Effect of Cu Metal of Nanoscale Particle Size on the Porosity and Mechanical Properties of Porous Alumina Ceramics using Yeast as a Pore Agent

Mohammed Sabah Ali,Khamirul Amin Matori,M Norkhairunnisa,M.A Azmah Hanim,C.N.A Jaafar,S.M Tahir

doi:10.19026/rjaset.14.4288

Mohammed Sabah Ali, Khamirul Amin Matori + Show 4 more

Open Access

https://doi.org/10.19026/rjaset.14.4288

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Abstract

The main goal of this study is to determine the effect of the addition of Cu metal of nanoscale particle on the mechanical properties and porosity of porous alumina ceramics. Porous alumina reinforced ceramics were prepared using nanoscale Cu metal particles as their strengthening phase. Solid state and sacrificial techniques were used to prepare the porous alumina reinforced ceramics. A FESEM was used to analyse the microstructure. Different ratios of Cu metal were added (3 wt%, 6 wt%, 9 wt% and 12 wt% Cu) at different ratios of yeast used as a pore agent. The results indicated that with increasing the ratios of Cu metal, the porosity decreased and the mechanical properties increased. The increase in the mechanical properties could be attributed to the decrease in the porosity and the toughening mechanism of porous alumina ceramics. Some potential applications include, filtration, thermal and purging of gas.

Highlights

The unique properties of tailored porous ceramics, such as their excellent strain and damage tolerance, good thermal shock resistance, wear resistance, high corrosion and light weight render them as potential components (Jean et al, 2014; Zhang et al, 2012) of filtering materials for separation membranes, light weight structural materials (Tang et al, 2004), catalyst supports, thermal insulation, bioreactors, gas filters for high temperature, (Dessai et al, 2013; Yu et al, 2011) medical ultrasonic imaging and underwater sonar detectors
Commercial sucrose was used as a binder (10% -12%) in the ceramic mixture based on the maximum solubility of sugar in water; 60 wt.% concentration solution was the concentration used in this study (Mohanta et al, 2014)
It was reported that the dispersion of nanoscale metallic particles (< 100 nm) (Ni, Cu, W, Co, Ti and Mo) in ceramics such as ZrO2 and Al2O3 notably improves the mechanical properties of the ceramic body (Liu et al, 2013)

Summary

Introduction

The unique properties of tailored porous ceramics, such as their excellent strain and damage tolerance, good thermal shock resistance, wear resistance, high corrosion and light weight render them as potential components (Jean et al, 2014; Zhang et al, 2012) of filtering materials for separation membranes, light weight structural materials (Tang et al, 2004), catalyst supports, thermal insulation, bioreactors, gas filters for high temperature, (Dessai et al, 2013; Yu et al, 2011) medical ultrasonic imaging and underwater sonar detectors. Increasing the porosity of porous ceramics decreases their mechanical properties, most applications of porous ceramics require good-to-excellent mechanical properties (Zhang and Malzbender, 2015). The mechanical properties of the filter must be high enough to bear operational pressure and its properties must not be affected by the increasing temperatures (Hammel et al, 2014). The porous ceramic membrane that will be used needs to possess high fracture toughness and bending strength. The addition of a ductile metallic phase is an effective way of overcoming the drawbacks of ceramic materials, which results in improved bending strength, fracture toughness and tensile strength. In works on porous ceramics, many researchers have utilised micro metal particles to enhance the mechanical properties of the porous ceramic

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