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A low-temperature high-strength toughness boron carbide material and its preparation method and application

A technology of high-strength toughness and boron carbide, which is applied in the field of ultra-fine-grain ultra-low temperature high-strength toughness boron carbide materials and its preparation, can solve the problems of not being able to resist high temperature and low temperature at the same time, insufficient toughness, and reduced mechanical properties, so as to solve the problem of high temperature and easy failure , excellent mechanical properties, and the effect of improving thermal stability

Active Publication Date: 2021-03-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boron carbide bearing material in the detector needs to be resistant to high temperature and low temperature. At present, the boron carbide bearings prepared in the industry cannot be resistant to high temperature and low temperature at the same time.
It shows obvious lack of toughness at low temperature and is easy to be brittle; while at high temperature, the grain is easy to grow and the mechanical properties are reduced.

Method used

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  • A low-temperature high-strength toughness boron carbide material and its preparation method and application
  • A low-temperature high-strength toughness boron carbide material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] First select a 30μm B 4 C powder and Sc 2 o 3 powder, the B 4 C powder and Sc 2 o 3 Powder according to Sc 2 o 3 Mix with a mass fraction of 0.5%, use rigid balls with a ball-to-material ratio of 10:1 (the size of the balls should be evenly distributed), and then ball mill at a ball milling speed of 200 rpm for 50 hours; the second step is the ball-milled B 4 C+Sc 2 o 3 The composite powder is placed in a container (the container contains 90% water), and after it is completely dispersed, take the suspension in the upper layer of the container, add acetic acid to make it precipitate, and dry it to obtain a B powder of about 1 μm. 4 C+Sc 2 o 3 Composite powder particles; the third step will B 4 C+Sc 2 o 3 Composite powder with mass fraction 0.5% Er 2 o 3 Add it to the same alcohol solution, and add 1% phosphoric acid solution activator, stir evenly and let it stand for 15 hours. After complete deposition, take out the alcohol, wash it, and dry it to obtain ...

Embodiment 2

[0049] First select the 28μm B 4 C powder and Sc 2 o 3 powder, the B 4 C powder and Sc 2 o 3 Powder according to Sc 2 o 3 Mix with a mass fraction of 0.8%, use rigid balls with a ball-to-material ratio of 10:1 (the balls are required to be evenly distributed in size), and then ball mill at a ball milling speed of 210 rpm for 50 hours; the second step is the ball-milled B 4 C+Sc 2 o 3 The composite powder is placed in a container (the container contains 90% water), and after it is completely dispersed, take the suspension in the upper layer of the container, add acetic acid to make it precipitate, and dry it to obtain a B powder of about 1 μm. 4 C+Sc 2 o 3 Composite powder particles; the third step will B 4 C+Sc 2 o 3 Composite powder with mass fraction 0.3% Er 2 o 3 Add it to the same alcohol solution, and add 1% phosphoric acid solution activator, stir evenly and let it stand for 15 hours. After complete deposition, take out the alcohol, wash it, and dry it to ...

Embodiment 3

[0051] First select a 30μm B 4 C powder and Sc 2 o 3 powder, the B 4 C powder and Sc 2 o 3 Powder according to Sc 2 o 3 The mass fraction is 1.9%, and the rigid balls with a ball-to-material ratio of 10:1 (the balls are required to be evenly distributed in size), and then ball milled at a ball milling speed of 200 rpm for 50 hours; the second step is the ball milled B 4 C+Sc 2 o 3 The composite powder is placed in a container (the container contains 90% water), and after it is completely dispersed, take the suspension in the upper layer of the container, add acetic acid to make it precipitate, and dry it to obtain a B powder of about 1 μm. 4 C+Sc 2 o 3 Composite powder particles; the third step will B 4 C+Sc 2 o 3 Composite powder with mass fraction 1.5% Er 2 o 3 Add it to the same alcohol solution, and add 1% phosphoric acid solution activator, stir evenly and let it stand for 15 hours. After complete deposition, take out the alcohol, wash it, and dry it to obt...

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Abstract

The invention relates to an ultra-fine grain ultralow-temperature high-strength high-toughness boron carbide material as well as a preparation method and an application thereof. The ultra-fine grain ultralow-temperature high-strength high-toughness boron carbide material designed by the invention is prepared from the following components: B4C<->(0.5 to 3 percent) FeMnCr<->(0.5 to 5 percent) CoCrNi<->(0.2 to 3 percent) Sc2O3<->(0.2 to 2 percent) Er2O3; the preparation method comprises the following steps: firstly, carrying out ball milling and sedimentation classification on B4C powder, scandium oxide and erbium oxide to obtain ultrafine B4C composite powder with the particle size of less than 1 mu m; then, using a coprecipitation method for preparing B4C and rare earth oxide Sc2O3 / Er2O3 uniformly dispersed composite powder; then, obtaining composite powder through a mechanical ball milling method; and finally, employing hot pressing / spark plasma sintering for preparation. The preparation method has the advantages that the prepared fine-grain boron carbide material can bear extremely high temperature and extremely low temperature, has high hardness, low friction coefficient, high wear resistance and high structure thermal stability in a space extremely-low-temperature environment and an extremely-low-temperature environment, and can be used as a lunar probe gyroscope bearing material.

Description

technical field [0001] The present invention relates to an ultra-fine-grain ultra-low temperature high-strength toughness boron carbide material and its preparation method and application, in particular to a boron carbide ceramic material containing a rare earth grain growth inhibitor and intermetallic aluminide toughened and its preparation method and application . Background technique [0002] Boron carbide (molecular formula is B 4 C, also known as tetraboron carbide, usually gray-black powder), has a melting point of 2350°C and has ultra-high hardness. It is the third hardest material known after diamond and cubic boron nitride. Its Mohs hardness is 9.3. Boron carbide is used as a bearing material for gyroscope dynamic pressure motors. The basic function of a gyroscope is a sensor for sensing angular displacement and angular velocity. Dense boron carbide is a hot-pressed ceramic material with good physical and chemical properties. Its hardness is second only to diamo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/02C22C1/05
CPCC22C1/051C22C29/005C22C29/02
Inventor 李瑞迪袁铁锤张梅周志辉
Owner CENT SOUTH UNIV