Preparation method of reaction-bonded silicon carbide

A technology of sintering silicon carbide and silicon carbide, which is applied in the field of inorganic materials, can solve problems such as unstable performance and difficult machining, and achieve low viscosity and good stability

Inactive Publication Date: 2016-02-10
洛阳暖盈电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problem of unstable performance and difficult machining of silicon carbide materials after sintering, and provide a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Prepare the premix: dissolve the organic monomer (AM) and crosslinking agent (MBAM) in deionized water in a certain proportion, add the dispersant PVP, and stir with a constant temperature magnetic stirrer to make the premix evenly mixed.

[0014] 2. Mixing ball milling: Put the premixed solution and carbon black into a ball milling tank, and after planetary ball milling for 1 hour, add silicon carbide powder and dispersant TMAH, and ball milling for 2 hours to prepare a certain solid fraction of silicon carbide / carbon black. slurry.

[0015] 3. Vacuum degassing: Air bubbles are often generated in the slurry during ball milling, so the obtained slurry needs to be degassed by vacuuming. The slurry was degassed for 15 minutes at a vacuum degree of -0.1MPa to completely eliminate the air bubbles in the slurry and increase the density of the green body.

[0016] 4. Injection molding: Add the initiator ammonium persulfate (APS) into the above slurry (because the persulfu...

Embodiment 2

[0020] 1. Prepare the premix: dissolve the organic monomer (AM) and crosslinking agent (MBAM) in deionized water in a certain proportion, add the dispersant PVP, and stir with a constant temperature magnetic stirrer to make the premix evenly mixed.

[0021] 2. Mixing ball milling: Put the premixed solution and carbon black into a ball milling tank, and after 1.5 hours of ball milling in a planetary ball mill, add silicon carbide powder and dispersant TMAH, and ball mill for 3 hours to prepare a certain solid fraction of silicon carbide / carbon black. slurry.

[0022] 3. Vacuum degassing: Air bubbles are often generated in the slurry during ball milling, so the obtained slurry needs to be degassed by vacuuming. The slurry was degassed for 15 minutes at a vacuum degree of -0.1MPa to completely eliminate the air bubbles in the slurry and increase the density of the green body.

[0023] 4. Injection molding: Add the initiator ammonium persulfate (APS) into the above slurry (becaus...

Embodiment 3

[0027] 1. Prepare the premix: dissolve the organic monomer (AM) and crosslinking agent (MBAM) in deionized water in a certain proportion, add the dispersant PVP, and stir with a constant temperature magnetic stirrer to make the premix evenly mixed.

[0028] 2. Mixing ball milling: Put the premixed solution and carbon black into a ball milling tank, and after 2 hours of ball milling in a planetary ball mill, add silicon carbide powder and dispersant TMAH, and ball mill for 4 hours to prepare a certain solid fraction of silicon carbide / carbon black. slurry.

[0029] 3. Vacuum degassing: Air bubbles are often generated in the slurry during ball milling, so the obtained slurry needs to be degassed by vacuuming. The slurry was degassed for 15 minutes at a vacuum degree of -0.1MPa to completely eliminate the air bubbles in the slurry and increase the density of the green body.

[0030] 4. Injection molding: Add the initiator ammonium persulfate (APS) into the above slurry (because ...

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Abstract

The invention provides a preparation method of reaction-bonded silicon carbide. A monomer, a crosslinking agent dispersant and a raw material are mixed in a ball milling mode, silicon carbide/ carbon black water-based suspensoid of a high solid-phase content and low adhesion is obtained, a green body is formed through a gel injection molding process, and the silicon carbide is obtained after a high-temperature reaction. By means of the preparation method, the silicon carbide in a complex shape can be prepared, sintering time is short, and the preparation method is suitable for preparing large-size silicon carbide products and low in cost.

Description

technical field [0001] The invention belongs to the field of inorganic materials, in particular to a preparation method of reaction sintered silicon carbide (RBSC). Background technique [0002] Reaction sintered SiC ceramics have excellent physical and chemical properties and are widely used in petrochemical, aerospace, machinery manufacturing, microelectronics, automobiles, steel, nuclear industries and other fields. [0003] At present, the industrial production of reaction sintered silicon carbide mostly adopts the slip-casting molding process. The main disadvantages of this molding process are low body strength, large drying shrinkage, and uneven density distribution of the green body, resulting in low yield and poor dimensional accuracy of the products. question. It is not conducive to the preparation and large-scale production of samples with complex shapes. [0004] The gel injection molding process has attracted much attention because it overcomes the shortcomings...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
Inventor 贾留宽韩建乐尚波
Owner 洛阳暖盈电子技术有限公司
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