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Yttrium - Wikipedia, the free encyclopedia Potentially, yttrium can be used in ceramic and glass formulas, since yttrium oxide has a high melting point and imparts shock resistance and low thermal expansion characteristics to glass. In 1843, a Swedish chemist by the name of Carl Mosander was able to show that yttria could be divided into the oxides (or earths) of three different elements. "Yttria" was the name used for the most basic one and the others were named erbia and terbia. www.wikipedia.org /wiki/Yttrium   (812 words)

Scandia-and-Yttria-Stabilized Zirconia for Thermal Barriers The longevity of such a coating depends upon yttria as a stabilizing additive that helps to maintain the zirconia in an yttria-rich, so-called "non-transformable" tetragonal crystallographic phase, thus preventing transformation to the monoclinic phase with an associated deleterious volume change. Of particular interest are scandia-and-yttria-stabilized zirconia (SYSZ) compositions of about 6 mole percent scandia and 1 mole percent yttria, which have been found to exhibit remarkable phase stability at a temperature of 1,400 °C in simple aging tests. 3.7 mole percent scandia and 3.0mole percent yttria. www.nasatech.com /Briefs/Oct03/LEW16789.html   (407 words)

Yttria Coated Mass Spectrometer Filaments Yttria and Thoria were electrophoretically deposited on the filament wires to a thickness of 0.0005". The Yttria coated filament (Filament #2) operated at measured filament voltage of 1.455 volts, which is about 70% of the voltage requirements for the non Yttria coated filament. Yttria coated filaments require less power than uncoated filaments and the filament operates at lower temperature to achieve the same emission as the uncoated filaments. www.sisweb.com /referenc/applnote/app-92.htm   (1331 words)

Scandia, yttria-stabilized zirconia for ultra-high temperature thermal barrier coatings - Patent 6044830 In describing the amounts of scandia and yttria in the thermal barrier coating, it is helpful, for comparison purposes, to give the relative amounts of scandia and yttria in the coating by expressing the amount of yttria or the amount of scandia as a percentage (by mole) of combined amount of scandia and yttria. Then, the combined amount of scandia and yttria is expressed as a percentage (by mole) of the total composition of the coating (that is, of the combined amount of scandia, yttria and zirconia). Alternatively, the scandia, yttria- stabilized zirconia ceramic may be formed by combining acid solutions of scandia and yttria, (for example, scandia and yttria dissolved in HCI), with a zirconia salt (for example, ZrOCl.sub.2), neutralizing the solution (with, for example, NH.sub.4 OH) to precipitate the mixed oxide ceramic precursor and then recovering the precipitate. freepatentsonline.com /6044830.html   (3777 words)

Transparent yttria ceramics and method for producing same - Patent 4147744 A process as defined in claim 1 wherein the lanthana and yttria precursors are selected from the group consisting of co-precipitated oxalates, carbonates, hydroxides, and organic carboxylates. The transparent yttria doped with lanthana in accordance with the present invention can be obtained by combining lanthana with yttria in a concentration of from about 6 to 14 mole ercent and preferably from about 8 to about 11 mole percent. For example, instead of dissolving the oxides of yttria and lanthana and co-precipitating to obtain the solid solution, yttria and lanthana or precursors of these compounds can be admixed by blending the dry powders. www.freepatentsonline.com /4147744.html   (1738 words)

39 Yttrium They were all obtained, however, by elaborate and laborious fractionation of two mixtures, the "yttria" of Gadolin and the "ceria" of Klaproth, Berzelius, and Hisinger, originally believed by their discoverers to be pure oxides. In the decades after Antoine Lavoisier developed the new chemistry built on the concept that earths could be reduced to their elements, the discovery of a new earth (with name ending in "a") was regarded as equivalent to discovering the element within. However, yttria was in fact it was a mixture of a number of metal oxides. www.vanderkrogt.net /elements/elem/y.html   (641 words)

MicroXRD YSZ Coating Redistribution of yttria in the coating from the tetragonal (t) phase to a low-yttria monoclinic (m) phase and a high-yttria cubic (c) phase is thought to contribute to the failure. The lattice parameters of each phase are used to track the redistribution of yttria, but the challenging nature of the analysis raises doubts as to the accuracy of the results. Results and Future Plans: The distribution of yttria and the resulting phase compositions are dependent upon the choice of feedstock powders used in the preparation of the coatings. www.cstl.nist.gov /div837/Division/techac/2000/mXRDCoatingYSZ.htm   (493 words)

all-around-new-books.de > GALERIE > KINDER & JUGEND > MALCOLM ROSE > LAB 47. GEFAHR AUS DEM LABOR Der junge Chemiker Kyle Proctor arbeitet seit kurzem für den Pharmakonzern Yttria. Yttria forscht vorgeblich nach einem Mittel gegen die schlimme Krankheit der Sichelzellenanämie, die nur bei Farbigen auftritt und an der jeder vierte von ihnen leidet. Und Yttria macht geheime Geschäfte mit wohlhabenden und einflußreichen Rassisten in Südafrika... www.lese-magazin.de /galerie/kids/jugend/lab47.shtml   (784 words)

yttrium Yttria, which is an earth containing yttrium, was discovered by Gadolin in 1794. In 1843 Mosander showed that yttria could be resolved into the oxides (or earths) of three elements. The name yttria was reserved for the most basic one; the others were named erbia and terbia. www.speclab.com /elements/yttrium.htm   (504 words)

Lower-Conductivity Thermal-Barrier Coatings Like yttria, the A and B oxides are regarded as stabilizers. Preferably, the total stabilizer content (yttria + A oxide + B oxide) should lie between 4 and 50 atomic percent. The concentration of yttria should exceed that of each of other stabilizers, and the concentrations of the A and B oxides should be approximately equal. www.nasatech.com /Briefs/June03/LEW17039.html   (487 words)

CERAC, inc. - Yttrium Oxide, Y2O3 for Optical Coating Yttria can be used in combination with silicon dioxide layers to form a high index-contrast structure and also with higher index materials such as titania (TiO Yttria films are absorption-free over the range 300 nm to at least 11 µm. Yttria exhibits no reststrahlen bands below 18 µm, and therefore does not produce reflection loss at large incidence angles seen with silicon oxides and alumina. www.cerac.com /pubs/proddata/y2o3.htm   (640 words)

yttrium - HighBeam Encyclopedia   (Site not responding. Last check: 2007-10-24) The largest use of the element is as its oxide yttria, Y In 1794, Johan Gadolin isolated impure yttria from the mineral gadolinite. In 1843, C. Mosander isolated pure yttria as well as two impure fractions that he called erbia and terbia. www.encyclopedia.com /html/y1/yttrium.asp   (271 words)

Yttria ), also known as yttria, is a rare-earth oxide with excellent high temperature stability in contact with molten metals such as titanium. Additional beneficial properties of yttria include stability in plasma processing environments experienced during semiconductor device processing. CTC is one of the world's leading suppliers of yttria components including combustion tubes, crucibles, and plates. www.customtechceramics.com /y2o3.html   (129 words)

Bayard-Alpert UHV Gauge Heads and Leads   (Site not responding. Last check: 2007-10-24) Yttria is a safe and equivalent alternative to the toxic and radioactive thoria formerly used. Yttria has similar properties and runs less than 50C hotter in normal emission. Yttria also has better adhesion and consequently longer life. www.vacuumtechnical.com /AML/bagau.html   (587 words)

Method of making an electrode - Patent 4597170 A method according to claim 3 wherein said stabilized zirconia is yttria stabilized zirconia. The zirconia may be stabilized with a number of elements, as is well known in the art, but yttria stabilized zirconia is preferred as it has excellent oxygen ion mobility. Microscopic examination of the electrode showed that a skeleton of yttria stabilized zirconia had grown between the nickel particles, bonding them to the electrolyte, as is illustrated in FIG. www.freepatentsonline.com /4597170.html   (2543 words)

CERAFLEX ultra thin zirconia for fuel cells and electronics CERAFLEX is a yttria stabilized, ultra thin, tough, flexible zirconia ceramic material in thin sheet form. For use in solid oxide fuel cells, oxygen sensors, and applicaions requiring high oxygen ion conductivity, fully stabilized 8 mole % yttria is used. These are unfired thin sheets of zirconia fully stabilized with yttria and are ready for your normal processing. www.mkt-intl.com /electrochem/pages/cereflex.html   (390 words)

American Elements: Yttria Stabilized Zirconia Supplier & Tech Info Yttria Stabilized Zirconia is available both partially and fully stabilized. Yttrium has the highest thermo-dynamic affinity for oxygen, useful in ceramics for crucibles for molten reactive metals, in florescent phosphors, computer displays and automotive fuel sensors. Yttria stabilized zirconia is used in high temperature applications and as an electrolyte in fuel cells. www.americanelements.com /ysz.html   (129 words)

Zirconia (Zirconium Oxide) and Partially Stabilized Zirconia Calcia Stabilized Zirconia Magnesia Stabilized Zirconia Yttria Stabilized Zirconia In order to achieve the requirement of the presence of cubic and tetragonal phases in their microstructure, stabilizers (magnesia, calcia, or yttria) must to be introduced into pure zirconia powders prior to sintering. Zirconium Oxide (Zirconia) Calcia Stabilized Zirconia Magnesia Stabilized Zirconia Yttria Stabilized Zirconia Zirconyl Chloride www.stanfordmaterials.com /zr.html   (1769 words)

Yttria Information Center - yttria stabilized zirconia coating Yttrium oxide is an oxide kroger vink notation yttria yttria coating of yttrium. Its chemical yb doped yttria formula is yttria crucible Y It can also be used as a catalyst for ethylene polymerization. www.scipeeps.com /Sci-Chemistry_Topics_W_-_Z/Yttria.html   (163 words)

On the Development of a Nanocrystalline Yttria Stabilised Zirconia Ceramic ... On the Development of a Nanocrystalline Yttria Stabilised Zirconia Ceramic... In this study, an attempt was made to develop a nanocrystalline 5 mol.% yttria partially stabilised zirconia ceramic (5Y-PSZ) capable of exhibiting superplastic flow at relatively lower temperatures. A physical vapour processing route was used to synthesise the powders which was consolidated and subjected to a pressureless sintering route. www.x-cd.com /nano2004/html/prof325.html   (213 words)

Cerbec ceramic bearing balls | materials Both Magnesia and Yttria based silicon nitrides are highly inert in most liquids and gases. In general, Magnesia and Yttria based silicon nitrides behave the same in various environments. For example, Yttria based silicon nitrides are more resistant to hydrofluoric (HF) acid solutions than Magnesia based silicon nitrides, however factors such as the part size, geometry, and surface finish, as well as the concentration of the HF. www.cerbec.com /TechInfo/Materials3.asp   (374 words)

Zircar Zirconia, Inc. - Product Announcements | Product News   (Site not responding. Last check: 2007-10-24) The high purity yttria stablized zirconia chemistry is inert in even the most corrosive environments. Zirconia Cloths Type ZYW are flexible textiles composed of yttria stabilized zirconia fibers that offer high temperature and chemical resistance. Zirconia Bulk Fibers Type ZYBF are yttria stabilized zirconia fibers available in five different forms, all having useful properties up to 2200 Celsius. www.globalspec.com /Supplier/ProductAnnouncements/ZircarZirconia   (829 words)

Small Times: News about MEMS, Nanotechnology and Microsystems Nanomaterials offer one or more properties that don’t exist in bulk material, whether that is increased strength, novel optical characteristics or magnetism, said Richard Schorr, president of MetaMateria Partners in Columbus, Ohio. Windows made of conventional yttria tend to crack in flight conditions. MetaMateria is trying to strengthen the windows using a process that packs nanograins of yttria as closely as possible. www.smalltimes.com /document_display.cfm?document_id=8193   (695 words)

Welcome to Saint-Gobain Ceramics - - - Zirconia   (Site not responding. Last check: 2007-10-24) Zirconia based, sintered refractories are well known for very high service temperature limit and outstanding high temperature chemical inertness. Our range of bricks and shapes is based on proprietary fused zirconia grains, either Lime stabilized or Yttria stabilized. Yttria stabilized materials are more chemically inert and more heat resistant than lime stabilized formulations. www.refractories.saint-gobain.com /Data/Element/Node/Category/Category_edit.asp?ele_ch_id=C0000000000000001042   (102 words)

zirconia ceramic:zirconium oxide:advanced ceramics AmZirOx 86 AmZirOx 86 zirconia (Astro Met Zirconium Oxide) is a yttria stabilized zirconia ceramic material which features high strength and toughness making it a candidate material for use in severe structural applications which exhibit wear, corrosion, abrasion and impact. This material is also commonly referred to as Y-TZP or Yttria Tetragonal Zirconia Polycrystal. AmZirOx 86 zirconia has been developed with a unique micro structure utilizing transformation toughening which allows AmZirOx 86 zirconia to absorb the energy of impacts that would cause most ceramics to fail. www.astromet.com /zirconia-amzirox86.htm   (108 words)

Yttria stabilised zirconia Yttria Stabilized Zirconia Bulk Ceramic Fibres (ZrO2) Type ZYBF from Zircar Zirconia Zircar Zirconia Bulk Fibers Type ZYBF are yttria stabilized zirconia fibers available in five different forms with useful properties up to 2200°C. These ceramic fibers can be vacuum formed into rigid shapes, placed into cavities as loose fill insulation, or added to ceramic bodies and coatings for r Applications for these materials are outlined as are other materials that can be produced using the Zircar Process. azom.com /SearchResults.asp?MaterialKeyWord=Yttria+stabilised+zirconia   (443 words)

Zirconium Oxides - UK (England, Scotland, Wales, Northern Ireland)   (Site not responding. Last check: 2007-10-24) Magnesia and Yttria stabilised zirconia can be spray dried. Zirconium oxides are used worldwide for thermal spray, engineering ceramics, structural ceramics, electro ceramics and ceramic pigments. Yttria stabilised zirconia is used for the thermal spray and structural ceramics. www.kellysearch.co.uk /gb-product-106058.html   (391 words)

58 Cerium Vilhelm Hisinger (1766-1852) belonging to the family owning the Bastnäs mine, sent at the age of 15 samples of this tungsten (Swedish for "heavy stone") from this mine to Carl Scheele who found nothing new. In 1803 Vilhelm Hisinger, now ironmaster, together with Jöns Jakob Berzelius (1779-1848) reinvestigated cerite, as the "heavy stone of Bastnäs" later was named, expecting to find yttria, the new earth which was six years before discovered by Johan Gadolin in a dense fl mineral (cf. They isolated an earth similar to yttria but recognized it was distinct. elements.vanderkrogt.net /elem/ce.html   (686 words)

Single-Crystal Elastic Constants of Yttria (Y2O3)   (Site not responding. Last check: 2007-10-24) Single crystals of yttria have been grown successfully at the NASA Glenn Research Center using a laser-heated float zone technique in a fiber and rod. They also yield information as to what degree the elastic properties of yttria ceramics are a result of the intrinsic properties of the yttria crystal in comparison to characteristics that may depend on processing, such as microstructure and intergranular phases, which are common in sintered yttria. The single-crystal elastic moduli of yttria were measured by Brillouin spectroscopy up to 1200 °C. The room-temperature values obtained were C www.grc.nasa.gov /WWW/RT2001/5000/5130sayir.html   (300 words)

Altair Awarded Patent For Its Process to Manufacture Nano-Sized Yttria Stabilized Zirconia, Patent, Altair ... Altair's YSZ is the ideal material for use in manufacturing solid oxide fuel cells (SOFC) as the company's patented process allows particle size to be selected. The goal of the company is not to manufacture fuel cells, but prototypes that showcase the company's commercial nanomaterials. Innovators in medical devices, clinical practice, and biomedical research will gather at Cleveland Clinic Oct. 2-5 to discuss the latest materials advances and nanotechnology discoveries and how they are resulting in new medical applications. www.nanotechwire.com /news.asp?nid=525   (749 words)

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