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Method for preparing boron carbide ceramic through low-temperature pulse pressurization

A boron carbide ceramic and pulse technology, which is applied in the field of boron carbide ceramic material processing and preparation, can solve the problems of destroying the lightness and poor performance of boron carbide ceramics, and achieve the effects of industrialized mass production, reduced sintering time and high efficiency

Inactive Publication Date: 2020-09-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the addition of sintering aids and the introduction of the second phase reduce the sintering temperature and increase the density to a certain extent, they also destroy the lightness of boron carbide ceramics, thereby affecting the performance of the prepared product. adversely affected

Method used

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  • Method for preparing boron carbide ceramic through low-temperature pulse pressurization
  • Method for preparing boron carbide ceramic through low-temperature pulse pressurization
  • Method for preparing boron carbide ceramic through low-temperature pulse pressurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First select B with a particle size of 25 μm 4 C powder is used as raw material powder. After vacuum drying, it is poured into a drum and placed on a planetary ball mill. After drying, the powder passes through sieves of 650, 800 and 900 mesh in sequence to obtain boron carbide powder after ball milling. The boron carbide powder that this implementation prepares is as figure 2 As shown, the particle size of boron carbide is about 2um.

[0026] Boron carbide powder is added in the mold of pressurization device, and boron carbide powder and mold are separated by graphite paper, then pressurization device is put into the pressure sintering furnace, under vacuum atmosphere (furnace vacuum control is 900Pa ), heating with a heating rate of 10°C / min, and pulse pressurization when the temperature rises to 100°C. Through the pressurization device, control the upper and lower indenters to apply 30MPa pulse pressure to the mold, and the pressure is controlled by the pressure s...

Embodiment 2

[0028] First select B with a particle size of 25 μm 4 C powder is used as raw material powder. After vacuum drying, it is poured into a drum and placed on a planetary ball mill. After drying, the powder passes through sieves of 650, 800 and 900 mesh in sequence to obtain boron carbide powder after ball milling.

[0029] Boron carbide powder is added in the mold of pressurization device, and boron carbide powder and mold are separated by graphite paper, then pressurization device is put into the pressure sintering furnace, under vacuum atmosphere (furnace vacuum control is 900Pa ), heating with a heating rate of 8°C / min, and pulse pressurization when the temperature rises to 100°C. Through the pressurization device, control the upper and lower pressure heads to apply 35MPa pulse pressure to the mold, and the pressure sensor at the bottom of the pressure head. The size is monitored in real time. The boost rate is 5MPa / min. After boosting to 35MPa, keep it for 8 minutes, and the...

Embodiment 3

[0031] First, select B with a particle size of 30 μm 4 C powder is used as raw material powder. After vacuum drying, it is poured into a drum and placed on a planetary ball mill. After drying, the powder passes through sieves of 650, 800 and 900 mesh in sequence to obtain boron carbide powder after ball milling.

[0032]Boron carbide powder is added in the mold of pressurization device, and boron carbide powder and mold are separated by graphite paper, then pressurization device is put into the pressure sintering furnace, under vacuum atmosphere (furnace vacuum control is 900Pa ), heating with a heating rate of 15°C / min, and pulse pressurization when the temperature rises to 100°C. Through the pressurization device, the upper and lower pressure heads are controlled to apply 40MPa pulse pressure to the mold, and the pressure is controlled by the pressure sensor at the bottom of the pressure head. The size is monitored in real time. The boost rate is 10MPa / min. After boosting t...

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Abstract

The invention discloses a method for preparing boron carbide ceramic through low-temperature pulse pressurization, which comprises the following steps: (1) drying raw material B4C powder, putting thepowder into a ball mill, carrying out ball milling, and drying and sieving after ball milling to obtain fine-grained B4C powder; and (2) putting the B4C powder in the step (1) into a mold of a pressurization device of a pressurization sintering furnace, vacuumizing or introducing inert gas, performing heating to raise the temperature to 100 DEG C, carrying out pulse pressurization until the temperature reaches 1300-1500 DEG C, stopping pulse pressurization, heating to a sintering temperature, sintering at a constant pressure, and cooling to obtain the fine-grained boron carbide ceramic material with high density. By adopting the pulse pressurization mode, the sintering time can be shortened under the condition that no auxiliary agent is added, the sintering temperature is reduced, the complete densification (the density reaches 98% or above) of the boron carbide powder is realized, and the characteristics of the fine-grained material is maintained.

Description

technical field [0001] The invention belongs to the technical field of processing and preparing boron carbide ceramic materials, and in particular relates to a method for preparing boron carbide ceramics by low-temperature pulse pressure. Background technique [0002] Boron carbide is composed of carbon and boron, and its stoichiometric formula is B 4 C, the unit cell has a hexagonal polyhedral structure, and boron carbide has many isomers, such as B with a rhombohedral structure 13 C 2 , B 12 C 3 and the closely related B 13 C 3 It is precisely because of the complex crystal structure and various isomers of boron carbide that boron carbide has excellent physical properties. As a stable material with high hardness, high melting point, good wear resistance and corrosion resistance, self-lubricating and self-polishing performance, boron carbide ceramics are widely used in industrial materials, aerospace and automotive and mechanical parts and other fields. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622C04B35/645
CPCC04B35/563C04B35/622C04B35/645C04B2235/5436C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/6581C04B2235/77C04B2235/782C04B2235/785C04B2235/96
Inventor 李瑞迪袁铁锤陈雨周志辉张梅
Owner CENT SOUTH UNIV
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