Method for preparing ferric oxide ceramic thin film on the surface of three-dimensional network silicon carbide

A technology of network silicon carbide and ceramic film, applied in the field of materials, to achieve the effect of simple preparation method, cheap raw materials, and excellent thermal shock resistance

Inactive Publication Date: 2012-07-04
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xu Suoping and Zhu Guangjun successfully prepared α-Fe2O3 particles using inorganic salts of ferric nitrate and urea as raw materials, and using Sol on a random three-dimensional network (3D) matrix The research on the preparation of iron oxide thin films by -Gel method has not been reported yet

Method used

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  • Method for preparing ferric oxide ceramic thin film on the surface of three-dimensional network silicon carbide
  • Method for preparing ferric oxide ceramic thin film on the surface of three-dimensional network silicon carbide
  • Method for preparing ferric oxide ceramic thin film on the surface of three-dimensional network silicon carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Ferric nitrate is mixed with 0.1mol / L ferric nitrate solution, and urea is added in solution, and the add-on of urea is urea in molar ratio: iron ion=2: 1; The solution that will obtain is heated up under stirring condition, and stirring speed is 100rpm , heat up to 40°C, keep warm for 25min, then cool to room temperature, let stand for 7h, then heat to 70°C, keep warm for 40min to obtain iron-containing sol.

[0029] The three-dimensional network silicon carbide is immersed in the iron-containing sol under vacuum conditions for 30 minutes, then taken out and dried at room temperature for 25 minutes, heated to 55°C for 10 minutes, heated to 75°C for 40 minutes, and the coating is completed.

[0030] The three-dimensional network silicon carbide coated with iron-containing sol was heated to 120°C for 80 minutes, 250°C for 170 minutes, and 400°C for 200 minutes; the heating rate was 2°C / min. A uniform and dense iron oxide film is obtained on the surface of the three-dimen...

Embodiment 2

[0032] Ferric nitrate is mixed with 0.3mol / L ferric nitrate solution, and urea is added in solution, and the add-on of urea is urea in molar ratio: iron ion=3: 1; The solution that will obtain is heated up under stirring condition, and stirring speed is 160rpm , heat up to 50°C, keep warm for 30min, then cool to room temperature, let stand for 7.5h, then heat to 80°C, keep warm for 30min to obtain iron-containing sol.

[0033] The three-dimensional network silicon carbide is immersed in the iron-containing sol under vacuum conditions for 25 minutes, then taken out and dried at room temperature for 15 minutes, heated to 50°C for 15 minutes, heated to 85°C for 30 minutes, and the coating is completed.

[0034] The three-dimensional network silicon carbide coated with iron-containing sol was heated to 140°C for 60 minutes, 300°C for 150 minutes, and 450°C for 170 minutes; the heating rate was 5°C / min. A uniform and dense iron oxide film is obtained on the surface of the three-dim...

Embodiment 3

[0036] Ferric nitrate is mixed with 0.5mol / L ferric nitrate solution, and urea is added in solution, and the add-on of urea is urea in molar ratio: iron ion=4: 1; The solution that will obtain is heated up under stirring condition, and stirring speed is 200rpm , heated up to 55°C, kept warm for 35min, then cooled to room temperature, stood still for 6.5h, then heated to 95°C, kept warm for 20min, and iron-containing sol was obtained.

[0037] The three-dimensional network silicon carbide is immersed in the iron-containing sol under vacuum conditions for 20 minutes, then taken out and dried at room temperature for 10 minutes, heated to 46°C for 25 minutes, heated to 90°C for 20 minutes, and the coating is completed.

[0038] The three-dimensional network silicon carbide coated with iron-containing sol was heated to 180°C for 50 minutes, 340°C for 100 minutes, and 600°C for 150 minutes; the heating rate was 8°C / min. A uniform and dense iron oxide film is obtained on the surface ...

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Abstract

A method for preparing a ferric oxide ceramic thin film on the surface of three-dimensional network silicon carbide belongs to the material technical field, and comprises the following steps: (1) a sol-gel method is adopted for preparing iron sol; (2) a vacuum impregnation method is adopted for coating on 3D-SiC; and (3) the three-dimensional network silicon carbide coated by the iron sol is sintered. The invention uses the low-cost raw material, the simple preparation method and the short preparation period to prepare the uniform and compact ferric oxide ceramic thin film with low porosity onthe 3D-SiC matrix surface; the thin film has stronger bonding strength with the matrix and has excellent thermal shock resistance, thus realizing to control the interface reaction of the 3D-SiC / steel.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing an iron oxide ceramic thin film on the surface of a three-dimensional network silicon carbide. Background technique [0002] Recently, a new network interpenetrating metal-ceramic composites (interpenetrating phase composites) has attracted people's attention. The characteristic of the new composite material is that the matrix and the reinforcing phase form their respective three-dimensional space continuous network structures in the whole material and are intertwined with each other. They are sometimes called C4 materials (co-continuous ceramic composites). Because the ceramic phase is used as a reinforcing phase to improve wear resistance or fracture strength, and the metal phase can improve electrical conductivity or plasticity, the C4 material has higher mechanical strength and better toughness than traditional composite materials, showi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87
Inventor 茹红强武艳君闫海乐马娅娜喻亮岳新艳房明
Owner NORTHEASTERN UNIV LIAONING
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