scholarly journals Remelting of highly polluted metallic aluminium scrap with ecological refining reagents

2019 ◽  
Vol 537 ◽  
pp. 062087
Author(s):  
V E Ibragimov ◽  
V Yu Bazhin
Keyword(s):  
Metallic Aluminium

Aluminium contamination via assisted leaching from metallic aluminium utensils at neutral pH

1992 ◽  
Vol 21 (1) ◽  
pp. 79-81 ◽  
Author(s):  
K. Tennakone ◽  
W. A. C. Perera ◽  
A. C. Jayasuriya
Keyword(s):  
Neutral Ph ◽  
Metallic Aluminium

Vulcanization of Rubber. By Organic Peroxides or by Ammonium Persulphate

1930 ◽  
Vol 3 (2) ◽  
pp. 195-200 ◽  
Author(s):  
Iwan Ostromislensky
Keyword(s):  
Benzoyl Peroxide ◽  
Organic Peroxides ◽  
Ammonium Persulphate ◽  
Aluminium Powder ◽  
Metallic Oxides ◽  
Vulcanized Rubber ◽  
Viscous Mass ◽  
Metallic Aluminium ◽  
Short Time ◽  
Rubber Product

Abstract 1. Organic peroxides vulcanize rubber not only in the absence of sulphur but likewise without any foreign substances such as metallic oxides or accelerators of any kind. 2. Rubber vulcanized by means of an adequate amount of benzoyl peroxide (10 to 30 per cent.) gives a soft rubber product which does not differ in point of physical properties from products cured with sulphur, or rather with sulphur chloride. 3. The process of vulcanizing rubber with benzoyl Superoxide is completed in a relatively short time even at a fairly low temperature, sometimes even in two minutes at 119° C., corresponding to 13 pounds pressure. 4. Vulcanization of rubber by means of peroxides may lead to the formation of a soft, transparent and elastic product, which is almost entirely colorless. 5. The products in question vulcanized by means of various peroxides are gradually converted to a very sticky and viscous mass. 6. Sulphur protects the vulcanizates in question from such decomposition or oxidation. However, the products obtained in vulcanization of rubber with organic peroxides in the presence of sulphur are opaque. 7. As distinguished from sulphur, selenium, tellurium, their sulphides, metal oxides (in particular, lead oxide) as well as amines (aniline), tannic acid, and metallic aluminium powder not only do not protect the peroxide vulcanized rubber products from decomposition or oxidation but, on the contrary, they accelerate such processes quite considerably. 8. Benzoyl peroxide is the active vulcanizing agent in the process of heating rubber with a mixture of sulphur and benzoyl peroxide. 9. When rubber is subjected to the action of a mixture of some nitrobenzenes and benzoyl peroxides, vulcanization is effected exclusively by the nitrobenzenes, and the benzoyl peroxide remains altogether passive. 10. Ammonium persulphate vulcanizes rubber completely, resulting in a porous product which, generally speaking, is of small practical value.

Analysis of the oxide occurrence on WEDM surfaces in relation to subsequent surface treatments

2019 ◽  
Vol 234 (3) ◽  
pp. 721-733 ◽  
Author(s):  
K Mouralova ◽  
T Prokes ◽  
L Benes
Keyword(s):  
Electrical Discharge Machining ◽  
Surface Oxidation ◽  
Nickel Superalloy ◽  
Surface Treatments ◽  
Hadfield Steel ◽  
Inconel 625 ◽  
High Tendency ◽  
Surface Protection ◽  
Visual Appearance ◽  
Metallic Aluminium

Surface treatments are typical surface protection against corrosion or serve to create an attractive appearance for the end customer. However, the surface to which they are applied must be completely oxide-free, otherwise, defects occur which can cause subsequent corrosion or deterioration of the visual appearance of the product. The parts manufactured by wire electrical discharge machining, however, have a high tendency to oxidize. For this reason, this study was aimed at demonstrating the effect of machine setup parameters (gap voltage, pulse on and off time, wire feed and discharge current) on oxygen occurrence on the surface of two non-metallic (aluminium alloy 7475-T7351, chromium nickel superalloy Inconel 625) and four metallic materials (tool alloy steel X210Cr12, Hadfield steel, Creusabro 4800 and Hardox 400). Within this study, 18 samples were produced, where the chemical composition of energy-dispersive X-ray was analysed, on the basis of which the effect of these parameters on the surface oxidation was proved.

scholarly journals Consideration on the Deoxidation Mechanism of Steel by Metallic Aluminium

1965 ◽  
Vol 51 (9) ◽  
pp. 1617-1623 ◽  
Author(s):  
Akira ADACHI ◽  
Nobuya IWAMOTO ◽  
Yoshinori UEDA
Keyword(s):  
Metallic Aluminium

scholarly journals The apparent sizes of atoms in metallic crystals with special reference to aluminium and indium, and the electronic state of magnesium

1940 ◽  
Vol 177 (968) ◽  
pp. 27-37 ◽  
Keyword(s):  
Experimental Data ◽  
Special Reference ◽  
Solid Solutions ◽  
Brillouin Zone ◽  
Abrupt Change ◽  
Atomic Radius ◽  
Previous Suggestion ◽  
Interatomic Distances ◽  
The Face ◽  
Metallic Aluminium

The interatomic distances in crystals of alloys cannot be accounted for by assigning a fixed atomic radius to each kind of atom, and the causes of this variation are discussed with special references to the Brillouin zone characteristics of different structures. According to the theory of Jones, the effect of an overlap across the side of a Brillouin zone is to compress the zone at right angles to the face concerned, and so to expand the crystal lattice in the same direction. This expansion is not a property of an atom which can be transferred to any of its alloys, but is a characteristic of a structure with sufficient electrons to produce an overlap. The lattice spacings of alloys of aluminium and indium with copper, silver, gold, and magnesium are examined, and the apparent sizes of the aluminium and indium atoms are discussed, and are shown to be in agreement with the theory. The previous suggestion, that in metallic aluminium the atoms exist in an incompletely ionized state, is improbable, and is no longer required in order to explain the facts. New experimental data for the lattice spacings of solid solutions of aluminium and indium are presented, and these show that, whilst the curves connecting the a parameter with the composition are smooth and continuous, the corresponding curves for the c parameter show an abrupt change in direction at about 0.75 atomic % of indium or aluminium. This is taken to imply that, although in metallic magnesium with two electrons per atom, the overlap of the first Brillouin zone is in the a direction only, the structure is so near to the stage at which the c overlap sets in that the addition of less than one electron per hundred atoms causes the c overlap to take place.

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