define quenched chemistry
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quenching /quench·ing/ (kwench´ing) 1. suppressing or diminishing a physical property, as of heat in a metal by immersion in cold liquid. 2. decrease of fluorescence from an excited molecule by other molecules that absorb some emission energy that would otherwise occur as light.
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Study of quench effect on heavy metal uptake efficiency by an aluminosilicate-based material In this work, the quench effect on the textural properties and surface functional groups has been studied by the functionalization of a waste-derived aluminosilicate material. The porous structure has been changed in the presence of a quench reagent.
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- tr.v. quelled, quell·ing, quells. 1. To put down forcibly; suppress: Police quelled the riot. 2. To pacify; quiet: finally quelled the children's fears. [Middle English. , to kill, from Old English. ; see gwelə- in Indo-European roots .].
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Carbonization Carbonization (or carbonisation) is the term for the conversion of an organic substance into carbon or a carbon-containing residue through pyrolysis or destructive distillation.his carbonization, which can also be seen as a spontaneous breakdown of the wood, continues until only the carbonised residue called charcoal remains. Unless further external heat is provided, the process stops and the temperature reaches a maximum of about 400°C.
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Organic Compounds In organic chemistry, a saturated compound is a chemical compound that has a chain of carbon atoms linked together by single bonds. Saturated hydrocarbons are called alkanes. An unsaturated compound is a chemical compound that contains carbon-carbon double bonds or triple bonds, such as those found in alkenes or alkynes, respectively. Saturated and unsaturated compounds need not consist only of a carbon atom chain. They can form straight chain, branched chain, or ring arrangements. They can have
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Quenching Tempering is usually performed after hardening, to reduce some of the excess hardness, and is done by heating the metal to some temperature below the critical point for a certain period of time, then allowing it to cool in still air.
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- quench verb [T]. › to ​drink ​liquid so that you ​stop being ​thirsty: When it's ​hot, it's ​best to quench ​your ​thirst with ​water. › literary to use ​water to put out a ​fire: The ​flames were quenched by ​heavy ​rain. › to ​satisfy a need or ​wish: Her ​thirst for ​knowledge will never be quenched.
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Hardening and tempering Neutral hardening A heat treatment used to achieve high hardness/strength on steel which consists of austenitising, quenching and tempering, in order to retain a tempered martensite or bainite structure.
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- This invention relates to an active quench circuit for an avalanche current device, and more particularly to such a quench circuit which utilizes the slow turn-off speed of a current amplifier to generate a quenching voltage after the avalanche current has subsided.
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Quenching and tempering of welded carbon steel tubulars Figure 1: A schematic of a heat treating line layout. The process of quenching and tempering carbon steel tubulars is not unlike that which is applied to other carbon steel shapes: the part is heated to about 1,600 degrees Fahrenheit, cooled rapidly, and reheated to a temperature less than about 1,300 degrees F.
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Definition of 'quench' Word forms: (present) quenches, (past) quenched, (perfect) quenched, (progressive) quenching. verb. ( Automotive engineering : Vehicle components , Engine, transmission, and exhaust ) If gases in the cylinder head are quenched during combustion in an internal combustion engine, a portion of them are cooled.
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quench quench (plural quenches) The abnormal termination of operation of a superconducting magnet, occurring when part of the superconducting coil enters the normal state.
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Tempering (metallurgy) Quenched-steel. Tempering is most often performed on steel that has been heated above its upper critical (A 3) temperature and then quickly cooled, in a process called quenching, using methods such as immersing the red-hot steel in water, oil, or forced-air.
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- (kwĕl). tr.v. quelled, quell·ing, quells. 1. To put down forcibly; suppress: Police quelled the riot. 2.
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Mineralogy At the cooler temperature, the solution is saturated at a much lower concentration of solute. The solute that can no longer be held in solution forms purified crystals of solute, which can later be collected. Recrystallization works only when the proper solvent is used. The solute must be relatively insoluble in the solvent at room temperature but much more soluble in the solvent at higher temperature.
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- Carbon. By definition, organic chemistry is the study of chemical compounds that contain Carbon (C) with exception of carbonates, bicarbonates, metallic cyanides and carbides.
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- First of all, the class of materials that exhibit the largest reduction in ductility at low temperatures is high strength steel alloys. This phenomenon is called ductile to brittle transition (DBT) and happens primarily with BCC crystalline materials (which tungsten is also).
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Heatbath Â®Corporation / Park Metallurgical The Basics of Molten Salt Quenchants. Taken from Heat Treating Progress magazine, August 2003 edition. Molten salt is an ideal medium for interrupted quenching processes. Nitrate-based salt, the most widely used, blankets the quench temperature range of 150 to 595 degrees C (300 to 1100 degrees F).
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chain reaction Unbranched chain reactions. Let us examine chemical processes with unbranched chains using as an example the photochemical reaction between hydrogen and chlorine. In this chain reaction, a chlorine molecule, absorbing a quantum of light, decomposes into two atoms.
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Quench hardening of steel The martensite of quenched tool steel is exceedingly brittle and highly stressed. Consequently cracking and distortion of the object are liable to occur after quenching. Retained austenite is unstable and as it changes dimensions may alter, e.g. dies may alter 0,012 mm.
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Carbonization Carbonization (or carbonisation) is the term for the conversion of an organic substance into carbon or a carbon-containing residue through pyrolysis or destructive distillation. It is often used in organic chemistry with reference to the generation of coal gas and coal tar from raw coal.
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- Quench is defined as to satisfy or to extinguish. An example of to quench is to have a cold drink when thirsty. An example of to quench is to put out a fire.
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Sulfide Corrosion induced by sulfide. Dissolved free sulfides (H2S, HS− and S2−) are very aggressive species for the corrosion of many metals such as steel, stainless steel, and copper. Sulfides present in aqueous solution are responsible for stress corrosion cracking (SCC) of steel, and is also known as sulfide stress cracking. Corrosion is a major concern in many industrial installations processing sulfides: sulfide ore mills, deep oil wells, pipelines transporting soured oil, Kraft paper factories.
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Metal Hardening / Metal Quenching / Metal Tempering Alloys may be air cooled, or cooled by quenching in oil, water, or another liquid, depending upon the amount of alloying elements in the material and final mechanical properties to be achieved. Hardened materials are tempered to improve their dimensional stability and toughness.
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Quenchant Fundamentals: Condition Monitoring of Quench Oils Quench oil characterization is readily performed by measuring a series of physical properties including: viscosity, water content, neutralization number, precipitation number and flash point (Table 1).
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Which oil is used for quenching process during hardening of metal? , Masters in Materials Science and Engineering from IIT Bombay. 1  Due to its versatile quenching performance, oil is the most widely used quenching medium, next only to water. 2  Quench oils are available with flash points ranging from 270°F to 560°F.