Near-net size preparation method of porous silicon nitride/silicon oxynitride ceramic composites

A technology of ceramic composite materials and silicon oxynitride, which is applied in the direction of ceramic products, applications, household appliances, etc., and can solve problems such as large shrinkage

Inactive Publication Date: 2011-12-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In order to solve the problem of Si 3 N 4 In the sintering process, the shrinkage of the ceramic green body is relatively large, and a method for preparing a porous silicon nitride / silicon oxynitride ceramic composite material with a near-net size is provided

Method used

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specific Embodiment approach 1

[0006] Specific implementation method one: the near-net size preparation method of porous silicon nitride / silicon oxynitride ceramic composite material in this embodiment is realized according to the following steps: 1. 92 to 96 parts of silicon nitride, 3 to 3 parts by weight 6 parts of yttrium oxide and 1 to 2 parts of aluminum oxide are mixed, and the porous silicon nitride green body is prepared according to the gel injection molding method; Raise the temperature to 1350-1400°C at a heating rate of ~15°C / min, and pre-sinter at a temperature of 1350-1400°C for 15-60 minutes; 3. Put the product obtained in step 2 into a vacuum chamber, and then evacuate the vacuum chamber to a vacuum Introduce the silica sol into the vacuum chamber, soak for 2-4 hours, take it out and gel it at 55-65°C for 15-25 hours, then dry it at 115-125°C for 3-5 hours; 4. Repeat step 3 0-2 times; 5. Heat the product obtained in step 4 to 1500-1700°C at a heating rate of 10-15°C / min under an argon or ni...

specific Embodiment approach 2

[0010] Embodiment 2: This embodiment differs from Embodiment 1 in that the pre-sintering temperature in step 2 is 1360-1380°C. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Embodiment 3: This embodiment is different from Embodiment 1 in that the pre-sintering temperature in step 2 is 1350°C. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for preparing a near-net size of a porous silicon nitride / silicon oxynitride ceramic composite material, which relates to a method for preparing a near-net size of the composite material. The invention solves the problem that the shrinkage rate of the Si3N4 ceramic green body is relatively large during the sintering process. The method is as follows: preparing a porous silicon nitride green body; pre-sintering the green body; impregnating, gelling, drying; and sintering to obtain the porous silicon nitride / silicon oxynitride ceramic composite material. The porous silicon nitride / silicon oxynitride ceramic composite material prepared by the method of the invention can reduce the shrinkage rate of the green body during sintering while meeting the mechanical property requirements. The method of the invention has the advantages of simple process, low cost and good repeatability.

Description

technical field Background technique [0001] Silicon nitride has excellent mechanical properties and can be used to make knives. Porous silicon nitride ceramics with controllable microstructure have light weight, large damage tolerance, high thermal shock resistance, low dielectric constant and dielectric loss, and can be used for structure-heat protection-wave transmission integration material. Preparation of Si by colloidal molding method 3 N 4 or Si 3 N 4 Based ceramics have been around for many years, and oxide ceramics such as Al 2 o 3 The difference is that Si 3 N 4 The surface of the powder is very complex, and a high volume fraction of Si is obtained 3 N 4 The suspension is not easy, and the density of the green body is relatively low, so Si 3 N 4 During the sintering process, the shrinkage rate of the ceramic green body is relatively large, which will also make the subsequent processing time-consuming and increase the cost. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87C04B38/00C04B35/597C04B35/584
Inventor 贾德昌邵颖峰周玉
Owner HARBIN INST OF TECH
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