Avrami Model for the Construction Process of Nitro Gradiently Distributed Single-base Propellant

doi:10.12382/bgxb.2023.1190

Abstract

Abstract:

Nitro gradiently distributed propellant is a kind of environmentally friendly smokeless propellant.The controllable construction of its structure is a complex physicochemical process,which is the key to determine the combustion performance of propellant.In order to study the kinetics of reaction process of nitro gradiently distributed propellant during preparation,the cylindrical granular single-base propellant sample was used as the research object, which density was tested by the liquid static weighing method.The influence rules of denitration reaction temperature and reaction liquid concentration on the denitration rate were investigated.The control steps of the reaction process were studied by using the Avrami model,and a reaction kinetics equation was established.The experimental results showed that the bigger the degree of denitration of the cylindrical granular single-base propellant sample was,the smaller its density was.The denitration reaction process of cylindrical granular single-base propellant was consistent with the Avrami model of n=0.816,the apparent activation energy was 49.223kJ/mol,the apparent reaction order of the reaction liquid concentration was 1.028,and the denitration reaction process was controlled by the mixture of diffusion and chemical reaction.Therefore,the chemical reaction effect or diffusion effect can be strengthened to improve the denitration rate of the cylindrical granular single-base propellant.This study provides a theoretical basis for the establishment of productive process conditions for nitro gradiently distributed propellant.

Key words: nitro gradiently distributed propellant, control step, Avrami model, kinetic equation

CLC Number:

Q562⁺.21

FAN Honglei, CUI Fan, LI Yang, LI Shiying, CHEN Chunlin, LI Chunzhi, WANG Xiaoqian, XIAO Zhongliang, WU Xiaoqing. Avrami Model for the Construction Process of Nitro Gradiently Distributed Single-base Propellant[J]. Acta Armamentarii, 2025, 46(1): 231190-.

Figures/Tables 10

References 25

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样品	反应条件			ρ/ (g·cm^-3)	α/%
样品	C/%	T'/℃	t/min	ρ/ (g·cm^-3)	α/%
原样				1.602	0
样品1	9	70	90	1.594	5.668
样品2	9	70	120	1.587	7.564
样品3	12	70	90	1.581	9.124
样品4	9	80	120	1.574	12.840

样品	反应条件			ρ/ (g·cm^-3)	α/%
样品	C/%	T'/℃	t/min	ρ/ (g·cm^-3)	α/%
原样				1.602	0
样品1	9	70	90	1.594	5.668
样品2	9	70	120	1.587	7.564
样品3	12	70	90	1.581	9.124
样品4	9	80	120	1.574	12.840

拟合曲线编号	C/%	T'/℃	拟合关系	R²
1	6	65	-ln(1-α)=5.196×10^-4t^0.908	0.993
2	6	70	-ln(1-α)=3.597×10^-4t^1.067	0.982
3	6	75	-ln(1-α)=6.453×10^-4t^0.967	0.989
4	6	80	-ln(1-α)=1.730×10^-3t^0.824	0.979
5	9	65	-ln(1-α)=2.510×10^-3t^0.688	0.982
6	9	70	-ln(1-α)=1.290×10^-3t^0.865	0.963
7	9	75	-ln(1-α)=2.640×10^-3t^0.785	0.973
8	9	80	-ln(1-α)=5.950×10^-3t^0.657	0.990
9	12	65	-ln(1-α)=2.490×10^-3t^0.734	0.997
10	12	70	-ln(1-α)=2.240×10^-3t^0.829	0.997
11	12	75	-ln(1-α)=3.680×10^-3t^0.774	0.998
12	12	80	-ln(1-α)=9.920×10^-3t^0.595	0.985
13	15	65	-ln(1-α)=1.720×10^-3t^0.863	0.996
14	15	70	-ln(1-α)=2.350×10^-3t^0.868	0.995

拟合曲线编号	C/%	T'/℃	拟合关系	R²
1	6	65	-ln(1-α)=5.196×10^-4t^0.908	0.993
2	6	70	-ln(1-α)=3.597×10^-4t^1.067	0.982
3	6	75	-ln(1-α)=6.453×10^-4t^0.967	0.989
4	6	80	-ln(1-α)=1.730×10^-3t^0.824	0.979
5	9	65	-ln(1-α)=2.510×10^-3t^0.688	0.982
6	9	70	-ln(1-α)=1.290×10^-3t^0.865	0.963
7	9	75	-ln(1-α)=2.640×10^-3t^0.785	0.973
8	9	80	-ln(1-α)=5.950×10^-3t^0.657	0.990
9	12	65	-ln(1-α)=2.490×10^-3t^0.734	0.997
10	12	70	-ln(1-α)=2.240×10^-3t^0.829	0.997
11	12	75	-ln(1-α)=3.680×10^-3t^0.774	0.998
12	12	80	-ln(1-α)=9.920×10^-3t^0.595	0.985
13	15	65	-ln(1-α)=1.720×10^-3t^0.863	0.996
14	15	70	-ln(1-α)=2.350×10^-3t^0.868	0.995