Enhanced propellant performance via environmentally friendly curable surface coating

查看全文 作　　者：Thelma [1]Manning;Jeffrey [1]Wyckoff;Kenneth [1]Klingaman;Viral [1]Panchal;Eugene [1]Rozumov;John [1]Bolognini;Ming Wang [2]Young;Subhash [2]Patel

机构地区：[1]US Army RDECOM ARDEC, Picatinny Arsenal;[2]Polymer Processing Institute

出　　处：《Defence Technology(防务技术)》索引2017年第13卷第3期,共12页

基　　金：the FREEDOM Tech Base Program;the US Army RDECOM ARDEC for their support and the funding provided for this effort 摘　　要：Surface coating of granular propellants is widely used in a multiplicity of propellants for small, medium and large caliber ammunition. All small caliber ball propellants exhibit burning progressivity due to application of effective deterrent coatings. Large perforated propellant grains have also begun utilizing plasticizing and impregnated deterrent coatings with the purpose of increasing charge weights for greater energy and velocity for the projectile. The deterrent coating and impregnation process utilizes volatile organic compounds(VOCs) and hazardous air pollutants(HAPs) which results in propellants that need to be forced air dried which impacts air quality. Propellants undergo temperature fluctuations during their life. Diffusion coefficients vary exponentially with variations in temperature. A small temperature increase can induce a faster migration, even over a short period of time, which can lead to large deviations in the concentration. This large concentration change in the ammunition becomes a safety or performance liability. The presence of both polymeric deterrents and nitroglycerin(NG) in the nitrocellulose matrix and organic solvents leads to higher diffusion rates. This results in continued emissions of VOCs and HAPs. Conventional polymers tend to partition within the propellant matrix. In other words,localized mixing can occur between the polymer and underlying propellant. This is due to solvent induced softening of the polymer vehicle over the propellant grain. In effect this creates a path where migration can occur. Since nitrate esters, like NG, are relatively small, it can exude to the surface and create a highly unstable and dangerous situation for the warfighter. Curable polymers do not suffer from this partitioning due to 'melting' because no VOC solvents are present. They remain surface coated. The small scale characterization testing, such as closed bomb testing, small scale sensitivity, thermal stability,and chemical compatibility, will be presented. The 30 mm gun demonstration firing data at hot, cold, and ambient temperatures will also be presented. 关键词：推进剂性能表面涂层可固化环境友好挥发性有机化合物有害空气污染物大口径弹药硝酸纤维素

相关文献

参考文献（7）
引证文献（3）
耦合文献（0）

参考文献(7)

引证文献(3)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Enhanced propellant performance via environmentally friendly curable surface coating

参考文献(7)

引证文献(3)

用户提示