et al 2020a). Moreover, powder particle size and the distribution of the starting material (raw material) affected the morphology characteristic and the porosity of the fabricated ceramic membrane (Hubadillah et al 2016a(Hubadillah et al , 2021Ji et al 2020).…”

Preparation and Pore Structure of Ni-Cr-Mo-Cu First Order Gradient Porous Materials

“…At present, the filtration of porous metal materials in harsh environments has received much attention, but there are still some problems such as low filtration accuracy and small permeability. Studies have shown that gradient porous materials can effectively improve filtration accuracy on the basis of maintaining a good permeability (Ji et al, 2020). Therefore, the research and application of gradient porous materials are now the focus of research.…”

The Pore Microstructure Evolution and Porous Properties of Large Capillary Pressure Wicks Sintered with Carbonyl Nickel Powder

“…With increasing sintering temperature, the permeability of porous materials usually decreases, and pore size rarely changes or slightly decreases [ 21 , 22 ]. However, early studies have shown that the permeability and pore size of porous materials both increase with sintering temperature [ 23 , 24 , 25 , 26 , 27 ]. Some of these results are attributed to the liquid phase during sintering [ 25 , 26 , 27 ].…”