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High-activity aluminum powder combustion heat measurement method

A measurement method and combustion heat technology, applied in the direction of material heat development, etc., can solve the problems of incomplete combustion, aluminum powder prone to agglomeration, ablation, etc., to avoid damage to the instrument, ensure the safety and smoothness of the experiment, and reduce the combustion rate Effect

Inactive Publication Date: 2016-05-25
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems in testing the heat of combustion of aluminum powder with this traditional calorimeter test method: (1) the combustion process of aluminum powder is extremely prone to agglomeration, accumulation, condensation, etc., and incomplete combustion will occur when it is directly ignited, resulting in The test results are unstable and the repeatability is poor; (2) The high-activity aluminum powder is different from ordinary propellants due to its powder form, and deflagration will occur at the moment of ignition, which will cause the pressure inside the oxygen bomb to rise instantaneously, and at the same time the instantaneous high temperature It will also cause ablation phenomenon, unable to obtain valid data, and also cause damage to experimental instrument components

Method used

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Experimental program
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Effect test

Embodiment 1

[0014] Use benzoic acid to calibrate the calorimetric system of the oxygen bomb calorimeter for many times, take the average value of 5 test results with a range not exceeding 40J / K as the heat capacity of the system, and obtain E=14511.2J / K; put the newly opened Aluminum powder (50nm, active aluminum content 82%) and GAP were uniformly mixed according to 1:3 (mass ratio) for sample preparation, and 0.2501g of burning sample was weighed and placed in a calorimeter bomb, filled with excess oxygen, and then the amount Put the heat bomb in a certain amount of water, let the sample burn in the calorimeter bomb, and accurately measure the temperature rise value of the water (T n -T 0 ); then follow the formula Calculate the heat of combustion of aluminum powder. The oxygenation pressure is 1.5MPa. Take the average value of the two groups of tests as the heat of combustion of the aluminum powder, and the results are shown in Table 1.

Embodiment 2

[0016] Use benzoic acid to calibrate the calorimetric system of the oxygen bomb calorimeter for many times, take the average value of 5 test results with a range not exceeding 40J / K as the heat capacity of the system, and obtain E=14511.2J / K; put the newly opened Aluminum powder (50nm, active aluminum content 82%) and GAP were uniformly mixed according to 1:4 (mass ratio) for sample preparation, weighed 0.2504g of burning sample and placed it in a calorimeter bomb, filled with excess oxygen, and then weighed Put the heat bomb in a certain amount of water, let the sample burn in the calorimeter bomb, and accurately measure the temperature rise value of the water (T n -T 0 ); then follow the formula Calculate the heat of combustion of aluminum powder. The oxygenation pressure is 1.5MPa. Take the average value of the three groups of tests as the heat of combustion of the aluminum powder, and the results are shown in Table 1.

Embodiment 3

[0018] Use benzoic acid to calibrate the calorimetric system of the oxygen bomb calorimeter multiple times, take the average value of the 5 test results with a range not exceeding 40J / K as the heat capacity of the system, and obtain E=14511.2J / K; put the newly opened Aluminum powder (50nm, active aluminum content 82%) and GAP were uniformly mixed according to 1:4 (mass ratio) for sample preparation, and 0.3019g of burning sample was weighed and placed in a calorimeter bomb, filled with excess oxygen, and then the amount Put the heat bomb in a certain amount of water, let the sample burn in the calorimeter bomb, and accurately measure the temperature rise value of the water (T n -T 0 ); then follow the formula Calculate the heat of combustion of aluminum powder. The oxygenation pressure is 1.5MPa. Take the average value of the three groups of tests as the heat of combustion of the aluminum powder, and the results are shown in Table 1.

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Abstract

The invention discloses a high-activity aluminum powder combustion heat measurement method. The method includes the following steps of firstly, calibrating a heat metering system of an oxygen bomb calorimeter through benzoic acid so as to obtain the thermal capacity of the system; secondly, mixing aluminum powder with glycidyl azide polymer (GAP) to form a sample; thirdly, weighing the mixed combustion sample, putting the sample in a calorimetric bomb, introducing oxygen, putting the calorimetric bomb in water, making the sample combust in the calorimetric bomb, and accurately measuring the water temperature values before and after combustion; fourthly, calculating the combustion heat value of aluminum powder according to the formula. The method is high in accuracy, safe and feasible, and the experiment basis is provided for thermodynamic calculation and formulation design of aluminum-contained propellant.

Description

technical field [0001] The invention relates to a method for measuring the heat of combustion of a substance, which is suitable for measuring the heat of combustion of high-activity aluminum powder. Background technique [0002] Due to its high combustion calorific value, micro / nano aluminum powder is often used as a high-energy metal combustion agent for rocket propellants. It not only improves the burning rate of solid propellants, increases the specific impulse, but also reduces the pressure index. Aluminum powder is easily oxidized in air to form Al 2 o 3 , the chemical potential (combustion heat) of the aluminum powder whose surface is oxidized is also reduced, and there are differences in the combustion heat of aluminum powder obtained by different particle sizes, shapes and preparation processes. If only theoretical values ​​are used, there are often large errors. This also brings great difficulties to the thermodynamic calculation and formula design of aluminum-con...

Claims

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Application Information

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IPC IPC(8): G01N25/26G01N25/44
CPCG01N25/26G01N25/44
Inventor 姜菡雨赵凤起孙志华徐司雨裴庆杨九冰李猛郝海霞姚二岗
Owner XIAN MODERN CHEM RES INST
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