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A preparation method of silicon carbide nanowire reinforced silicon carbide ceramic composite material with high strength and high toughness

A technology of silicon carbide nanowires and silicon carbide ceramics is applied in the field of silicon carbide ceramic matrix composite materials, which can solve the problem of high bonding strength and achieve the effect of increasing dispersibility

Active Publication Date: 2021-07-20
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of silicon carbide nanowire reinforced silicon carbide ceramic composite material with high strength and high toughness, so as to overcome the interface bonding between silicon carbide nanowire and silicon carbide ceramic matrix in the prior art Defects of too high strength

Method used

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  • A preparation method of silicon carbide nanowire reinforced silicon carbide ceramic composite material with high strength and high toughness
  • A preparation method of silicon carbide nanowire reinforced silicon carbide ceramic composite material with high strength and high toughness
  • A preparation method of silicon carbide nanowire reinforced silicon carbide ceramic composite material with high strength and high toughness

Examples

Experimental program
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Effect test

Embodiment 1

[0052] (1) Add 1g of silicon carbide nanowires and 1mL of 3-aminopropyl-triethoxysilane into 150mL of toluene, heat to reflux and continue to stir for 6h, then filter with suction and dry at 60°C for 2h to obtain dry Modified silicon carbide nanowires.

[0053] (2) Evenly disperse 0.1g of modified silicon carbide nanowires, 0.2g of resorcinol and 97mL of formaldehyde in a solution consisting of 80mL of deionized water, 32mL of absolute ethanol and 0.4mL of ammonia water, and use magnetic stirring for 24h , and then suction filtered and freeze-dried for 12 hours to obtain silicon carbide nanowires coated with phenolic resin coating.

[0054] (3) the silicon carbide nanowire coated with phenolic resin coating obtained in step (2) is raised to 350° C. with a heating rate of 2° C. / min in a horizontal tube furnace with helium as the protective gas, Then keep it warm for 2 hours, then raise it to 650° C. at 2° C. / min, keep it warm for 2 hours, and then lower the temperature natural...

Embodiment 2

[0060] According to Example 1, steps (1), (3), and (5) of this example are the same as Example 1, and the quality of Resorcinol in Step (2) of Example 1 is changed to 0.3g, and the volume of formaldehyde is changed to 145mL, change the net content of silicon carbide nanowires in the composite ceramic powder in step (4) of Example 1 to 7wt.%, change the carbon content to 3.76wt.%, and the rest are the same as in Example 1, and the obtained composite ceramic The block is a disc-shaped block with a diameter of 10 mm and a thickness of about 1 mm. The MSP strength measured by the MSP test method is 901 MPa; and the fracture toughness is calculated by the indentation of the Vickers hardness tester on the polished surface of the composite ceramic sample. 5.01MPa·m 1 / 2 .

[0061] image 3 It shows that: in the transmission electron microscope image of the silicon carbide nanowire coated with carbon coating in this embodiment, the carbon coating is evenly coated on the surface of th...

Embodiment 3

[0064] Step (1) is identical with embodiment 1 step (1).

[0065] (2) Evenly disperse 0.1g of modified silicon carbide nanowires, 0.4g of resorcinol and 193mL of formaldehyde in a solution consisting of 80mL of deionized water, 32mL of absolute ethanol and 0.4mL of ammonia water, and use magnetic stirring for 24h , and then suction filtered and freeze-dried for 12 hours to obtain silicon carbide nanowires coated with phenolic resin coating.

[0066] Step (3) is identical with embodiment 1 step (3).

[0067] (4) After measuring the carbon content (wt.%) and the content of silicon carbide nanowires in the carbon coating-coated silicon carbide nanowires in step (3) by thermogravimetric analysis, design the silicon carbide ceramic powder for each Component specific gravity, make the net content of silicon carbide nanowire in composite ceramic powder body be 7wt.%, carbon content is 5.28wt.%, sintering aid is aluminum oxide and boron carbide, and its total mass ratio is 10wt.% (al...

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Abstract

The invention relates to a method for preparing a high-strength and high-toughness silicon carbide nanowire-reinforced silicon carbide ceramic composite material, comprising: preparing silicon carbide nanowires modified by a silane coupling agent, and preparing silicon carbide nanowires coated with a phenolic resin coating , Preparation of carbon-coated silicon carbide nanowires, preparation of silicon carbide nanowire-reinforced silicon carbide ceramic composites. This method ensures the effective transfer of load between the silicon carbide ceramic matrix and the nanowire reinforcement, and the carbon coating on the surface of the silicon carbide nanowire can effectively protect the inner silicon carbide nanowire from reacting with the matrix during high-temperature sintering. destroy.

Description

technical field [0001] The invention belongs to the field of silicon carbide ceramic-based composite materials, in particular to a preparation method of a silicon carbide nanowire-reinforced silicon carbide ceramic composite material with high strength and high toughness. Background technique [0002] Silicon carbide ceramic matrix composites have the advantages of high strength, high hardness, chemical corrosion resistance, and low thermal expansion coefficient. Half of it has great application potential in high-temperature components in the aerospace field, so it has been paid more and more attention by people, but its brittleness problem limits the application of this type of material in many high-end fields. In order to solve the disadvantage of high brittleness of silicon carbide ceramic composites, silicon carbide nanowires are used as reinforcements to introduce silicon carbide ceramic matrix into silicon carbide ceramic composites, which can combine the advantages of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622C04B35/628C04B35/645C04B35/65
CPCC04B35/565C04B35/573C04B35/575C04B35/622C04B35/62873C04B2235/3217C04B2235/3225C04B2235/3821C04B2235/424C04B2235/5244C04B2235/96
Inventor 范宇驰颜鹏燕文强王连军江莞
Owner DONGHUA UNIV
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