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Alumina (Al2O3) is used widely in ceramic industry because some of its properties are superior than metal and polymers. In the processing of alumina, the shrinkage behaviour is one of important factor of the fired product in terms of accuracy of the product made. On the other side, shrinkage can be...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/14822 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Alumina (Al2O3) is used widely in ceramic industry because some of its properties are superior than metal and polymers. In the processing of alumina, the shrinkage behaviour is one of important factor of the fired product in terms of accuracy of the product made. On the other side, shrinkage can be used as an indicator towards the densification of a product. Addition of additive is often done in the processing of Al2O3 ceramics with a specific purpose. Addition of TiO2 additives were reported to increase the firing shrinkage of products in the same temperatures, while the addition of MgO additive were reported to inhibit the creation of discontinuous grain growth so that the density of the product obtained close to the theoretical density. The addition of additives can also affect the hardness and fracture toughness of alumina products. <br />
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In this research, alumina ceramics made by the addition of 1w/o TiO2 and 1w/o MgO using dry pressing method. The firing process carried out 1550oC and 1750oC. Specimen characterizations were done by shrinkage measurement, hardness testing, calculation of K1C values and fractography observation. <br />
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The addition of TiO2 in this research give a higher shrinkage of Al2O3 up to 13,1% at a temperature of 155oC, while the addition of MgO does not have a significant effect. The hardness measured for Al2O3 without additives and with addition of 1w/o MgO (sintering temperature 1750oC) are 753 VHN and 1058 VHN, whereas the hardness value of Al2O3 with the addition of 1w/o TiO2 (sintering temperature 1550oC) is 957 VHN. The addition of MgO decrease the K1C value of Al2O3 up to 4,7% (4,7 MPa.m1/2) while the value K1C of alumina ceramics with the addition of 1w/o TiO2 (sintering temperature 1550oC) is 3,8 MPa.m1/2. |
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