scholarly journals Uso do Nióbio como refinador de grão para Ligas de Alumínio-Silício

2016 ◽  
Vol 11 (30) ◽  
pp. 37-45
Author(s):  
Alexandre Leão Quadro ◽  
Antônio Luiz Ribeiro Sabariz ◽  
Marco Túlio Raposo
Keyword(s):  
Icp Oes ◽  
Aluminum Association

Com o objetivo de encontrar alternativas para o refino de grão de ligas alumínio-silício, um novo refinador foi experimentalmente produzido à base de nióbio, boro e alumínio (Al-3%Nb-1%B). Esta nova liga foi caracterizada quimicamente por espectroscopia de emissão óptica por plasma acoplado indutivamente (ICP-OES), microestruturalmente por microscopia eletrônica de varredura (MEV) e por espectrometria de energia dispersiva (EDS). Foi utilizado o teste TP1, da Aluminum Association, para medir a capacidade de refino desta nova liga sobre a liga Al-11%Si-0,1%Mg e compará-la com o refinador convencional TiBAl 5/1 (5% de titânio e 1% de boro). O tamanho de grão foi medido com uma lupa estereoscópica utilizando o método do intercepto da ABNT. Para os cinco minutos iniciais, o teste TP1 realizado com 1 kg/t da liga Al-3%Nb-1%B apresentou tamanhos de grãos semelhantes ao teste realizado com 5 kg/t de TiBAl 5/1, indicando que este novo refinador pode ser utilizado industrialmente para o refino de grão de ligas alumínio-silício, desde que o tempo de residência seja próximo de 5 minutos.

Comparison of physicochemical properties of edible vegetable oils commercially available in Bahir Dar, Ethiopia

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Physicochemical Properties ◽  
Vegetable Oils ◽  
Relative Viscosity ◽  
Acid Value ◽  
Smoke Point ◽  
Refractive Indices ◽  
Bahir Dar ◽  
Icp Oes ◽  
Saponification Value ◽  
Oil Sunflower

The physicochemical properties of six imported and one locally produced edible vegetable oils (soybean oil, sunflower oil, sunlit oil, hayat oil, avena oil, USA vegetable oil and Niger oil) purchased from Bahir Dar city, Ethiopia, were examined for their compositional quality. All the oil samples were characterized for specific gravity, moisture content, color, relative viscosity, refractive indices, ash content, peroxide value, saponification value, smoke point, acid value, free fatty acid value and trace metals contents using established methods. The result clearly indicates that some of the oil samples exhibited unacceptable value when compared with physicochemical parameters recommended by the Codex Alimentations Commission of FAO/WHO and the specification of Ethiopian standards. The contents of nickel (Ni), copper (Cu) and iron (Fe) in seven samples were determined using ICP-OES and their concentrations were found in the range of 1.8-20.4, 45.8-82.2 and 136.04-445.0 mg/kg, respectively.

ALCOA ULTRALLOY X6020

Alloy Digest ◽  
1996 ◽  
Vol 45 (12) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Lead Free ◽  
Aluminum Association ◽  
Wire Rod ◽  
Series Alloy ◽  
6Xxx Series

Abstract UltrAlloy is a lead-free, enhanced machining product with the inherent benefits of a 6xxx-series alloy. The alloy is produced as a cold-finished rod and bar with strength levels comparable to 6262. The alloy is registered with the Aluminum Association as X6020. This datasheet provides information on composition, microstructure, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, machining, joining, and surface treatment. Filing Code: AL-340. Producer or source: ALCOA Wire, Rod & Bar Division. Originally published September 1996, corrected December 1996.

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