High-density boron carbide ceramic material and pressureless sintering preparation method thereof

A boron carbide ceramic and boron carbide technology are applied in the field of high-density boron carbide ceramic materials and the preparation of pressureless sintering, which can solve the problems of inability to bond boron carbide and the like.

Pending Publication Date: 2020-10-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-density boron carbide ceramic material and its preparation method for

Method used

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  • High-density boron carbide ceramic material and pressureless sintering preparation method thereof
  • High-density boron carbide ceramic material and pressureless sintering preparation method thereof
  • High-density boron carbide ceramic material and pressureless sintering preparation method thereof

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Embodiment 1

[0024] This embodiment provides a method for preparing high-density boron carbide ceramics by pressureless sintering. The raw materials are weighed according to the mass percentage of the following conditions: boron carbide 86%, chromium disilicide 3%, silicon carbide 3%, aluminum 1%, polyimide Amine 7%, carbon black 1%;

[0025] Mix the above-mentioned materials except polyimide and put them into a planetary ball mill for ball milling for 40 hours; the ratio of solid to liquid is 1:1, the ratio of ball to material is 6:1, and the speed of the ball mill is 600r / min. After ball milling, polyimide is added to the material, mixed evenly, dried, sieved through a 50-mesh sieve, and placed in a blower drying box for low-temperature drying to obtain a fine powder of the mixture.

[0026] After the mixture powder is pressed and molded under a molding pressure of 200MPa, the plain embryo is made, and then the plain embryo is subjected to pressureless vacuum sintering. During the sinter...

Embodiment 2

[0030] This embodiment provides a method for preparing high-density boron carbide ceramics by pressureless sintering. The raw materials are weighed according to the mass percentage of the following conditions: boron carbide 84%, chromium disilicide 4%, silicon carbide 6%, aluminum 1.5%, polyimide Amine 3%, carbon black 1.5%;

[0031] Mix the above-mentioned materials except polyimide and put them into a planetary ball mill for ball milling for 25 hours; the ratio of solid to liquid is 1:2, the ratio of ball to material is 6:1, and the speed of the ball mill is 500r / min. After ball milling, polyimide is added to the material, mixed evenly, dried, sieved through a 70-mesh sieve, and placed in a blower drying box for low-temperature drying to obtain a fine powder of the mixture.

[0032] After the mixture is pressed and molded at a molding pressure of 190MPa, the plain embryo is obtained, and the plain embryo is subjected to pressureless vacuum sintering. During the sintering pro...

Embodiment 3

[0036] This embodiment provides a method for preparing high-density boron carbide ceramics by pressureless sintering. The raw materials are weighed according to the mass percentage of the following conditions: boron carbide 82%, chromium disilicide 5%, silicon carbide 7%, aluminum 0.5%, polyimide Amine 5%, carbon black 0.5%;

[0037] Mix the above-mentioned materials except polyimide and put them into a planetary ball mill for ball milling for 30 hours; the ratio of solid to liquid is 1:1, the ratio of ball to material is 3:1, and the speed of the ball mill is 500r / min. After ball milling, polyimide is added to the material, mixed evenly, dried, sieved through a 70-mesh sieve, and placed in a blower drying box for low-temperature drying to obtain a fine powder of the mixture.

[0038] After the mixture powder is pressed and molded with a molding pressure of 220MPa, the plain embryo is obtained, and then the plain embryo is subjected to pressureless vacuum sintering. During the s...

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Abstract

The invention discloses a high-density boron carbide ceramic material and a pressureless sintering preparation method thereof. The high-density boron carbide ceramic material is prepared from, by mass, 2%-8% of chromium disilicide, 4%-10% of silicon carbide, 0-2% of aluminum, 3%-8% of polyimide powder, 0.5%-2.5% of carbon black and the balance boron carbide. In order to improve the density of theboron carbide ceramic, a metal simple substance with good wettability with boron carbide or a compound of the metal simple substance is often added. Chromium disilicide and silicon carbide are added as sintering aids to improve the mechanical properties. Chromium disilicide and boron carbide can form a eutectic liquid phase to realize liquid phase sintering, so that the density of boron carbide can be remarkably improved. The silicon carbide can also be pinned at a boron carbide grain boundary to hinder grain growth, and the mechanical property of the silicon carbide is improved. And the two sintering aids serving as second-phase particles are well mixed with the boron carbide matrix, so that the wettability is better, and the strength of the bonding surface of the ceramic material can beimproved.

Description

technical field [0001] The invention belongs to the technical field of boron carbide ceramic materials, and in particular relates to a high-density boron carbide ceramic material and a preparation method thereof without pressure sintering. Background technique [0002] Since its discovery as a by-product of metal boride research in the 19th century, boron carbide has become a research hotspot due to its high hardness, high melting point, high elastic modulus, and low density. At the same time, it has good chemical stability and neutron absorption, so boron carbide ceramics are widely used in wear-resistant materials, nuclear industry, bulletproof materials and other fields. Although boron carbide materials have many advantages, as a covalent bond ceramic, boron carbide has a very low self-diffusion coefficient, so boron carbide ceramics are extremely difficult to sinter and compact; at the same time, boron carbide is still a brittle material with low fracture toughness, whic...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622C04B35/65
CPCC04B35/563C04B35/622C04B35/65C04B2235/3826C04B2235/3891C04B2235/402C04B2235/424C04B2235/428
Inventor 李瑞迪袁铁锤邹亮周志辉张梅闫亚超
Owner CENT SOUTH UNIV
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