Low temperature synthesis of alpha alumina platelets and acicular mullite in MgO-Al2O3-SiO2 system
The refractory materials are more reliable and less expensive, this research is based on materials like alumina and mullite because it offers a very high refractoriness. In the present study an acicular mullite and a-alumina platelets were synthesized by using a synthesis of chemicals related to r...
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| Další autoři: | , |
| Médium: | Artículo |
| Jazyk: | en_US |
| Vydáno: |
2019
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| Témata: | |
| On-line přístup: | https://doi.org/10.4416/JCST2018-00043 https://www.ceramic-science.com/articles/all-articles.html?article_id=100694 |
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| Shrnutí: | The refractory materials are more reliable and less expensive, this research is based on materials like alumina and
mullite because it offers a very high refractoriness. In the present study an acicular mullite and a-alumina platelets
were synthesized by using a synthesis of chemicals related to raw materials SiO2 45 wt%-Al2O3 45 wt% – MgO
10 wt%. The a-alumina platelets and acicular mullite were obtained in a reduced processing time and temperature,
compare to conventional methods, such as sol-gel method, microwave sintering, chemical synthesis, combustion
synthesis and lip casting and sintered. The composition, thermal analysis and micro structure evolution were followed
by X-ray diffraction, differential thermal analysis and scanning electron microscopy (SEM). The synthesis of chemicals
method based on Pechini process was successfully to synthesize a-alumina platelets and acicular mullite. All the
precursor powders used have an amorphous structure with submicron particle size. The effect of MgO in the formation
of a-alumina platelets and acicular mullite at low temperature was found. Thea-alumina platelets and acicular mullite
was detected after heating at 800 °C and the dissolution a-alumina platelets for the formation of secondary mullite is
around 1000 °C. It was observed that at 1400 °C it’s crystallized type III of secondary mullite. The behavior of the
evolution of the phases and compact solid samples from oxides was made. |
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