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Alumina
High-purity alumina is used as LED substrate material production
Xie, Yadian. Diss. Université du Québec à Chicoutimi, 2017.
Currently, sapphire crystal, the most commonly used LED substrate material, has developed rapidly in recent years due to its excellent optical, chemical and other properties. In the global LED substrate market, 2-inch sapphire crystals are widely used. Nano-alumina particles of purity (5N). Sapphire crystals are produced using a specific intermediate alumina. The average length of the crystal rods produced is calculated using the total length of the crystal rods obtained from each crystal. This is used to determine the effect of different intermediate alumina morphologies on sapphire growth.
Spherical alumina nanoparticles were prepared by a single template method. Different reaction temperatures and contact times were used and calcined to 1800°C. The results showed that after calcination at 1800°C, the diffraction peaks were sharp and regular. This indicates that α-alumina has a single crystal phase, the crystal growth is highly ordered, and the crystallinity is good. All samples were converted to α-alumina. The α-alumina obtained after calcination at 1800°C was used as a raw material in the sapphire growth process using heat exchange. (By a single template method, different reaction temperatures and contact times were used by heating at 600°C). The Al 2 O 3 particles have the same purity but different morphologies. After calcination at 1800°C, the calcined alumina (1800°C) was used as the raw material for growing sapphire using the heat exchange method. Length of sapphire crystal rod.
Study on the application of alumina in refractories
Liao, Guihua, et al. J. Miner. Mater. Charact. Eng 3.2 (2004): 81-89.
The effects of several aluminas on the physical properties of high-purity andalusite-based refractories were studied, and the effects of the types and addition amounts of alumina on the phase composition and microstructure of the refractories were studied by X-ray diffraction and scanning electron microscopy. The results show that the sintering properties of the refractory samples without alumina addition are better than those of the refractory samples with alumina addition, while the effects of the selected samples with alumina addition on the sintering properties of high-purity andalusite-based refractories are related to the purity and activity of the added alumina samples. The SiO2 glass phase derived from the decomposed andalusite aggregate cannot completely react with the added alumina to form secondary mullite. Moreover, when the addition amount of alumina reaches about 15% (mass percentage), more extensive secondary mullitization and greater expansion are observed in the experimental samples.
First, equal amounts of sintered alumina, fused brown corundum, bauxite-based corundum and activated alumina were added to the sample matrix, respectively, to investigate the effects of different alumina samples on the physical properties of HPABR. Secondly, the selected alumina samples were fixed, and the effect of adding fixed alumina on the physical properties of HPABR was further studied. All samples were formed by an oil press at a pressure of 200 MPa. After drying for about 24 hours, the green body was fired in an electric furnace at 1500°C and kept for 3 hours of soaking time. After the fired samples were cooled, their bulk density, porosity, crushing strength, firing expansion and re-firing expansion were tested. The creepage performance of some samples was also tested, and the microstructure of the selected samples was observed by SEM. In addition, the phase composition test was also carried out on some samples. When the diffractometer tested the samples, the working voltage was 35KV and the working current was 40mA.
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