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Porous silicon nitride ceramic and production method thereof

A technology of silicon nitride ceramics and silicon nitride powder, which is applied in the preparation of porous silicon nitride ceramics by self-propagating method, porous silicon nitride ceramics and the preparation of porous silicon nitride ceramics by self-propagating method, to achieve industrial scale Production, high intensity, short time effect

Active Publication Date: 2014-07-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the preparation of bulk ceramic materials by self-propagating method.

Method used

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  • Porous silicon nitride ceramic and production method thereof
  • Porous silicon nitride ceramic and production method thereof
  • Porous silicon nitride ceramic and production method thereof

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preparation example Construction

[0028] In the preparation method of the porous silicon nitride ceramics provided by the present invention, by ball milling silicon powder, silicon nitride powder and sintering aid in a ball mill jar to make it evenly mixed, and drying and passing through a 80-200 mesh sieve to obtain A mixture of certain fineness silicon powder, silicon nitride powder, and sintering aids. Wherein, the ball milling time may be 1 to 24 hours. In addition, the ratio of silicon powder to silicon nitride powder in the mixture of silicon powder, silicon nitride powder and sintering aid can be 9-5:1-5; the ratio is preferably 7-5:3-5. Also, the sintering aid can be Y 2 o 3 , Yb 2 o 3 、Lu 2 o 3 、Nd 2 o 3 、Er 2 o 3 one or more of them.

[0029] In the preparation method of the porous silicon nitride ceramic provided by the present invention, when the molded body having a certain shape after molding is subjected to nitriding treatment, in order to promote the formation of the molded body obta...

Embodiment 1

[0035] Using ethanol as a solvent and silicon nitride balls as a ball milling medium, silicon powder, silicon nitride powder and yttrium oxide were ball milled in a ball mill jar for 24 hours at a mass ratio of 70:30:6. The uniformly mixed slurry was dried in an oven at 60°C, and then passed through a 100-mesh sieve. The sieved powder was pressed into a porous green body with a stainless steel mold of 10 MPa. The green body is buried in the silicon / silicon nitride buried powder with the same ratio, put into the self-propagating reaction chamber, nitrogen gas is introduced, and it is synthesized by ignition and combustion. The reaction time is 4 minutes. After the synthesis, it is naturally cooled in the furnace; Know: the porosity of the porous silicon nitride ceramic material that the present embodiment makes is 54%, and flexural strength is 120MPa; figure 1 It is the XRD figure of the porous silicon nitride ceramic material after the self-propagating reaction in embodiment ...

Embodiment 2

[0037] Using ethanol as a solvent and silicon nitride balls as a ball milling medium, silicon powder, silicon nitride powder and ytterbium oxide were ball milled in a ball mill jar for 24 hours at a mass ratio of 50:50:6. The uniformly mixed slurry was dried in an oven at 60°C, and then passed through a 100-mesh sieve. The sieved powder is pressed into a porous green body with a stainless steel mold of 5 MPa. The porous green body is buried in the silicon / silicon nitride buried powder with the same ratio, put into the self-propagating reaction chamber, and nitrogen gas is introduced, and it is synthesized by ignition and combustion. The reaction time is 3 minutes, and it is naturally cooled in the furnace after synthesis;

[0038] After testing, it is known that the porosity of the porous silicon nitride ceramic material prepared in this embodiment is 59%, and the flexural strength is 110MPa;

[0039] see image 3 , which shows the scanning electron micrograph of the porous ...

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Abstract

The invention relates to porous silicon nitride ceramic and a production method thereof. A product of the porous silicon nitride ceramic has silicon nitride in beta-phase silicon nitride crystal form in cylinder or rod shape. The product is 20-65% in total porosity and 450-50MPa in bending strength. The silicon nitride in the product of porous silicon nitride ceramic is in the beta-phase crystal form in the cylinder or rod shape, and strength and toughness of the product can be improved further.

Description

technical field [0001] The invention belongs to the field of porous silicon nitride ceramics, and relates to a porous silicon nitride ceramic and a method for preparing porous silicon nitride ceramics by a self-propagating method, and more specifically relates to using silicon powder and silicon nitride powder as raw materials, through self-propagating A method for preparing porous silicon nitride ceramics. Background technique [0002] Due to the characteristics of light weight, high temperature resistance, and corrosion resistance, porous silicon nitride ceramic materials have broad application prospects in the fields of high-temperature gas filtration, sensors, catalyst supports, and separation membranes. Therefore, the preparation method of porous silicon nitride ceramics has become One of the current research hotspots. However, most of the current research uses expensive silicon nitride powder as raw material to prepare porous silicon nitride ceramic materials through ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/584C04B35/622
Inventor 曾宇平姚冬旭
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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