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Boron carbide ceramic material and preparation method thereof

A technology of boron carbide ceramics and carbon paper, which is applied in the field of boron carbide ceramic materials and its preparation, can solve the problems of boron carbide anti-ballistic ceramics that are difficult to apply in large quantities, low strength and toughness, and consumption of boron carbide ceramics, and achieve discharge plasma energy Utilization rate Environmentally friendly, high utilization rate of discharge plasma energy, and less environmental pollution

Inactive Publication Date: 2019-07-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pressureless sintering has high production capacity and is suitable for mass production, but the pressureless sintering temperature is high, the holding time is long and compaction is difficult, so the overall cost is high
The high sintering temperature consumes a lot of electric energy when sintering boron carbide ceramics without pressure and hot pressing, the preparation cycle is long, and the production cost is high, which makes it difficult for boron carbide ballistic ceramics to be used in large quantities in weapons and equipment
In addition, when sintered at such a high temperature, the crystal grains will rapidly coarsen and grow, and the pores are difficult to discharge, resulting in a large number of pores remaining in the material. 3-5μm in diameter), the density is not high, which results in low strength and toughness of boron carbide ceramics
Therefore, it is difficult to achieve a balance between high mechanical properties and low production costs in the current preparation methods of boron carbide ceramics.

Method used

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  • Boron carbide ceramic material and preparation method thereof
  • Boron carbide ceramic material and preparation method thereof
  • Boron carbide ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A boron carbide ceramic material and its spark plasma sintering process, specifically: by mass percentage B 4 C85% and SiC15% are used for batching. The prepared mixed powder is placed on an ultrasonic oscillator for 2 hours with absolute ethanol as the medium. After the ultrasonic oscillation is completed, it is dried and ground, and passed through a 100-mesh sieve. The graphite paper of the agent is closely attached to the inner wall of the graphite mold, and the sieved powder is pressed into the graphite mold, pre-pressed at 10MPa, and the pressure is kept for 5 minutes. The outer layer of the graphite mold with the powder is wrapped with carbon felt, and placed in the plasma sintering In the furnace, evacuate the furnace cavity into a vacuum state. When the vacuum gauge shows below 10Pa, then pour in argon gas; set the uniaxial pressure to 30MPa, turn on the plasma power supply for heating, and heat the sample at a heating rate of 100°C / min To 1925 ℃, keep warm for ...

Embodiment 2

[0027] A boron carbide ceramic material and its spark plasma sintering process, specifically: by mass percentage B 4 C 85% and SiC 15% are used for batching, and the prepared mixed powder is placed on an ultrasonic oscillator for 2 hours with absolute ethanol as the medium. The graphite paper of the lubricant is closely attached to the inner wall of the graphite mold, and the sieved powder is pressed into the graphite mold, pre-pressed at 10MPa, and kept under pressure for 5 minutes, the outer layer of the graphite mold containing the powder is wrapped with carbon felt, and placed in the plasma In the sintering furnace, evacuate the furnace cavity into a vacuum state. When the vacuum gauge shows below 10Pa, then pour in argon gas; set the uniaxial pressure to 30MPa, turn on the plasma power supply for heating, and heat the sample at a heating rate of 100°C / min. Heat to 1950°C, keep it warm for 5 minutes, and then cool with the furnace. According to the test, the density of th...

Embodiment 3

[0029] A boron carbide ceramic material and its spark plasma sintering process, specifically: by mass percentage B 4 C82%, SiC15%, and Al3% are used for batching, and the prepared mixed powder is placed on an ultrasonic oscillator for 2 hours with absolute ethanol as the medium. After the ultrasonic oscillation is completed, it is dried and ground. The graphite paper of the boron lubricant lubricant is closely attached to the inner wall of the graphite mold, and the sieved powder is pressed into the graphite mold, pre-pressed at 10MPa, and kept under pressure for 5 minutes, and the outer layer of the graphite mold containing the powder is wrapped with carbon felt, and placed In the plasma sintering furnace, evacuate the furnace cavity into a vacuum state. When the vacuum gauge shows below 10Pa, then pour in argon gas; set the uniaxial pressure to 30MPa, turn on the plasma power supply for heating, and heat up at a rate of 100°C / min. The sample was heated to 1800°C, held for 5 ...

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Abstract

The invention belongs to the technical field of spark plasma sintering materials, and particularly relates to a boron carbide ceramic material and a preparation method thereof. The material comprisesthe following components in percentage by weight: 75%-82% of B4C, 15% of SiC and 3%-10% of Al. The method comprises the following steps: weighing B4C powder, SiC powder and Al powder in proportion; mixing the powder obtained in the step 1, and conducting vibrating on an ultrasonic vibrator for 2 hours by using absolute ethyl alcohol as a medium; drying the vibrated mixed powder, and then conducting grinding and sieving on the mixed powder; loading the mixed powder into a mold; conducting pre-pressing and forming; and in an argon atmosphere, adopting a spark plasma sintering process, and continuously conducting heating to 1625-1925 DEG C at a heating rate of 100 DEG C / min, carrying out heat preservation for 3-5 minutes, and then carrying out cooling along with a furnace to prepare the boroncarbide ceramic material. By adding the low-melting-point metal Al and utilizing the activation effect of the liquid metal Al at a high temperature, the volume diffusion rate of the grain boundary and crystal lattices of the boron carbide ceramic are improved, and the mechanical property of the boron carbide ceramic is improved; and the high-performance boron carbide ceramic is efficiently prepared by using discharge plasma sintering.

Description

technical field [0001] The invention belongs to the technical field of discharge plasma sintering materials, in particular to a boron carbide ceramic material and a preparation method thereof. Background technique [0002] Boron carbide is an important superhard material in nature. Its hardness is second only to diamond and cubic boron nitride. It also has low density, high elastic modulus, wear resistance, corrosion resistance, neutron absorption and high temperature semiconductor properties. It is a A new type of ceramic material with excellent comprehensive performance is used as sealing material, neutron absorbing material, bulletproof material, engine nozzle, polishing and fine abrasive of hard material, bulletproof armor material, nuclear radiation protection, etc., in nuclear energy, national defense and Widely used in machinery and other fields. [0003] The structure of boron carbide ceramics has extremely strong covalent bonds, the covalent bond fraction is above ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622
CPCC04B35/563C04B35/622C04B2235/3826C04B2235/402C04B2235/6562C04B2235/6567C04B2235/658C04B2235/666C04B2235/96
Inventor 司道行文梓达殷增斌蒋耀东徐春雨刘经纬
Owner NANJING UNIV OF SCI & TECH
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