Abstract
In the current study, Al2O3–TiN composites were successfully fabricated with various particle sizes (10, 20, 30, and 50 μm) and concentrations (5, 10, 15, and 20 vol %) via a novel ball milling + Ti reactive sintering process. By applying the reactive sintering, Ti powders will transform into TiN particles, which act as mechanical reinforcements and electrical conductors in the Al2O3 matrix. The ball milling process alters the Ti powder morphology from a low-aspect-ratio sphere into a high-aspect-ratio disc, which reduces the electrical percolation threshold value from 29% to 15% in the current setup. However, such a threshold value is insensitive to the particle size. Meanwhile, the Ti particle size has a significant influence on the material’s mechanical properties. A small particle size results in less porosity and hence higher flexural strength of the composite.
Highlights
Alumina is known as one of the most widely used engineering ceramic materials in the world as a result of its high temperature, its corrosion and wear resistance, and its low cost
The application of an electric field on conductive ceramic membranes has been reported as an effective method to alleviate the fouling issue by improving filtration pressure and increasing the filtration flux, increasing the filtration efficiency [3]
The development of electrical conductive alumina composites is beneficial to the ceramic membrane industry
Summary
Alumina is known as one of the most widely used engineering ceramic materials in the world as a result of its high temperature, its corrosion and wear resistance, and its low cost. The application of the alumina membrane for water filtration is booming because of its good chemical resistance with high permeability, compared to the traditional polymer membranes. One major issue of ceramic membrane technology is fouling, which reduces the component’s lifespan and increases the cost [1,2]. The application of an electric field on conductive ceramic membranes has been reported as an effective method to alleviate the fouling issue by improving filtration pressure and increasing the filtration flux, increasing the filtration efficiency [3]. The development of electrical conductive alumina composites is beneficial to the ceramic membrane industry
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