Preparation method of high-density boron carbide ceramic

A boron carbide ceramics, density technology, applied in the field of ceramic materials, can solve the problems of boron carbide ceramics difficult to sinter and compact, low self-diffusion coefficient, etc., to achieve the effect of promoting sintering densification, improving dispersion, and eliminating air bubbles

Active Publication Date: 2022-05-27
NANTONG SANZER PRECISION CERAMICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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.

Method used

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  • Preparation method of high-density boron carbide ceramic
  • Preparation method of high-density boron carbide ceramic
  • Preparation method of high-density boron carbide ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Boron carbide primary paste:

[0052] S11, the polyethyleneimine aqueous solution that is 50% by mass percent concentration and the boron carbide micropowder are carried out a slurry (polyethyleneimine molecular weight is 70000, and the consumption of polyethyleneimine accounts for 1.2% of the total mass of boron carbide micropowder), and then Use 10mm boron carbide balls for ball milling, the mass ratio of boron carbide balls to boron carbide micropowder is 2:1, the speed of ball milling is 30rpm, and the ball milling time is 4h;

[0053] S12. Dry the ball-milled slurry at 50° C. for 48 hours, then crush it with a pulverizer, and pass it through a 40-mesh sieve to obtain a boron carbide modified powder;

[0054] Boron carbide secondary paste:

[0055] S21. The boron carbide modified powder and deionized water are mixed for the second time according to the solid content of 55%, and a dispersant accounting for 0.8% of the total mass of the boron carbide modified powder ...

Embodiment 2

[0062] Boron carbide primary paste:

[0063] S11, the polyethyleneimine aqueous solution that is 50% by mass percent concentration and the boron carbide micropowder are carried out a slurry (polyethyleneimine molecular weight is 80000, and the consumption of polyethyleneimine accounts for 0.5% of the total mass of boron carbide micropowder), and then Use 8mm finely ground boron carbide balls for ball milling, the mass ratio of boron carbide balls to boron carbide micropowder is 1:1, the speed of ball milling is 20rpm, and the ball milling time is 5h;

[0064] S12. Dry the ball-milled slurry at 45°C for 50 hours, then crush it with a pulverizer, and pass it through a 40-mesh sieve to obtain a boron carbide modified powder;

[0065] Boron carbide secondary paste:

[0066] S21. The boron carbide modified powder and deionized water are mixed according to the solid content of 50% for the second time, and a dispersant accounting for 1% of the total mass of the boron carbide modifie...

Embodiment 3

[0073] Boron carbide primary paste:

[0074] S11, the polyethyleneimine aqueous solution that is 50% by mass percent concentration and the boron carbide micropowder are carried out one time slurrying (polyethyleneimine molecular weight is 60000, and the consumption of polyethyleneimine accounts for 2% of the total mass of boron carbide micropowder), then Use 12mm finely ground boron carbide balls for ball milling, the mass ratio of boron carbide balls to boron carbide micropowder is 3:1, the speed of ball milling is 40rpm, and the ball milling time is 3h;

[0075] S12. Dry the ball-milled slurry at 55° C. for 45 hours, then crush it with a pulverizer, and pass it through a 40-mesh sieve to obtain a boron carbide modified powder;

[0076] Boron carbide secondary paste:

[0077] S21. The boron carbide modified powder and deionized water are mixed according to the solid content of 60% for the second time, and a dispersant accounting for 0.8% of the total mass of the boron carbid...

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Abstract

The invention belongs to the technical field of ceramic materials, and particularly relates to a preparation method of high-density boron carbide ceramic, which comprises the following steps: S11, carrying out primary slurry preparation on boron carbide, and carrying out ball milling; s12, drying, crushing and sieving the ball-milled powder to obtain boron carbide modified powder; s21, carrying out secondary slurry preparation on the boron carbide modified powder and deionized water, adding a dispersing agent, and carrying out ball milling; s22, adding a sintering aid, a binder and a release agent, and continuing ball milling to obtain slurry; performing spray granulation: sieving the slurry, and performing spray granulation to obtain granulation powder; aging the granulated powder: adding ethanol into the granulated powder, uniformly stirring, adding into a sealed bag, and aging; dry-pressing the granulated powder: uniformly mixing the coarse granulated powder and the fine granulated powder according to a certain proportion, and pressing the mixed powder by using a dry press to obtain a biscuit; and high-temperature sintering: carrying out one-time debonding and sintering on the biscuit to obtain the boron carbide ceramic.

Description

technical field [0001] The application belongs to the technical field of ceramic materials, and in particular relates to a preparation method of high-density boron carbide ceramics. 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, because boron carbide has good chemical stability and neutron absorption, 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. [0003] The pressureless sintering process can be made into complex shapes of green bodies, and the output of a single furnace is hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/626C04B35/622
CPCC04B35/563C04B35/62625C04B35/62695C04B35/622C04B2235/404C04B2235/3826C04B2235/3813C04B2235/6562C04B2235/6567C04B2235/77C04B2235/608Y02E30/30
Inventor 闫永杰唐倩
Owner NANTONG SANZER PRECISION CERAMICS CO LTD
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