共查询到18条相似文献,搜索用时 218 毫秒
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用TG、5s爆发点和单向拉伸试验,研究了湿热环境对RDX/AP-NEPE推进剂热安全性和力学性能的影响。结果表明,在相对湿度70%、温度75℃下经历6d的湿热老化后,RDX/AP-NEPE推进剂在TG曲线上的3个质量损失阶段的表观活化能均略有降低,水分对AP分解活化能的影响较为明显,使其活化能降低9.3%。湿热老化前后,5s爆发点Tb分别为303.7℃和302.7℃。随着老化时间的增加,延伸率和抗拉强度都呈降低趋势,至第6d延伸率从106.0%降至36.7%,抗拉强度从0.631MPa降至0.541MPa。在75℃下干燥热老化6d后,RDX/AP-NEPE推进剂3个阶段的表观活化能、5s爆发点、抗拉强度和延伸率都没有明显的变化。初期老化过程中,水分对RDX/AP-NEPE推进剂的力学性能和AP的分解活化能影响较大,但对热感度基本没有影响。 相似文献
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采用国产ZRY-1型综合热分析仪测定雷汞,特屈拉辛,二硝基重氮酚的爆发点。分别比较不同加热速率,不同试样重量和不同粒度条件下与爆发点的关系,与现行标准测定方法相比较,该法具有简便,准确,精度高等优点。 相似文献
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以温度为函数的硝仿系炸药的爆发分解反应动力学参数 总被引:2,自引:0,他引:2
用爆发点试验装置测定了6种硝仿系炸药:2,2,2-三硝基乙基-N-硝基-甲胺(TNMA)、二(2,2,2-三硝基乙基-N-硝基)乙二胺(BTNEDA)、4,4,4-三硝基丁酸-2,2,2-三硝基乙酯(TNETB)、二(2,2,2-三硝基乙醇)缩甲醛(BTNF)、1,1,1,3-四硝基丙烷(TETNP)和二(2,2,2-三硝基乙基)硝胺(BTNNA)在不同温度下的爆发延滞期.依据谢苗诺夫方程lnt_(lag,i)=E_α/RT_i-lnA_α,由lnt_(lag,i)对1/T_i的关系,用作图法和最小二乘法计算了爆发分解反应的表观活化能(E_α)、指前因子(A_α)和5 s爆发点.用非线性等转化率积分法所得的表观活化能(E_α)校验了由lnt_(lag,i)~1/_Ti关系得到的Eα值.借助热力学关系式,计算了爆发分解反应的活化热力学参数[活化自由能(ΔG≠),活化焓(ΔH≠)和活化熵(ΔS≠)].结果表明: (1) E_α和作图法所得E_α间的相对误差在±5%以内; (2) E_α与最小二乘法所得E_α相等的事实佐证了不同温度下爆发分解反应延滞期内的分解深度是相等的,所得E_α和A_α值是可接受的,谢苗诺夫方程推导过程中采用A_α>>G(α)的假设是合理的; (3) 以5 s爆发点和ΔG~#为判据,6种硝仿系炸药对热抵抗能力的次序为:TNETB>BTNF>BTNEDA>TETNP>TNMA>BTNNA. 相似文献
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利用双辊混炼机制备了共混型阻燃聚丙烯(PP)材料,并用热重(TG-DTG)方法研究了PP、PP/MPP和PP/MPP/PER在N2气氛下以不同升温速度时的热降解动力学行为,以此探讨阻燃性能与热降解行为的关系.试验发现,加入阻燃剂后材料的初始分解温度提前;利用Kissinger法和Flynn-Wall法求取了材料的活化能,发现两种方法求取的结果相一致,并且添加阻燃剂后,材料的活化能明显提高;热降解残留物的红外光谱分析结果表明MPP复配PER后,保留了更多的PP特征峰;说明阻燃剂提前分解成炭、隔热、隔氧,阻止了PP的进一步氧化分解;材料的寿命分析发现,添加阻燃剂后,材料的热寿命都明显提高. 相似文献
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Methods for determining the heat of explosion of high explosives (HEs) with ideal and nonideal processes of explosive decomposition
are considered. It is shown that the heat of explosion is of significance for estimating the efficiency of commercial HEs
and is used in the energetic characterization of the working capacity. The heat of explosion of brisant HEs is only part of
the blast heat of explosion and is the heat content of gaseous detonation products during their isentropic expansion from
the initial state to a certain expansion ratio (determined by experimental conditions). The heat of explosion can be obtained
by thermodynamic calculations based on physically justified equations of state for fluids (gaseous detonation products in
the chemical-reaction zone of the detonation wave in the supercritical state) and condensed nanocarbon phases (nanographite,
nanodiamond, and liquid carbon). Experimental and calculated values of the heat of explosion are given. The thermodynamic
calculation is inapplicable to commercial HEs because of the nonideal nature of their detonation. The heat of explosion of
commercial HEs can be calculated using the Hess law. The heat of explosion of brisant HEs is not a measure of power. The power
of HEs is characterized by the propellant performance. It is shown that even detonation velocity cannot be a measure of the
power of HEs. The power and detonation parameters of brisant HEs are determined by the energy release density in unit volume
of the chemical-reaction zone of the detonation wave and by the rate of energy release from the shock front rather than by
the heat of explosion, which cannot be considered a universal characteristic.
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Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 2, pp. 100–107, March–April, 2007. 相似文献
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A. N. Afanasenkov 《Combustion, Explosion, and Shock Waves》2004,40(1):119-125
A simple formula for calculating the absolute strength of an explosives as determined by the Trauzl test (expansion in a lead block) is proposed that contains only one parameter — the relative strength of the explosive calculated from the heat of explosion and the volume of explosion gases. 相似文献
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火药爆热热量计检定用标准物质的研制 总被引:3,自引:2,他引:1
采用硝化棉、硝化甘油、中定剂和凡士林为火药爆热热量计检定用标准物质的组成成分,通过生产工艺优化制备出该标准物质。对标准物质特性量值(爆热值)的均匀性采用方差分析方法进行检验,并进行1a以上的稳定性考核,并且通过定值、定值结果的不确定度分析以及在不同单位火药爆热热量计上的试用表明,该标准物质特性量值准确、可靠,均匀性和稳定性好,可以达到火药爆热量值传递以及校准和检定火药爆热测试仪器的要求。 相似文献
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B. D. Khristoforov 《Combustion, Explosion, and Shock Waves》2004,40(6):714-719
Results of an experimental study of parameters of the shock wave and explosion products in the near zone of explosions in air and water with a wide range of variation of explosion heat and charge density of high explosives are presented. It is shown that the influence of these characteristics on the action of explosions in the near zone can be characterized by one parameter: volume concentration of energy in the source. A change in this parameter involves a significant redistribution of energy between the explosion products and the shock wave, which can affect brisance and violate the energy similarity of explosions. 相似文献
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研究了充氮法测量双基发射药爆热过程中充氮净化次数、充氮压力以及样品用量等因素对爆热值的影响。结果表明,随着氧弹中氮气净化次数的增加,爆热值由大变小并趋于稳定,净化两次以上时,对爆热值的测量不会发生影响;充氮气时,应保证充氮压力大于临界压力,同时控制每次充氮压力值的一致性,当充氮压力大于2.5M Pa时,对爆热值的测量不会发生影响;在确定被测样品实验用量时,应尽可能使样品燃烧后热量计产生的温升值与在热容量标定时标准物质燃烧后产生的温升值相当,样品质量为5.430 g时,爆热值的测量系统误差最小。 相似文献
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Gerhard Krause 《Propellants, Explosives, Pyrotechnics》2012,37(1):107-115
In this paper the differential equation of thermal explosion in the steady‐state approximation is established and solved. This solution is based on Fourier’s heat equation along with the Arrhenius heat source. The theory allows to draw conclusions on the thermal behaviour of any substance. The critical ambient temperature appears as a function of the apparent activation energy, Arrhenius temperature rate, temperature diffusivity, and the volume. The thermal stability of a chemically reactive material may be determined by means of these dependencies. Different volumes of five explosive materials were exposed to hot storage tests. These experiments generate appropriate kinetic parameters for these materials that are compared with known values from literature. Once these parameters are known, self‐ignition temperatures can be calculated for any arbitrary volume and boundary conditions. This is of major importance in the safe transportation and storage of explosives, munitions, and weapons. 相似文献
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DNTF基含硼和含铝炸药的水下能量 总被引:1,自引:0,他引:1
理论计算了DNTF基含硼和含铝炸药的爆炸性能参数,通过水下能量及爆热测试研究了它们的能量特性。结果表明,含硼质量分数15%的DNTF基炸药水下能量可达到2.1倍TNT当量,并出现最大值。含铝质量分数10%-50%的DNTF基炸药的水下能量随铝含量的增加呈上升趋势,其最大值可达到2.67倍TNT当量。当铅或硼的质量分数低于18%时,含硼DNTF炸药的能量高于含铝炸药。硼铝联用,也可获得较好的能量特性。 相似文献