O-Sialon porous material prepared by gel-casting and preparation method thereof

A porous material, gel injection molding technology, applied in the field of porous ceramic materials, can solve the problems of uneven distribution of pore structure and difficult control of porosity.

Inactive Publication Date: 2014-03-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a preparation method of porous ceramics through in-situ sintering by combining the gel injection molding method with the addition of a second phase that is difficult to sinter, so as to solve the problem of uneven distribution of pore structures in the traditional preparation methods of porous ceramics. Uniformity, the porosity is not easy to control the problem, and improve the dielectric properties of the material

Method used

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  • O-Sialon porous material prepared by gel-casting and preparation method thereof
  • O-Sialon porous material prepared by gel-casting and preparation method thereof
  • O-Sialon porous material prepared by gel-casting and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: with α-Si 3 N 4 , SiO 2 , Al 2 o 3 , h‐BN as raw material, with Y 2 o 3 and MgO as a sintering aid, where D of h‐BN 50 0.1 μm.

[0028] (1) Ingredients: According to the powder mass ratio Si 3 N 4 : SiO 2 :Al 2 o 3 : BN=58 parts: 26 parts: 4 parts: 5 parts of ingredients, then add 4 parts of Y 2 o 3 and 3 parts of MgO, mixed evenly to obtain a composite powder.

[0029] (2) Preparation of slurry: according to the mass ratio AM: MBAM: H 2 O=10 parts: 2 parts: 88 parts Prepare the premix, add 90 parts of the composite powder prepared in step (1) to 100 parts of the premix, add 3 parts of dispersant, and mix in the stirring mill for 3 hours.

[0030] (3) Preparation of green body: After vacuum defoaming the suspension, add 2 parts of 0.02g / ml catalyst and 6 parts of 0.01g / ml initiator into the slurry, mix well, and then inject the slurry into the mold , room temperature curing molding, demoulding. Put the demoulded body into a closed space, a...

Embodiment 2

[0034] Embodiment 2: with α-Si 3 N 4 , SiO 2 , Al 2 o 3 , h‐BN as raw material, with Y 2 o 3 and MgO as a sintering aid, where D of h‐BN 50 is 1 μm.

[0035] (1) Ingredients: According to the powder mass ratio Si 3 N 4 : SiO 2 :Al 2 o 3 :BN=48:20:11:15 Ingredients, add 3 parts of Y 2 o 3 and 3 parts of MgO, mixed evenly to obtain a composite powder.

[0036] (2) Preparation of slurry: according to the mass ratio AM: MBAM: H 2 O=7 parts: 1 part: 92 parts Prepare the premix, add 100 parts of the composite powder prepared in step (1) to 100 parts of the premix, add 5 parts of dispersant, and ball mill for 2 hours.

[0037] (3) Preparation of green body: After vacuum defoaming the suspension, add 4 parts of 0.02g / ml catalyst and 8 parts of 0.03g / ml initiator into the slurry, mix well, and then inject the slurry into the mold , room temperature curing molding, demoulding. Put the demoulded body into a closed space, avoid air flow, place it for more than 24 hours, a...

Embodiment 3

[0041] Embodiment 3: with α-Si 3 N 4 , SiO 2 , Al 2 o 3 , h‐BN as raw material, with Y 2 o 3 and MgO as a sintering aid, where D of h‐BN 50 is 6 μm.

[0042] (1) Ingredients: According to the powder mass ratio Si 3 N 4 : SiO 2 :Al 2 o 3 :BN=52:22:12:10 ingredients, add 3 parts of Y 2 o 3 and 1 part of MgO, mixed evenly to obtain a composite powder.

[0043] (2) Preparation of slurry: according to the mass ratio AM: MBAM: H 2 O=12 parts: 3 parts: 85 parts Prepare the premix, add 80 parts of the powder prepared in step (1) to 100 parts of the premix, then add 2 parts of dispersant, and mix in the stirring mill for 4 hours.

[0044] (3) Preparation of green body: After vacuum defoaming the suspension, add 1 part of 0.03g / ml catalyst and 5 parts of 0.02g / ml initiator into the slurry, mix well, and then inject the slurry into the mold , room temperature curing molding, demoulding. Put the demoulded body into a closed space, avoid air flow, place it for more than 24...

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Abstract

The invention relates to an O-Sialon porous material prepared by gel-casting and a preparation method thereof. The preparation method mainly comprises the following steps: preparing suspensoid slurry, preparing a green body, drying, exhausting rubber and sintering. Alpha-Si3N4, Al2O3, SiO2, Y2O3, MgO and h-BN are taken as raw materials, and the O-Sialon porous material is prepared by a way of combining gel-casting and adding of hard-to-sinter phase (h-BN) of a second phase through an in-situ synthesis technology; the O-Sialon porous material has the density of 1.1 g.cm<-3>-1.6 g.cm<-3>, the porosity between 46% and 64%, the room temperature three-point bending strength between 30 MPa and 82 MPa, a dielectric constant between 2.1 and 4.5, and a tangential value of dielectric loss between 0.112*10<-3>-0.702*10<-3>.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic materials, and specifically relates to a preparation method of O-Sialon porous material by gel injection molding. The material has low high-frequency dielectric constant and dielectric loss, and has a low volume Density, with relatively high bending strength, can be used as a wave-transparent material for radome. Background technique [0002] The radome is a component used to protect the antenna system. The radome must have the following properties: low weight, high enough strength, good thermal shock resistance, good rain erosion resistance, good heat resistance; especially , it is required that the radome material must have good wave-transmitting properties, so it is required that the radome material should also have a low dielectric constant and low dielectric loss. U.S.Pat.No.4358772 (Leggett H.Ceramic broadband radome: U.S.Patent4,358,772[P].1982-11-9.) pointed out that for the radome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/599C04B35/622
Inventor 韩霄翠李晓雷
Owner TIANJIN UNIV
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