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

A silicon carbide ceramic and aluminum-based silicon carbide technology, which is applied in the field of silicon carbide ceramic preform and its preparation, aluminum-based silicon carbide ceramic material and its preparation field, can solve the problem of large shrinkage, low strength and poor structural uniformity of ceramic green body. problems, to achieve the effects of reducing environmental hazards, improving yield, and increasing strength

Active Publication Date: 2015-04-08
CHINA BUILDING MATERIALS ACAD
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  • Abstract
  • Description
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  • Application Information

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

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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. Wherein, 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 wat...

Embodiment 1

[0077] Prepare a silicon carbide preform of 65% volume fraction (herein, 65% volume fraction refers to the volume fraction of silicon carbide in the silicon carbide preform, the following is the same); the specific 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. Add 1.2 g of azobisisoheptylcyanide to the raw material slurry, and stir for 30 minutes to obtain a ceramic slurry.

[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 -2 Pa, the time of vacuum degassing is 5 minutes.

[0081] 4. Inject the vacuum-degassed ceramic slurry into a non-porous mold, and place it in an oven ...

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 A raw material slurry was obtained after 24 hours.

[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 perform vacuum degassing on the ceramic slurry; among them, keep the vacuum degree in the vacuum degassing tank at 5×10 -6 Pa, the time of 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...

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Abstract

The invention discloses a silicon carbide ceramic preform, an aluminum-based silicon carbide ceramic material, and a preparation method of the silicon carbide ceramic preform, and relates to the technical fields of materials and preparation thereof, and aims at solving the technical problems that the silicon carbide ceramic preform prepared by an existing preparation process is low in strength, uneven in structure, and low in volume fraction of silicon carbide. According to the main technical scheme, the preparation method comprises the following steps: mixing raw materials for preparing the silicon carbide ceramic preform evenly, so as to prepare a raw material slurry, wherein the raw materials for preparing the silicon carbide ceramic preform comprise silicon carbide, a dispersing agent, an organic monomer and water; introducing an initiator into the raw material slurry, and mixing evenly, so as to obtain ceramic slurry; carrying vacuum degassing treatment, injection molding and demolding drying on the ceramic slurry, so as to obtain a ceramic biscuit; and sintering the ceramic biscuit at 800-1200 DEG C, so as to obtain the silicon carbide ceramic preform. The preparation method is mainly used for preparing the silicon carbide ceramic preform with high strength and uniform structure, so as to prepare the aluminum-based silicon carbide ceramic material with high performance.

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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IPC IPC(8): C04B35/565C04B35/622C04B41/88
Inventor 刘海林黄小婷胡传奇霍艳丽
Owner CHINA BUILDING MATERIALS ACAD
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