Short fiber-silicon carbide nanofiber reinforced silicon carbide porous ceramic material and preparation method thereof

A technology of nanofibers and porous ceramics, which is applied in the field of short fiber-silicon carbide nanofiber reinforced silicon carbide porous ceramic materials and its preparation, which can solve the problems of high brittleness of porous ceramics, reduce corrosion damage, avoid delamination, and protect integrity sexual effect

Inactive Publication Date: 2018-09-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sound-absorbing panel developed by the Department of Chemical Engineering of Tsinghua University in Beijing can achieve an average attraction coefficient of 25%, but its bending strength is only 1.47MPa, which also makes the porous ceramic more brittle. Its mechanical properties are the key to the development of high-performance porous ceramics

Method used

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  • Short fiber-silicon carbide nanofiber reinforced silicon carbide porous ceramic material and preparation method thereof
  • Short fiber-silicon carbide nanofiber reinforced silicon carbide porous ceramic material and preparation method thereof
  • Short fiber-silicon carbide nanofiber reinforced silicon carbide porous ceramic material and preparation method thereof

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Experimental program
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Embodiment 1

[0032] Embodiment 1: the preparation method of short fiber-silicon carbide nanofiber reinforced silicon carbide porous ceramic material comprises the following steps:

[0033] (1) 7g of silicon powder and 2g of activated carbon powder (Aladdin's reagent) were mixed and ball milled. The ball milling parameter was 150r / min, and the ball milling time was 24 hours. (2) Weigh about 5g of phenolic resin, add about 6.25g of dehydrated alcohol to be configured into a solution, add 10ml of hydroxyethyl cellulose in the melt (the present invention does not limit the stirring speed and the stirring time of the dispersant ), adding 0.6 g of chopped carbon fibers, the length of which is about 1 mm. Afterwards, 2.5 g of the mixture obtained in step (1) was added to prepare a suspension, and the volume content of chopped carbon fibers in the suspension was 6%. The above-mentioned device was shaken and dispersed in ultrasonic waves, and then dried at room temperature for about 24 hours to pr...

Embodiment 2

[0037] In this embodiment, compared with Example 1, the addition of silicon powder, activated carbon powder, phenolic resin and dispersant is constant, and the only change is the addition of chopped carbon fiber. In this embodiment, the quality of chopped carbon fiber is 1.2g (The volume fraction in the suspension is 12%).

Embodiment 3

[0039] Compared with Example 1, the addition of silicon powder, activated carbon powder, phenolic resin and dispersant in this embodiment is constant, and the only change is the addition of chopped carbon fiber. In this embodiment, the quality of carbon fiber is 2g (in suspension The volume fraction in the turbid liquid is 18%).

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Abstract

The invention discloses a preparation method of a staple fiber-silicon carbide nanofiber reinforced silicon carbide porous ceramic material. Staple carbon fibers serve as a three-dimensional reinforcement skeleton, active carbon and phenolic resin serve as a carbon source, and the materials are heated in an argon atmosphere to a silicon melting point and then reacted with silicon powder. Carbon fibers and silicon carbide nanofibers are adopted for toughening and reinforcing porous silicon carbide ceramic, so that porous ceramic has high bending strength and also has certain fracture toughness.

Description

technical field [0001] The invention relates to the technical field of ceramic matrix composite materials, in particular to a short fiber-silicon carbide nanofiber reinforced silicon carbide porous ceramic material and a preparation method thereof. Background technique [0002] Porous ceramics are used as filters for molten metals due to their thermal shock stability, chemical stability, and resistance to metal scour. At the same time, because of its low pressure loss, heat resistance, thermal shock resistance and high oil fume collection efficiency, it has been widely used in diesel oil fume collection and filtration; in addition, because its surface is usually uneven, there are a lot of particles Pores, when used as a catalyst carrier, this special microstructure greatly increases the contact area of ​​the two phases, and the high thermal conductivity can greatly shorten the time for the catalyst to reach the activation temperature required for the reaction. Therefore, si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/80C04B35/565C04B35/622C04B35/65C04B35/634C04B35/632
CPCC04B35/573C04B35/622C04B35/632C04B35/63476C04B35/6365C04B35/65C04B35/806C04B38/0074C04B38/06C04B2235/428C04B2235/46C04B2235/5244C04B2235/5248C04B2235/96
Inventor 代吉祥沙建军吕钊钊邵俊琦张兆甫
Owner DALIAN UNIV OF TECH
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