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- Delay_composition abstract "Delay composition, also called delay charge or delay train, is a pyrotechnic composition, a sort of pyrotechnic initiator, a mixture of oxidizer and fuel that burns in a slow, constant rate that should not be significantly dependent on temperature and pressure. Delay compositions are used to introduce a delay into the firing train, e.g. to properly sequence firing of fireworks, to delay firing of ejection charges in e.g. model rockets, or to introduce a few seconds of time between triggering a hand grenade and its explosion. Typical delay times range between several milliseconds and several seconds.A popular delay charge is a tube of pressed black powder. The mechanical assembly prevents the outright detonation of the charge.While delay compositions are principally similar to other fuel-oxidizer compositions, larger grain sizes and less aggressively reacting chemicals are used. Many of the compositions generate little or no gas during burning. Typical materials used are: Fuels: silicon, boron, manganese, tungsten, antimony, antimony trisulfide, zirconium, zirconium–nickel alloy, zinc, magnesium, etc. Oxidizers: lead dioxide, iron oxides, barium chromate, lead chromate, tin(IV) oxide, bismuth(III) oxide, barium sulfate (for high-temperature compositions), potassium perchlorate (usually used in small amount together with other oxidizers), etc. Additives to cool down the flame and slow down the reaction can be employed; inert materials or coolants like titanium dioxide, ground glass, chalk, sodium bicarbonate, etc. are common.The burn rates are dependent on: [1] nature of fuel - fuels that release more heat burn faster nature of oxidizer - oxidizers that require less heat to decompose burn faster the composition ratio - stoichiometric mixtures burn the fastest, also slight excess of metallic fuel also increases burn rate, probably due to heat transfer particle sizes - smaller particles burn faster, but too small particles may lead to incomplete or interrupted burn due to too narrow heating zone mechanical assembly and housing - charge diameter and thermal conductivity of housing influence lateral heat losses ambient temperature - ideally this dependence is very low but extremely low or extremely high temperatures may have influenceExamples of some compositions are: [2] black powder with addition of inert material, e.g. chalk or sodium bicarbonate lead(II) oxide with silicon, burning at 1.5–2 cm/s red lead with silicon, burning at intermediate rate lead(IV) oxide with silicon, burning at 5–6 cm/s potassium permanganate with antimony, very slow Manganese Delay Composition: manganese with lead chromate and barium chromate (lead chromate is the principal oxidizer, barium chromate acts as burning rate modifier, the more of it the slower the reaction) [3] Tungsten Delay Composition: tungsten with barium chromate and potassium perchlorate [4]Zirconium Nickel Alloy Delay Composition: zirconium-nickel alloy with barium chromate and potassium perchlorate. boron with barium chromate [5]↑ ↑ ↑".
- Delay_composition wikiPageExternalLink 000020010901A0317367.php.
- Delay_composition wikiPageExternalLink 689991-1.html.
- Delay_composition wikiPageExternalLink ennews.asp?newsid=10.
- Delay_composition wikiPageExternalLink Explosives.htm.
- Delay_composition wikiPageExternalLink patent_with_highlight.html?patent_num=4963204&q=additionally.
- Delay_composition wikiPageID "21051994".
- Delay_composition wikiPageLength "4167".
- Delay_composition wikiPageOutDegree "55".
- Delay_composition wikiPageRevisionID "645022903".
- Delay_composition wikiPageWikiLink Antimony.
- Delay_composition wikiPageWikiLink Antimony_trisulfide.
- Delay_composition wikiPageWikiLink Barium_chromate.
- Delay_composition wikiPageWikiLink Barium_sulfate.
- Delay_composition wikiPageWikiLink Bismuth(III)_oxide.
- Delay_composition wikiPageWikiLink Boron.
- Delay_composition wikiPageWikiLink Category:Pyrotechnic_compositions.
- Delay_composition wikiPageWikiLink Category:Pyrotechnic_initiators.
- Delay_composition wikiPageWikiLink Chalk.
- Delay_composition wikiPageWikiLink Ejection_charge.
- Delay_composition wikiPageWikiLink Explosion.
- Delay_composition wikiPageWikiLink Fireworks.
- Delay_composition wikiPageWikiLink Firing_train.
- Delay_composition wikiPageWikiLink Fuel.
- Delay_composition wikiPageWikiLink Gunpowder.
- Delay_composition wikiPageWikiLink Hand_grenade.
- Delay_composition wikiPageWikiLink Iron_oxide.
- Delay_composition wikiPageWikiLink Lead(II)_chromate.
- Delay_composition wikiPageWikiLink Lead(II)_oxide.
- Delay_composition wikiPageWikiLink Lead(II,IV)_oxide.
- Delay_composition wikiPageWikiLink Lead_dioxide.
- Delay_composition wikiPageWikiLink Magnesium.
- Delay_composition wikiPageWikiLink Manganese.
- Delay_composition wikiPageWikiLink Nickel.
- Delay_composition wikiPageWikiLink Oxidizing_agent.
- Delay_composition wikiPageWikiLink Potassium_perchlorate.
- Delay_composition wikiPageWikiLink Potassium_permanganate.
- Delay_composition wikiPageWikiLink Pyrotechnic_composition.
- Delay_composition wikiPageWikiLink Pyrotechnic_initiator.
- Delay_composition wikiPageWikiLink Silicon.
- Delay_composition wikiPageWikiLink Sodium_bicarbonate.
- Delay_composition wikiPageWikiLink Tin_dioxide.
- Delay_composition wikiPageWikiLink Titanium_dioxide.
- Delay_composition wikiPageWikiLink Tungsten.
- Delay_composition wikiPageWikiLink Zinc.
- Delay_composition wikiPageWikiLink Zirconium.
- Delay_composition wikiPageWikiLinkText "Delay composition".
- Delay_composition wikiPageWikiLinkText "delay composition".
- Delay_composition wikiPageWikiLinkText "delay element".
- Delay_composition wikiPageWikiLinkText "delay".
- Delay_composition wikiPageWikiLinkText "pyrotechnic delay".
- Delay_composition wikiPageUsesTemplate Template:Chem-stub.
- Delay_composition wikiPageUsesTemplate Template:Reflist.
- Delay_composition subject Category:Pyrotechnic_compositions.
- Delay_composition subject Category:Pyrotechnic_initiators.
- Delay_composition hypernym Composition.
- Delay_composition type MusicalWork.
- Delay_composition type Composition.
- Delay_composition comment "Delay composition, also called delay charge or delay train, is a pyrotechnic composition, a sort of pyrotechnic initiator, a mixture of oxidizer and fuel that burns in a slow, constant rate that should not be significantly dependent on temperature and pressure. Delay compositions are used to introduce a delay into the firing train, e.g. to properly sequence firing of fireworks, to delay firing of ejection charges in e.g.".
- Delay_composition label "Delay composition".
- Delay_composition sameAs Q5253473.
- Delay_composition sameAs m.05b2bj2.
- Delay_composition sameAs Q5253473.
- Delay_composition wasDerivedFrom Delay_composition?oldid=645022903.
- Delay_composition isPrimaryTopicOf Delay_composition.