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Topic: Tantalum carbide

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Tantalum

	Tantalum - Wikipedia, the free encyclopedia
		Tantalum is used in surgical instruments and implants because it does not react with body fluids.
		Tantalum electrolytic capacitors exploit the natural tendency of tantalum to form a protective oxide surface layer, using tantalum foil as one plate of the capacitor, the oxide as the dielectric, and an electrolytic solution as the other plate.
		Tantalum ores are mined in Australia, Brazil, Egypt, Canada, the Democratic Republic of the Congo, Mozambique, Nigeria, Portugal, Malaysia and Thailand.
	en.wikipedia.org /wiki/Tantalum (854 words)

	Tantalum carbide - Wikipedia, the free encyclopedia
		Tantalum carbide (TaC) is an extremely hard refractory ceramic material, commercially used in tool bits for cutting tools.
		It is sometimes used as a fine-crystalline additive to tungsten carbide alloys.
		Tantalum carbide-graphite composite material, developed in Los Alamos National Laboratory, is one of the hardest materials ever synthetized.
	en.wikipedia.org /wiki/Tantalum_carbide (95 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Tantalum carbide is an effective x-ray producing material, as well as a material that has a relatively low coefficient of thermal conductivity.
		Moreover, the composition of tantalum carbide allows a thicker layer of the material be used in x-ray target assembly 100 without the portion of the material functioning as the thermal buffer 106 excessively attenuating the x- rays produced by the portion of the material functioning as the x-ray generating layer 102.
		Thus, tantalum carbide is an example of a material that can be employed as both the x-ray generating layer 102 and thermal buffer 106.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/21113.000413&ELEMENT_SET=DECL (3596 words)

	Tooling & Production - Jan 2001 - Chapter 1: Cutting-Tool Materials (cont.)
		Most of the subsequent developments in the hard carbides have been modifications of the original patents, principally involving replacement of part or all of the tungsten carbide with other carbides, especially titanium carbide and/or tantalum carbide.
		The hardness of the carbide is greater than that of most other tool materials at room temperature, and it has the ability to retain it hardness at elevated temperatures to a greater degree, so that greater speeds can be adequately supported.
		Large amounts of tungsten carbide are present in all of the grades in the two cutting groups and cobalt is always used as the binder.
	www.manufacturingcenter.com /tooling/archives/0101/0101bk_a.asp (1384 words)

	Net molded tantalum carbide rocket nozzle throat - US Patent 6510694 (Site not responding. Last check: 2007-10-14)
		Nozzle throats made according to the invention have bodies made of refractory metals, such as tantalum, and ceramic coatings on the inner surfaces of the annular bodies, wherein the ceramic coatings are made of ceramic materials such as tantalum carbides (TaC and Ta Claims
		In particular, a nozzle throat is made by forging a ceramic layer to a tantalum metal ring at high temperatures and pressures.
		The refractory metal ring is further preferably made from a material selected from the group consisting of tantalum, tantalum alloys, molybdenum alloys, hafnium alloys, titanium alloys, tungsten alloys, and niobium alloys.
	www.patentstorm.us /patents/6510694.html (1906 words)

	It's Elemental - The Element Tantalum
		Tantalum was discovered by Anders Gustaf Ekenberg, a Swedish chemist, in 1802 in minerals obtained from Ytterby, Sweden.
		Tantalum is a strong, ductile metal that is nearly immune to chemical attack at room temperatures.
		Tantalum also does not irritate the body and is used to make surgical sutures as well as implants, such as artificial joints and cranial plates.
	education.jlab.org /itselemental/ele073.html (283 words)

	Tantalum (Site not responding. Last check: 2007-10-14)
		Tantalum is used to make a variety of alloys with desirable properties such as high melting point, high strength, good ductility, etc. Scientists at Los Alamos have produced a tantalum carbide graphite composite material, which is said to be one of the hardest materials ever made.
		Tantalum has a good "gettering" ability at high temperatures, and tantalum oxide films are stable and have good rectifying and dielectric properties.
		Tantalum is used to make electrolytic capacitors and vacuum furnace parts, which account for about 60% of its use.
	www.scescape.net /~woods/elements/tantalum.html (364 words)

	Tantalum (Site not responding. Last check: 2007-10-14)
		Tantalum is a shiny, grey, but ductile metal that resembles platinum.
		Tantalum is not readily attacked by chemicals and forms an oxide film on its surface.
		Tantalum occus in nature in the minerals columbite and tantalite (Col-tan) and euxenite.
	nobel.scas.bcit.ca /resource/ptable/ta.htm (313 words)

	Tantalum - Raw Materials and Processing
		The sale of tantalum mineral concentrates is based on a certified analysis for the tantalum oxide they contain, with a range from 10 or 15 to over 60% depending on the mine source.
		The extraction and refining of tantalum, including the separation from niobium in these various tantalum-containing mineral concentrates, is generally accomplished by treating the ores with a mixture of hydrofluoric and sulfuric acids at elevated temperatures.
		Tantalum metal powder is generally produced by the sodium reduction of the potassium tantalum fluoride in a molten salt system at high temperature.
	www.tanb.org /tantalum1.html (1122 words)

	Tooling & Production - Jan 99 - Cemented tungsten carbides
		When the carbide grain size is too small, and the binder percentage does not give the wear part enough ductility, the carbide grade may be too hard and lack enough shock resistance for the application.
		Carbide tools, dies, and wear parts should be designed so that loads are transmitted away from weak surfaces to stronger, larger structural areas.
		Carbide is made by means of powder metallurgy which distinctly minimizes, but does not entirely eliminate, the possibility of porosity.
	www.manufacturingcenter.com /tooling/archives/0199/199cmnt.asp (1870 words)

	tantalum1
		The brittleness of carbides however prevents its application as single-phase materials in highly stressed structural applications, which in turn led to the development of metal-bonded composites (cemented carbides or cermets).
		For group V carbides, however the large difference between the metal atom radii in the metal and in the carbide suggests that a model of metal /metal contact is less open structure, shown in Fig 1b,describes their structures.
		For all the Group IV carbide, the anisotropy factor is <1 while for stoichiometric TaC, it is >1,in accord with the model discussed in Fig 1 and proposed for the structures of these carbides.
	www.geocities.com /jobsarnab/tantalum1.html (1676 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Metal carbides and particularly the carbides of tantalum, hafnium, niobium, titanium, zirconium, tungsten and vanadium and mixtures thereof exhibit the desired characteristics of the required coating.
		The surface of claim 17 wherein said coating is a refractory metal compound selected from the group consisting of tantalum carbide, hafnium carbide, niobium carbide, titanium carbide, zirconium carbide, tungsten carbide and vanadium carbide; and tantalum nitride, hafnium nitride, niobium nitride, titanium nitride, zirconium nitride, tungsten nitride and vanadium nitride and mixtures thereof.
		A method according to claim 25 wherein the material for coating the graphite is selected from the group consisting of tantalum carbide, hafnium carbide, niobium carbide, titanium carbide, zirconium carbide, tungsten carbide and vanadium carbide; and tantalum nitride, hafnium nitride, niobium nitride, titanium nitride, zirconium nitride, tungsten nitride and vanadium nitride and mixtures thereof.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/27361.010419&ELEMENT_SET=DECL (5655 words)

	Just what is this Tantalum, anyway? (Site not responding. Last check: 2007-10-14)
		Tantalum oxide was also used to make camera lenses with a high index of refraction.
		Tantalum is used to make a variety of alloys with desirable properties, such as high melting point, hardness, or good ductility.
		Scientists at Los Alamos during that period produced a Tantalum carbide graphite composite which was then one of the hardest known, and had a melting point of 6,760 degrees F. Tantalum also has good "gettering" properties at high temperatures, and its oxide forms stable films with good rectifying and dielectric properties.
	home.earthlink.net /~ad2300/tantalum.htm (603 words)

	Periodic Table Elements
		Tantalum is also used in camera lenses because its oxide increases the refracting, or light bending, properties in glass.
		Tantalum is a shiny, gray, but ductile metal that resembles platinum.
		Tantalum occurs in nature in the minerals columbite and tantalite (Col-tan) and euxenite.
	www.mlms.logan.k12.ut.us /~mlowe/tantalum.htm (398 words)

	Cemented carbonitride alloys containing tantalum - Patent 4120719 (Site not responding. Last check: 2007-10-14)
		It has been found that the effects of tantalum are important and, in particular, tantalum serves to improve remarkably the thermal fatigue resistance that is the third disadvantage of the known cermets.
		In more detail, the effects of tantalum increase with the increase of the amount thereof, but, in view of that tantalum is an expensive element, the optimum range is between 40% and 60% by atomic ratio based on the total amount of tantalum, tungsten and molybdenum.
		In comparison of Alloys D to F in which a part or all of tantalum is incorporated in the form of the nitride, the wear resistance and cutting fatigue resistance increase with the increase of the Ta to (W + Mo + Ta) atomic ratio as apparent from Table 2 and Table 3.
	www.freepatentsonline.com /4120719.html (2017 words)

	Tantalum Carbide ( TaC ) — Supplier Data by Goodfellow
		Tantalum carbide has a metallic lustre, but may also be found as a dark to light brown powder.
		Tantalum carbide is often added to tungsten carbide/cobalt (WC/Co) powder attritions to enhance the physical properties of the sintered structure.
		Tantalum carbide is also used in the production of sharp instruments with extreme mechanical resistance and hardness.
	www.azom.com /details.asp?ArticleID=2308 (159 words)

	Tantalum (Site not responding. Last check: 2007-10-14)
		Tantalum is combined with cobalt, iron, and nickel in super-alloys for aerospace structures and jet engine parts.
		Tantalum is also combined with carbon as tantalum carbide and with other metals to use as metal-cutting tools, wear-resistant parts, and for boring tools.
		Tantalum and niobium are chemically similar and are often present in similar geologic environments.
	www.state.ar.us /agc/tantalum.htm (221 words)

	United States Patent Application: 0030062826
		The present invention is characterized in that nitride or carbide of a metal element belonging to one of Group 4, 5, and 6 in the periodic table (hereinafter referred to as metal compound) is used as the material for forming an anode of a light emitting element.
		This is supposedly because the anode material of the present invention is a compound such as nitride or carbide containing a metal (hereinafter referred to as metal compound) and nitrogen or carbon contained in the metal compound locally forms covalent bonds with carbon, oxygen, hydrogen, or nitrogen contained in the organic compound.
		Specifically, a conductive nitride, an oxide, a carbide, a boride, and a silicide that are composed of elements of fourth, fifth, or sixth group of the periodic system can be used.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/PTO/search-adv.html&r=1&f=G&l=50&d=PG01&p=1&S1=20030062826.PGNR.&OS=DN/20030062826&RS=DN/20030062826 (14331 words)

	Tantalum
		In fact, at temperatures below 150 °C tantalum is almost completely immune to chemical attack and can only be attacked by hydrofluoric acid, acidic solutions containing the fluoride ion, and free sulphur trioxide.
		Major end uses for tantalum capacitors include portable telephones, pagers, personal computers, and automotive electronics.
		It is ductile and can be drawn into fine wire, which is used as a filament for evaporating metals such as aluminum.
	www.brainyencyclopedia.com /encyclopedia/t/ta/tantalum.html (679 words)

	American Metal Market: Columbium alloy falters; price, quality swing away US toolmakers, but Europe still likes it
		For example, if 10-percent tantalum carbide were required in the making of a particular tool, Campbell said, and half of that 10 percent were replaced with hafnium-columbium, there would result no difference in the quality of the tool.
		Hantel said one factor is using tantalum carbide in the making of cutting tools was to give increased thermo shock and mechanical shock resistance to the work piece.
		Peters explained that tantalum is favored because of an increased used of coated carbide steel cutting grades, which are more advantageous for higher cutting speeds and withstanding higher temperatures.
	www.findarticles.com /p/articles/mi_m3MKT/is_v92/ai_3431411 (1074 words)

	Tantalum
		Tantalum pentoxide is used in capacitors and in camera lenses to increase refracting power.
		Several methods are used to commercially produce the element, including electrolysis of molten potassium fluorotantalate, recduction of potassium fluorotantalate with sodium, or reactng tantalum carbide with tantalum oxide.
		Tantalum is used to make a variety of alloys with desirable properties such as high melting point, high strength, good ductility, etc.
	www.corrosionsource.com /handbook/periodic/73.htm (386 words)

	Tantalum (Site not responding. Last check: 2007-10-14)
		Tantalum is named from the Greek Tantalos, the father of Niobe (mythology) and was discovered in 1802.
		Tantalum ores are found in the Republic of Zaire, Brazil, Mozambique, Thailand, Portugal, Nigeria and Canada.
		Tantalum is used to make a variety of alloys with desirable properties such as high melting point, high strength and good ductility.
	www.muhlenberg.edu /depts/chemistry/pertable/tantinfo.htm (181 words)

	Coated cemented carbide product - Patent 4018631
		Improved adherence of oxide coatings on cemented carbide substrate containing tungsten and cobalt is attained by forming on the substrate a coating selected from carbide, nitride, carbonitride and mixtures thereof, diffusing tungsten and cobalt from the substrate into the coating, oxidizing said coating, and coating said oxidized coating with oxide wear layer.
		Inserts of cemented carbide containing by weight 6 percent cobalt with the remainder tungsten carbide were precoated in the manner of Example 1 with a titanium carbide layer about 2-3 microns thick, the so pretreated inserts being then fired for 30 minutes at 1400.degree.
		Inserts of cemented carbide containing by weight 6 percent cobalt as a matrix with the remainder tungsten carbide were coated with about 3-5 micron thick layers of titanium carbide in the manner of Example 1, and treated for about 21/2 hours at 1250.degree.
	www.freepatentsonline.com /4018631.html (1793 words)

	Tantalum (Site not responding. Last check: 2007-10-14)
		Tantalum is almost completely immune to chemical attack at temperatures below 150 °C, and is attacked only by hydrofluoric acid, acidic solutions containing the fluoride ion, and free sulfur trioxide.
		The compound has a melting point of 3738 °C. Tantalum has good "gettering" ability at high temperatures, and tantalum oxide films are stable and have good rectifying and dielectric properties.
		Tantalum is completely immune to body liquids and is a nonirritating metal.
	www.sunysccc.edu /Academic/mst/ptable/ta.html (435 words)

	Encyclopedia: Tungsten
		The pure form is used mainly in electrical applications but its many compounds and alloys are widely used in many applications (most notably in light bulb filaments and in space-age superalloys).
		Cemented carbides (also called hardmetals) are wear-resistant materials used by the metalworking, mining, petroleum and construction industries.
		Tungsten Carbide has recently been used in the fashioning of jewelry due to its hypoallergenic nature and the fact that due to its extreme hardness it is not apt to lose its luster like other polished metals.
	www.nationmaster.com /encyclopedia/Tungsten (5816 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Cemented carbides and cermets are metal-bonded transition metal carbides (or carbonitrides) used for their properties of high strength, hardness, and thermal shock resistance.
		Tantalum carbide (TaC) and niobium carbide (NbC) are important components of cemented carbides and cermets used for metalcutting applications, primarily indexable inserts.
		After normalizing for the approximately 2:1 ratio in density between cemented carbides and cermets, the levels of Ta and Nb required for metalcutting cermets are of the same order as those used in metalcutting carbides.
	www.ctemag.com /article/viewArticle.asp?ARTICLE_ID=80 (2037 words)

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