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Core-shell structure B4C-coated TiO2 composite powder and preparation method thereof

A composite powder, core-shell structure technology, applied in chemical instruments and methods, carbon compounds, titanium oxide/hydroxide, etc., can solve the problem of limited improvement in the sintering performance of C powder, difficult industrial application, and easy environmental pollution and other problems, to achieve the effect of controllable appearance, low cost, and no environmental pollution in output

Pending Publication Date: 2022-03-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO prepared by this method 2 Difficult to wrap in B 4 The surface of C forms a core-shell structure; and hydrofluoric acid is corrosive and easy to pollute the environment; the cost of experimental equipment is high, the output is low, and it is difficult for industrial application
[0006] Currently public B 4 C-TiO 2 TiO in the preparation technology of composite powder 2 , not only there are problems such as complex process, high cost and low yield, but the prepared B 4 C-TiO 2 Composite powder is difficult to disperse evenly in B 4 The surface of C forms a core-shell structure, and the surface of B 4 C powder sintering performance improvement is limited

Method used

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  • Core-shell structure B4C-coated TiO2 composite powder and preparation method thereof
  • Core-shell structure B4C-coated TiO2 composite powder and preparation method thereof
  • Core-shell structure B4C-coated TiO2 composite powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A core-shell structure B 4 C@TiO 2 Composite powder and its preparation method. The steps of the preparation method described in this example are:

[0037] Step 1. According to the volume ratio of boron carbide powder: alcohol solvent is 1: (80-100), add the boron carbide powder into the alcohol solvent and mix, ultrasonically disperse for 10-20min to obtain A solution .

[0038] Step 2. According to the boron carbide powder: titanate molar ratio of 1: (0.01-0.1), the titanate is added to the A solution and stirred for 1-2 hours to obtain a B solution.

[0039] Step 3. According to the volume ratio of deionized water: titanate (4-6): 1, the deionized water is added to the B solution at a constant speed, and the amount of the deionized water added per minute is the 0.1 to 0.2 times the volume of the B solution; then stirred in a water bath at 40 to 50°C for 1 to 2 hours to obtain a C solution.

[0040]Step 4. Suction filter the C solution to obtain a precipitate; wa...

Embodiment 2

[0045] A core-shell structure B 4 C@TiO 2 Composite powder and its preparation method. The steps of the preparation method described in this example are:

[0046] Step 1. According to the volume ratio of boron carbide powder: alcohol solvent is 1: (100-120), add the boron carbide powder into the alcohol solvent and mix, ultrasonically disperse for 10-20min to obtain A solution .

[0047] Step 2. According to the boron carbide powder: titanate molar ratio of 1: (0.1-0.5), the titanate is added to the A solution and stirred for 1-2 hours to obtain a B solution.

[0048] Step 3. According to the volume ratio of deionized water: titanate (6-8): 1, the deionized water is added to the B solution at a constant speed, and the amount of the deionized water added per minute is the 0.2 to 0.3 times the volume of the B solution; then stirred in a water bath at 40 to 50°C for 2 to 3 hours to obtain a C solution.

[0049] Step 4. Suction filter the C solution to obtain a precipitate; w...

Embodiment 3

[0054] A core-shell structure B 4 C@TiO 2 Composite powder and its preparation method. The steps of the preparation method described in this example are:

[0055] Step 1. According to the volume ratio of boron carbide powder: alcohol solvent is 1: (120-140), add the boron carbide powder into the alcohol solvent and mix, ultrasonically disperse for 20-30min to obtain A solution .

[0056] Step 2. According to the boron carbide powder: titanate molar ratio of 1: (0.5-0.7), the titanate is added to the A solution and stirred for 2-3 hours to obtain a B solution.

[0057] Step 3. According to the volume ratio of deionized water: titanate (8-9): 1, the deionized water is added to the B solution at a constant speed, and the amount of the deionized water added per minute is the 0.3-0.4 times the volume of the B solution; then stirred in a water bath at 50-60°C for 3-4 hours to obtain the C solution.

[0058] Step 4. Suction filter the C solution to obtain a precipitate; wash the...

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Abstract

The invention relates to B4C-coated TiO2 composite powder with a core-shell structure and a preparation method of the B4C-coated TiO2 composite powder. According to the technical scheme, the preparation method comprises the following steps: proportioning boron carbide powder and an alcohol solvent in a volume ratio of 1: (80-160), mixing, and ultrasonically dispersing to obtain a solution A; adding titanate into the solution A according to the molar ratio of boron carbide powder to titanate of 1: (0.01-1.0), and stirring to obtain a solution B; deionized water is added into the solution B at a constant speed according to the volume ratio of deionized water to titanate being (4-10): 1, stirring is conducted under the water bath condition of 40-60 DEG C, and a solution C is obtained; and carrying out suction filtration on the solution C to obtain a precipitate, washing the precipitate with deionized water and absolute ethyl alcohol respectively, drying at 80-100 DEG C for 10-24 hours, and carrying out heat preservation at 600-1000 DEG C in an argon atmosphere for 1-5 hours to prepare the core-shell structure B4C-coated TiO2 composite powder. The method has the characteristics of simple process, low cost, high yield and no environmental pollution, and the prepared product has good sintering performance.

Description

technical field [0001] The invention belongs to B 4 C@TiO 2 Composite powder technical field. Specifically related to a core-shell structure B 4 C@TiO 2 Composite powder and its preparation method. Background technique [0002] TiO 2 is a type in B 4 C is a commonly used sintering aid in the densification process of ceramics. During the sintering process, B 4 C will interact with TiO 2 A chemical reaction occurs, TiO 2 The Ti atom in replaces the B 4 The C atoms in C promote the material diffusion during sintering, thereby reducing the B 4 C The preparation temperature of the ceramic material increases the density. [0003] To make TiO 2 to B 4 C ceramics have a better sintering aid effect, requiring TiO 2 Powder particle size is small, and evenly dispersed in B 4 C powder. However, mechanical mixing is difficult to make TiO 2 and B 4 C powder is uniformly mixed, while B is prepared by chemical method 4 C-TiO 2 Composite powders are attracting the attent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053C01B32/991
CPCC01G23/053C01B32/991C01P2004/80C01P2004/61C01P2004/03C01P2002/72
Inventor 陈平安邹鑫李享成朱颖丽朱伯铨
Owner WUHAN UNIV OF SCI & TECH