Niobium powder-added energetic material for cutting and preparation method thereof

Abstract

The invention discloses a niobium powder added energetic material for cutting and a preparation method. The energetic material is prepared from the following components in percentage by weight: 2 to 25 weight percent of niobium powder, 15 to 35 weight percent of a reducing agent, 30 to 65 weight percent of an oxidizing agent, 10 to 25 weight percent of a gas generating agent and 2 to 10 weight percent of a binding agent. The niobium powder is added, so that the combustion energy density of the energetic material is high. After the energetic material is loaded into a cutting tool, formed combustion jet flow is good in cutting quality on a target plate, the cutting depth is large, and the cutting diameter is large.

Description

Technical Field

[0001] The invention relates to an energetic material for cutting added with niobium powder and a preparation method thereof. Background Art

[0002] Energetic materials are metastable substances that can undergo chemical reactions under certain conditions to release a large amount of energy. Energetic materials can be divided into different types according to specific performance indicators and application fields. Among them, energetic materials used for combustion and cutting purposes have a high energy density and a controllable combustion rate. They can form high-temperature products during the combustion reaction process. When they are sprayed onto the surface of an object, they can produce continuous ablation and impact effects, thereby achieving the purpose of cutting the object. The combustion and cutting technology using such energetic materials is simple to operate, convenient to transport, and safe to use. Its energy source is the combustion reaction of the energetic material. No external electricity or power device is required. It is widely used in cutting operations in various special environments, such as field rescue, emergency rescue, and ammunition destruction.

[0003] Common energetic materials for cutting mostly use Al and Mg powder as reducing agents, metal oxides as oxidants, and fluoropolymers as gas generating agents or binders. In addition, metal single substance particles such as W and Ni can be added to the energetic materials for cutting as cutting agents to enhance the jet kinetic energy of the combustion reaction jet and improve the cutting effect. Since the reaction temperature of the combustion process of energetic materials is relatively high, the combustion reaction temperature can exceed 2000°C, which exceeds the melting point or boiling point of many metals. Some of the added cutting agent particles will significantly weaken the cutting performance of the energetic materials after melting or gasification. Although the melting point and boiling point of tungsten powder are relatively high, the addition of tungsten powder will easily lead to a significant decrease in the combustion reaction rate and combustion energy density, which will seriously weaken the cutting effect of the energetic materials. Summary of the invention

[0004] The present invention provides an energetic material for cutting with niobium powder added and a preparation method. The present invention can solve the problem that the existing energetic materials have poor combustion and cutting effects. The density of niobium powder is 8.57 g / cm 3 , melting point is 2468℃, boiling point is 4742℃. The energetic material with niobium powder added has high reaction temperature and fast reaction rate during combustion process. In the high temperature jet formed by cutting tool, the added niobium powder can give full play to its penetration and cutting efficiency, and obtain deeper cutting depth or larger cutting aperture.

[0005] The technical solutions adopted in the present invention are: An energetic material for cutting with niobium powder added comprises the following components: 2-25 wt.% of niobium powder, 15-35 wt.% of a reducing agent, 30-65 wt.% of an oxidizing agent, 10-25 wt.% of a gas generating agent, and 2-10 wt.% of a binder.

[0006] Furthermore, the diameter of the niobium powder is 1 to 35 microns.

[0007] Furthermore, the reducing agent has a diameter of 1 to 25 micrometers and includes at least one of aluminum powder and magnesium powder.

[0008] Furthermore, the diameter of the oxidant is 1 to 25 microns, and includes at least one of CuO powder, MnO2 powder, and Fe2O3 powder.

[0009] Furthermore, the diameter of the gas generating agent is 15 to 50 microns, and includes at least one of PTFE powder and PVDF powder.

[0010] Furthermore, the adhesive is fluororubber or epoxy resin.

[0011] The present invention also discloses a method for preparing the above material, comprising the following steps: (1) First, the reducing agent, the oxidizing agent, and the gas generating agent are ball-milled and mixed to obtain a mixed powder; (2) adding niobium powder to the mixed powder, adding a binder solution, and then mixing them evenly to obtain a slurry; (3) The slurry is dried to volatilize the solvent, granulated after drying, and then sieved and separated to obtain energetic material powder for cutting with niobium powder added.

[0012] Furthermore, in the binder solution, the solvent is acetone or ethyl acetate, and the concentration of the binder in the solution is 2-20 g / L.

[0013] The present invention has the following beneficial effects: The addition of niobium powder makes the combustion energy density of the energetic material high. After the energetic material is loaded into the cutting tool, the combustion jet formed has good cutting quality, deep cutting depth and large cutting diameter for the target plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram showing the cutting effect of the energetic material for cutting with niobium powder added in Example 1 on a steel plate.

[0015] Figure 2 This is a diagram showing the cutting effect of the steel plate by the energetic material with tungsten powder added in Comparative Example 1. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings. Example 1

[0017] The energetic material raw materials were weighed according to the following formula: 22.5 wt.% aluminum powder, 50.5 wt.% Fe2O3 powder, 15 wt.% PTFE powder, 2 wt.% fluororubber and 10 wt.% niobium powder.

[0018] Place aluminum powder, Fe2O3 powder and PTFE powder in a ball mill with a ball-to-material ratio of 1:1, and mix at a rotation speed of 150 rpm for 60 minutes.

[0019] Add niobium powder to the above ball mill jar, add steel balls of the same mass as the niobium powder, and add acetone solution containing fluororubber, the concentration of fluororubber in the solution is 5 g / L, and continue mixing on the ball mill for 60 minutes at a speed of 300 rpm.

[0020] After the mixing is completed, the liquid-solid blended slurry of the energetic material is poured into a tray, the acetone is completely volatilized in a blast drying oven, and then dried at 70°C and granulated, and the powder is separated from the steel ball by sieving to obtain the energetic material powder for cutting. The calorimeter is used to measure the combustion heat value of the energetic material in an argon environment to be about 3.7 KJ / g.

[0021] Subsequently, a certain amount of the above powder was weighed and placed in a cylindrical mold for cold pressing. The molding pressure was 120 MPa and the pressure was maintained for 10 minutes. After the mold was opened, a niobium-containing energetic material column was obtained. The column was loaded into a cutting tool, and its cutting effect on the steel plate was as follows: Figure 1 As shown, the cutting effect is good, and the average diameter of the cutting holes is about 9.8 mm. Comparative Example 1

[0022] The energetic material raw materials were weighed according to the following formula: 22.5 wt.% aluminum powder, 50.5 wt.% Fe2O3 powder, 15 wt.% PTFE, 2 wt.% fluororubber and 10 wt.% tungsten powder.

[0023] Place aluminum powder, Fe2O3 powder and PTFE powder in a ball mill with a ball-to-material ratio of 1:1, and mix at a rotation speed of 150 rpm for 60 minutes.

[0024] Add tungsten powder to the above ball mill jar, add steel balls of the same mass as the tungsten powder, and add acetone solution containing fluororubber, the concentration of fluororubber in the solution is 5 g / L, and continue mixing on the ball mill for 60 minutes at a speed of 300 rpm.

[0025] After the mixing is completed, the liquid-solid blended slurry of the energetic material is poured into a tray, the acetone solvent is completely volatilized in a blast drying oven, and then dried at 70°C and granulated, and the powder is separated from the steel ball by sieving to obtain the energetic material powder for cutting. The calorimeter is used to measure the combustion heat value of the energetic material in an argon environment to be about 2.8 KJ / g.

[0026] Subsequently, a certain amount of the above powder was weighed and placed in a cylindrical mold for cold pressing. The molding pressure was 120 MPa and the pressure was maintained for 10 minutes. After the mold was opened, a tungsten-containing energetic material column was obtained. The column was loaded into a cutting tool, and its cutting effect on the steel plate was as follows: Figure 2 As shown, the cutting effect is poor, and the average diameter of the cutting perforation is about 5.6 mm.

[0027] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. An energetic material for cutting with niobium powder added, characterized in that: The composition comprises the following contents: 2-25 wt.% of niobium powder, 15-35 wt.% of reducing agent, 30-65 wt.% of oxidizing agent, 10-25 wt.% of gas generating agent, and 2-10 wt.% of binder.

2. The energetic material for cutting with niobium powder added and the preparation method thereof as claimed in claim 1, characterized in that: The diameter of the niobium powder is 1 to 35 microns.

3. The energetic material for cutting with niobium powder added and the preparation method thereof as claimed in claim 1, characterized in that: The reducing agent has a diameter of 1 to 25 microns and includes at least one of aluminum powder and magnesium powder.

4. The energetic material for cutting with niobium powder added and the preparation method thereof as claimed in claim 1, characterized in that: The diameter of the oxidant is 1 to 25 microns, and includes at least one of CuO powder, MnO2 powder, and Fe2O3 powder.

5. The energetic material for cutting with niobium powder added and the preparation method thereof as claimed in claim 1, characterized in that: The gas generating agent has a diameter of 15 to 50 microns and includes at least one of PTFE powder and PVDF powder.

6. The energetic material for cutting with niobium powder added and the preparation method thereof as claimed in claim 1, characterized in that: The adhesive is fluororubber or epoxy resin.

7. A method for preparing the material according to any one of claims 1 to 6, characterized in that: The steps include: (1) First, the reducing agent, the oxidizing agent, and the gas generating agent are ball-milled and mixed to obtain a mixed powder; (2) adding niobium powder to the mixed powder, adding a binder solution, and then mixing them evenly to obtain a slurry; (3) The slurry is dried to volatilize the solvent, granulated after drying, and then sieved and separated to obtain energetic material powder for cutting with niobium powder added.

8. The method for preparing the energetic material for cutting with niobium powder added as claimed in claim 7, characterized in that: In the binder solution, the solvent is acetone or ethyl acetate, and the concentration of the binder in the solution is 2-20 g / L.

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