A method of adding alumina powder to prepare boron carbide aluminum composite ceramic powder

A technology of composite ceramics and boron carbide aluminum, which is applied in the field of adding alumina powder to prepare boron carbide aluminum composite ceramic powder, which achieves the effects of high hardness, high raw material utilization rate, and reduced dust loss

Active Publication Date: 2021-11-05
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the shortcomings of traditional electric arc furnace smelting, and the advantages of composite ceramics and the excellent performance of Al-based additives, directly adding additives to raw materials has advantages over smelting products generated by in-situ reactions.

Method used

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  • A method of adding alumina powder to prepare boron carbide aluminum composite ceramic powder
  • A method of adding alumina powder to prepare boron carbide aluminum composite ceramic powder
  • A method of adding alumina powder to prepare boron carbide aluminum composite ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Grinding and screening the carbonaceous reducing agent;

[0033] 2. Boric acid powder, carbonaceous reducing agent powder, Al 2 o 3 The powder is compounded according to a certain weight ratio: 77% boric acid, 5% graphite, 5% petroleum coke, 3% charcoal, 5% activated carbon, and then add 5% Al to the prepared raw materials 2 o 3 .

[0034] 3. Press the mixed material into a 10mm thick mass on a high-pressure ball press;

[0035] 4. Dry the pressed lump wet material, the drying temperature is 60°C, and the drying time is 8 hours;

[0036] 5. Put the dried agglomerate into the induction furnace for high-temperature smelting, the smelting temperature is 1300°C, and the smelting time is 100min, and the boron carbide composite ceramic coarse powder is prepared;

[0037] 6. Crushing the boron carbide composite ceramic coarse powder, grading and removing impurities to obtain boron carbide composite ceramic fine powder;

[0038] 7. Recycle the slag powder for reuse.

Embodiment 2

[0040] 1. Grinding and screening the carbonaceous reducing agent;

[0041] 2. Boric acid powder, carbonaceous reducing agent powder, Al 2 o 3 The powder is compounded according to a certain weight ratio: 60% boric acid, 8% graphite, 8% petroleum coke, 5% charcoal, 9% activated carbon, and then add 10% Al to the prepared raw materials 2 o 3 .

[0042] 3. Press the mixed material into a 15mm thick mass on a high pressure ball pressing machine;

[0043] 4. Dry the pressed lump wet material, the drying temperature is 80°C, and the drying time is 11 hours;

[0044] 5. Put the dried agglomerate into the induction furnace for high-temperature smelting, the smelting temperature is 1600°C, and the smelting time is 80 minutes, and the boron carbide composite ceramic coarse powder is prepared;

[0045] 6. Crushing the boron carbide composite ceramic coarse powder, grading and removing impurities to obtain boron carbide composite ceramic fine powder;

[0046] 7. Recycle the slag pow...

Embodiment 3

[0048] 1. Grinding and screening the carbonaceous reducing agent;

[0049] 2. Boric acid powder, carbonaceous reducing agent powder, Al 2 o 3The powder is compounded according to a certain weight ratio: 45% boric acid, 5% graphite, 5% petroleum coke, 10% charcoal, 20% activated carbon, and then add 15% Al to the prepared raw materials 2 o 3 .

[0050] 3. Press the mixed material into a 25mm thick mass on a high-pressure ball press;

[0051] 4. Dry the pressed lump wet material, the drying temperature is 100°C, and the drying time is 6 hours;

[0052] 5. Put the dried agglomerate into the induction furnace for high-temperature smelting, the smelting temperature is 2300 ° C, and the smelting time is 30 minutes, and the boron carbide composite ceramic coarse powder is prepared;

[0053] 6. Crushing the boron carbide composite ceramic coarse powder, grading and removing impurities to obtain boron carbide composite ceramic fine powder;

[0054] 7. Recycle the slag powder for ...

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Abstract

The invention discloses a method for preparing boron carbide aluminum composite ceramic powder by adding alumina powder. The steps are as follows: (1) first crush the carbonaceous reducing agent into powder; (2) crush the carbonaceous reducing agent powder, boric acid powder and Al 2 o 3 The powder is batched, mixed, and pressed into pellets according to a certain proportion, and then the pellets are dried; (3) the pellets are put into a heating furnace for high-temperature smelting to prepare boron carbide composite ceramic coarse powder; (4 ) breaking the obtained coarse powder and classifying and removing impurities; (5) reclaiming and reusing the obtained slag powder, and using the boron carbide composite ceramic fine powder to make boron carbide composite ceramic sintering raw materials. Compared with traditional electric arc furnace smelting, the present invention improves the utilization rate of raw materials, significantly reduces production cost and energy consumption; directly adds Al to the configured raw materials 2 o 3 Compared to the in situ generation of Al in the reaction 2 o 3 There are obvious advantages; the fracture toughness of the boron carbide composite ceramics is obviously improved; the process can reduce environmental pollution and reduce high-temperature gas emissions.

Description

technical field [0001] The invention belongs to the field of preparation of boron carbide composite ceramics, and relates to a method for preparing boron carbide aluminum composite ceramic powder by adding alumina powder. Background technique [0002] Boron carbide, molecular formula B 4 C, gray-black powder, is one of the hardest artificial abrasives. Boron carbide has high hardness (Mohs hardness 9.36), good wear resistance and low density (2.52g / cm 3 ), high melting point (2450°C), low thermoelectric performance (room temperature 140s / m), strong acid and alkali resistance and strong neutron absorption capacity, etc., are widely used in mechanical grinding, refractory materials, engineering ceramics, nuclear industry and military and other fields. [0003] Composite materials usually have good comprehensive properties of different materials complementing each other. Composite materials have the characteristics of two or more materials, and can improve the performance o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B35/626
CPCC04B35/563C04B35/626C04B2235/3217
Inventor 邢鹏飞刘坤高帅波都兴红李欣孟凡兴
Owner NORTHEASTERN UNIV LIAONING
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