Consolidation of single and double layers ceramic structure
Basically, the performance of ceramic structure is essential for the development of ceramic system or component. This performance can be controlled from the early stage i.e preparation of raw material up till the final stage i.e. finishing steps. In this work, ceramic processing parameters at interm...
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| Format: | Thesis |
| Published: |
2012
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/3711/ http://eprints.uthm.edu.my/3711/1/NUR_FARHANI_BINTI_ISMAIL.pdf |
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| Summary: | Basically, the performance of ceramic structure is essential for the development of
ceramic system or component. This performance can be controlled from the early
stage i.e preparation of raw material up till the final stage i.e. finishing steps. In this
work, ceramic processing parameters at intermediate stage (consolidation) were
considered to obtain good properties and structure of alumina ceramic. The
microstructure, mechanical and physical properties of the green and sintered alumina
ceramic pellets (single and double layer) were investigated. Some modification
during consolidation (drying and firing) which focuses on the particle characteristics,
drying techniques, additive and types of sintering were conducted. Three drying
techniques (room, oven and microwave) were performed to the single and double
ceramic alumina. Several factors which are identified as strong influence towards the
sintered body i.e. characteristics (particle size and particle size distribution), MgO
additive and sintering types (conventional and HIP technique) were selected as
controlled parameters during the sintering step. All samples were fabricated using
uniaxial press prior to the consolidation stage and were characterized using standard
procedures. Based on the observation and measurement, it was found that the
microwave drying technique produced a homogenous and uniform microstructure
compared to the other drying techniques for both green and sintered bodies. The
density value of 25 μm sintered body (Al2O3) with microwave drying technique
shows an increment value from 3.551 g/cm3 to 3.624 g/cm3 compared to others
drying technique. The same phenomena were also observed with the addition of
MgO. In fact, the highest density value was obviously shown with alumina pellets
sintered under HIP with same drying technique. In general, the increased of density
value causes a reduction of porosity thus produce a good and hard sintered structure
for all sintered samples. |
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