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Chemistry of alumina, reactions in aqueous solution and its application . . . Most solid phases in natural water contain aluminium oxides Alumina plays an important role in regulating the composition of soil–water, sediment–water, and other natural water systems [11] Active alumina, due to its high surface area, mechanical strength and thermal stability has found several applications as an adsorbent and catalyst
Alumina - an overview | ScienceDirect Topics Alumina is a valuable raw material used in the production of various products such as adsorbents, abrasives, polishing agents, refractory materials, and aluminum It is obtained from bauxites through the Bayer process and requires the removal of certain organic compounds to enhance its production From: Journal of Hazardous Materials, 2020
High-temperature mechanical properties and thermal . . . - ScienceDirect An alumina-fiber-reinforced alumina ceramic matrix (Al 2 O 3 Al 2 O 3) composite is fabricated by a slurry infiltration process in this study The slurry contains Al 2 O 3 powders with broad particle size distribution (d 10 = 0 35 μm, d 50 = 0 57 μm, d 90 = 1 90 μm)
Preparation of high-purity alumina ceramics with high-performance by . . . When the alumina purity reaches 99 99 wt%, the consistency of the powder allows for direct pressing and sintering into smooth-surfaced high-purity alumina blocks The 99 99 wt% alumina ceramic achieved a density of 3 94 g·cm −3, a bending strength of 529 09 MPa, and
Recent processes for the production of alumina nano-particles Stanislaus et al [36] prepared alumina nano-particles via hydrothermal method and investigate the pore widening of alumina phase during the process in the presence and absence of additives such as P, F, phenol and acetic acid The results reveal that the pores could be widened selectively with greater than 70% of the total pore volume in the
Synergistic strengthening mechanism of zirconia-reinforced alumina . . . Alumina-based ceramics, a crucial structural material, are extensively exploited in cutting tools and biomedical (dental) applications due to their high strength, thermal resistance, and chemical stability [[20], [21], [22]] Various traditional fabrication routes have been developed to manufacture Al 2 O 3-based composites with limited geometries
Soft alumina-based thermal interface materials with enhanced thermal . . . As a result, relying on the synergistic effect of h-BN and LM with alumina, the TIM using the well-designed hybrid fillers (50 wt% Al 2 O 3, 20 wt% h-BN, 10 wt% LM) exhibits a high thermal conductivity of 7 2 ± 0 30 W m −1 K −1, marking significant improvements of 133 % and 35 % compared to the samples based on pure Al 2 O 3 and h-BN Al 2
On the structure of γ-Al2O3 - ScienceDirect In catalysis, gamma alumina (γ-Al 2 O 3) is the most widely used support, because it has a high mechanical strength, can be prepared with high surface area, and is quite inexpensive to produce In addition, alumina is used as a catalyst itself, because its surface contains acidic and basic groups
Research progress of ultrafine alumina fiber prepared by sol-gel method . . . Crystalline alumina generally has nine crystal forms (α, β, γ, δ, η, θ, κ, ρ, χ), and the γ and α alumina fiber are widely used at present The γ-alumina fiber has the characteristics of porous, large specific surface area and strong adsorption performance, which can be used in the removal of pollutants or industrial catalyst carriers