Smokeless powder erosiveness

Apart from physical agents such as temperature and the mechanical action of gases, chemical agents also cause the erosion. Monni [50] noticed that the erosiveness of smokeless powder decreases with the addition of charcoal, probably because the additional quantity of carbon thus introduced serves to carbonize the steel which may undergo decarbonization under the influence of C02 at a high temperature, according to the reaction ... 

The idea of adding nitroguanidine to smokeless powder had been already considered by Vieille [45]. He suggested adding nitroguanidine to reduce the erosiveness of the powder (see p. 548)... 

Under high pressure powdered PETN agglomerates to a mass which has the appearance of porcelain, but which, when broken up into grains, is a very powerful smokeless powder functioning satisfactorily with the primers which are commonly used in small arms ammunition. The powder is hot and unduly erosive, but cooler powders have been prepared by incorporating and compressing PETN in binary or in ternary mixtures with TNT,... 

Figure 72. Paul Vieille (1854-1934). Inventor of poudre B, the first progressive-burning smokeless powder, 1884. Author of classic researches on erosion. Secretary and later, as successor to Berthelot, President of the French Powder and Explosives Commission.

CSP 2 (Chilworth Smokeless Powder, No 2). This is a tubular double-base proplnt which may be considered as a modification of Cordite (qv). It consists of NC (N content 12.70 0.15%) 70.5, NG 23-5, petroleum jelly 5 Na bicarbonate 1% (Ref 3). The density of the proplnt is 1-56 g/cc. Some other props are calcd by Alvaro Alberto (Ref 2) and applied to the problem of erosion of proplnts. CSP 2 has been known since ca 1902 and has been manufd or adopted by several countries, including Germany, Gt Britain, Brazil (1908), Italy (1910) Spain. It was manufd in Italy by the Societa Italians Dinamite Nobel, Avigliana under the name CZPolvere) (Refs 4 5) and in Spain at the Fabrica de Galdacano of the Union Espanola de Explosivos under the name Polvora sin Humo de Chilworth (Ref 3). This proplnt has been used in various cannons such as cal 76.2mm, 101.6mm, 15 cm, 30.5cm others See also C-2 (Polvere), Vol 2, p Cl-L Refs l)Marshall, Diet (1920), 26 2)Alvaro... 

Smokeless powder 577-601 (111/528) erosive ness of 585 (III/531.548) free radicals in the change of diphenyl-amine 5(11-582... 

Kinetics of decomposition Liectric susceptif>ilily of single have powder Erosive ness of smokeless powder Manufacture of pmvder Single base powtler Ooiihle base powder I raditional double base powder Rockel double base powiler... 

G-117-b (Rocket Powder). A double-base solventless extruded proplnt consisting of NC 50.0, NG 30.0, DNT 14.5, Ethyl Centralize 4.0 K sulfate 1.5% with carbon black 0.02 Pb stearate 0.40 added. This proplnt is smokeless, but has a high heat of expln which may give nozzle trap erosion Ref W.E. Campbell Jr L.H. Brown, Aerojet Report No 194(1946), p 12... 

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