李曼曼 1任欣宇 2郭志罡 1岳春晖 1魏伦 1李强 1王琼林1
作者信息
- 1. 西安近代化学研究所,陕西 西安 710065
- 2. 山西北方兴安化学工业有限公司,山西 太原 140100
- 折叠
摘要
Abstract
To investigate the evolution of the internal structure and mechanical properties of double-base flake gun propellant dur-ing pressing,samples from four typical processing stages—raw materials,thin pressing(1,3,5,and 7 passes),thick pressing(1,3,5,7,and 10 passes),and finishing pressing(1 and 2 passes)—were systematically characterized.A combination of ana-lytical techniques,including scanning electron microscopy(SEM),micro-computed tomography(μ-CT),Fourier transform in-frared spectroscopy(FTIR),tensile testing,dynamic mechanical analysis(DMA),and linear expansion coefficient measure-ments,was employed to elucidate microstructural evolution,component interactions,and macro-property variations under ther-momechanical coupling.The results indicate that thin pressing constitutes the main dehydration phase,reducing the water con-tent from 22.6%to 0.46%and increasing the density from 1.474 g·cm-3 to 1.611 g·cm-3.At this stage,the nitrocellulose(NC)fibrous framework becomes clearly visible,and initial plasticization occurs.Thick pressing is identified as the critical period for plasticization,during which nitroglycerin(NG)molecules penetrate between NC molecular chains,disrupting the original hydrogen-bond network and forming new intermolecular interactions.This process significantly enhances the elongation at break to over 50%,eliminates internal pores and defects,and results in a homogeneous and dense structure.In contrast,fine pressing mainly serves to adjust the propellant sheet to its final thickness,with no notable changes in internal structure or fundamental mechanical properties.关键词
双基片状药/压延/塑化/内部结构/力学性能Key words
double-base flake gun propellant/pressing/plasticization/internal structure/mechanical properties分类
军事科技
