Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF12 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 pressureless sintering, to solve the problem that current sintering aids cannot effectively bond boron carbide in pressureless sintering

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Fracture toughnessaaaaaaaaaa
Bending strengthaaaaaaaaaa
Fracture toughnessaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com