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Preparation method of magnetic silicon carbide ceramic nano particles

A technology of silicon carbide ceramics and nanoparticles, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as easy agglomeration, reduced product stability, and non-uniform dispersion of nano-iron powder. To achieve the effect of enhancing the dielectric properties

Active Publication Date: 2015-04-22
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It adopts a method of physical doping. Although this method is simple in process and convenient in operation, the nano-iron powder cannot be uniformly dispersed and easily agglomerated, which reduces the stability of the product.

Method used

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  • Preparation method of magnetic silicon carbide ceramic nano particles
  • Preparation method of magnetic silicon carbide ceramic nano particles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, a kind of preparation method of magnetic silicon carbide ceramic nanoparticles, carries out following steps successively:

[0030] 1) Preparation of iron sol: check figure 1 (exist figure 1 Among them, each mark is: 1. reactant; 2. dropping funnel; 3. gas; 4. serpentine condenser; 5. thermocouple; 6. argon; 7. magnetic stirrer) Vacuumize, fill with high-purity argon, and repeat the operation three times. Under the protection of high-purity argon, inject iron acetylacetonate, polycarbosilane and xylene (mass ratio is 3:1:10) into the reaction system, and the high-purity argon After purging for 30 minutes, heat to 120° C., keep the temperature constant for 48 hours, and cool to room temperature to obtain a black iron sol solution.

[0031] 2) Mixing of iron sol and asphalt: dissolve petroleum asphalt in an appropriate amount of xylene, then add iron sol under mechanical stirring (the mass ratio of asphalt to iron sol is 9:1), and increase the temperature a...

Embodiment 2

[0035] Embodiment 2, a kind of preparation method of magnetic silicon carbide ceramic nanoparticles, carries out following steps successively:

[0036] 1) Preparation of cobalt sol: check figure 1 The airtightness of the medium device is evacuated, filled with high-purity argon, and the operation is repeated 3 times. Under the protection of high-purity argon, (cyclopentadiene) cobalt, polycarbosilane and petroleum ether (mass ratio is 2: 1:40) into the reaction system, purged with high-purity argon for 30 minutes, heated to 90°C, kept at a constant temperature for 48 hours, and cooled to room temperature to obtain a black iron sol solution.

[0037]2) Mix cobalt sol with asphalt: dissolve petroleum asphalt in an appropriate amount of petroleum ether, then add iron sol (the mass ratio of asphalt to cobalt sol is 5:1) under mechanical stirring, and increase the temperature at the programmed temperature at 5°C / min Stir for 10 minutes after reaching the boiling point of petroleum...

Embodiment 3

[0041] Embodiment 3, a kind of preparation method of magnetic silicon carbide ceramic nanoparticles, carries out following steps successively:

[0042] 1) Preparation of nickel sol: check figure 1 The airtightness of the medium device is vacuumized, filled with high-purity argon, and the operation is repeated three times. Under the protection of high-purity argon, nickel acetylacetonate, polycarbosilane and N, N dimethylformamide (mass ratio of 5 : 2: 100) into the reaction system, purged with high-purity argon for 30 minutes, heated to 170 ° C, kept at a constant temperature for 10 hours, and cooled to room temperature to obtain a black nickel sol solution.

[0043] 2) Mixing of nickel sol and asphalt: dissolve petroleum asphalt in an appropriate amount of N, N dimethylformamide, then add nickel sol under mechanical stirring (the mass ratio of asphalt to iron sol is 7:1), at the programmed temperature Raise to the boiling point of N,N dimethylformamide at 5°C / min, stir for 1...

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Abstract

The invention provides a preparation method of magnetic silicon carbide ceramic nano particles, and relates to silicon carbides. The method comprises the steps that 1, magnetic metallo-organic compounds and polycarbosilane react in a solution, magnetic metal sol is obtained; 2, the magnetic metal sol obtained from the step 1 and pitch are mixed and react, then solvents are eliminated, and a mixture with the evenly distributed magnetic metal polycarbosilane precursors and pitch is obtained; 3, the mixture obtained in the step 2 is placed in a high temperature furnace, air or oxygen is led into the high temperature furnace to oxygenize the mixture, then the mixture is cooled, and cross-linking by-products are obtained; 4, the cross-linking by-products are placed in the high temperature furnace, inert gases are led to the high temperature furnace to carbonize the cross-linking by-products, the cross-linking by-products are cooled, and carbon-scattered magnetic silicon carbide ceramic nano particles are obtained; 5, the carbon-scattered magnetic silicon carbide ceramic nano particles are heated in an air atmosphere to an oxygenolysis decomposition temperature for carbon removing, and the magnetic silicon carbide ceramic nano particles are obtained. The magnetic silicon carbide ceramic nano particles can attenuate certain electromagnetic radiation due to the fact that the magnetic silicon carbide ceramic nano particles have both magnetic loss and dielectric loss, and an electromagnetic wave absorption effect is achieved.

Description

technical field [0001] The invention relates to silicon carbide, in particular to a method for preparing magnetic silicon carbide ceramic nanoparticles. Background technique [0002] Silicon carbide (SiC) is a structural ceramic material with excellent performance. It has high hardness (between corundum and diamond), high temperature strength, good creep resistance, stable chemical properties, high thermal conductivity, and small thermal expansion coefficient. Good wear resistance and other advantages. Parts made of silicon carbide micropowder have better high temperature resistance and wear resistance, and are widely used as structural materials in aviation, aerospace, automobile, machinery, petrochemical and other industrial fields. [0003] In recent years, low-dimensional SiC nanostructures have received extensive attention, such as nanoparticles, nanotubes, and nanobundles. Nanostructured silicon carbide will have a greater impact on its properties, such as optical pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36B82Y30/00
Inventor 刘安华胡志明丁绍楠李风萍刘星煜唐学原
Owner XIAMEN UNIV
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