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Nanometer composite silicon carbide ceramic and preparation method thereof

A technology of composite silicon carbide and silicon carbide, which is applied in the field of nanocomposite silicon carbide ceramics and its preparation, can solve the problems affecting the performance of nanocomposite ceramics, the inability of uniform dispersion of nanoparticles, and the difficulty of industrial production, etc., to achieve increased toughness, The size is small and uniform, and the effect of inhibiting growth

Active Publication Date: 2008-01-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] 1) The mechanical mixing method is currently the most widely used and easiest method for preparing composite powders. However, due to the large specific surface area of ​​nano-powders, agglomeration and sedimentation are very easy to occur during the drying process after ball milling, resulting in the formation of nano-particles. If it cannot be uniformly dispersed, it will eventually affect the performance of nanocomposite ceramics
[0006] 2) At present, the sintering of nano-composite ceramics mostly uses sintering methods such as hot pressing sintering, hot isostatic pressing sintering, and discharge plasma sintering. These methods have high requirements for sintering equipment, and the process is complicated and costly. Difficult to achieve industrial production

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  • Nanometer composite silicon carbide ceramic and preparation method thereof

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Embodiment 1

[0027] Embodiment 1: A preparation method of nanocomposite silicon carbide ceramics, with 85 parts of silicon carbide, 5 parts of yttrium aluminum garnet, 5 parts of nano silicon carbide and 5 parts of nano titanium carbide as the main raw materials, the following steps are carried out in sequence:

[0028] 1) Add the above-mentioned main raw materials, 2 parts of phenolic resin, 0.5 parts of PVA and 1 part of PEG into 200 parts of deionized water, and mix them by ball milling for 5 hours to prepare a water-based silicon carbide slurry;

[0029] 2) Spray-dry the above-mentioned water-based silicon carbide slurry by spray granulation process to obtain silicon carbide powder granules; the process conditions of spray granulation are as follows: the slurry flow rate is 6Kg / h, and the hot air inlet temperature is 200°C;

[0030] 3) The above-mentioned silicon carbide powder granules are molded in a two-step manner of 100MPa dry pressure pre-pressure and 250MPa cold isostatic final p...

Embodiment 2

[0033] Embodiment 2: A preparation method of nanocomposite silicon carbide ceramics, with 80 parts of silicon carbide, 8 parts of yttrium aluminum garnet, 5 parts of nano silicon carbide, 2 parts of nano titanium carbide and 5 parts of nano titanium nitride as the main raw materials, Follow the steps in order:

[0034] 1) Add the above-mentioned main raw materials, 3 parts of phenolic resin, 2 parts of PVA and 1.5 parts of PEG into 150 parts of deionized water, and mix them by ball milling for 10 hours to prepare a water-based silicon carbide slurry;

[0035] 2) Spray-dry the above-mentioned water-based silicon carbide slurry by using a spray granulation process to obtain silicon carbide powder granules; the process conditions of the spray granulation are as follows: the slurry flow rate is 4Kg / h, and the hot air inlet temperature is 225°C;

[0036] 3) The above-mentioned silicon carbide powder granules are molded in a two-step manner of 100MPa dry pressure pre-pressure and 25...

Embodiment 3

[0039] Embodiment 3: A kind of preparation method of nanocomposite silicon carbide ceramics, with 75 parts of silicon carbide, 10 parts of yttrium aluminum garnet, 5 parts of nano-silicon carbide, 5 parts of nano-titanium carbide and 5 parts of nano-titanium nitride to form the main raw material, Follow the steps in order:

[0040]1) Add the above-mentioned main raw materials, 0.5 parts of dextrin, 1 part of PVA and 0.5 parts of TMAH into 90 parts of deionized water, and mix them by ball milling for 20 hours to prepare a water-based silicon carbide slurry;

[0041] 2) Spray-dry the above-mentioned water-based silicon carbide slurry by using a spray granulation process to obtain silicon carbide powder granules; the process conditions for spray granulation are as follows: the slurry flow rate is 3Kg / h, and the hot air inlet temperature is 250°C;

[0042] 3) The above-mentioned silicon carbide powder granules are molded in a two-step manner of 100MPa dry pressure pre-pressure and...

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Abstract

This invention discloses a method for preparing nanometer complex silicon carbide ceramics. The production procedures are: (1), the main raw materials (silicon carbide, yttrium aluminium garnet), adhesion agent, water-soluble high molecular mixture sol, dispersing agent are added into de-ionized water, mixed by ball-milling, to produce water-based silicon carbide slurry with its solid content of 30-60%; (2), proceeding spray-drying to obtain powder; (3), two-step formation to obtain blank of silicon carbide; (4), being sintered in vacuum sintering furnace to obtain the final product. This inventive method is of simple process and the inventive product is with excellent properties.

Description

technical field [0001] The invention relates to a silicon carbide ceramic and a preparation method thereof, in particular to a nanocomposite silicon carbide ceramic and a preparation method thereof. Background technique [0002] As a high-temperature structural ceramic, silicon carbide ceramics have many excellent properties, such as wear resistance, high thermal conductivity and electrical insulation, semiconductor and electrical conductivity, heat resistance, corrosion resistance, and high-temperature mechanical and thermal properties. Silicon carbide ceramics have been widely used in machinery, electronics, petrochemical, metallurgy and other industrial fields, as well as the national defense industry, and have been recognized internationally as the fourth basic material since metal, alumina, and cemented carbide. Although silicon carbide ceramics have many properties and are also used in many fields, their low room temperature strength, insufficient toughness, and diffic...

Claims

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Application Information

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IPC IPC(8): C04B35/576C04B35/577
Inventor 郭兴忠杨辉李海淼傅培鑫高黎华
Owner ZHEJIANG UNIV
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