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High-performance boron carbide ceramic composite material and preparation method

A technology of boron carbide ceramics and composite materials, applied in the field of composite materials, can solve problems such as difficulty in sintering and densification, low strength and toughness of ceramics, difficulty in meeting requirements, etc., to improve mechanical properties, density, and flexural strength The effect of crack toughness

Inactive Publication Date: 2019-05-14
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high covalent bond content of boron carbide, it is very difficult to sinter and densify, and the strength and toughness of the obtained ceramics are low, which is difficult to meet the requirements of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix 40g of boron carbide powder with an average particle size of 0.8μm, 9.5g of titanium disilicide powder with an average particle size of 1.5μm, 245g of balls and 35g of absolute ethanol for 7 hours, and put the mixed powder at 100°C Dry in an oven for 5 hours, and then pass the powder through a 60-mesh sieve. Put the sieved material into the high-strength, high-density graphite mold cavity, the cavity is a cuboid, and a layer of flexible graphite is pasted around the cavity. Under the vacuum condition of 10Pa, it is raised from room temperature to 1800°C at 30°C / min, and then from 1800°C to 2050°C at 25°C / min. Then apply a pressure of 20MPa to the material, keep warm and keep the pressure for 1h. After that, all the pressure is released within 1 minute, and the furnace body is air-cooled to room temperature. The density of the obtained boron carbide ceramics is 99.96%, which is almost fully dense. Fracture toughness is 5.5MPa m 1 / 2 , The flexural strength is 520M...

Embodiment 2

[0025] Mix 35g of boron carbide powder with an average particle size of 0.6μm, 9g of titanium disilicide powder with an average particle size of 1μm, 200g of balls and 40g of absolute ethanol ball mill for 6 hours, and put the mixed powder into an oven at 120°C Dry within 4 hours, and then pass the powder through a 40-mesh sieve. Put the sieved material into a high-strength, high-density graphite mold cavity, the cavity is a cylinder, and a layer of flexible graphite is pasted around the cavity. Under the vacuum condition of 0.1Pa, it is raised from room temperature to 1800°C at 35°C / min, and then from 1800°C to 2100°C at 30°C / min. Then apply a pressure of 40MPa to the material and keep it warm for 1h. Afterwards, the furnace body was air-cooled to room temperature, and the pressure remained constant at 40 MPa. The density of the obtained boron carbide ceramics is 99.99%, which is almost fully dense. Fracture toughness is 6.1MPa m 1 / 2 , The flexural strength is 550MPa, whi...

Embodiment 3

[0027] Mix 35g of boron carbide powder with an average particle size of 4μm, 10g of titanium disilicide powder with an average particle size of 3μm, 280g of balls and 45g of absolute ethanol for 5 hours, and put the mixed powder into an oven at 80°C Dry for 10 hours, then pass the powder through a 30-mesh sieve. Put the sieved material into a high-strength, high-density graphite mold cavity, the cavity is a cylinder, and a layer of flexible boron nitride is pasted around the cavity. Under the vacuum condition of 70Pa, it was raised from room temperature to 1800°C at 25°C / min, and then from 1800°C to 1900°C at 20°C / min. Then apply a pressure of 60 MPa to the material and keep it warm for 3 hours. Afterwards, the furnace body is air-cooled to room temperature, and the pressure is released to 40MPa within 1min, and the pressure remains unchanged at 40MPa. The density of the obtained boron carbide ceramics is 99.92%, which is almost fully dense. Fracture toughness is 5.2MPa m ...

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Abstract

The invention discloses a high-performance boron carbide ceramic composite material and a preparation method, and belongs to the technical field of material synthesis. The material comprises the following components in percent by mass: 60 to 95 wt% of boron carbide, and 5 to 40 wt% of titanium disilicide. The method comprises the following steps: performing ball milling mixing on boron carbide powder and titanium disilicide by taking anhydrous alcohol as a medium, sieving, and drying in a vacuum condition; loading powder into a high-strength and high-density graphite die, and performing hot pressing sintering in a vacuum condition, so as to obtain the boron carbide ceramic composite material. The boron carbide ceramic composite material has the characteristics of full density and high performance. In addition, the material is simple in equipment, convenient to operate, maintain to maintain and overhaul, and applicable to industrial production.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of high-performance boron carbide ceramic composite materials. Background technique [0002] Boron carbide ceramics have a series of excellent properties such as low density, high hardness, high melting point and large neutron absorption cross-sectional area, so they can be applied in the fields of bulletproof armor and nuclear shielding materials. Applications in fields such as bulletproof armor and nuclear shielding materials require boron carbide to have high density and mechanical properties. However, due to the high covalent bond content of boron carbide, it is very difficult to sinter and densify, and the strength and toughness of the obtained ceramics are low, which is difficult to meet the requirements of practical applications. Therefore, how to obtain boron carbide ceramics with high density and high mechanical properties is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/64
Inventor 邢鹏飞王帅庄艳歆闫姝聂丹高波尹华意
Owner NORTHEASTERN UNIV