Preparation method of boron carbide ceramic composite material

A technology of boron carbide ceramics and composite materials, applied in the field of composite materials, can solve the problems of high sintering temperature and cost, poor mechanical properties, high equipment requirements, etc., to reduce residual tensile stress, improve mechanical properties, and low sintering temperature Effect

Active Publication Date: 2018-08-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hot-pressed sintered boron carbide ceramics have better performance, and the density can reach more than 95%. However, the sintering temperature and cost are relatively high. It is difficult to prepare large-sized and complex-shaped products
The temperature of pressureless sintering is as high as 2300°C, and it is difficult to realize the densification of ceramics, and the mechanical properties are poor, which cannot meet the actual needs of the industry.

Method used

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  • Preparation method of boron carbide ceramic composite material
  • Preparation method of boron carbide ceramic composite material
  • Preparation method of boron carbide ceramic composite material

Examples

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Effect test

Embodiment 1

[0027] This embodiment provides a method for preparing a boron carbide ceramic composite material, comprising the following steps:

[0028] S1, the boron carbide of 91g (B 4 C) The powder, the phenolic resin containing 9g of carbon elements and 100g of absolute ethanol are wet-mixed to form a mixed material. The mixed material was dried in a drying oven at a drying temperature of 50° C. and a drying time of 12 hours. Then grind the dried mixed material, pass through a 60-mesh sieve after grinding, and use the sieved mixed material as the material to be molded.

[0029] Among them, the selected B 4 The particle size of C powder is less than 3.5 μm. Since the performance of the final boron carbide ceramic composite material depends on the preparation process such as the component design, molding and sintering process of the selected raw materials, and B 4 The particle size of C powder plays a particularly important role in the product performance of boron carbide ceramic com...

Embodiment 2

[0077] This embodiment provides a method for preparing a boron carbide ceramic composite material, comprising the following steps:

[0078] S1. Add 91g of B 4 C powder, phenolic resin containing 9g of carbon elements and 100g of absolute ethanol were wet-mixed to form a mixed material. The mixed material was dried in a drying oven at a drying temperature of 80° C. and a drying time of 12 hours. Then grind the dried mixed material, pass through a 60-mesh sieve after grinding, and use the sieved mixed material as the material to be molded.

[0079] S2. Compress the material to be molded under a compression pressure of 220 MPa, and then place it in a drying oven for drying at a drying temperature of 80° C. and a drying time of 12 hours. After drying, a ceramic green body is obtained.

[0080] S3, placing the ceramic green body in a heating furnace, and then placing the silicon block on the ceramic green body to carry out vacuum infiltration reaction sintering. During the react...

Embodiment 3

[0083] This embodiment provides a method for preparing a boron carbide ceramic composite material, comprising the following steps:

[0084] S1, add 85g of B 4 C powder, phenolic resin containing 15g of carbon elements and 100g of absolute ethanol are wet-mixed to form a mixed material. The mixed material was dried in a drying oven at a drying temperature of 50° C. and a drying time of 12 hours. Then grind the dried mixed material, pass through a 60-mesh sieve after grinding, and use the sieved mixed material as the material to be molded.

[0085] S2. Compress the material to be molded under a compression pressure of 150 MPa, and then place it in a drying oven for drying at a drying temperature of 60° C. and a drying time of 12 hours. After drying, a ceramic green body is obtained.

[0086] S3, placing the ceramic green body in a heating furnace, and then placing the silicon block on the ceramic green body to carry out vacuum infiltration reaction sintering. During the react...

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Abstract

The invention relates to a preparation method of a boron carbide ceramic composite material. The method includes the steps of S1, performing wet mixing on boron carbide powder, a carbon source and a mixing medium to obtain a mixed material, drying, grinding, and sieving to obtain a material for mould pressing; S2, performing compression molding on the material for mould pressing, and drying to obtain a ceramic green body; S3, placing a silicon block on the ceramic green body to perform vacuum infiltration reaction sintering so as to obtain a boron carbide ceramic composite material precursor;S4, removing the residual silicon on the surface of the boron carbide ceramic composite material precursor, performing thermal treatment on the precursor in heating equipment, and cooling to room temperature to obtain the boron carbide ceramic composite material. The preparation method can lower sintering temperature, increase the compactness of the boron carbide ceramic composite material and increase the mechanical performance of the boron carbide ceramic composite material.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of boron carbide ceramic composite materials. Background technique [0002] Boron carbide (B 4 C) is an important structural ceramic, widely used in military, aerospace, chemical and nuclear industries due to its low density, ultra-high hardness, high temperature wear resistance, high melting point, chemical corrosion resistance and excellent neutron absorption performance . Compared with alumina and silicon carbide bulletproof materials, boron carbide ceramics are not only lower density, but also higher hardness. Therefore, the use of boron carbide as body armor and lightweight armor can reduce the weight of soldiers and improve the safety performance of equipment. At present, boron carbide ceramic seats have been widely used in the US military Apache armed helicopters. Boron carbide ceramic body armor is also equipped on a large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622C04B35/65
CPCC04B35/563C04B35/622C04B35/65C04B2235/3826C04B2235/428C04B2235/48C04B2235/5427C04B2235/5436C04B2235/602C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658C04B2235/6581
Inventor 张翠萍茹红强宗辉徐海彬夏乾秦肇伯尤田朱景辉
Owner NORTHEASTERN UNIV
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