The whys and whatfors of bullet propellants thegunmag. The benefits from doublebase are the increased energy. To neutralize the decomposition products, which could otherwise cause corrosion of metals of the cartridges and gun barrels, calcium carbonate is added to some formulations. Propellant geometry type descriptions smokeless propellant has three basic chemistry types. Doublebase propellants are one of the oldest propellant families. Double base propellant uses nitrocellulose and nitroglycerine, while triple base uses the double base. The released heat, in case of bulk storage of the powder, or too large blocks of solid propellant, can cause selfignition of the material. Thermal decomposition properties of doublebase propellant. Singlebase powders have nitrocellulose as the main ingredient.
Investigation of flameless combustion mechanism of m2. The method of claim 1 wherein said reinforcing mesh has strand diameters of about 0. On the critical diameter and hotspot combustion of a. Military explosives tm 90214 department of the army technical manual. The area under the time pressure profile determines the energy. Simplified combustion modeling of double base propellant. H of samples with different ammonium perchlorate apdouble base propellant db mass ratios under argon atmosphere were studied by the thermogravimetrydifferential scanning calorimetrymass spectrometryfourier transform infrared spectroscopy tgdscmsftir and automatic calorimeter method. Us patent for solventless double base propellants and. Crosslinked doublebase propellants chapter 11 have some of the characteristics of the doublebase propellants. Single base powder is a nitrocellulose that is treated so it is safer to use i think it is an alcoholpetrol solvent process. Solid propellant com bustion mechanisms and flame structure m. Formulation and characterization of a new nitroglycerinfree.
Smokeless gun powders are produced in two different forms. Makes me think solo is a single base shotgun powder. Burn rate is unrelated to whether a powder is sb or db. Temperature independent gun propellants based on nc and. Simplified combustion modeling of nitrocellulose nc, nitroglycerin ng double base propellant is considered. I investigation of flameless combustion mechanism of m2 doublebase propellant by cecil eugene kirby langley research center summary an experimental study of the heat reaction for flameless combustion m2 doublebase propellant 20 percent. There are singlebase and doublebase powders throughout the burn rate spectrum. Home journals international journal of energetic materials and chemical propulsion volume 12, 20 issue 1 simple method for prediction of heat of explosion in double base and composite modified double base propellants. Doublebased propellant doublebased propellants consist of nitrocellulose with nitroglycerin or other liquid organic nitrate. Atlantic research company was responsible for pvcs, while hercules was mostly interested in single and doublebase propellants and the possibilities of.
An analysis of experimental data on the critical diameter for burning of nitroglycerinbased propellant nb and on the temperature profiles in the combustion wave on a propellant sample in a heatabsorbing confinement was performed. I experiment until i find one i like, which can often be. Sonb 1 introduction double base propellants composed of nitrocellulose nc and nitroglycerin ng have been used in rocket and gun applications since the late 1800s 1. Lecture 1 combustion energy frontier research center. Burning rate consistency of m26 doublebase propellant is good, i. The chief ingredient of singlebase powder is nitrocellulose. Single base propellant uses only nitrocellulose as the primary. The controlled burning of the propellant composition usually produces thrust by. Im looking at a can of solo which has single base smokeless propellant and a picture of a shotgun shell under those words. However, the burning rate variability of single base propellants is dependent on the dispersion of fibrous nitrocellulose. On detonation, the ignited powder rapidly decomposes into a hot, forceful gas that instantaneously expands and propels the bullet out of the gun bore. Burn rate and ignition ease are dependent upon granule shape and coatings, not powder base. It was demonstrated that, for cylindrical samples placed into a heatabsorbing confinement, there are two values of the critical diameter.
Pdf the effect of the initial temperature on the mechanical properties. Practical gun propellants, based on uniform mixture of nitrocellulose and nitroglycerin double base, a actually older than vieilles and pattersons single base. Pdf the detonation velocity of single base and double base propellants is investigated using two types of ignititor. Beckstead brigham young university, provo, utah abstract ap and hmx are the two oxidizers used most often in modern solid propellants, either composite propellants or composite modified double base propellants. The nitrocellulose is even more plasticized in these compositions than in those made with doublebase casting powder. Double base propellants are composed of nitrocellulosenc plasticized with various amounts of nitroglycerineng. A single based propellant has nitrocellulose as its chief explosives ingredient. The purpose of this work was to determine the safe shelf life of singlebase propellants.
Although the two oxidizers have very similar combustion. Double base propellants composed of nitrocellulose nc and nitroglycerin ng have been used in rocket and gun applications since the late. Presently im reloading hornady brass and the hornady 140 gr eld over both rel 17 and vihta vuori n160. Single base vs double base powders long range hunting forum. Your uncoated grains are likely degressive burning what matters is that the burn rate is way up consistent with pistol type powder. The thermal decomposition properties and the heat of combustion.
While the powder contains many chemicals to generate the desired ignition, it is composed mostly of a chemical called nitrocellulose. Morphology also lends clues to whether a powder is single or doublebase bender 1998. Fbi the manufacture of smokeless powders and their. Wpi a21 material accurate doublebase smokeless powders revision date. Solid and liquid propellants are substances that undergo rapid combustion, producing gaseous products. Singlebase powder definition of singlebase powder by. A metriol trinitrate plasticized doublebase propellant having about 30 to about 70 weight percent nitrocellulose, an energetic plasticizer consisting of about 30 to 60 weight percent metriol trinitrate and about 2 to 20 weight percent triethylene glycol dinitrate which is prepared by the solventless process wherein the process includes slurrying any grade of nitrocellulose with warm water.
A method of manufacturing a consolidated double base propellant system, said method comprising. The double base composition of bullseye was suspect. High pressure burning rates of multibase propellants dtic. Witract conllmia n reverse side it neceseay and idenify by. However as far as i can theorise in my mind, double base powders that contain nitroglycerine dynamite and nitrocellulose as opposed to. Single base propellant uses only nitrocellulose as the primary energetic. Pdf detonation velocities of single and double base propellants. The double base nitrocellulose and nitroglycerin, the alliant reloader series, the new imr enduron powders in theory are capable of higher muzzle velocities across the board but the single base all the old school hodgdon and imr powders 4064, 4350, 4831, 7828, h should in theory be capable of tighter sd and es numbers simply because their simpler and therefore almost certainly more uniform.
Download as pptx, pdf, txt or read online from scribd. Smokeless propellants have been studied and manufactured for many decades. Hi guys from my reasoning, a single base powder should be more temperature sensitive than a double base powder. The ethyl centralite stabilizer is twice that of bullseye and m9 propellant which would improve the temperature tolerance of the hpc1 ncng composition. Double base propellants an overview sciencedirect topics.
Relaxations in double base propellants sciencedirect. Black powder was used as a propellant in guns and rockets until the 20th century, when doublebase gunpowder 40 percent nitroglycerin, 60 percent nitrocellulose came into use. Information categories administration advancement aerographer automotive aviation construction diving draftsman engineering electronics food and cooking logistics math medical music nuclear fundamentals photography religion. Solid propellant com bustion mechanisms and flame structure. Two models with simple but rational chemistry are compared. Singlebased propellant a single based propellant has nitrocellulose as its chief explosives ingredient. Double based propellants consist of nitrocellulose with. Immediately flush with large amounts of water for at least 15 minutes, occasionally lifting the upper and lower. International journal for chemistry and official membership journal of the swiss chemical society scs and its divisions chimia, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership.
And depending on whether the manufacturing process is by extrusion or casting, they are also known in france either as sd solventless or extruded doublebase propellants or edb, or as epictetes cast doublebase propellants or cdb. Singlebase powder definition is an explosive powder or propellant that contains nitrocellulose as the only essential component. Stabilizers and other additives are used to control the chemical stability and enhance the propellants properties. Disc powders, ball powders, and aggregates are doublebase, with the exceptions being the pb and sr series powders manufactured by imr powder company. Lengelle et al, combustion of solid propellants rtoen023 2002. A model for double base propellant combustion article pdf available in symposium international on combustion 221. At the beginning of the year i got a tikka t3x tac a1 6. Smokeless propellant has three basic chemistry types.
The latter is complex, being composed of nitrocellulose nc, nitroglycerine ng, and nq. It simply isnt true that doublebase powders are faster burning than single base. They are, nevertheless, ranked as composite propellants insofar as the solids content ratio is such that the bonding phenomena between the binder and the solids are the predominant factors and govern the behavior of the propellant. In the present work, the first successful combustion modeling of the important energetic material nitroguanidine nq and an associated triple base propellant, m30, is reported. Singlebase nitrocellulose propellants are hygroscopic and most susceptible to degradation.
A combustible propellant that sits between the bullet and the primer in the case. Since the homemade propellant was 6040 double base, flake propellant, it was decided that a lighter load should be tried first. Typical propellant compositions single base, % double base, % composite, %. The kinetic parameters relative to the consumption of the stabilizer diphenylamine dpa added to the. Characteristics and manufacture of spherical smokeless powders.
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