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Method for producing composite of diamond and cemented tungsten carbide - Patent 4411672 A method as recited in claim 1, in which said composition of tungsten carbide and cobalt is hard sintered prior to placement in adjacency with the pulverized diamond. A method as recited in claim 1, in which said composition of tungsten carbide and cobalt is soft sintered prior to placement in adjacency with the pulverized diamond. The present invention relates to a method for producing a composite of diamond and cemented tungsten carbide, particularly to such material suitable for forming an abrasive element, a wire drawing die or other tools to be used in a severely abrasive environment. www.freepatentsonline.com /4411672.html   (1724 words)

Tungsten Rings New Tungsten Carbide ring collection by Avant-Garde co. Tungsten rings are the most wear resistant rings available today. Tungsten Rings are the most wear resistant bands available today. Tungsten carbide can only be scratched by diamonds and corundum family stones, or abrasive materials and tools containing corundum or diamond. titaniumstyle.com /tungsten-rings.htm   (595 words)

Tungsten Carbide - An Overview The first tungsten carbide-cobalt grades were soon successfully applied in the cutting and milling of cast iron and, in the early 1930’s, the pioneering cemented carbide companies launched the first steel-milling grades which, in addition to tungsten carbide and cobalt, also contained carbides of titanium and tantalum. The history of tungsten powder metallurgy, and especially that of the hardmetal industry, is characterized by a steadily widening range of available grain sizes for processing in the industry; while, at the same time, the grain size distribution for each grade of WC powder became narrower and narrower. A large portion of the tungsten volume in cemented carbide is today used in wear part applications, where there is a wide range of products from the very small (such as balls for ball-point pens) to large and heavy products, such as punches, dies or hot rolls for rolling mills in the steel industry. www.azom.com /details.asp?ArticleID=1203   (1132 words)

Welding - Tungsten Carbide Facts The properties of various tungsten carbide grades are determined by the composition of elements added and by the grain size. Tungsten carbide is generally regarded as a non-ductile material, with a Young’s modulus about 2-3 times that of steel. Many corrosive fluids contain abrasives, and tungsten carbides combined resistance to corrosion and abrasion is often the governing factor in choosing this material. www.corewire.com /TungstenCarbideFacts.asp   (780 words)

ATI Firth Sterling - Tungsten Heavy Alloy and Tungsten Carbide Solutions For Industry. Cemented carbides consist of hard grains of the carbides of transition metals (Ti, V, Cr, Zr, Mo, Nb, Hf, Ta, and/or W) cemented or bound together by a softer metallic binder consisting of Co, Ni, and/or Fe (or alloys of these metals). Tungsten carbide (WC), on the other hand, is a compound of W and C. Since most of the commercially important cemented carbides are based on WC as the hard phase, the terms "cemented carbide" and "tungsten carbide" are often used interchangeably. The properties of cemented carbides are affected by four primary material characteristics, namely, (i) the average grain size of the carbide phase, (ii) the weight or volume percent of the binder alloy present, (iii) the composition of the carbide phases, and (iv) the composition of the binder alloy. www.tungstenprod.com /faq.asp   (701 words)

02/11/1987 - Information on Hydro Carbide Tungsten, otherwise known as cemented tungsten carbide with colbalt binder. Cemented tungsten carbide, or "hard metal," is actually a mixture of tungsten carbide, cobalt, and sometimes other metals, such as titanium, or vanadium, and metal oxides or carbides. This NIOSH recommendation is based on their finding that for mixtures containing in excess of two percent cobalt, the contribution of the cobalt to the overall potential health hazard is greater than that of tungsten carbide and all other components. They are the NIOSH "Criteria for a Recommended Standard for Occupational Exposure to Tungsten and Cemented Tungsten Carbide (NIOSH Publication No. 77-227) and their Occupational Hazard Assessment: Criteria for Controlling Occupational Exposure to Cobalt" (NIOSH Publication No. 82-107). www.osha.gov /pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=19526   (536 words)

TUNGSTEN CARBIDE INSERT A small plate or slug of tungsten carbide alloy mounted in the crown or shank of a bit or in grooves on the outside surface of a reaming shell to provide wear-resistant or rock-cutting surfaces or edges. The term is sometimes incorrectly applied to diamond-set plates of tungsten carbide alloy inset as reaming surfaces in reaming shells b. Hemispherical-ended cylinders of sintered carbide are inserted in place of the usual teeth to give 10 to 15 times the total footage and 2 to 3 times the cutting rate. www.websters-online-dictionary.org /definition/english/tu/tungsten+carbide+insert.html   (270 words)

Tungsten Carbide Rings, tungsten bands, tungsten wedding rings, ring tungsten - WHY TUNGSTEN CARBIDE?   (Site not responding. Last check: ) Tungsten carbide rings are twice as hard as steel, four times harder than titanium and virtually unscratchable. For decades tungsten carbide has been used in mining, aerospace, and other industries that have required a metal that is extremely hard and long lasting. Tungsten carbide has become a worthy substitute to these precious metals due to it's brilliant forever lasting mirror like polish and resilient finish. www.infinitytungsten.com /content/view/1/2   (883 words)

Tungsten Rings Tungsten does not gain its extreme hardness until it is combined with a carbon alloy, transferring it into tungsten carbide (WC) with a hardness between 8.5 and 9.5 on the Mohs hardness scale. Tungsten carbide is four times harder than titanium, twice as hard as steel, is virtually unscratchable, and has been widely used for decades in industrial applications such as cutting tools, mining machinery, and rocket engine nozzles. Tungsten rings will not crush or bend out-of-round, so if you shut your hand in a car door or drop a heavy object on it, a tungsten wedding band is likely to fracture into several pieces and fall off your finger freely. www.e-weddingbands.com /store/tungsten_rings.html   (1490 words)

Specialty Blades: Materials: Tungsten Carbide   (Site not responding. Last check: ) With optimum grade selection, sub micron grain size tungsten carbide can be sharpened to a razor edge without the inherent brittleness frequently associated with conventional carbide. Cemented tungsten carbide is made by sintering (at high temperature) a combination of tungsten carbide powder with powdered cobalt (Co), a ductile metal that serves as a "binder" for the extremely hard tungsten carbide particles. The heat of the sintering process does not involve a reaction of the 2 constituents, but rather causes the cobalt to reach a near-liquid state and become like an encapsulating glue matrix for the WC particles (which are unaffected by the heat). www.specialtyblades.com /materials/tungsten_carbide.html   (569 words)

General Carbide - Grade Selection Guide Tungsten carbide in particle sizes from sub-micron to approximately 10 microns. For cemented carbides, the hardness will increase as the cobalt content and particle size of the tungsten carbide are decreased. The transverse rupture strength of a cemented carbide can be increased by increasing the binder content and, in some cases, by decreasing the particle size of the tungsten carbide. www.generalcarbide.com /grades/selection   (352 words)

Tungsten Carbide Jewelry, Bracelets and Pendants In an extraordinary process, Tungsten and Carbide powders are forged together at 2,400 degrees Fahrenheit to form bracelets and pendants that are virtually indestructible and scratch proof. Tungsten carbide is the perfect combination of unbelievable strength with style and comfort. Tungsten with carbon are ground into a powder and then compressed with high pressure dies to form a bracelet link or pendant blank. www.xtremejewelers.com   (519 words)

Tungsten Carbide When a mixture of powdered tungsten metal and carbon powder are raised to a very high temperature by an arc of electricity, while the whole mass is held in a carbon crucible, there is a complete chemical combination of the two elements to form a big lump of tungsten carbide WC. Next the combined tungsten carbide and cobalt pre-forms are sintered or fused into a solid mass by heating them to a high temperature in a vacuum or hydrogen atmosphere furnace. The same exactness of chemistry and physical properties in tungsten carbide that are experienced with alloy metals cannot be expected, as T.C. is made from a physical mixture of a pure metal powder and a powdered ceramic. www.baltecballs.com /tungsten-carbide.htm   (805 words)

Tungsten carbide products from Philadelphia Carbide: the extraordinary properties of tungsten carbide for machine parts ... Rigidity - Tungsten carbide compositions range from two to three times as rigid as steel and four to six times as rigid as cast iron and brass. Tungsten carbide's low thermal expansion rate must be carefully considered when preforms are provided for grinding or EDM. - Tungsten carbide compositions have exceptional resistance to galling and welding at the surface. www.philacarbide.com /Properties.htm   (544 words)

About Basic Carbide Tungsten carbide, or WC, has a number of unique and impressive characteristics, the most significant being the ability to resist abrasion. Tungsten carbide has a compressive strength greater than any other metal or alloy and is three times more rigid than steel. Tungsten carbide compositions have exceptional resistance to galling and welding at the surface and can withstand cryogenic temperatures to -453°F (-269.44°C) while retaining their toughness and abrasive qualities. www.basiccarbide.com /about.htm   (751 words)

Tungsten Carbide Rings Alone, tungsten is vulnerable to scratches and damage just like any other metal, it gains its extreme hardness by being combined with a carbon alloy, transforming it into tungsten carbide, with a hardness between 8.5 and 9.5 on the Mohs hardness scale. The strength of tungsten carbide has made it widely used for decades in industrial applications - it is four times harder than titanium, twice as hard as steel and almost impossible to scratch. Many manufacturers of tungsten carbide wedding band rings use cobalt as a binder, mostly because it is cheaper to produce. www.titaniumkay.com /Mens-Tungsten-Carbide-Rings-100401.html   (481 words)

Cardiff Carbides Tungsten Carbide Educational Page   (Site not responding. Last check: ) The material referred to as tungsten carbide, or hardmetal, is a combination of tungsten carbide and a binder such as cobalt. The benefit of adding the cobalt binder to tungsten carbide is to improve the shock resistance properties. When the tungsten carbide and binder are blended a small percentage of wax is added to the mixture. www.artisancarbide.com /ccedu.htm   (331 words)

Tungsten carbide wear parts: a new tool for cutting crushing costs Tungsten carbide, a material known for more than 70 years, opens up new possibilities concerning wear minimization in stone applications through both development of new materials and targeted analysis of application technology. Tungsten carbide was originally applied to the stone industry in the form of tipped chisels and drills. Use of tungsten carbide for wear protection in mills and sifters where abrasion is the determining factor in tool life can achieve tremendous results. rockproducts.com /mag/rock_tungsten_carbide_wear_2   (885 words)

My Wedding Ring: Tungsten Carbide ~ Chris Pirillo She said the only problem with Tungsten Carbide rings is that if you ever get into an accident and need a MRI and they cannot give you one, if your ring will not come off. Tungsten Carbide is the metal that is used for Carbide tips on saws and other cutting tools. If tungsten alone or in combination with other metals is causing the disease in children, he said, then it would be possible to prevent future clusters caused by metals in the environment. chris.pirillo.com /2006/11/05/my-wedding-ring-tungsten-carbide   (3169 words)

Tungsten carbide products from Philadelphia Carbide: the extraordinary properties of tungsten carbide for machine parts ... Tungsten carbide is a ceramic material composed of approximately a 1:1 ratio of tungsten and carbon atoms. Tungsten carbide is widely used in industry because of its extraordinary properties. Because of its wear resistance and hardness (9.8 Moe's scale), tungsten carbide is ideally suited for wear parts, other machine parts and dies which are subject to severe service conditions. www.philacarbide.com /Challenges.htm   (148 words)

Joy Jewelers: Tungsten Rings FAQ Because Tungsten Carbide is one of the world's hardest metals, special machinery is required to engrave on it. Elemental tungsten is a white to steel gray metal (depending on the purity) that can be used in pure form or mixed with other metals to make alloys. Most tungsten metal powder is converted to tungsten carbide (WC) by reaction with pure carbon powder, e.g. www.joyjewelers.com /faqs/tungsten_rings_faq.php   (1031 words)

Tungsten Carbide Power Tungsten carbide powder is the intermediate in the line from W powder to cemented carbides. By far the biggest percentage is manufactured by the conventional method -carburization of tungsten powder- and covers the widest range of powder qualities in regard to average grain size (0.15 — 12 µm). The conventional process of carburization comprises mixing of the respective tungsten powder of desired grain size with high purity carbon (lamp fl or graphite) and reacting at temperatures between 1300 to 1600 °C in hydrogen atmosphere. www.itia.org.uk /Default.asp?page=46   (262 words)

TCE :: Tungsten Carbide Tube Tungsten carbide tube is recommended for eroding holes in any of these, including steel with superb electrode life. The main disadvantage with tungsten carbide tube is the low metal removal rate. Since tungsten carbide can only be machined with diamond cutting tools or by EDM, it is not practical to produce formed electrodes, and for this reason we do not offer it in large or round bars or plate form. www.tokaicarboneurope.com /metallics/tungcarb.php   (186 words)

US Customs Reclassifies Tungsten Carbide Wear Pads for Blades Used with Snow Plows and Motor Grades, Eliminates Duty ... The merchandise in question is described as tungsten carbide wear pads or inserts that form the cutting edge or working part of blades on snow plows, motor graders and bulldozers. At issue is whether the tungsten carbide wear pads are parts solely or principally used with earth moving machines. US Customs has determined that the pads become an integral part to the blade of the machine and that when the pads become worn the entire blade is replaced-the earlier ruling stated that when the wear pad wore out it was simply replaced by another pad. www.tdctrade.com /alert/us0001h.htm   (209 words)

"Tungsten Carbide powders" With the latest price increases of tungsten carbide powders, it has again become economical to reclaim cemented carbide material. Tungsten Heavy Powder is able to toll your material as well as supply you with reclaimed carbide powder from material that we buy. In this process, cemented carbide scrap is treated in molten zinc or zinc vapor, which reacts with the binder to form intermetallic phases and a zinc-cobalt alloy. www.tungsten-heavy-powder.com /Tungsten_Heavy_Powder/Tungsten_Carbide/tungsten_carbide.html   (184 words)

Tungsten Carbide: Apex Knives Pvt Ltd   (Site not responding. Last check: ) Tungsten carbide is the ideal material for many applications due to its high hardness, high compressive strength, resistance to high temperatures, dramatic wear-resistance and excellent toughness. Cobalt binders for toughness and nickel alloy binders for corrosion resistance are the matrix for the wear-resistant grains of tungsten carbide and its alloys. Tungsten carbide knives will perform 10 to 25 times longer than standard knives. www.apexknives.com /tungsten.htm   (194 words)

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