Archive for June, 2007
Friday, June 29th, 2007
To illustrate the aluminium life cycle, what can be more relevant than the myth of the Fountain of Youth. In this myth, old persons enter a fountain of youth and are transformed back to their young and healthy selves. This myth is a good metaphor for recycling : considering that ...
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Friday, June 29th, 2007
Alumina is the most widely used oxide ceramic material. Its applications are widespread, and include spark plugs, tap washers, pump seals, electronic substrates, grinding media, abrasion resistant tiles, cutting tools, bioceramics, (hip-joints), body armour, laboratory ware and wear parts for the textile and paper industries. Very large tonnages are also ...
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Friday, June 29th, 2007
This paper describes a method for producing submicron high-purity alumina. In this method amorphous basic aluminum sulfate (BAS) was prepared by homogeneous precipitation of aluminum bisulfite solution containing chitosan. This cationic polymeric compound was used as an electrosteric dispersant. Submicron BAS was derived from an aluminum bisulfite solution (0.4 M ...
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Wednesday, June 27th, 2007
Basic aluminum sulfate can be prepared by homogeneous precipitation starting from admixtures of ammonium aluminum sulfate and ammonium bisulfite solutions. Powder agglomeration problems usually arise in wet precipitation processes mainly at high concentration of precursors. Some organic additives have been used in order to modify the physical and chemical properties ...
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Wednesday, June 27th, 2007
In this paper, we investigated the photolithographic properties of poly(N-tetradecylmethacryl-amide-co-t-butyl 4-vinylphenyl carbonate) [p(TDMA-tBVPC)] thin films prepared by Langmuir-Blodgett (LB) technique. The copolymer forms a stable monolayer on a water surface and LB films with any desired number of layers. The copolymer has a structure being subject to the main chain ...
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Friday, June 22nd, 2007
Corrosion Resistance
The corrosion resistance of titanium is well documented. A stable, substantially inert oxide film provides the material with outstanding resistance to corrosion in a wide range of aggressive media. Whenever fresh titanium is exposed to the atmosphere or to any environment containing oxygen, it immediately acquires a thin tenacious ...
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Friday, June 22nd, 2007
Titanium was first used in chemical plant in the mid-1960’s. Its outstanding resistance to corrosion in oxidising chloride environments, sea water and other aggressive media were rapidly established. In several processes titanium was the first and only choice for effective plant performance and acceptable levels of life cycle cost.
Performance of ...
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Thursday, June 21st, 2007
Copper and copper alloys are amongst the most versatile materials available and are used for applications in every type of industry. World consumption of copper now exceeds 18 million tonnes per annum.
Copper is well known for it’s conductivity but it has other properties that have been exploited in a wide ...
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Thursday, June 21st, 2007
Copper is the oldest metal used by man. It’s use dates back to prehistoric times. Copper has been mined for more than 10,000 years with a Copper pendant found in current day Iraq being dated to 8700BC. By 5000BC Copper was being smelted from simple Copper Oxides.
Copper is found as ...
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Thursday, June 14th, 2007
Gold and palladium are totally soluble in one another.
The primary use of gold / palladium alloys is in jewellery. The alloy is more commonly known as white gold and is an alternative to platinum. Gold / nickel alloys are also used as white gold. In both cases some other metals ...
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