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A method for synthesizing nano boron carbide powder by sol-gel method

A sol-gel method, nano-boron carbide technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that solid-state mixing is difficult to achieve sufficient uniformity, and achieve small grain size, Improve the effect of grain refinement and uniform size

Active Publication Date: 2016-09-07
内蒙古元瓷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this patent is that the required raw materials must be close to the nanometer level and mixed uniformly, and solid state mixing is difficult to achieve sufficient uniformity

Method used

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  • A method for synthesizing nano boron carbide powder by sol-gel method
  • A method for synthesizing nano boron carbide powder by sol-gel method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for synthesizing nano boron carbide powder by sol-gel method, the steps are as follows:

[0031] (1) Weigh 100 g of boric acid and 200 g of citric acid monohydrate, respectively, dissolve them in deionized water and mix them evenly, and place them on a magnetic stirrer for heating and stirring;

[0032] (2) Adjust the pH to 2 with AR grade ammonia water. When the water evaporates and the temperature of the solution reaches 102℃, put the solution in a microwave oven and heat it on medium heat (500W) for 30 minutes. After the excess water has evaporated, a golden yellow gel is formed first , Continue to heat, and finally get a golden bread-like product;

[0033] (3) The product obtained in step (2) is crushed through a 200-mesh sieve, placed in a graphite crucible, placed in a vacuum environment, heated to 700°C at a temperature increase rate of 10°C per minute, and kept for 4 hours to obtain a black precursor.

[0034] (4) The precursor obtained in step (3) is crushed t...

Embodiment 2

[0037] A method for synthesizing nano boron carbide powder by sol-gel method, the steps are as follows:

[0038] (1) Weigh 100 g of boric acid and 200 g of citric acid monohydrate, respectively, dissolve them in deionized water and mix them evenly, and place them on a magnetic stirrer for heating and stirring;

[0039] (2) Adjust the pH to 2.5 with AR grade ammonia water. When the water evaporates and the temperature of the solution reaches 106°C, put the solution in a microwave oven and heat it on a medium heat (500W) for 30 minutes. The excess water evaporates and a golden gel is formed first , Continue to heat, and finally get a golden bread-like product;

[0040] (3) The product obtained in step (2) is crushed through a 200-mesh sieve, placed in a graphite crucible, placed in a vacuum environment, heated to 650°C at a temperature increase rate of 8°C per minute, and kept for 4 hours to obtain a black precursor.

[0041] (4) The precursor obtained in step (3) is crushed through a 2...

Embodiment 3

[0043] A method for synthesizing nano boron carbide powder by sol-gel method, the steps are as follows:

[0044] (1) Weigh 100 g of boric acid and 200 g of citric acid monohydrate, respectively, dissolve them in deionized water and mix them evenly, and place them on a magnetic stirrer for heating and stirring;

[0045] (2) Adjust the pH to 3 with AR grade ammonia water. When the water evaporates and the temperature of the solution reaches 110°C, put the solution in a microwave oven and heat it on a medium-high fire (700W) for 20 minutes. The excess water will evaporate and form a golden gel first. , Continue to heat, and finally get a golden bread-like product;

[0046] (3) The product obtained in step (2) is crushed and passed through a 200-mesh sieve, put into a graphite crucible, placed in a vacuum environment, heated to 700° C. at a temperature rise rate of 5° C. per minute, and kept for 4 hours to obtain a black precursor.

[0047] (4) The precursor obtained in step (3) is crushe...

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Abstract

The invention relates to a method for preparing nano-boron carbide powder by sol-gel. Boric acid is used as boron source and citric acid is used as carbon source. Sol-gel is used to achieve uniform mixing of raw materials on a molecular scale. Microwave ovens are used to heat the gel to generate foam. After being pulverized, it is calcined at 650°C-700°C in a vacuum environment, and the boron carbide nano-powder is prepared by a high temperature treatment at 1400°C-1700°C in a vacuum environment by the carbothermal reduction method. The method of the invention has simple process, low production cost, can realize powder preparation at relatively low temperature, can realize batch production, and the prepared product has uniform grain size and good dispersion effect.

Description

Technical field [0001] The invention relates to a preparation method of boron carbide nano powder, in particular to a method for synthesizing nano boron carbide powder by a sol-gel method, and belongs to the field of inorganic non-metallic nano materials. Background technique [0002] Boron carbide (B 4 C) It has the characteristics of high hardness, high modulus, high melting point, low density, good wear resistance, strong acid and alkali resistance, and has high neutron absorption capacity, which has been widely used in many fields. The preparation of nano boron carbide powder can effectively promote the sintering performance of boron carbide ceramics by using surface effects such as small size effect, quantum effect, unsaturated valence effect and electron tunneling effect of nano particles. [0003] There have been many reports on the synthesis of boron carbide powder. Yanshan University Zhou Zhongmin et al. (New Chemical Materials, 2005, 33(8):1-4) used boron tribromide (BBr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/36B82Y30/00
Inventor 张玉军赵佳星龚红宇艾树鹤
Owner 内蒙古元瓷新材料科技有限公司