Publication: Kajian penghasilan teras seramik berliang dan system perekat dalam struktur sandwic
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Date
2005-03-01
Authors
Rahmat, Mohd Hafiz
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Abstract
Porous ceramic has a great potential to advance in the field of medical, water and air filter and refractory. However, the low strength property often limited the usage of porous ceramic in certain application. The combination of porous ceramic with the metal layer bonded with adhesive to form a sandwich structure can be used as light building materials. This research involved three phases that is the production of porous ceramic, identification ratio of epoxy to hardener and determination of the correct amount of adhesive usage. In the first phase, porous ceramic was produce by using the polymer sponge technique. Ceramic slurry was prepared by mixing the porcelain powder with distilled water at 40 to 50 % solid loading content. The sponge was dipped into the ceramic slurry and the excess slurry was removed. The dipped sponge was dried for one day at 100 oC before sent to sintering at 1250 oC. Porous ceramic produced was based on Archimedes and strength test. The second phase involved mixing epoxy with hardener at 45 to 55 % weight ratio to produce adhesive, visual inspection and viscosity determination by drop test. The third phase was to apply the adhesive to porous ceramic with 4 to 12 g amount. The tear, shear stress and Modulus of Rupture (MOR) test were conduct to observe the adhesive bonding. Result obtained from the first phase indicated the 45 % of solid loading was the suitable composition to produce porous ceramic. Porous ceramic inhibit 58 to 81 % of apparent porosity with bulk density range from 0.5 to 0.8 g/cm3. Compression strength was recorded between 1.01 to 2.01 MPa. The bulk density and compression strength of porous ceramic produced proportional to the solid loading contents. The drop test in second phase indicated the drop rate increased with the amount of epoxy. From the observation, the ratio of 50 % epoxy gave the better drop rate. The third phase, the tear test showed 8 g adhesive gave the excellent property. The value of stress strength was obtained in the range from 0.01 to 0.04 MPa, while strain strength was recorded in range 2.4 to 8.4. The result of three bend test showed that the yield stress in range of 0.025 to 0.038 MPa. As the overall, 45 % solid loading with excellent property can be applied for porous ceramic core. The ratio of 50 % epoxy were the best mixing adhesive and the use 8 g adhesive where suitable for stick sandwich structure with excellent strength.