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Graphene toughened boron carbide ceramic material and preparation process thereof

A technology of boron carbide ceramics and preparation process, which is applied in the field of ion sintering materials, can solve the problems of boron carbide bullet-resistant ceramics that are difficult to apply in large quantities, low strength and toughness of boron carbide ceramics, and high pressureless sintering sintering temperature, etc., to achieve discharge plasma energy The utilization rate is environmentally friendly, the effect of high discharge plasma energy utilization rate, and high densification mechanical properties

Inactive Publication Date: 2018-09-11
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
Although the price of pressureless sintered boron carbide ceramics is lower than that of hot-pressed products, it is still expensive compared to other carbide structure ceramics

Method used

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  • Graphene toughened boron carbide ceramic material and preparation process thereof
  • Graphene toughened boron carbide ceramic material and preparation process thereof

Examples

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Effect test

Embodiment 1

[0026] A boron carbide ceramic material and its spark plasma sintering process, specifically: by mass percentage B 4 C81.5%, SiC15%, Al3%, and graphene 0.5% are used for batching, and the prepared mixed powder is used as the medium of absolute ethanol, and placed on an ultrasonic oscillator for 2 hours. After the ultrasonic oscillation is completed, it is dried and ground. Mesh sieve, stick the graphite paper coated with boron nitride lubricant to the inner wall of the graphite grinding tool, press the sieved powder into the graphite grinding tool, pre-press 10Mpa, hold the pressure for 5 minutes, put the powdered The outer layer of the graphite abrasive is wrapped with carbon felt, put it in the plasma sintering furnace, and evacuate the furnace cavity into a vacuum state. When the vacuum gauge shows that it is below 10Pa, then rush into the argon gas; set the uniaxial pressure to 30Mpa, and turn on the plasma power supply for heating , heat the sample up to 1850°C at a heati...

Embodiment 2

[0028] A boron carbide ceramic material and its spark plasma sintering process, specifically: by mass percentage B 4 C81%, SiC15%, Al3%, and graphene 1% are used for batching, and the prepared mixed powder is mixed with absolute ethanol as the medium, placed on an ultrasonic oscillator for 2 hours, dried and ground after the ultrasonic oscillation, and passed through a 100-mesh sieve , stick the graphite paper coated with boron nitride lubricant to the inner wall of the graphite grinding tool, press the sieved powder into the graphite grinding tool, pre-press 10Mpa, hold the pressure for 5 minutes, and put the graphite The outer layer of the tool is wrapped with carbon felt, placed in a plasma sintering furnace, and the furnace cavity is evacuated into a vacuum state. When the vacuum gauge shows that it is below 10Pa, then argon gas is injected; the uniaxial pressure is set to 30Mpa, and the plasma power is turned on for heating. Heat the sample up to 1825°C at a heating rate ...

Embodiment 3

[0030] A boron carbide ceramic material and its spark plasma sintering process, specifically: by mass percentage B 4 C80.5%, SiC15%, Al3%, and graphene 1.5% are used for batching, and the prepared mixed powder is used as the medium of absolute ethanol, and placed on an ultrasonic oscillator for 2 hours. After the ultrasonic oscillation is completed, it is dried and ground. Mesh sieve, stick the graphite paper coated with boron nitride lubricant to the inner wall of the graphite grinding tool, press the sieved powder into the graphite grinding tool, pre-press 10Mpa, hold the pressure for 5 minutes, put the powdered The outer layer of the graphite abrasive is wrapped with carbon felt, put it in the plasma sintering furnace, and evacuate the furnace cavity into a vacuum state. When the vacuum gauge shows that it is below 10Pa, then rush into the argon gas; set the uniaxial pressure to 30Mpa, and turn on the plasma power supply for heating , heat the sample up to 1825°C at a heati...

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Abstract

The invention discloses a graphene toughened boron carbide ceramic material and a preparation process thereof. The boron carbide ceramic material is prepared from the following ingredients in percentage by weight: 75 to 82 percent of B4C, 15 percent of SiC, 3 to 10 percent of Al and 0.5 to 3 percent of graphene. The boron carbide ceramic material is prepared by optimizing the process parameters such as ingredient proportion, sintering temperature and heat insulation time and using a discharging plasma technology at a fast temperature rise rate under the argon gas atmosphere protection. The prepared ceramic material has high compactness and also has high hardness and high toughness; the highest density of the comprehensive performance is 2.625g / cm<3>; the compactness reaches 100 percent; the hardness reaches 30.09+ / -0.39GPa; the fracture toughness property reaches 5.88+ / -0.49MPa.m<1 / 2>.

Description

technical field [0001] The invention belongs to the technical field of discharge plasma sintering materials, and relates to a boron carbide ceramic material and a preparation process thereof by discharge plasma sintering. 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 cov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622C04B35/64
CPCC04B35/563C04B35/622C04B35/64C04B2235/3826C04B2235/402C04B2235/425C04B2235/6562C04B2235/6567C04B2235/666C04B2235/77C04B2235/96
Inventor 殷增斌陈明丹徐伟伟袁军堂汪振华
Owner NANJING UNIV OF SCI & TECH