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Boron carbide-titanium boride multiphase ceramic material and pressureless sintering preparation method thereof

A technology of composite ceramics and titanium boride, applied in the field of structural ceramics, can solve the problems that restrict the popularization and application of boron carbide ceramic materials, complex production equipment, and little improvement in toughness, so as to improve the degree of densification, reduce the cost of raw materials, and promote The effect of the sintering process

Active Publication Date: 2018-09-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although a lot of research has been done on the preparation technology of boron carbide composite materials at home and abroad, the toughness of the prepared boron carbide ceramic materials is not much improved, the production equipment is complicated and the cost is expensive, which seriously restricts the popularization and application of boron carbide ceramic materials.

Method used

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  • Boron carbide-titanium boride multiphase ceramic material and pressureless sintering preparation method thereof
  • Boron carbide-titanium boride multiphase ceramic material and pressureless sintering preparation method thereof
  • Boron carbide-titanium boride multiphase ceramic material and pressureless sintering preparation method thereof

Examples

Experimental program
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Embodiment 1

[0038] a B 4 C-TiB 2 A pressureless sintering preparation method of a multiphase ceramic material, the method steps are as follows:

[0039] (1) 50g of boron carbide powder (purity ≥ 90%, D 50 10μm), titanium boride powder 10g (purity ≥ 99%, D 50 10μm), amorphous carbon powder 10g (purity ≥ 99%, D 50 500nm), silicon powder 30g (purity ≥ 96%, D 50 1 μm), 200ml of dehydrated ethanol; put it into a nylon tank, ball mill on a planetary ball mill (ball-to-material ratio 1:1), ball mill speed 450r / min, ball milling time 48h; get mixed slurry;

[0040] (2) Dry the mixed slurry on a rotary evaporator, then dry in an oven for 12 hours; grind in a mortar, pass through a 100-mesh sieve to obtain a powder;

[0041] (3) The powder is dry-pressed into a graphite mold, and subjected to cold isostatic pressing, with a pressure of 500 MPa and a holding time of 5 minutes to obtain a green body;

[0042] (4) Put the green body into a graphite vacuum sintering furnace for sintering at a sin...

Embodiment 2

[0047] a B 4 C-TiB 2 A pressureless sintering preparation method of a multiphase ceramic material, the method steps are as follows:

[0048] (1) 80g of boron carbide powder (purity ≥ 99%, D 50 3μm), titanium boride powder 10g (purity ≥ 95%, D 50 10μm), amorphous carbon powder 5g (purity ≥ 96%, D 50 3μm), silicon powder 5g (purity ≥ 96%, D 50 3 μm), 30 ml of absolute ethanol; put it into a nylon tank, and ball mill on a planetary ball mill (ball-to-material ratio 10:1), ball mill speed 80r / min, ball milling time is 12h; obtain mixed slurry;

[0049] (2) Dry the mixed slurry on a rotary evaporator, then dry in an oven for 36 hours; grind in a mortar, pass through a 60-mesh sieve to obtain a powder;

[0050] (3) The powder is dry-pressed into a graphite mold, and subjected to cold isostatic pressing, with a pressure of 100 MPa and a holding time of 30 minutes to obtain a green body;

[0051] (4) Put the green body into a graphite vacuum sintering furnace for sintering at a ...

Embodiment 3

[0056] a B 4 C-TiB 2 A pressureless sintering preparation method of a multiphase ceramic material, the method steps are as follows:

[0057] (1) 60g of boron carbide powder (purity ≥ 96%, D 50 5μm), titanium boride powder 30g (purity ≥ 95%, D 50 3μm), amorphous carbon powder 3g (purity ≥ 99%, D 50 300nm), silicon powder 7g (purity ≥ 99%, D 50 500nm), dehydrated ethanol 200ml; put it into a nylon tank, ball mill on a planetary ball mill (ball-to-material ratio 1:1), ball mill speed 300r / min, ball milling time 8h; obtain mixed slurry;

[0058] (2) Dry the mixed slurry on a rotary evaporator, and then dry it in an oven for 24 hours; grind it in a mortar, and pass through an 80-mesh sieve to obtain a powder;

[0059] (3) The powder is dry-pressed into a graphite mold, and subjected to cold isostatic pressing, with a pressure of 300 MPa and a holding time of 20 minutes to obtain a green body;

[0060] (4) Put the green body into a graphite vacuum sintering furnace for sinteri...

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Abstract

The invention relates to a boron carbide-titanium boride multiphase ceramic material and a pressureless sintering preparation method thereof, and belongs to the technical field of structural ceramics.Calculated by using total mass of a multiphase ceramic raw material as 100%, the boron carbide-titanium boride multiphase ceramic material is prepared from the following components according to a mass percent: 50%-80% of boron carbide powder, 10%-30% of titanium boride powder, 3%-20% of amorphous carbon powder, and 5%-30% of silicon powder. The method comprises the following steps: mixing raw materials and adding to medium solution, ball-milling and mixing to obtain mixed slurry; after drying the mixed slurry, grinding, sieving to obtain powder; performing compression mould forming on the powder, and performing isostatic cool pressing to obtain a green body; and performing high-temperature pressureless sintering on the green body in vacuum or a protecting gas to obtain the boron carbide-titanium boride multiphase ceramic material. The toughness of the material is apparently improved, the production cost is greatly reduced, and the material can be extensively suitable for the fields ofnuclear power, light armored protection and the like.

Description

technical field [0001] The invention relates to a boron carbide-titanium boride composite ceramic material and a pressureless sintering preparation method thereof, belonging to the technical field of structural ceramics. Background technique [0002] Boron carbide (B 4 C) Ceramics have low density, high hardness (second only to cubic boron nitride and diamond), wear resistance and good neutron absorption cross-section characteristics, and are widely used in lightweight armor protection, nuclear energy and wear resistance Damaged parts and other fields. [0003] Boron carbide is a ceramic material with strong covalent bonds, accounting for 93.94% of covalent bonds, and its low self-diffusion coefficient makes it difficult to sinter and densify pure boron carbide. The most important prerequisites for the preparation of pure boron carbide by pressureless sintering are the use of ultrafine powder with a particle size of less than 3 μm, a protective atmosphere and high temperat...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/64
CPCC04B35/563C04B35/64C04B2235/3813C04B2235/422C04B2235/428C04B2235/668C04B2235/96
Inventor 程焕武朱宇王扬卫安瑞邹金娉韩宝锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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