Aluminum Oxides
Mostrando 13-24 de 48 artigos, teses e dissertações.
-
13. Pechini Synthesis of Nanostructured Li1.05M0.02Mn1.98O4 (M = Al3+ or Ga3+)
Doped Li1.05M0.02Mn1.98O4 (M = Ga3+ or Al3+) were prepared by Pechini synthesis using lithium and manganese acetates, citric acid, ethylene glycol, and the respective oxide or acetate of the doping ions in molar ratios of 2.00 (Mn1.98 + M0.02) to 1.05 Li. The TGA/DTA of the precursor gels showed weight loss/energy relative to crystallization below 450 ºC. F
Mat. Res.. Publicado em: 17/11/2015
-
14. Feasibility of RF Sputtering and PIIID for production of thin films from red mud
During the extraction of aluminum from bauxite, a waste of oxides containing traces of heavy metals in a highly alkaline matrix, called Red Mud (RM), is produced. In this study RM is characterized and the feasibility of using it as a precursor for the production of thin films by Plasma Sputtering and by Plasma Immersion Ion Implantation and Deposition (PIIID
Mat. Res.. Publicado em: 26/10/2014
-
15. Clay mineralogy and magnetic susceptibility of Oxisols in geomorphic surfaces
Studies analyzing the variability of clay minerals and magnetic susceptibility provide data for the delineation of site-specific management areas since many of their attributes are important to agronomy and the environment. This study aimed to evaluate the spatial variability of clay minerals, magnetic susceptibility, adsorbed phosphorus and physical attribu
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-06
-
16. Effects of acid treatment on the clay palygorskite: XRD, surface area, morphological and chemical composition
The palygorskite is an aluminum-magnesium silicate that has a fibrous morphology. Their physico-chemical characteristics are the result of high surface area, porosity and thermal resistance which make it an attractive adsorbent. Its adsorption capacity can be increased through chemical reactions and/or heat treatments. The objective of this work is to verify
Mat. Res.. Publicado em: 09/05/2014
-
17. Resposta da cultura do milho aos fertilizantes fosfatados e nitrogenados revestidos com polímeros / Response of maize to polymer-covered phosphate and nitrogen fertilizers
The effective use of fertilizers, besides resulting in greater yield, can reduce production costs, with positive results in the end of the cropping season. Soil correction and fertilization in intensive maize production systems represent, on average, 40% to 45% of the production cost. Phosphorus is considered as a nutrient with low absorption by plants due t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/01/2012
-
18. âInfluÃncia da adiÃÃo de cargas inorgÃnicas no desempenho de produtos refratÃrios obtidos a partir de borras de alumÃnioâ / âInfluence of addition of inorganic fillers on the performance of refractory products made from aluminum sludgeâ
ABSTRACT White dross is a reject generated during aluminium production. It contains several oxides that can be useful to the refractories and cement industries. However, white dross can be hazardous both to human health and the environment. In this work, white dross was evaluated as a prospective raw material for the production of refractories. For this purp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/11/2010
-
19. Thermodynamic study of non-metallic inclusion formation in SAE 1141 steel
The main purpose of this paper is the thermodynamic study of non-metallic inclusion formation in the CC tundish for SAE 1141 steel. The specific purposes are: 1) obtaining inclusions as function of steel composition and casting temperature. 2) establishing steel chemical composition to form less harmful inclusions to the SAE 1141 steel castability. Simulatio
Matéria (Rio de Janeiro). Publicado em: 2010
-
20. Oxygen potencial effects on the oxidation sublayer and its influence on the magnetic properties of eletric steels after the final annealing heat treatment. / O efeito do potencial de oxigênio na oxidação subsuperficial e suas influências nas propriedades magnéticas de aços elétricos após o recozimento final.
Semi processed electrical steels, used for the manufacture of rotor and stator laminations are acquired from Steel Markers and after being punched in its final shape, must undergo an annealing heat treatment, which aims to improve the magnetic properties of the steel. If this heat treatment is carried out under inappropriate conditions, the dissolved element
Publicado em: 2010
-
21. Influence of additive system (Al2O3-RE2O3 , RE = Y, La, Nd, Dy, Yb) on microstructure and mechanical properties of silicon nitride-based ceramics
Silicon nitride based ceramics have been widely used as structural ceramics, due mainly to their thermo-mechanical properties such as high density, high thermal shock resistance, corrosion resistance and chemical stability. The aim of this study was to determine the influence of rare earth and aluminum oxide additions as sintering aids on densification, micr
Materials Research. Publicado em: 2009-06
-
22. Nanocomposites materials generated from a spray
The Spray Pyrolysis (SP) process has been employed at moderate temperature (470-970 K) for the synthesis of micro- and nano-particles of hydrated metal oxides and of related nanocomposites. It has been applied to iron nitrate solutions, without or with the addition of sodium chloride as a flux. After removal of the flux, nanocomposites of ferrihydrite (5Fe2O
Brazilian Journal of Physics. Publicado em: 2009-04
-
23. SÃntese de esferas hÃbridas e seu desempenho na reaÃÃo de desidrogenaÃÃo do etilbenzeno na presenÃa de diÃxido de carbono / Synthesis of hybrid spheres and their performance in the dehydrogenation reaction of ethylbenzene in carbon dioxide presence
The various possibilities of application of the mesoporous materials, such as catalysis and adsorption, it have encouraged the research in the synthesis of these materials. In addition, but less frequent, synthetic routes have been searched in order to obtain a material whose structure and grain size allow its application in industrial reactors, without the
Publicado em: 2009
-
24. Melhoria da Lingotabilidade do Aço Inoxidável Ferrítico AISI 409 na ArcelorMittal Inox Brasil
Stainless steels are known for their beauty and corrosion resistance. Ferritic stainless steels, without nickel, are responsible for the increase the consumption of stainless steels in the world, due to the economic advantage as compared to austenitic stainless steels. In the automobile industry, more specific in the cars exhaust system, the use of ferritic
Publicado em: 2009