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Topic: Flux (metallurgy)


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  Flux (disambiguation) - Wikipedia, the free encyclopedia
Flux is a scientific term describing the rate of flow of something through a surface
Flux (metallurgy), is a material that aids in smelting and soldering by assisting the flow of the molten metal
Flux (magazine) is a magazine published in the United Kingdom.
en.wikipedia.org /wiki/Flux_(disambiguation)   (226 words)

  
 Resources   (Site not responding. Last check: 2007-09-07)
Metallurgy, science and technology of metals, includes the extraction of metals from ores, the preparation of metals for use, and the study of the relationship between structures and properties of metals.
Metallurgy is the study of crystalline structure of metals and alloys and relationship of this structure to the physical properties of metals and microscopic examination of suitably prepared specimens.
Metallurgy is the branch of science which deals with the general relationship of between the composition, structure and properties of metals and alloys, as well as the changes brought about by thermal, chemical, and metallurgical treatment.
www.bspyromatic.com /resources_science_of_metallurgy.html   (1254 words)

  
 Flux (metallurgy) - Wikipedia, the free encyclopedia
Common fluxes are: ammonium chloride or rosin for soldering tin; hydrochloric acid and zinc chloride for soldering galvanized iron (and other zinc surfaces); and borax for brazing.
In soldering of metals, flux serves a threefold purpose: it removes oxidation from the surfaces to be soldered, it seals out air thus preventing further oxidation, and by facilitating amalgamation improves wetting characteristics of the liquid solder.
The flux most commonly used in iron and steel furnaces is limestone, which is charged in the proper proportions with the iron and fuel.
en.wikipedia.org /wiki/Flux_(metallurgy)   (421 words)

  
 Flux - Wikipedia, the free encyclopedia
Stokes theorem states that the flux of the curl of a vector field is the path integral of the vector field over this boundary.
Except in the case of active transport, net flux is directly proportional to the concentration difference across the membrane, the surface area of the membrane, and the membrane permeability constant.
In ecology, flux is often considered at the ecosystem level - for instance, accurate determination of carbon fluxes (at a regional and global level) is essential for modeling the causes and consequences of global warming.
www.sciencedaily.com /encyclopedia/flux   (1571 words)

  
 METALLURGY - LoveToKnow Article on METALLURGY   (Site not responding. Last check: 2007-09-07)
To avoid this, the ore as it goes into the furnace is mixed with fluxes so selected as to convert the gangue into a fusible, slag, which readily runs down through the fuel with the regulus and separates from the latter.
Slags are not a necessary evil; if an ore were free from gangue we should add gangue and flux from without to produce a slag, because one of its functions is to form a layer on the regulus which protects it against the further action of the blast or furnace gases.
Fluxes may be arranged under the three heads of (I) fluor-spar, (2) basic fluxes and (3) acid fluxes.
65.1911encyclopedia.org /M/ME/METALLURGY.htm   (3501 words)

  
 Wikinfo | Flux   (Site not responding. Last check: 2007-09-07)
Flux is the flow that occurs as a result of a potential difference.
Flux is a quantity proportional to the surface integral of the normal (perpendicular) force field intensity over a given surface.
Flux is an aid to melting, a material which by its chemical action facilitates soldering or brazing of metals.
www.wikinfo.org /wiki.php?title=Flux   (447 words)

  
 Metallurgy
Metallurgy is the science of extracting metals from their ores.
Modern metallurgical research is concerned with the preparation of radioactive metals, with obtaining metals economically from low-grade ores, with obtaining and refining rare metals hitherto not used, and with the formulation of alloys.
The flux used depends upon the chemical nature of the ore; limestone is usually employed with a siliceous gangue.
www.crystalinks.com /metallurgy.html   (1528 words)

  
 [No title]   (Site not responding. Last check: 2007-09-07)
An under bump metallurgy layer 36 is formed on the passivation layer to provide a connection between the solder bump and the contact pad 34 and to provide a plating electrode, as shown in Figure 2.
Because the flux is not a consideration during the heating step, the step of forming the intermetallic region can be accomplished by heating the solder to a temperature significantly higher than the liquidus temperature of the solder thus reducing the time required to completely form the intermetallic region.
An under bump metallurgy layer 56 and a photoresist mask layer 60 are formed on the passivation layer 52 and the contact pad 54, as shown in Figures 14 and 20.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=98/22979.980528&ELEMENT_SET=DECL   (7004 words)

  
 Flux, metallurgy
In metallurgy, flux is an aid to melting, a material which by its chemical action facilitates soldering or brazing of metals.
Some common fluxes are ammonium chloride or rosin, for soldering tin; hydrochloric acid and zinc chloride for galvanized iron and other zinc surfaces; and borax, for brazing.
In soldering of metals, flux has a double purpose: it removes oxidation from the surfaces to be soldered, and by facilitating amalgamation improves wetting characteristics of the liquid solder.
www.mig-welders-tig-welder.com /welding-encyclopedia/flux.htm   (221 words)

  
 Metallurgy
It is a mixture of carbonate of potassa and charcoal.
The ore thus prepared is to be mixed with 3 parts of fl flux, and a little decrepitated sea-salt; put the mixture in a lined crucible, cover it and place it in a forge-fire, or in a hot furnace, for this ore is very difficult of fusion.
This consists in the skilful bundling of the iron to be welded, in the use of an extraordinarily large forgehammer, in employing a bulling-furnace, instead of a hollowfire or chafery, and in passing the iron, reduced to a melting heat, through grooved mill rollers of different shapes and sizes, as required.
www.sharelynx.net /web/cyclopedia/metallurgy.html   (18099 words)

  
 Metallurgy   (Site not responding. Last check: 2007-09-07)
In electric arc furnaces, scrap iron and steel, scrap substitutes such as DRI and HBI, pig iron, iron ore, and beneficiated iron ore are placed in a furnace and melted by the use of heat from an electric current.
Although steel plants flux with high calcium quicklime, most of the basic oxygen plants substitute or add 30 to 50% dolomitic (high magnesium) quicklime because experience has shown that this extends the refractory lining life of the furnaces.
Substantial quantities of quicklime are used as a flux in the manufacture of low carbon and ferro chromes.
www.lime.org /ENV02/Metal802.htm   (1229 words)

  
 Grading and Excavation Contractor | Metallurgy & Welding 101
There is no flux material placed in the core; thus, the weld area has to be protected by an inert gas or some other means.
The flux protects the molten weld from the atmosphere during welding and, upon cooling and hardening, forms a shiny surface, enhancing the weld’s appearance.
A granular flux having the texture and appearance of kitty litter is either spread by hand, gravity-fed, or carried in a compressed airstream over the weld pool, forming a protective blanket.
www.forester.net /gx_0011_metallurgy.html   (4892 words)

  
 Advanced Packaging - The influence of PCB parameters on CSP assembly and reliability
In the case of high-bump coplanarity, the flux may not coat the shortest bump tip sufficiently and may be unable to remove all the oxides during reflow.
Fluxes: Because the application of flux may be appropriate for CSP assembly or rework, important flux characteristics, including viscosity, flux residue, and solids content, should be investigated.
The solder bump metallurgy of the BGAs typically is either collapsible with eutectic (or near eutectic) composition or non-collapsible with high-lead (Sn/Pb 10/90) composition.
ap.pennnet.com /Articles/Article_Display.cfm?Article_ID=81242&CFID=3145092&CFTOKEN=90705173   (7495 words)

  
 flux --  Britannica Concise Encyclopedia - The online encyclopedia you can trust!
In metallurgy, any substance introduced in the smelting of ores to promote fluidity and to remove objectionable impurities in the form of slag.
In soldering, the flux removes oxide films, promotes wetting, and prevents reoxidation of the surfaces during heating.
Rosin is widely used as a noncorrosive flux when electronic equipment is soldered; in other applications, a water solution of zinc chloride and ammonium chloride may be used.
www.britannica.com /ebc/article-9364605   (928 words)

  
 THR - Contradictory info in Lymans Casting Handbook 3rd edition
The article basically said flux is only necessary to clean out dross...and only needs to be done when adding more material to the pot.
He uses sawdust to flux and leaves the burnt sawdust on the melt to cut down on oxidation causes by the tin making contact with the air as the melt turns over in the pot.
As for commercial flux I'm no expert on such but the one I'm using at present and one which I have a large supply of is from NEI.
www.thehighroad.org /printthread.php?t=1558   (1473 words)

  
 FLUX - LoveToKnow Article on FLUX   (Site not responding. Last check: 2007-09-07)
fluxus, a flowing; this being also the meaning of the English term in medicine, andc.), in metallurgy, a substance introduced in the smelting of ores to promote fluidity, and to remove objectionable impurities in the form of a slag.
The substances in commonest use are:lime or limestone, to slag off silica and silicates, fluor-spar for lead, calcium and barium sulphates and calcium phosphate, and silica for removing basic substances such as limestone.
Sodium and potassium carbonates are valuable for fluxing off silica; mixed with potassium nitrate sodium carbonate forms a valuable oxidizing fusion mixture; fl flux is a reducing flux composed of finely divided carbon and potassium carbonate, and formed by deflagrating a mixture of argol with 3/4 to 3/4 its weight of nitre.
www.1911encyclopedia.org /F/FL/FLUX.htm   (202 words)

  
 AllRefer.com - blast furnace (Metallurgy And Mining: Terms And Concepts) - Encyclopedia
It is narrow at the top, increasing in diameter downward, but narrowing again suddenly almost at the bottom, to form the hearth or crucible.
The furnace is fed from the top with a charge of definite quantities of ore, coke, and a flux, mostly limestone.
Flux and ore are sometimes combined into pellets.
reference.allrefer.com /encyclopedia/B/blastfur.html   (500 words)

  
 metallurgy. The Columbia Encyclopedia, Sixth Edition. 2001-05
Powder metallurgy deals with the manufacture of ferrous and nonferrous parts by compacting elemental metal or alloy powders in a die.
Extractive metallurgy is the study and practice of separating metals from their ores and refining them to produce a pure metal.
This article discusses the extraction of metals in general terms, but methods for the treatment of ores are quite diverse; see also aluminum, copper, gold, iron, lead, nickel, silver, tin, and zinc for special procedures followed.
www.bartleby.com /65/me/metallur.html   (791 words)

  
 Flux-cored arc welding - Wikipedia, the free encyclopedia
FCAW requires a continuously fed consumable tubular electrode containing a flux and a constant voltage or, less commonly, a constant current welding power supply.
An externally supplied shielding gas is sometimes supplied, but often the flux itself is relied upon to generate the necessary protection from the atmosphere.
The process is widely used in construction because of its high welding speed and portability.
en.wikipedia.org /wiki/Flux-cored_arc_welding   (189 words)

  
 Surface Mount Technology (SMT) - Basic Metallurgy and Wavesoldering Trends
Flux is used to clean the oxidized surfaces to be soldered.
The flux is then preheated to remove the flux solvent (usually water or alcohol) from the PCB.
Returning to metallurgy basics is the method for predicting systems in the near future as the drive to find more environmentally friendly materials are sought and dictated by government regulations.
smt.pennnet.com /Articles/Article_Display.cfm?Article_ID=93573   (2235 words)

  
 Mech: What flux is in your toolbox?
Most disturbing is that the container label for the flux paste has a clear warning not to use it on electrical components.
The flux paste I continuously find is part number 0-F-506 and NSN 00-255-4566, and it contains zinc chloride and ammonium chloride.
The experts from Crane said, "Every assembly this paste flux has touched may have reduced reliability and may cause premature failure." Yet, many technicians told me the paste is easier to use and to clean up, but they need to consider the additional work required to repair the damage done from the wrong material.
www.findarticles.com /p/articles/mi_m0PAE/is_2004_Spring/ai_n6134480   (403 words)

  
 flux --  Encyclopædia Britannica
Since the slag is lighter than iron, it floats on top of the melted iron, which is from four to five feet...
The reducing agents, or flux, were oyster and clam shells found along the Jersey shore.
Program engaged in studying the movement of fluxes between the different components of the environment.
www.britannica.com /eb/article-9034689?tocId=9034689   (886 words)

  
 FUTURE SPACECRAFT PROPULSION SYSTEMS
The lower the exhausted mass flux rate the lower the fuel mass fraction for the accomplishment of a given mission (impulse).
Exhausted mass flux rates are limited by the constricting neutralizing grid's presence in the exhaust stream.
This is due to significantly lower exhaust velocity and plasma mass flux rate of the fusion reactors VEP exhaust stream, when compared to the much greater exhaust velocity of the Dual Beam Ion Thrusters themselves.
www.angelfire.com /co/rwrwrw/prop01.html   (8204 words)

  
 MSN Encarta - Dictionary - flux definition
metallurgy soldering aid: a substance that promotes the fusion of two substances or surfaces.
metallurgy smelting aid: a substance added to molten ore that combines with impurities to form slag for extraction
transitive verb metallurgy put flux on something: to apply flux to something, especially a joint being soldered
encarta.msn.com /dictionary_/flux.html   (267 words)

  
 Contradictory info in Lymans Casting Handbook 3rd edition - THR
The greyish scum is tin, iirc, and needs flux so it mixes with the other metal.
The borax thing is interesting, I use anhydrous borax for flux when forge welding...
It just bothers me a bit when there is so much "knowledge" passed on (I got it from my dad too) that may (or may not?) be true at all.
www.thehighroad.org /showthread.php?t=1558   (1566 words)

  
 Gas-shielded cored wires find their niche
They usually are produced from a thin, flat ribbon of steel that is formed into a U shape, filled with the flux and alloy formulation, and then closed into a tube with the flux and alloy on the inside.
Flux- and metal-cored wires are particularly suitable for one-sided welding on open butt joints.
Not all applications are suitable for cored wires, but end users should be aware of the basic economics of welding to determine the actual cost per pound of deposited weld metal (rather than cost per pound of product) to choose the best wire for a particular application.
www.thefabricator.com /Articles/Welding_Article.cfm?ID=127   (1639 words)

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