Carbide sentence example

carbide
  • For silicon carbide see carborundum.
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  • The two principal processes utilized in making calcium carbide by electrical power are the ingot process and the tapping process.
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  • Near the station, below the town, are factories of india-rubber and calcium carbide.
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  • Calcium carbide, graphite, phosphorus and carborundum are now extensively manufactured by the operations outlined above.
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  • Strontium carbide, SrC2, is obtained by heating strontium carbonate with carbon in the electric furnace.
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  • It resembles calcium carbide, decomposing rapidly with water, giving acetylene.
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  • For the theory and elemental laws of electro-deposition see Electrolysis; and for the construction and use of electric generators see Dynamo and Battery: Electric. The importance of the subject may be gauged by the fact that all the aluminium, magnesium, sodium, potassium, calcium carbide, carborundum and artificial graphite, now placed on the market, is made by electrical processes, and that the use of such processes for the refining of copper and silver, and in the manufacture of phosphorus, potassium chlorate and bleach, already pressing very heavily on the older non-electrical systems, is every year extending.
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  • The main exports were asphalt and calcium carbide.
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  • If a few pieces of carbide be dropped into saturated chlorine water the bubbles of gas take I.
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  • Before the commercial production of calcium carbide made it one of the most easily obtainable gases, the processes which were most largely adopted for its preparation in laboratories were: - first, the decomposition of ethylene bromide by dropping it slowly into a boiling solution of alcoholic potash, and purifying the evolved gas from the volatile bromethylene by washing it through a second flask containing a boiling solution of alcoholic potash, or by passing it over moderately heated soda lime; and, second, the more ordinarily adopted process of passing the products of incomplete combustion from a Bunsen burner, the flame of which had struck back, through an ammoniacal solution of cuprous chloride, when the red copper acetylide was produced.
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  • Berzelius, who showed it to be potassium carbide.
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  • Wohler first made calcium carbide, and found that water decomposed it into lime and acetylene.
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  • Moissan in France that if lime and carbon be fused together at the temperature of the electric furnace, the lime is reduced to calcium, which unites with the excess of carbon present to form calcium carbide.
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  • In the manufacture of calcium carbide in the electric furnace, lime and anthracite of the Manufac- highest possible degree of purity are employed.
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  • About 1.8 lb of this is used up for each pound of carbide produced.
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  • Pure crystalline calcium carbide yields 5.8 cubic feet of acetylene per pound at ordinary temperatures, but the carbide as sold commercially, being a mixture of the pure crystalline material with the crust which in the electric furnace surrounds the ingot, yields at the best 5 cubic feet of gas per pound under proper conditions of generation.
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  • The volume of gas obtained, however, depends very largely upon the form of apparatus used, and while some will give the full volume, other apparatus will only yield, with the same carbide, 34 feet.
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  • The purity of the carbide entirely depends on the purity of the material used in its manufacture, and before this fact had been fully grasped by manufacturers, and only the purest material obtainable employed, it contained notable quantities of compounds which during its decomposition by water yielded a somewhat high pro portion of impurities in the acetylene generated from it.
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  • Although at the present time a marvellous improvement has taken place all round in the quality of the carbide produced, the acetylene nearly always contains minute traces of hydrogen, ammonia, sulphuretted hydrogen, phosphuretted hydrogen, silicon hydride, nitrogen and oxygen, and sometimes minute traces of carbon monoxide and dioxide.
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  • The formation of hydrogen is caused by small traces of metallic calcium occasionally found free in the carbide, and cases have been known where this was present in such quantities that the evolved gas contained nearly 20% of hydrogen.
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  • This takes place when in the manufacture of the carbide the material is kept too long in contact with the arc, since this overheating causes the dissociation of some of the calcium carbide and the solution of metallic calcium in the remainder.
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  • The presence of free hydrogen is nearly always accompanied by silicon hydride formed by the combination of the nascent hydrogen with the silicon in the carbide.
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  • The ammonia found in the acetylene is probably partly due to the presence of magnesium nitride in the carbide.
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  • On decomposition by water, ammonia is produced by the action of steam or of nascent hydrogen on the nitride, the quantity formed depending very largely upon the temperature at which the carbide is decomposed.
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  • In the early samples of carbide this compound used to be present in considerable quantity, but now rarely more than% is to be found.
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  • Phosphuretted hydrogen, one of the most important impurities, which has been blamed for the haze formed by the combustion of acetylene under certain conditions, is produced by the action of water upon traces of calcium phosphide found in carbide.
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  • In the generation of acetylene from calcium carbide and water, all that has to be done is to bring these two compounds into contact, when they mutually react upon each other with the formation of lime and acetylene, while, if there be sufficient water present, the lime combines with it to form calcium hydrate.
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  • The decomposition of the carbide by water may be brought about either by bringing the water slowly into contact with an excess of carbide, or by dropping the carbide into an excess of water, and these two main operations again may be varied by innumerable ingenious devices by which the rapidity of the contact may be modified or even eventually stopped.
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  • The result is that although the forms of apparatus utilized for this purpose are all based on the one fundamental principle of bringing about the contact of the carbide with the water which is to enter into double decomposition with it, they have been multiplied in number to a very large extent by the methods employed in order to ensure control in working, and to get away from the dangers and inconveniences which are inseparable from a too rapid generation.
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  • The first class may again be subdivided into generators in which the water rises in contact with the carbide, in which it drips upon the carbide, and in which a vessel full of carbide is lowered into water and again withdrawn as generation becomes excessive.
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  • Another set merely aims at developing the gas from the carbide and putting it into a storageholder with as little � loss as possible, and these are termed "boiled" after being formed.
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  • It is found that the ingot of calcium carbide formed in the furnace, although itself consisting of pure crystalline calcium carbide, is nearly always surrounded by a crust which contains a certain proportion of imperfectly converted constituents, and therefore gives a lower yield of acetylene than the carbide itself.
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  • In breaking up and sending out the carbide for commercial work, packed in air-tight drums, the crust is removed by a sand blast.
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  • The carbide is heated to complete liquefaction and tapped at short intervals.
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  • The run carbide, however, is never so rich as the ingot carbide, since an excess of lime is nearly always used in the mixture to act as a flux, and this remaining in the carbide lowers its gasyielding power.
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  • Calcium carbide, as formed in the electric furnace, is a beautiful crystalline semi-metallic solid, having a density of 2.22, and showing a fracture which is often shot with iridescent "non-automatic."
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  • When carbide is acted upon by water considerable heat is evolved; indeed, the action develops about one-twentieth of the heat evolved by the combustion of carbon.
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  • As, however, the temperature developed is a function of the time needed to complete the action, the degree of heat attained varies with every form of generator, and while the water in one form may never reach the boiling-point, the carbide in another may become red-hot and give a temperature of over 800° C. Heating in a generator is not only a source of danger, but also lessens the yield of gas and deteriorates its quality.
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  • The best forms of generator are either those in which water rises slowly in contact with the carbide, or the second main division in which the carbide falls into excess of water.
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  • Moissan by acting with fluorine on the carbide.
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  • The carbide, SmC2, is formed when the oxide is heated with carbon in the electric furnace.
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  • Alcohol is produced by fermentation from vegetable substances containing starch or sugar, from fermentable sugars produced by the hydrolysis of cellulosic bodies, and synthetically from calcium carbide and from the ethylene contained in coal and coke-oven gases.
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  • The manufacture of alcohol from the sulphite lyes of the wood-pulp industry was contemplated, but carbide, although produced in increasing quantities, was not considered as a possible raw material owing to its greater importance as a source of the fertilizer cyanamide.
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  • There are wood-pulp factories (one worked by an English company employing over 1000 hands), factories for calcium carbide (used for manufacturing acetylene gas), paper and aluminium; and spinning and weaving mills.
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  • A faint smell of acetylene may be perceived during the oxidation in moist air; this is probably due to traces of calcium carbide.
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  • Moissan (Comptes rendus, 1893, 116, p. 349; 1894, 119, p. 185) reduces the sesquioxide with carbon, in an electric furnace; the product so obtained (which contains carbon) is then strongly heated with lime, whereby most of the carbon is removed as calcium carbide, and the remainder by heating the purified product in a crucible lined with the double oxide of calcium and chromium.
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  • Seeing that sodium was the only possible reducing agent, he set himself to cheapen its cost, and deliberately rejecting sodium carbonate for the more expensive sodium hydroxide (caustic soda), and replacing carbon by a mixture of iron and carbon - the so-called carbide of iron - he invented the highly scientific method of winning the alkali metal which has remained in existence almost to the present day.
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  • Although the copper took no part in the reaction, its employment was found indispensable, as otherwise the aluminium partly volatilized, and partly combined with the carbon to form a carbide.
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  • These are cementite, a definite iron carbide, Fe 3 C, harder than glass and nearly as brittle, but probably very strong under gradually and axially applied stress; and ferrite, pure or nearly pure metallic a-iron, soft, weak, with high electric conductivity, and in general like copper except in colour.
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  • Austenite, gamma ('y) iron.-Austenite is the name of the solid solution of an iron carbide in allotropic y-iron of which the metal normally consists when in region 4.
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  • There are cement factories in the town, and calcium carbide is an important article .of export.
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  • The carbide BeC 2 is formed when beryllia and sugar charcoal are heated together in the electric furnace.
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  • Like aluminium carbide it is slowly decomposed by water with the production of methane.
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  • Manganese Carbide, Mn 3 C, is prepared by heating manganous oxide with sugar charcoal in an electric furnace, or by fusing manganese chloride and calcium carbide.
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  • Nitrates of cerium have been described, as have also phosphates, carbonates and a carbide.
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  • The production of aluminium in Switzerland and Scotland, carborundum and calcium carbide in the United States, and soda by the Castner-Kellner process, began to be conducted on an immense scale.
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  • Barium carbide, BaC2, is prepared by a method similar to that in use for the preparation of calcium carbide (see Acetylene).
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  • The output gear drives the upper tungsten carbide anvil via a specially designed housing.
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  • Further advances in warfare were to see Carbide collaborate in the Manhattan project to produce the first atomic bomb 25 years later.
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  • The quality scraper has a long lasting tungsten carbide blade and is supplied with a universal hose connector.
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  • The presence of the carbide makes the metal very brittle.
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  • Home Tungsten products Tungsten carbide Powder Tungsten Carbide Powder Tungsten carbide powder is the intermediate in the line from W powder to cemented carbides.
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  • N ever leave litter or spent carbide in a cave - pollution kills cave life.
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  • If using carbide please note that most of the caves are dry or very nearly so.
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  • Composite coatings of electroless nickel containing silicon carbide exhibits superior abrasive wear resistance to hard chromium plate in some applications.
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  • Starter kit includes special tungsten carbide tipped router cutter, template and three spacer rings.
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  • The complete drill head is made from solid carbide.
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  • Dave had a Nife cell; a carbide lamp and some spare carbide while I had a carbide lamp and two water bottles.
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  • Due to its high melting point, silicon carbide can only be processed in powder form.
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  • It was, therefore, decided to investigate the deposition of chromium carbide onto the tool in question.
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  • We don't use a calcium carbide meter in our damp surveys.
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  • The tool durability increases from high speed steel cemented carbide polycrystalline diamond, but that sequence also applies to costs.
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  • Also the temperature range within which austenite decomposes to form ferrite and carbide on cooling.
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  • A short rest, feed and carbide fettle followed before an enjoyable pull through down five lovely pitches.
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  • The pitch lands on a large (5m x 3m) wet ledge with a pool; a useful carbide fettling spot.
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  • For this purpose, new cemented carbide compositions, based on extremely fine-grained carbide, have been introduced.
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  • Over 40 tons of highly poisonous methyl isocyanate gas leaked out of the pesticide factory of Union Carbide in Bhopal.
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  • Two carbide blades are fitted to the body and they are designed to provide integral chip limitation to prevent kickback.
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  • The miners at this time at Eastern still used carbide lamps.
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  • What Good Woodworking said... nd alcohol marketers are reaching more young viewers by focusing more attention on tungsten carbide scribe cable TV.
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  • Silicon carbide (Eg ~ 3 eV) has begun to establish itself as an effective wide band-gap semiconductor.
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  • Polytype coalescence in Lely vapor grown silicon carbide (SiC) has been studied extensively using the technique of X-Ray Diffraction (XRD ).
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  • In addition to the above gaseous rectifiers of oscillations it has been found that several crystals, such as carborundum (carbide of silicon), hessite, anastase and many others possess a unilateral conductivity and enable us to rectify trains of oscillations into continuous currents which can affect a telephone.
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  • In attempting to classify acetylene generators some authorities have divided them into as many as six different classes, but this is hardly necessary, as they may be divided into two main classes - first, those in which water is brought in contact with the carbide, the carbide being in excess during the first portion of the operation; and, second, those in which the carbide is thrown into water, the amount of water present being always in excess.
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  • Another set merely aims at developing the gas from the carbide and putting it into a storageholder with as little � loss as possible, and these are termed "boiled" after being formed.
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  • As, however, the temperature developed is a function of the time needed to complete the action, the degree of heat attained varies with every form of generator, and while the water in one form may never reach the boiling-point, the carbide in another may become red-hot and give a temperature of over 800° C. Heating in a generator is not only a source of danger, but also lessens the yield of gas and deteriorates its quality.
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  • When dry, sand the surface smooth with a sanding block using 80 grit silicon carbide (used dry).
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  • Polytype coalescence in Lely vapor grown silicon carbide (SiC) has been studied extensively using the technique of X-Ray Diffraction (XRD).
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  • One surface is then lapped using liquid suspensions of successively finer silicon carbide powders.
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  • Figure 8. A good example of a highly disordered silicon carbide crystal shown by the extensive streaking evident along the diffraction rows.
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  • Isotopic analysis of silicon carbide grains from meteorites (Anders and Zinner 1993) indicate characteristics of slow neutron capture reminiscent of AGB stars.
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  • Mounted specimens are ground with rotating disks of abrasive paper, for example wet silicon carbide paper.
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  • Produces a very hard layer of vanadium carbide, typically 10?
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  • Moissanite is a rare mineral with a hexagonal crystal structure that occurs in iron-nickel meteorites and may also be called silicon carbide or carborundum in reference to its chemistry.
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  • Many couples are choosing rings made of titanium, sterling silver, tungsten carbide, and other alternatives.
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  • The combination of tungsten with carbon creates tungsten carbide, the main tungsten material used for jewelry production.
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  • Before purchasing a tungsten wedding band, confirm that it is a tungsten carbide ring and try to find out what other metals are mixed with it.
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  • Nickel is often combined with tungsten carbide for strength.
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  • Check Buy.com for a laser engraved ring made of tungsten carbide.
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  • Aside from the needs of protection, miners need to see, and even before Bullard was putting out helmets he was selling carbide lamps mounted on the bills of the miners' caps.
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  • Other theories of a like nature were brought forward by various chemists, Mendeleeff, for example, ascribing the formation of petroleum to the action of water at high temperatures on iron carbide in the interior of the earth.
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  • It is a centre of the iron and steel industries, producing principally cast steel, cast iron, iron pipes, wire and wire ropes, and lamps, with tin and zinc works, coal-mining, factories for carpets, calcium carbide and paper-roofing, brickworks and breweries.
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  • Calcium cyanamide has assumed importance in agriculture since the discovery of its economic production in the electric furnace, wherein calcium carbide takes up nitrogen from the atmosphere to form the cyanamide with the simultaneous liberation of carbon.
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  • There is a third class of operations, exemplified by the manufacture of calcium carbide, in which electricity is employed.
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  • Ordinarily carbon is used as the electrode material, but when carbon comes in contact at high temperatures with any metal that is capable of forming a carbide a certain amount of combination between them is inevitable, and the carbon thus introduced impairs the mechanical properties of the ultimate metallic product.
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  • When prolonged heating is required at very high temperatures it is found necessary to line the furnace-cavity with alternate layers of magnesia and carbon, taking care that the lamina next to the lime is of magnesia; if this were not done the lime in contact with the carbon crucible would form calcium carbide and would slag down, but magnesia does not yield a carbide in this way.
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  • The arc furnaces now widely used in the manufacture of calcium carbide on a large scale are chiefly developments of the Siemens furnace.
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  • The class of furnaces heated by electrically incandescent materials has been divided by Borchers into two groups: (I) those in which the substance is heated by contact form at least so much carbide as would suffice, when diffused through the metal, to render it brittle, practically restricts the use of such processes to the production of aluminium alloys.
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