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Method for fast preparing boron carbide ceramic powder

A boron carbide ceramic and powder technology, which is applied in the field of rapid preparation of boron carbide ceramic powder, can solve the problems of large particle size and long synthesis time, and achieve uniform and fine grains, shortened synthesis time and low free carbon content. Effect

Inactive Publication Date: 2012-10-17
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that if the traditional heat treatment method is adopted, the synthesis time is longer, and the particle size of the obtained product is relatively large, usually in the micron order, and the powder obtained after high temperature heat treatment contains a large amount of free carbon, and subsequent heat treatment is usually required to remove excess carbon.

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  • Method for fast preparing boron carbide ceramic powder
  • Method for fast preparing boron carbide ceramic powder
  • Method for fast preparing boron carbide ceramic powder

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Dissolve 7g of sucrose in 50mL of solvent acetic acid at a temperature of 75°C, and cool the resulting solution to room temperature to obtain a carbon source solution (used as a carbon source). After diluting 6mL of trimethyl borate solution with 10mL of methanol, place it in a constant temperature water bath at 20°C and stir for 10 minutes, add 1.5mL of chelating agent acetic acid to the mixture, and stir for 15 minutes to make it evenly mixed. A trimethyl borate mixed solution was obtained. The carbon source solution was measured according to the mass ratio of trimethyl borate and sucrose as 12:1, diluted with 30 mL of methanol, and added dropwise with 1 mL of water (HO 2 O) In the diluted carbon source, obtain a carbon source mixed solution; then add the carbon source mixed solution dropwise to the high-speed stirred trimethyl borate mixed solution, stir for 2 days at 20°C, mix well, and pass through 1 After aging for 1 day, a milky white gel was obtained, and t...

Embodiment 2

[0030] (1) Dissolve 7.5g of sucrose in 50mL of solvent acetic acid at a temperature of 80°C, and cool the resulting solution to room temperature to obtain a carbon source solution (used as a carbon source). After diluting 6mL of trimethyl borate solution with 20mL of methanol, place it in a constant temperature water bath at 25°C and stir for 10 minutes, add 2mL of chelating agent acetic acid to the mixture, and stir for 15 minutes to make it evenly mixed to obtain trimethyl borate mixture. Measure the carbon source solution according to the mass ratio of trimethyl borate and sucrose as 12:2 and dilute it with 20mL of methanol, add 2mL of H 2 O in the diluted carbon source to obtain a carbon source mixed solution; then add the carbon source mixed solution dropwise to the high-speed stirred trimethyl borate mixed solution, stir for 7 days at 25°C, and mix well, after 7 days After aging, a milky white gel was obtained, followed by drying in a drying oven at 80° C. for 24 hours,...

Embodiment 3

[0034] (1) Dissolve 8g of sucrose in 50mL of acetic acid solvent at a temperature of 85°C, and cool the resulting solution to room temperature to obtain a carbon source solution (used as a carbon source); dilute 6mL of trimethyl borate solution with 60mL of methanol, Place in a constant temperature water bath at 30°C and stir for 10 minutes, add 2mL of chelating agent acetic acid to the mixture, and stir for 15 minutes to make it evenly mixed to obtain a trimethyl borate mixture; The substance mass ratio is 12:2.5 Measure the carbon source solution, dilute it with 20mL of methanol, add 4mL of H 2 O in the diluted carbon source to obtain a carbon source mixed solution; then add the carbon source mixed solution dropwise to the high-speed stirred trimethyl borate mixed solution, stir for 3 days at 30°C, mix well, and after 1 day After aging, a milky white gel was obtained, and then dried in a drying oven at 110° C. for 48 hours, and ground for 1 hour to obtain xerogel powder.

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Abstract

The invention relates to a method for fast preparing boron carbide ceramic powder. The method for fast preparing the boron carbide ceramic powder comprises the following steps: 1) choosing raw materials: choosing trimethyl borate and sucrose according to the weight ratio of the trimethyl borate to the sucrose equal to (12:1)-(12:3); choosing methanol, chelating agent acetic acid and water according to the volume ratio of the trimethyl borate, the methanol, the chelating agent acetic acid to the water equal to (6:40:1:1)-(6:80:2:4); and choosing solvent acetic acid according to the ratio of the sucrose to the solvent acetic acid equal to (7-8)g:50ml; 2) preparing dry gel powder; 3) preparing precursor powder; and 4) thermally treating the precursor powder. Under the conditions of high heating speed and short heat preserving time, the carbon thermal reduction reaction is carried out so that the carbon thermal synthesis process of the boron carbide is shortened to dozens of minutes or even several minutes; and, high-purity fine carbon carbide ceramic powder with good sintering property can be obtained without the subsequent carbon removal processes. The carbon carbide ceramic powder is the single carbon carbide phase through X-ray diffraction analysis; the content of free carbon in the product is 1-3%; and, the grains are uniform and fine, and the average grain size is less than 500nm.

Description

technical field [0001] The invention relates to a method for quickly preparing boron carbide ceramic powder. Background technique [0002] Boron carbide is an important substance in carbide materials, and it is also a research hotspot in non-oxide ceramic materials in recent years. Boron carbide has a high ability to absorb thermal neutrons, and can be used as a control rod for nuclear reactors and as a shielding material for nuclear reactions; boron carbide ceramics are superhard materials with good chemical stability and good high temperature resistance, corrosion resistance, and oxidation resistance. It is a good high-temperature structural material, superhard tool material and surface protection material. At the same time, it also has excellent wear resistance, and has potential application value in cutting tool materials, abrasives, grinding parts, etc. [0003] In recent years, the extensive application of advanced technology in its conventional attack weapon system h...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/624C04B35/563
Inventor 张帆张金咏傅正义王为民王玉成王皓
Owner WUHAN UNIV OF TECH
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