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Production process of amorphous boron powder

A technology of amorphous boron powder and production process, applied in the direction of boron, boron/boride, etc., can solve the problems of low purity, many unsafe factors, only 90-92%, etc., and achieve high purity and good combustion performance. Effect

Active Publication Date: 2016-04-20
上海九鼎粉体材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnesia thermal reduction process is based on B 2 o 3 After mixed with Mg in a certain proportion, a high-temperature thermal reduction reaction is carried out. The amorphous boron obtained at high temperature is easily further oxidized, resulting in low purity. However, the secondary reduction of the prepared crude boron and Mg powder, due to the heat value of the secondary reaction It is relatively low and requires electric heating to maintain the reaction, and the purity is only 90-92%; this process has many unsafe factors, and it is easy to generate boron-magnesium compound impurities

Method used

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  • Production process of amorphous boron powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of amorphous boron powder:

[0043] 1. Preparation of magnesium shavings: take magnesium ingot (No. 0), and use a planer to make (width 5-8mm, length 20-50mm, thickness 0.1-0.2mm.) shavings

[0044] 2. Preparation of boric anhydride powder: 1) take boric acid (analytical pure), adopt molybdenum disk and vacuum muffle furnace, melt and dehydrate; 2) ball mill into powder after crushing, particle size is less than 0.2mm; 3) boric anhydride powder is placed in Store in a dry bottle.

[0045] 3. Loading: 300g / part of boron anhydride, 100g / part of magnesium shavings, in the molybdenum pan, the bottom layer is boric anhydride, then spread magnesium shavings, layer by layer, until 80% full.

[0046] 4. Vacuum muffle furnace: Preheat to 1100°C and stabilize for 30 minutes.

[0047] 5. Reaction: Place the molybdenum disk with the raw materials in the above-mentioned vacuum muffle furnace, and evacuate to 10 -5 Pa, start the thermal reduction reaction; when it is o...

Embodiment 2

[0069] Preparation of amorphous boron powder:

[0070] 1. Preparation of magnesium shavings: take magnesium ingot (0#), and use a planer to make shavings (width 5-8mm, length 5-15mm, thickness 0.5mm)

[0071] 2. Preparation of boric anhydride powder: 1) take boric acid (analytical pure), adopt molybdenum plate and vacuum muffle furnace, melt and dehydrate; 2) ball mill into powder after crushing, particle size is less than 0.3mm; 3) boric anhydride powder is placed in Store in a dry bottle.

[0072] 3. Loading: take 300g / part of boron anhydride, weigh 100g / part of magnesium shavings, put boron anhydride on the bottom layer in the molybdenum tray, then spread magnesium shavings, lay them layer by layer, and fill 80% full.

[0073] 4. Vacuum muffle furnace: Preheat to 800°C and stabilize for 30 minutes.

[0074] 5. Reaction: Place the molybdenum plate with the raw materials in the vacuum muffle furnace and vacuumize to 10 -5 Pa, start the thermal reduction reaction; when it i...

Embodiment 3

[0096] Preparation of amorphous boron powder:

[0097] 1. Preparation of magnesium shavings: take magnesium ingot (0#), and use planer to make shavings (0.1-0.5mm wide, 10-50mm long, 0.05-0.1mm thick)

[0098] 2. Preparation of boric anhydride powder: 1) take boric acid (analytical pure), adopt molybdenum disk and vacuum muffle furnace, melt and dehydrate; 2) ball mill into powder after crushing, particle size is less than 0.2mm; 3) boric anhydride powder is placed in Store in a dry bottle.

[0099] 3. Loading: take 300g / part of boron anhydride, weigh 100g / part of magnesium shavings, put boron anhydride on the bottom layer in the molybdenum tray, then spread magnesium shavings, lay them layer by layer, and fill 80% full.

[0100] 4. Vacuum muffle furnace: Preheat to 800°C and stabilize for 30 minutes.

[0101] 5. Reaction: Place the molybdenum plate with the raw materials in the vacuum muffle furnace and vacuumize to 10 -5 Pa, start the thermal reduction reaction; when it i...

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Abstract

The invention relates to a production technology of amorphous boron powder. The production technology comprises the following steps: stacking boron anhydrous and magnesium shavings with a mass ratio of 3:1 in layers, carrying out thermal reduction reactions at a temperature of 800 to 1100 DEG C to prepare amorphous boron, washing the amorphous boron, drying, and sieving so as to obtain the amorphous boron powder. The purity of the amorphous boron powder prepared by the provided technology is high, and can reach 97 to 98%. The boron particle is fine and uniform, the combustibility of the boron powder is good, and the amorphous boron powder can be applied to solid-fuel ramjet engine or used as a smoke-free clean propellant.

Description

technical field [0001] The invention relates to a production process of amorphous boron powder, belonging to the field of powder material preparation. Background technique [0002] Elemental boron has two structures: crystalline and amorphous. The element boron has a melting point of 2300°C and a density of 2.35g / cm3. It is a particularly hard and brittle solid whose hardness is second only to diamond. Crystalline boron is black-gray, sometimes black to silver-gray or bright red, with metallic luster, high electrical resistance, and conductivity increases with temperature. Amorphous boron is an odorless dark brown powder. It is stable in the air at room temperature. It can be oxidized when heated to 300°C and ignites when it reaches 700°C. The chemical properties of amorphous elemental boron are more active than crystalline elemental boron. Shaped boron powder also has the advantages of large specific surface area and high combustion calorific value, and has been valued in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/02
CPCC01B35/023
Inventor 刘守印汪劲松陈志良樊长雄
Owner 上海九鼎粉体材料有限公司