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Topic: Noble metal


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In the News (Wed 22 May 19)

  
  Noble metal - Wikipedia, the free encyclopedia
Noble metals are metals that are resistant to corrosion or oxidation, unlike most base metals.
Alchemists were concerned with the transmutation of base metals into gold (a noble metal) for economic gain, or as a metaphor for more esoteric processes.
In this sense of the word, graphite is more noble than silver (even though it is alchemically more base) and the relative nobility of many materials is highly dependent upon context, as for aluminium and stainless steel in conditions of varying pH.
en.wikipedia.org /wiki/Noble_metal   (372 words)

  
 [No title]   (Site not responding. Last check: 2007-10-09)
It has now been discovered that composite wire having a non-noble metal core of consistent diameter with a noble metal layer of uniform thickness firmly adhered thereto may be economically produced by forming the noble metal layer on a non-noble metal core before the wire is drawn.
The present invention provides a method by which a non-noble metal wire may first be coated with a noble metal and then drawn to micron dimensions rather than attempting to form a layer of noble metal on a micron-dimensioned wire.
(Noble metals are defined as metals that do not oxidize by heating in air, and, in addition to gold, include platinum, palladium, silver and the like.) R represents the radius of the wire 10 formed by the core 12 and annulus 14, while r represents the radius of core 12.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/15429.010712&ELEMENT_SET=DECL   (3397 words)

  
 Capacitor with noble metal electrodes - Patent 4075681
Performance normally requires the use of the noble metals, due to their relative inertness during firing on dielectric substrates to produce electrically continuous conductors, since base metals often are oxidized in air at elevated temperatures and/or react with the dielectric substrate during firing.
Generally, the metallizations are such that at least 90% of the noble metal and of the additive oxide particles are no greater than 5 microns in diameter (that is, their largest dimension for irregularly shaped particles).
The ratio of inert liquid vehicle to solids in the metallizing compositions of this invention may vary considerably and depends upon the manner in which the dispersion of metallizing composition in vehicle is to be applied and the kind of vehicle used.
www.freepatentsonline.com /4075681.html   (3455 words)

  
 Noble metal-chromium alloy catalysts and electrochemical cell - Patent 4316944
A novel and improved noble metal-chromium alloy catalyst is disclosed with catalytic oxygen reduction activity at least twice that of the unalloyed noble metal.
As used herein, "noble metals" refers to those metals of the second and third triads of group VIII of the Periodic Table, also referred to as the palladium and platinum groups respectively.
The present invention is directed to a noble metal-chromium alloy catalyst with catalytic activity for oxygen reduction at least twice that of the unalloyed noble metal.
www.freepatentsonline.com /4316944.html   (2762 words)

  
 Noble - Wikipedia, the free encyclopedia
Noble gas, chemical elements in group 18 (old-style Group 0) of the periodic table
Noble metal, metals that are resistant to corrosion or oxidation
NOBLE, an acronym for North of Boston Library Exchange, a cooperative effort of 28 libraries
en.wikipedia.org /wiki/Noble   (231 words)

  
 Caring for Your Metal Objects
Metals are produced from ores that are found in nature and are processed, or smelted, from a stable mineral state to a less stable metallic state.
Metals are also often layered together as in the case of silver plated on a base metal substrate or tin plated on an iron substrate.
Metal objects should always be handled with clean, white, cotton gloves, or nitrile or vinyl gloves with a pair of cotton gloves over them to further prevent sweat from passing through to the object.
aic.stanford.edu /library/online/brochures/metals.html   (1640 words)

  
 Reliability Center, Inc. - Metal Corrosion Basics   (Site not responding. Last check: 2007-10-09)
Metal corrosion is a chemical reaction between a metal surface and its environment.
Where a less noble (base, anodic) metal has to be in contact with a noble metal make sure the less noble metal has at least one hundred times more surface area than the noble metal.
Another technique is to use corrosion inhibitors that combine with the corroding metal (anode) or the protected metal (cathode) to form a barrier layer that reduces the flow of ions and electrons across it to very low values and virtually stops the corrosion.
www.reliability.com /articles/guest_article03.htm   (2573 words)

  
 United States Patent Application: 0040142230
The conductive catalytic particles are produced by causing the noble metal material and the additive material or MI and MII to adhere at the same time to the surface of a conductive powder by physical vapor deposition.
The process for producing conductive catalytic particles as defined in claim 32, which comprises causing the noble metal material and the additive material to adhere to the surface of the conductive powder by the physical vapor deposition, while vibrating the conductive powder together with vibration-amplifying means.
Thus, the process yields the conductive catalytic particles having the catalytic material (which is an alloy of the noble metal material and the additive material) adhering to the surface of the conductive powder.
appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040142230".PGNR.&OS=DN/20040142230&RS=DN/20040142230   (14321 words)

  
 SGTE noble metals database - documentation   (Site not responding. Last check: 2007-10-09)
The evaluated parameters in the Noble Metal Alloys Database are based on data collected from publications and internal project reports or have been assessed as part of the development of the database.
Noble metals and their alloys have a wide variety of applications, and calculations of relevant phase equilibria in a particular case are important e.g.
The database will often be used with one of the noble metals as major component, but in a number of applications, large concentrations of alloying elements are present.
www.crct.polymtl.ca /fact/documentation/FSnobl/FSnobl_documentation.htm   (1733 words)

  
 Dental Noble Metal Alloys - Class II Special Controls Guidance Document:   (Site not responding. Last check: 2007-10-09)
A noble metal alloy is a device composed primarily of noble metals, such as gold, palladium, platinum, or silver, that is intended for use in the fabrication of cast or porcelain-fused-to metal crown and bridge restorations.
The special control for this device is the FDA’s “Class II Special Controls Guidance Document: Dental Noble Metal Alloys; Guidance for Industry and FDA.” The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in §872.9.
A dental noble metal alloys may be primarily composed of gold, silver, platinum, or palladium, with lesser amounts of other elements such as copper and zinc.
www.fda.gov /cdrh/ode/guidance/1415.html   (1601 words)

  
 CT 3/99: Designing sulfur-resistant, noble-metal hydrotreating catalysts
Although noble metals are hydrogenation active at low temperatures, their use as catalysts will become attractive only if their sulfur resistance can be greatly enhanced.
Catalysts A and B in Figure 1 are metal sulfide catalysts such as sulfided Ni-Mo. Catalyst C is noble metal loaded on an acidic support.
The higher activity of the former may be attributable partly to the better metal dispersion on zeolites and partly to the electron deficiency of metals supported on acidic materials.
pubs.acs.org /hotartcl/chemtech/99/mar/sulfur.html   (2518 words)

  
 Joints of dissimilar metals and noble metal table   (Site not responding. Last check: 2007-10-09)
Most metals today are not perfectly pure and consequently, when exposed to the environment, will begin to exhibit some of the effects of corrosion.
This is the accelerated corrosion (loss) of the least noble metal (anode) while protecting the more noble (cathode) metal.
As the joint pressure is increased, the embedded particles dig into the metals and form a virgin low resistance junction void of air and its moisture.
www.comm-omni.com /polyweb/dissimilarmetals.htm   (724 words)

  
 noble metal --¬† Encyclop√¶dia Britannica
In general, the metal carbonyls are produced by direct action of carbon monoxide on the finely divided metal.
When an active metal such as sodium is placed in contact with liquid water, a violent exothermic (heat-producing) reaction occurs that releases flaming hydrogen gas.2Na(s) + 2HThis is an example of an oxidation-reduction reaction, which is a reaction in which electrons are transferred from one atom to another.
The luxurious life of the pharaoh and the nobles was made possible by the continual labor of the peasants who tilled the soil.
www.britannica.com /eb/article-9056014   (724 words)

  
 Noble metal gas barriers patent   (Site not responding. Last check: 2007-10-09)
In particular, it relates to means to control the diffusion and reaction of oxygen and hydrogen gas within noble metal metallic barrier structures and prevent barrier damage.
In general, pure metals and alloys that resist oxidation damage do so by forming an adherent oxide layer that is a barrier to further oxygen attack.
Jaffrey eliminates chromium by using noble metal conductors between the cathode and anode sides of a nonconductive bipolar separator to form the electrical interconnection.
www.freshpatents.com /Noble-metal-gas-barriers-dt20050505ptan20050092175.php   (2185 words)

  
 Sherer Dental Lab   (Site not responding. Last check: 2007-10-09)
Abutment supported porcelain fused to metal crown (noble metal) - A single metal-ceramic crown restoration that is retained, supported and stabilized by an abutment on an implant; may be screw retained or cemented.
Implant supported metal crown (titanium, titanium alloy, high noble metal) - A single cast metal crown restoration that is retained, supported and stabilized by an abutment on an implant; may be screw retained or cemented.
Abutment supported retainer for cast metal FPD (noble metal) - A cast metal retainer for a fixed partial denture that gains retention, support and stability from an abutment on an implant; may be screw retained or cemented.
www.shererdentallab.com /clients/insurance_codes.asp   (2257 words)

  
 (WO 2004/071548) METAL STENT WITH SURFACE LAYER OF NOBLE METAL OXIDE AND METHOD OF FABRICATION   (Site not responding. Last check: 2007-10-09)
In one embodiment of the process, the interface region is established by forming the surface of pure noble metal and negligible oxide thereof in direct contact with the metal or alloy of the substrate surface.
In another, the interface region is established by first creating an oxide of the substrate metal or alloy thereof at the substrate surface, and then forming the noble metal oxide layer as above, but in contact with the substrate metal of alloy oxide.
Alternatively, the noble metal oxide layer has no progressively varying concentration but simply overlies an oxide of the substrate metal or alloy.
www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=04/71548.040826   (215 words)

  
 PMR: Ethanol Reactions over the Surfaces of Noble Metal/Cerium Oxide Catalysts
Catalysis by noble metals is usually achieved via the high dispersion of low loading metal(s) (less than one atomic per cent) on an appropriate support.
The addition of Rh metal largely suppressing the dehydrogenation route is most likely due to the formation of a bicoordinated species (via the O and the C ends: oxametallacycle).
The complexity of the ethanol reactions on the surfaces of noble metals/cerium oxide catalysts is outlined.
www.platinummetalsreview.com /dynamic/article/view/48-3-105-115   (3141 words)

  
 Noble International, Ltd.
Noble International, LTD. announced today Thomas A. Saeli's appointment as Chief Executive Officer.
Saeli brings to Noble many years of executive experience in the automotive industry and international markets.
Noble accepts resumes in our front lobby during regular business hours for open positions.
www.nobleintl.com /contact.asp   (108 words)

  
 Premier Dentist Handbook - Prosthodontics, Fixed (06000 – 06999)   (Site not responding. Last check: 2007-10-09)
Noble: Noble metal content equal to or greater than 60% (gold, platinum, palladium) and gold equal to or greater than 40%.
High Noble: Noble metal content equal to or greater than 25% (gold, platinum, palladium).
Onlay – metallic per tooth in addition to inlay.
www.premierppo.com /dh_prosfixprocs.htm   (1526 words)

  
 Platinum - The Noble Metal
Platinum is often referred to as the 'noble metal'.
The noble metal averaged US$845 a troy ounce in 2004, the highest average annual price since 1980 and also up 22% from the average in 2003 of $691/oz.
The metal ratios in the eastern Bushveld also have more palladium and less platinum and base metals than those in the western Bushveld, where historically the majority of the mining has taken place.
www.gold-eagle.com /editorials_05/struthers020905.html   (1317 words)

  
 Gold, the Noble Metal   (Site not responding. Last check: 2007-10-09)
It was said to have been mined in the East Desert and Nubia by thousands of unfortunate slaves that would have worked in the intense heat with rationed water and food.
Gold is an excellent metal for jewelry because it is very workable (malleable) and extremely resistant to oxidation and corrosion.
It is called the "noble" metal because it does not react to any of the ordinary alkalines, acids or natural reagents that may be present nearby in its surrounding rock.
www.created-uniques.com /history/gold.htm   (338 words)

  
 Noble Metal
Noble Metal : Chemically inactive metal such as gold; does not corrode easily.
Adhesive bonding of noble metal alloys with a triazine dithiol...
US 6827620 B1 Method of manufacturing spark plug with noble metal...
www.mongabay.com /reference/environment/Noble_Metal.html   (208 words)

  
 Hydrogen and Fuel Cell Cars Business :: H2CARSBIZ HydrogenSource Demonstrates New Noble Metal Water Gas Shift Catalysts ...   (Site not responding. Last check: 2007-10-09)
Fuel processing is one of the most economical and convenient approaches to convert hydrocarbon fuels, as well as oxygenates like ethanol, to hydrogen either to power fuel cells or for other hydrogen applications.
HydrogenSource evaluated new generation, proprietary noble metal water gas shift catalysts under a joint development agreement with Sud-Chemie Inc. and United Technologies Research Center.
Endurance data shows that the noble metal WGS reactors will be very compact and cost competitive compared to base metal reactors, being 10 times smaller with a similar cost for a same capacity unit.
www.h2cars.biz /artman/publish/printer_408.shtml   (453 words)

  
 ZIRCAR Ceramics: NMTC
ZIRCAR Noble Metal Thermocouples assemblies consist of platinum/rhodium alloy wire (0.20in.dia.) installed in a high alumina insulator and protective tubes with a dense alumina terminal block.
These noble metals and their alloys are the most reliable sensing elements for the high temperature range shown.
They have exceptional resistance to corrosion and stability in calibration; however, hydrogen, carbon and many metal vapors can contaminate a platinum/rhodium thermocouple.
www.zircarceramics.com /pages/furnacc/specs/thermcpl.htm   (461 words)

  
 Gold - the Noble Metal
Gold is a rare, noble metal, with the chemical symbol Au, derived from Aurora or dawn.
Pure gold is 24 carat (or 1,000 fine), and because pure gold is soft and liable to wear, it is often alloyed with other metals.
The metal’s ability to reflect heat protects astronauts, satellites and critical electronic components from damage by hazardous x-rays and solar radiation found in space.
www.marthamine.co.nz /gold_noble.html   (921 words)

  
 Platinum Noble Metal, and Hydrogen   (Site not responding. Last check: 2007-10-09)
The Group 18 gases: He, Ne, Ar, Kr, Xe, and Rn are called "noble" gases but Xe forms a number of relatively stable compounds as does Kr.
The metals Ir, Pt, and Au are sometimes referred to as "noble" but that is only a relative term compared to other metals.
Each of these metals undergoes many chemical reactions -- just not quite so readily as other metals.
www.newton.dep.anl.gov /askasci/chem03/chem03592.htm   (158 words)

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