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Initiation by hot wire

Detonation Rate, 1500 m/sec (unconfined and initiated by hot wire), 1700 m/sec (unconfined and initiated by impact with grit particle), and... [Pg.598]

The only value of detonation velocity the current authors were able to find is 1,700 m s reported for 0.5 mm thick unconhned film initiated by hot wire [103]. [Pg.61]

After ignition, small crystals of cyanuric triazide bum (unlike silver azide) even though Ficheroulle and Kovache reported them exploding violently by the action of flame [136]. The outcome of initiation by hot wire depends on temperature. At 20-50 °C it only cracks while at 75 °C it explodes [136],... [Pg.114]

It could not be detonated by hot wire initiation, but a sample exploded during distillation at ambient pressure at 102°C. [Pg.593]

Ignition by Hot Wires. Now we turn to a discussion of ignition by hot wires, but we purposely exclude studies on EED s (See Vol 5, pp E63-E68) or initiation of detonation by hot wires (See Initiation, Hot Wire in this Vol). We quote Lewis Von Elbe ... [Pg.276]

Initial mixt composition ranges of knallgas and w vapor in a detonation tube were varied by controlling temps at 100, 200 300°, for knallgas densities of 0.64-1.8, 8.5—16 46-62g/liter, respectively. Ignition was by hot wire. The threshold composition decreased as initial mixt density increased. Threshold compositions were 62, 44 V36% knallgas at 100, 200 300°, or initial mixt densities... [Pg.551]

In the case of electrical initiation lead styphnate or an azide is in direct contact with a resistance wore and serves as a primer. The initiation of lead and silver azides by hot wires was studied in detail by Leopold [9], who used a fixture (Figure 6) to monitor both the electrical energy in the wire and the light output of the explosive. The thermal initiation times were related to wire temperature by an Arrhenius equation of the form ... [Pg.258]

Metathesis reaction to prepare crystalline transition and B metal oxides from halides and sodium peroxide is initiated by a hot wire and can be highly exothermic and explosive in some instances. [Pg.1827]

Pentanitroaniline (PNA) has five neighboring nitro groups and is destabilized even more than the tetranitro compound by repulsive steric interactions. The 3- and 5-nitro groups are easily hydrolyzed as observed earlier for HNB. PNA was studied as an initiating explosive (a sensitive explosive that will decompose to hot gaseous products explosively by a hot wire or weak shock)98. [Pg.366]

Initiation by Primers (and Boosters) is the standard method of initiating secondary explosives. Thus hot wires (or other means) are used to initiate the primer charge (Lead Azide, Mercuric Fulminate etc) explosive whose detonation then initiates the main charge of PETN,... [Pg.372]

To measure the rate of burning, fine wires of some low-melting metal (fuze wire) were threaded thru holes drilled diametrically thru the strand at accurately measured intervals (eg, 1r ). Two or more wires were used. Each wire was attached in series with an electric timer. The strand was mounted in a holder and placed vertically inside a dosed chamber. A given initial pressure was established in the chamber by using high, pressure N2. The initial temp was controlled by means of a constant-temp bath, and ignition of the strand was accomplished by means of a hot wire wrapped around it at one end... [Pg.446]

Another method similar to flame as an impulse is to ignite the explosive by heat (Figure 5.3, B + C). A bridgewire which is heated by an electric current is either in direct contact with the primary explosive (hot-wire initiator), or first it is in contact with a pyrotechnical composition which then initiates the primary explosive by flame. This second type, called an electric match, is the most common initiation method in blasting caps worldwide. However, there is also a type of detonator known which achieves detonation without a primary explosive. This type of deto-... [Pg.139]

While Region II can be compared with the hot-wire initiation of primary explosives or pyrotechnic compositions, the laser power densities in region IV also make it possible to directly shock initiate secondary explosives by laser irradiation. The laser power densities of Region IV are achieved by solid-state lasers with laser powers of at least 100 W. In contrast, laser diodes ( 1-10 W) only provide power densities which fall into the regions II and III. However, more powerful laser diodes have been gradually developed and therefore, laser diode initiators (LDI) have be-... [Pg.145]

Concluding, based on these aspects, the laser initiation of explosives by laser diode radiation seems to be a very attractive and initiation method of the future. However, due to the limited power of laser diodes, the explosives might be thermally ignited and undergo a DDT, in contrast to the shock initiation which results by high-power solid-state laser radiation. The operating mode of laser diode initiators can be compared to that of electric hot-wires but with faster function times as has been demonstrated in the literature. [Pg.147]


See other pages where Initiation by hot wire is mentioned: [Pg.371]    [Pg.371]    [Pg.92]    [Pg.201]    [Pg.371]    [Pg.371]    [Pg.92]    [Pg.201]    [Pg.372]    [Pg.372]    [Pg.255]    [Pg.66]    [Pg.2]    [Pg.351]    [Pg.119]    [Pg.174]    [Pg.222]    [Pg.93]    [Pg.99]    [Pg.219]    [Pg.366]    [Pg.871]    [Pg.246]    [Pg.215]    [Pg.352]    [Pg.120]    [Pg.126]    [Pg.146]    [Pg.146]    [Pg.219]   
See also in sourсe #XX -- [ Pg.7 ]




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