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Topic: Aluminum oxide


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  Sandblasting Media, Grit Blasting, Abrasive Sandblasting, Abrasive Blasting Media, Abrasive Blast Media
Aluminum Oxide is a sharp, long-lasting abrasive sandblasting cutting media that can be re-used many times for grit blasting.
White Aluminum Oxide is a 99.5% ultra-pure grade of blasting media.
White Aluminum Oxide is increasingly being used in critical, high performance processes such as microdermabrasion.
www.kramerindustriesonline.com /blasting-media.htm   (453 words)

  
  Aluminum - MSN Encarta
For example, when thermite (a mixture of powdered iron oxide and aluminum) is heated, the aluminum rapidly removes the oxygen from the iron; the heat of the reaction is sufficient to melt the iron.
Aluminum is never found as a free metal; commonly as aluminum silicate or as a silicate of aluminum mixed with other metals such as sodium, potassium, iron, calcium, and magnesium.
Bauxite, an impure hydrated aluminum oxide, is the commercial source of aluminum and its compounds.
encarta.msn.com /encyclopedia_761575249/Aluminum.html   (857 words)

  
 Electrochemistry Encyclopedia --- Anodizing
Aluminum is unique among these metals in that, in addition to the thin barrier oxide, anodizing aluminum alloys in certain acidic electrolytes produces a thick oxide coating, containing a high density of microscopic pores.
Aluminum cations move outward from the metal to react with water at the oxide/electrolyte interface to form oxide at that surface.
Porous aluminum oxides are most commonly grown in dilute sulfuric acid, typically 10 weight percent concentration, but there also are commercial processes using phosphoric acid, chromic acid, oxalic acid, and mixtures of inorganic and organic acids.
electrochem.cwru.edu /ed/encycl/art-a02-anodizing.htm   (3566 words)

  
 Materials — Aluminum Oxide (Al2O3) Properties
Aluminum Oxide, Al Alumina is the most cost effective and widely used material in the family of engineering ceramics.
Aluminum oxide, commonly referred to as alumina, possesses strong ionic interatomic bonding giving rise to it’s desirable material characteristics.
Alpha phase alumina is the strongest and stiffest of the oxide ceramics.
www.accuratus.com /alumox.html   (407 words)

  
 Scientific discovery: Why aluminum doesn't rust: 5/00
But the fact is that pure aluminum reacts so readily with water that, according to the laws of chemistry, the aluminum shell of an airplane should actually dissolve in the rain.
Fortunately for the airline industry, when aluminum metal is placed in the atmosphere, a thin layer, known as aluminum oxide, forms on the metal's surface and acts like a protective, rust-resistant shield.
Aluminum oxide consists of atoms of aluminum and oxygen bonded together.
news-service.stanford.edu /news/2000/may17/aluminum-517.html   (581 words)

  
 TEE Reference Data Sheet for Aluminum
Aluminum is the most abundant metal in the earth's crust, and the third most abundant element; however, elemental aluminum does not occur in nature.
Pure aluminum is soft and lacks strength, but can easily be formed, machined, or cast; has a high thermal conductivity; and has excellent corrosion resistance due to a protective coating of aluminum oxide formed on the surface (this coating is at times deliberately thickened in the process of "anodizing").
Aluminum particles, when in dust, powder, or flake forms from operations such as manufacturing powder, grinding, finishing, and processing, may be suspended as a dust cloud in air and consequently may ignite and cause serious damage.
www.meridianeng.com /aluminum.html   (2061 words)

  
 Aluminum (Al)   (Site not responding. Last check: 2007-10-26)
When aluminum is exposed to the air, it quickly becomes covered with a tough, transparent layer of aluminum oxide that resists further corrosive action.
Aluminum is the most abundant metallic element in the crust of the earth (8.1%); only oxygen and silicon (nonmetals) are more abundant.
Anhydrous aluminum chloride is important in both the oil and synthetic-chemical industries.
www.bayerus.com /msms/fun/pages/periodic/aluminum   (219 words)

  
 Aluminum - An Essential Metal
Aluminum, on the other hand, was not "discovered" until 1808 (less than 200 years ago) although early civilizations used aluminium-bearing clays to make pottery and aluminum salts were used in making dyes and medicines.
Aluminum is a metallic element with the symbol Al.
Aluminum can be very strong, light (less than one third the specific gravity of steel, copper or brass), ductile, and malleable.
www.rocksandminerals.com /aluminum/aluminum.htm   (912 words)

  
 Aluminum oxide (UK PID)
Aluminium oxide is used as an industrial catalyst, adsorbant, desiccant, and as a filler for paints and varnishes.
The presumed low toxicity of inhaled aluminium oxide led in the past to its use as a prophylactic agent against silicotic lung disease in miners but this practice was abandoned in the 1970's amid concern that chronic exposure may be harmful.
The intestinal absorption of aluminium and its oxide is enhanced by citrate (which is found frequently in effervescent drug formulations) and reduced by silica.
www.intox.org /databank/documents/chemical/alumoxde/ukpid33.htm   (5026 words)

  
 About Alumium: Dave Wright Welding - Specialty metals welding & fabrication
The atomic number of aluminum is 13; the element is in group 13 (IIIa) of the periodic table.
The atomic weight of aluminum is 26.9815; the element melts at 660° C (1220° F), boils at 2467° C (4473° F), and has a specific gravity of 2.7.
The oxide of aluminum is amphoteric-showing both acidic and basic properties.
www.davewrightwelding.com /Aluminum/about_aluminum.htm   (729 words)

  
 Aluminum
Aluminum appears to be a copper antagonist as is cadmium.
The levels of aluminum found in spleen were significantly increased by gluconic and ascorbic acids, whereas gluconic and oxalic acids also raised the concentrations of aluminum found in kidneys.
Aluminum toxicity has to be considered a primary way that copper gets depleted, and hence a primary cause of the copper deficiency diseases: collagen failure, hernias, high cholesterol, heart disease, aneurysms, and hyperthyroidism.
www.ithyroid.com /aluminum.htm   (2101 words)

  
 Aluminum Smelting and Refining
Aluminum is primarily used to produce pistons, engine and body parts for cars, beverage cans, doors, siding and aluminum foil.
Aluminum oxide from the Bayer Process is then reduced to aluminum metal usually using the Hall-Heroult process.
The aluminum sinks to the bottom where it is removed from the tank and sent to a melting or holding furnace.
www.p2pays.org /ref/01/text/00778/chapter4.htm   (1548 words)

  
 aluminium
The compounds of greatest importance are aluminum oxide, the sulfate, and the soluble sulfate with potassium (alum).
The solute and particulate aluminum chemistry of a relatively unpolluted snowfall associated with a maritime airmass was measured by neutron activation analysis and inductively-coupled plasma analysis (soluble fraction) and neutron activation analysis (particulate material), to characterize background conditions for the Scottish Highlands.
Aluminum concentrations were compared to those found in a polluted fl snowfall with a trajectory that originated over eastern Europe and to those levels found in seasonal snowpack.
www.speclab.com /elements/aluminum.htm   (1770 words)

  
 Aluminum
Aluminum is the most abundant metallic element in the earths crust and the third most abundant of all elements behind oxygen and silicon found in the earths crust.
This is referred to the reduction process, the heavy aluminum molecules sink to the bottom of the pot and the lighter oxygen molecules rise to the surface and are collected by gas collection systems known as dry scrubbers.
The aluminum is approximately 99.5% to 99.8% pure, with its major impurities being iron, manganese, and silicon.
oak.cats.ohiou.edu /~jb357900/info-pub.htm   (1057 words)

  
 Lorin - About aluminum
Aluminum is the most abundant metallic element on the planet.
The chief ore of aluminum is bauxite, a mixture of hydrated aluminum oxide and hydrated iron oxide.
The age of aluminum dawned in the late 1800’s when large volume smelters were born.
www.lorin.com /Aluminum.asp   (154 words)

  
 Procera® Aluminum Oxide Crown Abstracts
An outer layer of veneer porcelain (approximately 0.4 to 0.6 mms in thickness) is fused to the aluminum oxide using a shade that matches the color of adjacent teeth to achieve the desired esthetic result.
The aluminum oxide disks were also divided into three groups; 5 samples were roughened with a diamond bur to form one group, 5 were roughened and then polished with Dialite polishing points (Braessler), 5 were roughened, polished and then glazed but not polished.
An aluminum oxide disk was aligned opposing a human enamel sample and a load of 453.6 g was applied axially.
www.umich.edu /~nbumictr/Restorative-procera/allceram/allceram_crown/abstracts.html   (8448 words)

  
 The Amazing Rusting Aluminum - Popular Science
In crystal form, aluminum oxide is called corundum, sapphire or ruby (depending on the color), and it is among the hardest substances known.
By rusting, aluminum is forming a protective coating that’s chemically identical to sapphire—transparent, impervious to air and many chemicals, and able to protect the surface from further rusting: As soon as a microscopically thin layer has formed, the rusting stops.
Applied to aluminum’s surface, mercury will infiltrate the metal and disrupt its protective coating, allowing it to “rust” (in the more destructive sense) continuously by preventing a new layer of oxide from forming.
www.popsci.com /popsci/how20/09550e0796b84010vgnvcm1000004eecbccdrcrd.html   (503 words)

  
 Chemical of the Week -- Aluminum
Molten aluminum metal is produced at the cathode, and it sinks to the bottom of the vat.
Aluminum metal is made the anode in an electrolytic cell, where aluminum metal is oxidized, and its protective oxide coating is thickened.
Because the aluminum is already in the metallic state, all of the energy spent in purifying the ore and reducing it to the metal is saved when aluminum is recycled.
scifun.chem.wisc.edu /chemweek/Aluminum/ALUMINUM.html   (766 words)

  
 Chemtrails And Aluminum Harm Heart, Lungs And Plants
Chemtrails which are known to contain heavy metals such as barium oxide and aluminum oxide, are known to be a bigger problem than once thought.
Ironically, the Aluminum oxide is also used as environmental catalysts used for remediating polluted soil.
Oppenheimer wrote a paper many years ago how barium oxide and aluminum oxide could be dispersed at very high altitude to reflect the sun's heat back into space, would stay suspended for some period of time.
www.rense.com /general69/chemd.htm   (1137 words)

  
 Aluminum Production   (Site not responding. Last check: 2007-10-26)
Aluminum is the most abundant metal in the Earth's crust and third element surpassed only by Oxigen and Silicon) but it is tightly bound in its compounds in nature.
The main Aluminum ore is known as bauxite, that is a mineral where Aluminum oxide (Al2O3) is found associated with 1, 2 or 3 water molecules.
Aluminum is extracted (not made!) with a strong base (that forms Aluminum hidroxide) and after heated to reform the oxide.
www.newton.dep.anl.gov /askasci/chem99/chem99461.htm   (480 words)

  
 Aluminum Anodizing   (Site not responding. Last check: 2007-10-26)
Aluminum anodizing and its associated processes — industrial hard coat anodizing, conventional anodizing (also known as sulfuric anodizing), Metabrite™, chromate conversion, and casting impregnation — combine to make aluminum even more useful, and in more ways than ever.
Type II conventional anodizing typically produces a thin (.1-.4 mil) coating of aluminum oxide that is tightly bonded to the surface of the aluminum.
Industrial hard coat anodizing deposits a thick layer of aluminum oxide both on and in the surface of the aluminum, resulting in a surface hardness approaching that of diamonds.
www.fortwayneanodizing.com /01_Pages/aluminum-anodizing.htm   (483 words)

  
 Aluminum Association | Alumina
Aluminum originates as an oxide called alumina, and because aluminum itself does not occur in nature as a metal, the prcessing of aluminum took a giant leap forward with the advent of electricity.
Direct current electricity is passed from a consumable carbon anode into the cryolite, splitting the aluminum oxide into molten aluminum metal and carbon dioxide.
While continual progress has been made over the more than 110-year history of aluminum processing to reduce the amount of electricity used, there are currently no viable alternatives to the electrometallurgical process.
www.aluminum.org /Content/NavigationMenu/The_Industry/-Alumina/Alumina.htm   (201 words)

  
 ALUMINUM OXIDE
Synonyms: AluminAR® CC-10; Aluminum oxide; Alumina; activated Alumina; alpha-Alumina
Use protective clothing and breathing equipment appropriate for the surrounding fire and to protect against the aluminum oxide dust that may be dispersed in the air.
Whatever cannot be saved for recovery or recycling should be managed in an appropriate and approved waste disposal facility.
www.jtbaker.com /msds/englishhtml/a2844.htm   (836 words)

  
 Resistivity of Aluminum Oxide
Aluminum oxide, also known as alumina, is one of the most commonly used materials in engineering ceramics.
Aluminum oxide is an electrically insulating material with high resistivity that increases with purity With its high corrosion resistance, it does not wear easily, even against strong acid.
Since aluminum oxide covers all aluminum metal, it is responsible for the metal's resistance to weathering.
hypertextbook.com /facts/2006/EuniceHuang.shtml   (289 words)

  
 It's Elemental - The Element Aluminum
Although aluminum is the most abundant metal in the earth's crust, it is never found free in nature.
Today, aluminum and aluminum alloys are used in a wide variety of products: cans, foils and kitchen utensils, as well as parts of airplanes, rockets and other items that require a strong, light material.
Aluminum oxide is also used to make synthetic rubies and sapphires for lasers.
education.jlab.org /itselemental/ele013.html   (485 words)

  
 Polishes Cerium Oxide Aluminum Oxide Alumina Tin Oxide Diamond Powder Crystalite Diamond Spray Italdo Diamond Spray ...
Aluminum Oxide "A" is used for polishing tourmaline, beryl, garnet, topaz, peridot, danburite, etc. Sometimes topaz, peridot and danburite don't polish well with Aluminum Oxide and polishing with diamond is required.
Aluminum oxides labeled as "A" are not all equal in quality or performance.
Chrome oxide is commonly used to polish jade, diopside, tourmaline and peridot.
www.facetingmachines.com /polishes.shtml   (983 words)

  
 American Elements: Aluminum Supplier & Technical Information
Aluminum is available as metal and compounds with purities from 99% to 99.9999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder.
Oxides are available in forms including powders and dense pellets for such uses as optical coating and thin film applications.
Aluminum is available in soluble forms including chlorides, nitrates and acetates.
www.americanelements.com /al.html   (529 words)

  
 aluminum welding procedures
Aluminum oxide should be cleaned from the surface prior to welding.
For more information on aluminum welding processes, benefits of welding processes, welding discontinuities, or common welding problems please visit our homepage or any of the links to your left.
Aluminum oxide melts at about 3700 degrees F. Aluminum comes in heat treatable and nonheat-treatable alloy.
www.weldingengineer.com /Aluminum.htm   (888 words)

  
 ALUMINUM OXIDE IN WORKPLACE ATMOSPHERES - (Inorganic Method #198sg)
Originally, aluminum oxide samples were collected on an AA filter, digested by acid digestion, and analyzed by AAS.
It is very important that when aluminum or salts of aluminum are known to be present in the workplace atmosphere, they should be listed.
Aluminum working standards are made by diluting the stock solution with deionized water and by adding enough KCl solution to prepare the standards in 1000 ppm KCl.
www.osha.gov /dts/sltc/methods/inorganic/id198sg/id198sg.html   (1133 words)

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