Zirconium diboride-based composite material toughened by colloid-dispersed chopped carbon fibers and preparation method thereof

A chopped carbon fiber and colloidal dispersion technology, applied in the field of ultra-high temperature ceramic matrix composite materials, can solve the toughening mechanism such as unfavorable fiber pullout, increase the reactivity of fiber and matrix, and limit the toughening effect of chopped carbon fiber. The effect of promoting the densification process, increasing the strength, and reducing the grain growth rate

Active Publication Date: 2016-08-31
DALIAN UNIV OF TECH
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Problems solved by technology

[0012] (3) During the ball milling process, the fiber and the matrix powder have to experience high-speed friction for a long time, which will increase the reactivity between the fiber and the matrix, making it easier for the fiber and the matrix to undergo chemical reactions during high-temperature sintering. This leads t

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  • Zirconium diboride-based composite material toughened by colloid-dispersed chopped carbon fibers and preparation method thereof
  • Zirconium diboride-based composite material toughened by colloid-dispersed chopped carbon fibers and preparation method thereof
  • Zirconium diboride-based composite material toughened by colloid-dispersed chopped carbon fibers and preparation method thereof

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[0033] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0034] A colloid-dispersed chopped carbon fiber toughened zirconium diboride-based composite material and a preparation method thereof, which are made of the following raw materials in parts by weight (g): chopped carbon fiber 2 (average length 2mm), nanometer zirconium diboride Powder 20, nano-silicon carbide powder 2, phenolic resin 3, polyethyleneimine 0.3, absolute ethanol 80.

[0035] The method for colloid dispersing chopped carbon fibers is as follows: dissolving phenolic resin with a mass fraction of 3 in absolute ethanol with a mass fraction of 80; adding chopped carbon fibers with a mass fraction of 2; and then adding mass fractions 2 nano-silicon carbide powder, and disperse by ultrasonic vibration for 2 hours; slowly add polyethyleneimine with a mass fraction of 0.3, and stir for 2 hours; vacuumize the p...

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Abstract

The invention discloses a zirconium diboride-based composite material toughened by colloid-dispersed chopped carbon fibers and a preparation method thereof and belongs to the technical field of ultrahigh-temperature ceramic-based composite materials. The zirconium diboride-based composite material is prepared from the raw materials including, by mass, 1-3 parts of the chopped carbon fibers, 15-25 parts of nano zirconium diboride powder, 1-3 parts of nano silicon carbide powder, 1-5 parts of phenolic resin, 0.1-0.5 parts of polyethyleneimine, and 60-100 parts of anhydrous ethanol. In the invention, the phenolic resin and the polyethyleneimine are subjected to a crosslinking reaction, wherein the short carbon fibers are uniformly dispersed in the colloid, thereby overcoming a problem of abrasion of the fibers during conventional ball-milling material blending. Through the colloid dispersion method, a high-temperature protective layer is formed on the surface of the carbon fibers, and further degradation rate during high-temperature sintering of the carbon fibers is reduced, interface bonding among fiber substrates is weakened, and debonding, bridge connection and pulling-out of the fibers are promoted. The zirconium diboride-based composite material has high compactness, high strength and high toughness.

Description

technical field [0001] The invention belongs to the technical field of ultra-high temperature ceramic-based composite materials, and relates to a ceramic-based composite material with chopped carbon fiber as a toughening phase and zirconium diboride as a matrix phase and a preparation method thereof, which overcomes the problems caused by traditional ball milling dispersion methods. fiber abrasion problem. Background technique [0002] Zirconium diboride (ZrB 2 ) has a high melting point (3200°C), high strength (500MPa), high hardness (23GPa), and excellent oxidation resistance and ablation resistance, making it one of the most promising ultra-high temperature structural materials. ZrB 2 It has broad application prospects in metallurgy, nuclear power generation, aerospace and other fields, and is expected to be used in key components of hypersonic aircraft thermal protection, such as: nose cone, wing leading edge, engine combustion chamber and nozzle. However, ZrB 2 The ...

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Application Information

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IPC IPC(8): C04B35/80C04B35/58C04B35/634
CPCC04B35/58078C04B35/63444C04B35/63476C04B35/806C04B2235/3826C04B2235/5248C04B2235/77C04B2235/785C04B2235/96
Inventor 沙建军李建张兆甫王首豪代吉祥祖宇飞
Owner DALIAN UNIV OF TECH
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