Showing papers by "Hany Hassanin published in 2010"
TL;DR: In this article, a multilayer FGM has been achieved using highly stable Al"2O"3/Y-ZrO"2 suspensions with different compositions, which demonstrates a way to produce ceramic microcomponents with different materials at each side of a layer for tunable properties.
27 citations
TL;DR: In this paper, a soft molding process for manufacture of ceramic microcomponents, alumina and Al2O3/SiC composite, is introduced, which involves fabrication of SU-8 master moulds and production of mirrored polydimethysiloxane (PDMS) soft moulds.
Abstract: A soft moulding process for manufacture of ceramic microcomponents, alumina and Al2O3/SiC composite, is introduced in this paper. The process involves fabrication of SU-8 master moulds and production of mirrored polydimethysiloxane (PDMS) soft moulds. Green parts are formed in the PDMS moulds by filling the ceramic slurry into the soft moulds and net-shape green components are obtained after demoulding. The methods for the mould filling using different suspensions were demonstrated: one was aqueous suspension for alumina microcomponent and another was non-aqueous suspension for Al2O3/SiC microcomponent. The measurements showed that the proposed soft lithography process is successful in producing ceramic microcomponents and retaining the fine features in micron scale.
25 citations
TL;DR: In this article, a process and its parameters are proposed for fabrication of zirconia micro parts, where UV lithography of SU-8 and replication of polydimethylsiloxane (PDMS) are used for the fabrication of the moulds.
24 citations
08 Apr 2010
TL;DR: In this article, a three-dimensional micro ceramic functionally graded material (FGM) has been fabricated by an infiltration process, which involves soft lithography, colloidal powder processing and the infiltration of yttria stabilized zirconia with a pre-ceramic polymer solution.
Abstract: A three-dimensional micro ceramic functionally graded material (FGM) has been fabricated by an infiltration process. The proposed technique offers an effective way to tailor the composition and microstructure of ceramic micro components. The process involves soft lithography, colloidal powder processing and the infiltration of yttria stabilized zirconia with a pre-ceramic polymer solution. Analyses by SEM, BSE and EDS have revealed the existence of concentration gradients, the Si and C content decreasing with increasing of the sample depth. The resultant micro part has a homogeneous core encased with a graded and layer of YSZ / SiC.
13 citations