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Roger Weller, geology instructor

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tungsten
Mary McCarthy
Physical Geology
Spring 2014
                  

  

The Beauty of Tungsten Rings
 

Tungsten was first found in Sweden in 1781, credited to be found by Josť and Fausto Elhuyar because they succeeded in isolating the element from tungstic acid. The word tungsten comes from the Swedish language Tung sten directly translatable to heavy stone. It is also known as Wolfram. It is a steel gray-white, heavy metal that is remarkable for its robust physical properties. It has the highest melting point than any other non-alloy. Also Tungsten carbide, a compound of tungsten and carbon, is one of the hardest known substances and is the most common material to make milling and turning tools.
 

 Description: 250px-Wolfram_evaporated_crystals_and_1cm3_cube.jpg Description: hstone.gif

Also it is used as a scratch- resistant for jewelry. This brings us to Tungsten rings. Tungsten measures between 8 and 9 on the Mohs hardness scale. It is the only exotic metal that can be permanently polished and is the most wear resistant.  Tungsten is about 10 times harder than 18K Gold, 5 times harder than tool steel, and 4 times harder than titanium. The rings will hold their shape and shine longer than any other ring, and will not bend or scratch. There have been cases where the Tungsten ring has broken with enough force or on a hard surface.
 

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How Tungsten Rings are made:

 Ground tungsten and carbon are poured into a metal die cube containing a ring mold. The mold is subjected to high pressure to push the powder together into a solid ring blank. The blank is then fired in an oxygen-powered furnace at temperatures exceeding 6,000 degrees Fahrenheit. Only at this obscenely high temperature will the blank's component elements intermingle and solidify as one. Once cooled, any burs or extra metal is removed with high-powered diamond edged saws. . Within the cutting process many different things can be done to design the perfect tungsten Ring. You can have inlay of gold and silver even tungsten ceramic rings. Faceted Tungsten Rings, the ever elegant and popular Celtic tungsten rings, Laser Etched, this is also the only time that an engraving can be done and the only time that the size of the ring can be determined. Due to the hardness of the tungsten carbide you have to know what size you wear when you order your ring, because once the ring is completed it cannot be resized. After the sizing, Diamond powdered files and sanders are then used to polish the ring until it shines.            

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Description: http://patentimages.storage.googleapis.com/US7761996B2/US07761996-20100727-D00000.png

If you are looking at getting a Tungsten ring, I know from experience that they are awesome and is the best ring I have ever gotten. The only problem is that it does scratch which doing the research on tungsten I found that what I wear is called a Tungsten-only ring which is basically a steel ring. It is very hard, but NOT scratch proof. Some of the retailers still call them Tungsten Carbide so be careful.  Some of the low priced rings seen on discount websites do not include Carbide; a Tungsten Carbide ring can only be scratched by a diamond or a product containing the mineral corundum.

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First time bought                              After 5 months

 

 

Works citied

http://en.wikipedia.org/wiki/Tungsten

http://www.newworldencyclopedia.org/entry/Tungsten

http://www.elite-tungsten-rings.com/how-are-tungsten-carbide-rings-made

http://www.titanium-jewelry.com/about-tungsten.html

http://www.ehow.com/how-does_4760340_making-tungsten-rings.html

 

Photo citied

http://en.wikipedia.org/wiki/File:Wolfram_evaporated_crystals_and_1cm3_cube.jpg

http://www.tungsten.com/mtstung.html

http://www.forevermetals.com/grooved-tungsten-bands/

http://image.dhgate.com/albu_396510910_00/1.0x0.jpg

http://www.google.com/patents/US7761996