Thermites

Magnesium fluoride is a by-product of the manufacture of metallic beryllium and uranium. The beryllium or uranium fluorides are intimately mixed with magnesium metal in magnesium fluoride-lined cmcibles. On heating, a Thermite-type reaction takes place to yield the desired metal and Mgp2 (13). Part of the magnesium fluoride produced in this reaction is then used as a lining for the cmcibles used in the process. 

Technical molybdic oxide can be reduced by reaction of ferrosiUcon in a thermite-type reaction. The resulting product contains about 60% molybdenum and 40% iron. Foundries generally use ferromolybdenum for adding molybdenum to cast iron and steel, and steel mills may prefer ferromolybdenum to technical molybdic oxide for some types of steels. 

At high temperatures, aluminum reduces many oxygen-containing compounds, particularly metal oxides. These reactions, of the type shown in equation 6, are used in the manufacture of certain metals and alloys, as well as in the thermite welding process. ... 

Ferrovanadium can also be prepared by the thermite reaction, in which vanadium and iron oxides are co-reduced by aluminum granules in a magnesite-lined steel vessel or in a water-cooled copper cmcible (11) (see Aluminumand aluminum alloys). The reaction is initiated by a barium peroxide—aluminum ignition charge. This method is also used to prepare vanadium—aluminum master alloys for the titanium industry. 

Thermite is essentially a mixture of ca 73 wt % powdered iron(III) oxide, Fe202, and 27 wt % powdered or granular aluminum. The aluminum has a... 

Under favorable conditions the thermite produces temperatures of about 2200°C, high enough to turn the newly formed metallic iron into a white-hot Liquid that acts as a heat reservoir to prolong and spread the heat or igniting action. 

The thermate mixture, composed of thermite and various additives, is used in igniter compositions for magnesium bombs. A number of such compositions have been developed. Three of these were Therm-8, Thermate-TH2 (formerly Therm-8-2), and Thermate-TH3 (formerly Therm-64-C). Therm-8 was the precursor of later, improved igniting formulations TH2 differs from Therm-8 in that TH2 contains no sulfur and slightly less thermite. TH3 was found to be superior to the others and thus adopted for use in the incendiary magnesium bomb. The wt % composition of TH3 is thermite, 68.7 barium nitrate, 29.0 sulfur, 2.0 and as a binder, oil, 0.3. 

Connection of cable pipes by Thermit welding, field coating, including material and earthworks DM 700... 

Commercial triphenylphosphine was used without further purification. Metal and Thermit Corp., Rahway, New Jersey, now offers this reagent for sale at a modest price. 

Sparks created by arcs in electrical switchgear, engines, motors, or by friction (e.g. lighter spark). Aluminium, magnesium, titanium and their alloys have an affinity for oxygen and in a thermite reaction with rust produce temperatures <3000°C. A thermite flash can result from the... 

Reaction with other substances Thermite reaction Rust Exothermic reactions with aluminium, aluminium alloys... 

Striking of a smear or thin coating of alloy on rusty steel with a hammer. The glancing impact of stainless steel, mild steel, brass, copper-heryllium hronze, aluminium copper and zinc onto aluminium smears on rusty steel can initiate a thermite reaction of sufficient thermal energy to ignite flammahle gas/vapour-air atmosphere or dust clouds. 

Thermite compositions Aluminium/phosphorus pesticide compositions... 

Chemical reaction sources catalysis, reaction with powerful oxidants, reaction of metals with halocarhons, thermite reaction, thermally unstahle materials, accumulation of unstahle materials, pyrophoric materials, polymerization, decomposition, heat of adsorption, water reactive solids, incompatihle materials. 

Thermit-bom be, /. thermite bomb, -brand-bombe, /. thermite incendiary bomb, -fiil-iung, /. thermite filling or charge, -ladung, /. thermite charge, -schweissung,/. thermite weld(ing). -verfahren, n. thermite process. 

Aluminium alloys are susceptible to thermite sparking when dropped on to rusty surfaces. Consequently their use may be subject to restrictions. For example, in ships tanks the weight of the anode and the height that it is suspended are strictly controlled. This is because thermite sparking is dependent on the kinetic energy of the anode. 

The susceptibility of magnesium to thermite sparking when dropped onto rusty surfaces can preclude its consideration for applications involving a spark hazard, e.g. tankers carrying inflammable petroleum products. 

The thermite reaction was once used to weld rails ... 

The thermite reaction is spectacular and highly exothermic. It involves the reaction between Fe203, ferric oxide, and metallic aluminum. The reaction produces white-hot, molten iron in a few seconds. Given ... 

How much energy is released in the manufacture of 1.00 kg of iron by the thermite reaction mentioned in Problem 10 ... 

Thermal equilibrium, 56 Thermite reaction, 122 Thermometers, 56 Thiosulfate ion, 362 Third-row elements, 101 compounds, 102 physical properties, 102 properties, table, 101 Third row of the periodic table, 364 Thomson, J. J., 244 Thomson model of atom, 244 Thorium... 

Schladt, Study of the Use of Thermite Type Compositions As Pyrotechnic Uluminants PATR 128 (1931) 4) Ibid, Development of... 

Igniters. A pellet composed of 26.5% K. perchlorate, 16.6% Ba nitrate, 53,9% 50/50 Zr/Ni alloy, and 3.0% et cellulose can be used to ignite solid propint grains (Ref 25), A series of mixts of K perchlorate with powd metals and other oxidizable mat were examined as substitutes for BikPdr as a gun primer. Most of the mixts tested were found to be satisfactory and to be compatible with brass and other metals (Ref 9) Incendiary Compositions. Stoichiometric mixts of K perchlorate with metals and oxidizable mat have been proposed as incendiaries of the Thermit type and have heats of reaction as follows Al dust 2504, powd Mg 2429. red P 1477, powd S 705 and powd C (lampblack) 1118cal/g (Ref 4). A mixt of 12.5% K perchlorate, 75% powd Zr, and 12,5% of a 50/50 Al/Mg alloy is reported to be a readily-ignited incendiary (Ref 20). Mixts of powd Al and/or powd Fe with K perchlorate with 1.5—2% NC as a binder are also good incendiaries (Ref 35). 

A promising discovery for increasing the ignitabiiity of Thermite (Voi 7,173-R Ref 134, pp 3—5) mixts has been the admixture of Ni powder (Ref 29). The basis for this finding... 

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