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Carbon nano tube strengthening toughening silicon carbide ceramic and preparation method thereof

A carbon nanotube and toughening silicon carbide technology is applied in the fields of carbon nanotube reinforced and toughened silicon carbide ceramics and their preparation, high-performance engineering ceramic materials and their preparation fields, and achieves the effects of high reliability and high strength

Active Publication Date: 2012-07-11
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] But how to use the hot pressing or pressureless sintering process and the dispersion technology of carbon nanotubes to make the excellent mechanical properties of carbon nanotubes play a role in silicon carbide, and prepare a reinforced and toughened high-performance silicon carbide ceramics to meet extreme working conditions The demand for the following work, there is no relevant report yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Prepared according to the following specific process steps:

[0049] 1), according to silicon carbide fine powder: boron carbide fine powder: carbon powder: binder (PVA) is 100: 0.8: 3.5: 5 mass ratio mixing;

[0050] 2), adding 80% water by weight and 0.4% dispersant (tetramethylammonium hydroxide) to the mixed powder material and milling on a ball mill for 24 hours to form a mixed slurry;

[0051] 3), take the carbon nanotubes accounting for 1% of the weight of the silicon carbide powder, add ethanol 300 times the weight of the carbon nanotubes, and stir in an ultrasonic mixer for 2 hours to form a carbon nanotube ethanol suspension;

[0052] 4) Add the suspension in step 3) to the mixed slurry in step 2), and continue ball milling for 24 hours to form a slurry;

[0053] 5) After drying and pulverizing, sieve with an 80-mesh sieve to obtain mixed powder;

[0054] 6) Put the mixed powder in the hot pressing mold after compression molding;

[0055] 7) In an argon atm...

Embodiment 2

[0057] 1), according to silicon carbide fine powder: boron carbide fine powder: carbon powder: binder (glucose) is 100: 1.5: 4: 4 mass ratio mixes;

[0058] 2), adding 90% water by weight and 0.6% dispersant (sodium hexadecylsulfonate) to the mixed powder material and milling on a ball mill for 24 hours to form a mixed slurry;

[0059] 3), take carbon nanotubes accounting for 2% of the weight of silicon carbide powder, add ethanol with a weight ratio of 500 times, and stir in an ultrasonic mixer for 3 hours to form a carbon nanotube ethanol suspension;

[0060] 4) Add the suspension in step 3) to the mixed slurry in step 2), and continue ball milling for 24 hours to form a slurry;

[0061] 5) After drying and pulverizing, sieve with an 80-mesh sieve to obtain mixed powder;

[0062] 6) Put the powder directly into the hot pressing mold;

[0063] 7) In an argon atmosphere, heat up to 2000-2100° C. and pressurize to 30 MPa to complete hot-press sintering and obtain a carbon nan...

Embodiment 3

[0065] 1), according to silicon carbide micropowder: boron carbide micropowder: carbon powder: binder (methyl cellulose): aluminum oxide: yttrium oxide is 100: 0.8: 4: 6: 5: 4 mass ratio is mixed;

[0066] 2), adding 100% water and 0.3% dispersant (tetramethylammonium hydroxide) of the weight of silicon carbide micropowder to the mixed powder material, and ball milling on a ball mill for 23 hours to form a silicon carbide slurry;

[0067] 3), take carbon nanotubes with 1% weight of silicon carbide powder, add ethanol with a weight ratio of 400 times, and stir in an ultrasonic mixer for 3 hours to form a carbon nanotube ethanol suspension;

[0068] 4) Add the suspension in step 3) to the mixed slurry in step 2), and continue ball milling for 24 hours to form a slurry;

[0069] 5) After drying and pulverizing, sieve with an 80-mesh sieve to obtain mixed powder;

[0070] 6) Mixed powder compression molding (conventional technology in the industry) is placed in the sintering furn...

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Abstract

The invention discloses a carbon nano tube strengthening toughening silicon carbide ceramic. The ceramic is prepared from raw materials comprising silicon carbide powder, boron carbide micro powder, carbon dust, carbon nano tube, agglomerant and dispersing agent of which the weight ratio is 100:0.5-3:1.5-8:0.5-3:3-6:0.2-3.0. Hot pressed sintering or sintering-free process is adopted for preparation. A carbon nano tube strengthening hot pressed sintering silicon carbide material has the high flexural strength of 593MPa, weibull modulus achieves 14.7, reliability is substantially improved compared with general silicon carbide, excellent mechanical property of a carbon nano tube functions in the silicon carbide, and the prepared silicon carbide ceramic has excellent strengthening toughening performance.

Description

technical field [0001] The invention relates to a high-performance engineering ceramic material and a preparation method thereof in the technical field of ceramic materials, in particular to a carbon nanotube reinforced and toughened silicon carbide ceramic and a preparation method thereof. Background technique [0002] Silicon carbide ceramics have the characteristics of high strength, high hardness, wear resistance, heat resistance, and corrosion resistance to almost all chemicals. They also have excellent high-temperature mechanical and thermal properties, and have excellent radiation resistance and oxidation resistance. [0003] However, silicon carbide ceramics still have the disadvantages of brittleness and insufficient toughness, and after preparation, due to defects such as internal pores, low melting point impurities, and excessively long crystal lattices, the characteristics of silicon carbide ceramics often decrease. [0004] The randomness of inherent defects cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 邬国平
Owner NINGBO VULCAN TECH CO LTD
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