Sample preparation toolkit for determining curing temperature of high-solid-content propellant powder and use method of sample preparation toolkit

Abstract

The invention discloses a sample preparation toolkit for determining the curing temperature of a high-solid-content propellant powder and a use method of the sample preparation toolkit. The high-solid-content propellant powder is cylindrical propellant powder with the solid filler mass fraction of 54%, the diameter of 14 mm and the height of 15 mm, and the sample preparation tool kit comprises a sample preparation knife, a sample preparation cover, a sample preparation disc and a hammer. Each propellant grain is split into two halves along the axis by using a sample preparation toolkit, the two halves are cured for 0-5 days at 80 DEG C, 90 DEG C and 100 DEG C respectively, an elastic modulus average value E and a standard deviation delta are calculated through multi-point detection by using a nanoindentor, and alpha = E * 4 + delta * 6; recording corresponding time tmin when alpha reaches the minimum value at the same temperature, and enabling delta to be equal to tmin-3; delta at the three temperatures of 80 DEG C, 90 DEG C and 100 DEG C is compared, and the temperature corresponding to the minimum value of delta is the optimal curing temperature. When the sample preparation toolkit is used for sample preparation, the loss is small, the potential safety hazard is small, the sample preparation time is short, the sample preparation repeatability is good, and the influence on a detection result is small.

Description

technical field [0001] The invention belongs to the field of propellant physical and chemical performance detection and research, and mainly relates to the development of sample preparation (sample processing) tools for propellant samples to be tested, especially the sample preparation tools for cylindrical high-solid-content propellant samples used to determine the curing temperature development. Background technique [0002] Nitrocellulose NC is used as the energy part and binder in the propellant. NC is a rigid linear polymer, adding plasticizer can effectively improve the flexibility of NC molecular chain, increase its plasticity, improve processing and mechanical properties. Nitroglycerin NG is often used for plasticizing NC. The propellant composed of NC and NG is called double-base propellant. When the double-base propellant is used to launch the charge of the artillery, it has a greater ablative effect on the gun bore, and there are more flames and smoke. In order...

AI Technical Summary

Problems solved by technology

[0011] The high solid content propellant has a diameter of 14mm and a height of 15mm. The formed powder column will be slightly deformed, it is not easy to "stand firmly", and it is often tilted during the "split" operation, and the knife edge slips, so the powder column cannot be split into pieces more even halves

Therefore, there are many spent powder columns, resulting in a large loss of sample preparation.

[0012] (2) Big potential safety hazard

[0013] Propellants with high solid content are harder and more brittle, and the fragments after splitting will collapse everywhere. If they just collapse into the cracks in the ground and are not cleaned up in time, it will be a big safety hazard

In addition, due to the large loss of sample preparation, more unshaped propellants need to be produced, which will also bring potential safety hazards

[0014] (3) Long sample preparation time

[0015] Due to the fact that the powder column is often skewed, the success rate of sample preparation is low, and the subsequent cleaning is caused by collapse and splashing, etc., it takes a long time for sample preparation

[0016] (4) The repeatability of sample preparation is poor, which has a great influence on the test results

[0017] It is difficult to control the strength of manual "split" and the degree of damage to the powder column, which may change the NC state in the sample and affect the accuracy of the test results

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