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Carbon fiber enhanced porous normal pressure sintering silicon carbide and preparation method thereof

A technology of atmospheric pressure sintering and carbon fiber, applied in the field of ceramic materials, can solve the problems of low strength of carbon graphite particles, reduced mechanical properties of materials, etc., to improve lubricating performance and ability to withstand dry friction, improve comprehensive performance, and overcome working conditions. the effect of dependence

Active Publication Date: 2010-05-26
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: 1. Although carbon graphite is a solid anti-friction material, when the fluid between the friction pairs is sufficient, the carbon graphite particles in the carbon-added atmospheric pressure sintered silicon carbide material basically do not work; 2. The strength of graphite particles itself is low, and after sintering of carbon-added atmospheric pressure sintered silicon carbide, a weak junction is easily formed between carbon graphite particles and silicon carbide matrix, which becomes the origin of defects, so the mechanical properties of the material are significantly reduced

Method used

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  • Carbon fiber enhanced porous normal pressure sintering silicon carbide and preparation method thereof
  • Carbon fiber enhanced porous normal pressure sintering silicon carbide and preparation method thereof
  • Carbon fiber enhanced porous normal pressure sintering silicon carbide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Prepared according to the following specific process steps:

[0045] 1) Mix SiC micropowder: boron powder: carbon black: phenolic resin: methanol in a mass ratio of 100:0.4:4.5:5.5:120 to form a slurry; use SiC micropowder with a diameter of 0.62 microns. A ball mill mixer is used for mixing, using SiC balls with a diameter of 5-15 mm, the rotating speed is 60 rpm, and the mixing time is 40 hours.

[0046] 2) Add carbon fiber with a volume content of 2% into the slurry and stir evenly. The aspect ratio of the carbon fiber is 25:1. Use an ultrasonic mixer with a rotation speed of 150 rpm and a stirring time of 3 hours.

[0047] 3) Stir the slurry in step 2) evenly with a volume content of 2% paraffin pore-forming agent (the range of paraffin particles is 5-50 microns) to obtain a mixed powder.

[0048] 4) Isostatic pressing under a pressure of 120 MPa (such as outer diameter × inner diameter × height of the finished product: 150 mm × 90 mm × 280 mm, the same as in the f...

Embodiment 2

[0051] Prepared according to the following specific process steps:

[0052] 1) Mix SiC micropowder: boron powder: carbon black: phenolic resin: methanol in a mass ratio of 100:2.9:1.5:10:120 to form a slurry; use SiC micropowder with a diameter of 0.52 microns. A ball mill mixer is used for mixing, using SiC balls with a diameter of 5-15 mm, the rotating speed is 60 rpm, and the mixing time is 40 hours.

[0053] 2) Add carbon fiber with a volume content of 25% into the slurry and stir evenly. The length-diameter ratio of the carbon fiber is 25:1. An ultrasonic mixer is used with a rotating speed of 300 rpm and the stirring time is 6 hours.

[0054] 3) Stir the slurry in step 2) evenly with a volume content of 20% paraffin pore-forming agent (paraffin particles range from 100 to 200 microns) to obtain a mixed powder.

[0055] 4) Isostatic pressing under a pressure of 160MPa, holding the pressure for 20 seconds.

[0056] 5) Sintering at 2080°C under normal pressure, the pressu...

Embodiment 3

[0058] Prepared according to the following specific process steps:

[0059] 1) Mix SiC micropowder: boron powder: carbon black: phenolic resin: methanol in a mass ratio of 100:1:3.5:6.5:120 to form a slurry; use SiC micropowder with a diameter of 0.62 microns. A ball mill mixer is used for mixing, using SiC balls with a diameter of 5-15 mm, the rotating speed is 60 rpm, and the mixing time is 40 hours.

[0060] 2) Add carbon fiber with a volume content of 6% into the slurry and stir evenly. The aspect ratio of the carbon fiber is 25:1. Use an ultrasonic mixer with a rotation speed of 150 rpm and a stirring time of 3 hours.

[0061] 3) Stir the slurry in step 2) evenly with a volume content of 6% paraffin pore-forming agent (paraffin particles range from 30 to 80 microns) to obtain a mixed powder.

[0062] 4) Isostatic pressing under a pressure of 120MPa, holding the pressure for 10 seconds.

[0063] 5) Sintering at 2030°C under normal pressure, the pressure in the furnace is...

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Abstract

The present invention discloses a carbon fibers reinforcing porous ambient-pressure sintering silicon carbide prepared from the following raw materials with certain mass ratio: SiC fine powder: boronpowder: carbon black: phenolic resin: methanol = 100: 0.3-3: 1-5: 5-10: 120, wherein 2-20 volume % micropores with size of 5-200 micron and 2-25 volume % carbon fibers are formed iside the finished products. The manufacturing method comprises the following steps: adopting silicon carbide fine powder as a base material, boron powder and carbon black as sintering agent, phenolic resin as adhesive, methanol as solvent, mixing them to plasm material, adding carbon fibers thereto and mixing them, mixing paraffin pore-forming agent therein uniformly after drying them, dry pressing or isostatic pressMmoulding, and then sintering them at ambient pressure to form the product. Said carbon fibers reinforcing porous ambient-pressure sintering silicon carbide can improve remarkablyb the lubrication performances and the dry friction enduring abilities of ambient-pressure sintering silicon carbide materials and enable the materaials to maintain very strong mechanical performances.

Description

technical field [0001] The invention relates to an engineering ceramic material and a preparation method thereof in the technical field of ceramic materials, in particular to a carbon fiber reinforced porous atmospheric pressure sintered silicon carbide and a preparation method thereof. Background technique [0002] Due to the outstanding properties of high strength, high hardness, high temperature resistance and resistance to almost all chemical media, the atmospheric pressure sintered silicon carbide material has been widely used in aerospace, nuclear power, petrochemical, automobile, shipbuilding, metallurgy and other fields. In order to further expand its application range in high-parameter, heavy-duty working conditions and various cutting-edge technology fields, various personalized and functional atmospheric pressure sintered silicon carbide new modified materials and composite materials have become popular in countries all over the world, especially developed countrie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/565
Inventor 邬国平
Owner NINGBO VULCAN TECH CO LTD