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Low‐temperature synthesis of α‐Al 2 O 3 powder aided by ball milling and a trace amount of sodium chloride
It is crucial to synthesize α‐Al 2 O 3 , which is a multifunctional material, at high temperatures due to the nature of the material. However, this high‐temperature preparation process is not energy efficient, which goes against the global aim of carbon neutrality. In this study, we explored the eff...
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| Published in: | International journal of applied ceramic technology 2023-11, Vol.20 (6), p.3436-3445 |
|---|---|
| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | It is crucial to synthesize α‐Al
2
O
3
, which is a multifunctional material, at high temperatures due to the nature of the material. However, this high‐temperature preparation process is not energy efficient, which goes against the global aim of carbon neutrality. In this study, we explored the effect of adding 1 wt.% (NaCl) as an additive and a suitable amount of Al(OH)
3
in a ball mill to form a precursor. The impact of NaCl and ball milling duration on the phase transition from Al(OH)
3
to α‐Al
2
O
3
at low temperatures was investigated. After the conversion from Al(OH)
3
to γ‐Al
2
O
3
, the NaCl particles on the surface of γ‐Al
2
O
3
act as diffusion channels, helping to accelerate the substance diffusion during the transition from γ‐Al
2
O
3
to α‐Al
2
O
3
, resulting in a lower formation temperature of α‐Al
2
O
3
, which is 700°C. Additionally, the presence of NaCl results in α‐Al
2
O
3
particles growing into hexagonal plates. The α‐Al
2
O
3
plates produced from calcining the mixture of Al(OH)
3
and NaCl at 700°C have an average diameter of 3 µm, an average diameter/thickness ratio of 10 and a specific surface area of 12.0085 m
2
/g. These results indicate that low‐temperature synthesis of α‐Al
2
O
3
powder is possible by using NaCl as an additive instead of molten salt in the ball milling process.
Low‐temperature (700°C) synthesis of plate α‐Al
2
O
3
was achieved through the combination of ball milling process and sodium chloride (NaCl) additive. Ball milling effectively reduced the particle size of Al(OH)
3
and NaCl, facilitating their thorough contact. The NaCl particles acted as diffusion channels, promoting faster material diffusion and lowering the transition temperature from γ‐Al
2
O
3
to α‐Al
2
O
3
. |
|---|---|
| ISSN: | 1546-542X 1744-7402 |
| DOI: | 10.1111/ijac.14460 |