Silicon carbide ceramic perform, aluminum-based silicon carbide ceramic material, and preparation method of same

A technology of silicon carbide ceramics and aluminum-based silicon carbide, which is applied in ceramic products, ceramic molding machines, manufacturing tools, etc., can solve the problems of large shrinkage, low strength, and poor structural uniformity of ceramic green bodies, and reduce environmental hazards , Improve the yield, improve the effect of strength

Inactive Publication Date: 2017-12-22
SUZHOU NORETA NEW MATERIAL TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, the inventors found that the aluminum-based silicon carbide ceramic preform prepared by the dry pressing molding process has low strength and poor structural uniformity, and it is impossible to prepare high-performance aluminum-based silicon carbide that meets the requirements of use in the later stage.
The injection molding process requires a large amount of organic binder, and the shrinkage of the ceramic green body is large, so it is impossible to prepare a high volume fraction of silicon carbide ceramic material (currently the volume fraction of silicon carbide is basically less than 60%), so it is also impossible to achieve a later stage. High-performance aluminum-based silicon carbide ceramic materials required for use

Method used

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  • Silicon carbide ceramic perform, aluminum-based silicon carbide ceramic material, and preparation method of same
  • Silicon carbide ceramic perform, aluminum-based silicon carbide ceramic material, and preparation method of same
  • Silicon carbide ceramic perform, aluminum-based silicon carbide ceramic material, and preparation method of same

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preparation example Construction

[0048] Specifically, an embodiment of the present invention provides a method for preparing a silicon carbide ceramic preform, the method mainly adopts a gel injection molding process, such as figure 1 As shown, it mainly includes the preparation of raw material slurry, adding initiator to the raw material slurry, vacuum degassing, injection molding and curing so that the monomer is polymerized into a macromolecular gel, demolding and drying, and sintering treatment steps, specifically including the following :

[0049] 1) Mixing the raw materials for preparing the silicon carbide ceramic preform evenly to prepare a raw material slurry. Among them, the raw materials for preparing the silicon carbide ceramic preform include silicon carbide, dispersant, organic monomer and water.

[0050] In this step, the volume ratio of silicon carbide to raw material slurry is (40-70):100. The mass ratio of dispersant to silicon carbide is (0.5-2):100. The mass ratio of organic monomer to ...

Embodiment 1

[0077] Prepare a silicon carbide preform of 65% volume fraction (herein, 65% volume fraction refers to the volume fraction that silicon carbide occupies in the silicon carbide preform, the following is the same reason); Concrete steps are as follows:

[0078] 1. Add 208.6 grams of silicon carbide particles with a particle size of 3-20 microns, 4 grams of acrylamide monomer, 1 gram of methylenebisacrylamide, 30 grams of water, and 2 grams of ammonia water into a stirring tank, and stir for 24 hours to obtain Raw material slurry.

[0079] 2, 1.2 gram of azobisisoheptyl cyanide is added in the raw material slurry, after stirring for 30 minutes, ceramic slurry is obtained.

[0080] 3. Place the ceramic slurry in a vacuum degassing tank, and perform vacuum degassing on the ceramic slurry; among them, keep the vacuum degree in the vacuum degassing tank at 5×10-2Pa, and the time for vacuum degassing is 5 minutes .

[0081] 4. Inject the vacuum-degassed ceramic slurry into a non-por...

Embodiment 2

[0084] Prepare a silicon carbide preform with a volume fraction of 60%; the specific steps are as follows:

[0085] 1. Add 1926 grams of silicon carbide particles with a particle size of 10 microns, 66 grams of carbon powder, 40 grams of acrylamide monomer, 10 grams of methylenebisacrylamide, 320 grams of water, and 19 grams of ammonia water into the mixing tank, and stir After 24 hours a slurry of raw material was obtained.

[0086] 2. Add 11 grams of azobisisoheptylcyanide to the raw material slurry, and stir for 30 minutes to obtain a ceramic slurry.

[0087] 3. Place the ceramic slurry in a vacuum degassing tank, and vacuum degas the ceramic slurry; among them, keep the vacuum degree in the vacuum degassing tank at 5×10-6Pa, and the time for vacuum degassing is 5 minutes .

[0088] 4. Inject the vacuum-degassed ceramic slurry into a non-porous mold, and place it in an oven at 70°C for 3 hours to keep the ceramic slurry solidified, and then place it in a dry phase to dry ...

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Abstract

The invention discloses a silicon carbide ceramic prefabricated body, an aluminum-based silicon carbide ceramic material and a preparation method thereof, relates to the technical field of materials and preparation thereof, and solves the problem of low strength and poor structure of the silicon carbide ceramic prefabricated body prepared by the existing preparation technology. Uniform and low volume fraction of silicon carbide technical problems. The main technical scheme of the present invention is: uniformly mixing the raw materials for preparing silicon carbide ceramic preforms to obtain raw material slurry; the raw materials for preparing silicon carbide ceramic preforms include silicon carbide, dispersant, organic monomer and water; Add it to the raw material slurry, and mix it evenly to obtain a ceramic slurry; the ceramic slurry is subjected to vacuum degassing treatment, injection molding, demolding and drying in sequence to obtain a ceramic green body; Sintering treatment to obtain a silicon carbide ceramic preform. The invention is mainly used for preparing a high-strength and uniformly structured silicon carbide ceramic prefabricated body, and further preparing a high-performance aluminum-based silicon carbide ceramic material.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a silicon carbide ceramic preform and a preparation method thereof, an aluminum-based silicon carbide ceramic material and a preparation method thereof. Background technique [0002] Aluminum-based silicon carbide ceramics (SiCp / Al) composites combine the excellent properties of silicon carbide ceramics and aluminum alloys, and have the characteristics of high specific strength, good thermal conductivity, and low expansion coefficient. They are used in electronic packaging, aerospace, military, automotive and other fields have a wide range of applications. The preparation process of aluminum-based silicon carbide ceramic materials mainly includes pressureless infiltration process and stirring casting process. Among them, the stirring casting process is mainly to continuously add silicon carbide particles into molten aluminum, fuse silicon carbide particles and alumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626C04B35/622C04B41/88C04B35/624C04B38/06C04B35/634B28B1/00
CPCC04B35/565B28B1/00C04B35/622C04B35/624C04B35/6264C04B35/63444C04B38/067C04B38/068C04B41/5155C04B41/88C04B2235/6023C04B2235/96
Inventor 马少杰杨小猛
Owner SUZHOU NORETA NEW MATERIAL TECH
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