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Preparation method of aluminum-cladding boron composite powder

A composite powder, aluminum coating technology, used in sputtering coating, ion implantation coating, vacuum evaporation coating and other directions, can solve problems such as difficulty, uneven coating structure, difficult melting and gasification, etc. short time effect

Inactive Publication Date: 2010-07-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are the following three problems: (1) The melting point and boiling point of elemental boron are relatively high, greater than 2000 ° C, which is difficult to melt and gasify; the boiling point of boron oxide is also very high, which determines that the temperature must reach more than 2000 ° C to make boron particles Ignite and burn, and the combustion process will go through B 2 0 3 The evaporation of the oxide layer further increases the difficulty of ignition and combustion of boron particles
We believe that the main reason is that the coating structure obtained by ball milling is not uniform, and some even have no coating at all.

Method used

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  • Preparation method of aluminum-cladding boron composite powder
  • Preparation method of aluminum-cladding boron composite powder
  • Preparation method of aluminum-cladding boron composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as Figure 7 Shown, a kind of preparation method of aluminum-coated boron composite powder, it comprises the steps:

[0037] Take 3 kg of granulated boron powder with a particle size of 50-80 μm, and then put it into the feeding hopper of the multi-arc ion coating machine. Set the feeding speed to 15g / min, the total coating time to 200 minutes, set the rotating speed of the loading platform to 3 rpm, the vibration frequency to 18 times / min, and the coating time to 5-8 minutes for the powder monomer. The target material in the vacuum furnace body of the multi-arc ion coating machine is an aluminum target. Vacuum to 2.0×10 -2 Pa, firstly clean the target (argon to 2Pa, 5min), and then evacuate to 2.0×10 -2 Pa. The vacuum furnace body is heated to a coating temperature of 200°C. Then filled with argon to 2.5×10 -1 Pa, the current of the argon emission source (that is, the arc source) is 60A (the voltage is passively adjusted with the current and air pressure). ...

Embodiment 2

[0039] A method for preparing an aluminum-coated boron composite powder, comprising the steps of:

[0040] Take 6 kg of granulated boron powder with a particle size of 30-50 μm, and then put it into the feeding hopper of the multi-arc ion coating machine. Set the feeding speed to 15g / min, the total coating time to 400 minutes, set the rotating speed of the loading platform to 4 rpm, the vibration frequency to 24 times / min, and the coating time to 3 to 4 minutes for the powder monomer. The target material in the vacuum furnace body of the multi-arc ion coating machine is an aluminum target. Vacuum to 2.0×10 -2 Pa. Firstly, the target is cleaned (pass argon to 2Pa, 5min), and then vacuumize to 2.0×10 -2 Pa. The vacuum furnace body is heated to a coating temperature of 180°C. Then filled with argon to 2.5×10 -1 Pa, the current of the argon emission source (that is, the arc source) is 55A (the voltage is passively adjusted with the current and air pressure). The granulated ...

Embodiment 3

[0042] A method for preparing an aluminum-coated boron composite powder, comprising the steps of:

[0043] Take 10 kg of granulated boron powder with a particle size of 80-100 μm, and then put it into the feeding hopper of the multi-arc ion coating machine. Set the feeding speed to 20g / min, the total coating time to 500 minutes, set the rotating speed of the carrying table to 2 rpm, the vibration frequency to 6 times / min, and the coating time to 8-10 minutes for the powder monomer. The target material in the vacuum furnace body of the multi-arc ion coating machine is an aluminum target. Vacuum to 2.0×10 -2 Pa, firstly clean the target (argon to 2Pa, 5min), and then evacuate to 2.0×10 -2 Pa. The vacuum furnace body is heated to a coating temperature of 170°C. Then filled with argon to 2.5×10 -1 Pa, the current of the argon emission source (that is, the arc source) is 70A (the voltage is passively adjusted with the current and air pressure). The granulated boron powder fal...

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Abstract

The invention relates to a preparation method of an aluminum-cladding boron composite powder, which is characterized by comprising the following steps: (1) pretreating boron powder; (2) carrying out multi-arc aluminizing treatment on the surface of the pretreated boron powder in a multi-arc ion-plating machine by adopting a multi-arc ion-plating technology to obtain the aluminum-cladding boron composite powder; parameters of the multi-arc ion-plating technology comprise the following: selecting an aluminum target as a target; firstly, vacuumizing to 2.0*10<-2>Pa; secondly, introducing argon gas to (2.5-3.3)*10<-1>Pa; ensuring the current of an argon transmitting source is 55-70A and the film-plating temperature is 170-200DEG C; thirdly, feeding pretreated boron powder into a bearing platform positioned in a vacuum furnace body at the feeding speed of 5-20g / min; enabling powder particles to jump or roll from one step to another step of the bearing platform by rotating and vibrating; and finally enabling the powder particles to fall into a powder collection device. The invention has the advantages of short membrane-plating time, uniform cladding, simple process and suitability for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of aluminum-coated boron composite powder. Background technique [0002] Boron as a high-energy fuel component has attracted great interest since the 1950s. But there are the following three problems: (1) The melting point and boiling point of elemental boron are relatively high, greater than 2000 ° C, which is difficult to melt and gasify; the boiling point of boron oxide is also very high, which determines that the temperature must reach more than 2000 ° C to make boron particles Ignite and burn, and the combustion process will go through B 2 0 3 The evaporation of the oxide layer further increases the difficulty of boron particle ignition and combustion. The ignition and combustion of boron particles with an average particle size of 2 μm takes 11ms; (2) boron has low combustion efficiency, high oxygen consumption, and produces a lot of residues, which cannot exert its high energy calorific value; (3) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/22C23C14/16C06B27/00
Inventor 张东明贺振华张联盟
Owner WUHAN UNIV OF TECH
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