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- Forming_gas abstract "Forming gas is a mixture of hydrogen (mole fraction varies) and nitrogen. It is sometimes called a "dissociated ammonia atmosphere" due to the reaction which generates it:2 NH3 → 3H2+ N2It can be also manufactured by thermal cracking of ammonia in an ammonia cracker or forming gas generator.Forming gas is used as an atmosphere for processes that need the properties of hydrogen gas. Forming gas, like hydrogen, is explosive. The lower explosion limit for 100% hydrogen is < 4% and for forming gas 5,6% at room temperature. At higher gas temperature accordingly lower. It is used in chambers for gas hypersensitization, a process in which photographic film is heated in forming gas to drive out moisture and oxygen and to increase the base fog of the film. Hypersensitization is used particularly in deep-sky astrophotography, which deals with low-intensity incoming light, requires long exposure times, and is thus particularly sensitive to contaminants in the film.Forming gas is also used to regenerate catalysts in glove boxes and as an atmosphere for annealing processes. It can be purchased at welding supply stores. It is sometimes used as a reducing agent for low and high-temperature soldering and brazing, to remove oxidation of the joint without the use of flux.Quite often forming gas is used in furnaces during annealing for the thermal treatment of steel, because it reduces oxides on the metal surface.".
- Forming_gas wikiPageID "8791730".
- Forming_gas wikiPageRevisionID "594262206".
- Forming_gas hasPhotoCollection Forming_gas.
- Forming_gas subject Category:Brazing_and_soldering.
- Forming_gas subject Category:Gases.
- Forming_gas subject Category:Industrial_gases.
- Forming_gas subject Category:Metal_heat_treatments.
- Forming_gas subject Category:Welding.
- Forming_gas type Abstraction100002137.
- Forming_gas type Act100030358.
- Forming_gas type Activity100407535.
- Forming_gas type Care100654885.
- Forming_gas type Event100029378.
- Forming_gas type MetalHeatTreatments.
- Forming_gas type PsychologicalFeature100023100.
- Forming_gas type Treatment100658082.
- Forming_gas type Work100575741.
- Forming_gas type YagoPermanentlyLocatedEntity.
- Forming_gas comment "Forming gas is a mixture of hydrogen (mole fraction varies) and nitrogen. It is sometimes called a "dissociated ammonia atmosphere" due to the reaction which generates it:2 NH3 → 3H2+ N2It can be also manufactured by thermal cracking of ammonia in an ammonia cracker or forming gas generator.Forming gas is used as an atmosphere for processes that need the properties of hydrogen gas. Forming gas, like hydrogen, is explosive.".
- Forming_gas label "Formiergas".
- Forming_gas label "Forming gas".
- Forming_gas label "Forming gas".
- Forming_gas sameAs Formiergas.
- Forming_gas sameAs Forming_gas.
- Forming_gas sameAs m.027jxr0.
- Forming_gas sameAs Q664848.
- Forming_gas sameAs Q664848.
- Forming_gas sameAs Forming_gas.
- Forming_gas wasDerivedFrom Forming_gas?oldid=594262206.
- Forming_gas isPrimaryTopicOf Forming_gas.