Publication: Kajian kesan saiz partikel alumina dan tempoh pengadukan ke atas sifat-sifat fizikal krusibel alumina yang dihasilkan menggunakan kaedah tuangan gel
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Date
2004-03-01
Authors
Mohamed Khalib, Rosfariza
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Abstract
Gel casting is a new forming method that not used widely. Gel casting is a process, which involved mixing organic monomer solution with ceramic powder slurry
and then poured into the mold. In this process, monomer solution is polymerized by in situ process to form solid gel that bonds the ceramic powder particles. In this experiment, Particle size and mixing time will effect properties of alumina crucible. Alumina (Al2O3) crucible have been gel cast using five kinds of alumina with different particle size and two from that kinds of alumina have been gel cast using different mixing time. Five different alumina powder with various size has been study including Alumina Metco 105SFP, Alumina 001306, Alumina Metkon with size 0.05 μm, 0.3 μm and 1.0 μm. Each batch of slurry has been prepared for each particle sizes depend on the percentages of solid loading. After sintering process, some characterization testing is done such as linear shrinkage, density, permeablelity and microstructure studied. From the study, we can make a conclusion that alumina powder alumina Metco 105SFP can give the optimum result compare to other sizes. The optimum percentage of solid loading for this powder is 50%. Gel casting method also can produce the though complex shape body without collapse. The effect of particle size and mixing time on gel casting process and properties of alumina crucible have been investigated, including process parameters affecting homogeneous green microstructure. The cast able solid loading of each starting materials, Alumina Metco 105SFP-50, 001306-30, Metkon 1.0 μm-38, Metkon 0.3 μm-39 and Metkon 0.05 μm-15 vol.%, respectively. The contents of monomer added in slurry were
20 wt%, respectively and dimmer (cross-linker) of 2 wt% was added in all slurry. The effect of starting materials, especially particle size, has been analyzed through microstructural analysis and green density. And for mixing time has been analysis through microstructural analysis. Microstructural analysis revealed that the size and distribution of pores in the green body was radically reduced with decreasing particle size. The optimum mixing time based on the microstructural analysis was 8 hour.