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Method for preparing foam silicon nitride ceramics

A technology of silicon nitride ceramics and silicon nitride, which is applied in the field of preparation of silicon nitride ceramics, can solve the problems of low compressive strength, high cost, and high thermal conductivity of materials, and achieve low raw material costs, improved thermal conductivity, and high thermal conductivity. good thermal performance

Inactive Publication Date: 2010-01-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the prior art of complex preparation process, high cost, low material compressive strength, high thermal conductivity, and difficulty in controlling the porosity of foamed silicon nitride ceramics, and to provide a foamed silicon nitride ceramic Preparation method of silicon ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0008] Specific embodiment one: the present embodiment prepares a kind of foamed silicon nitride ceramics and realizes according to the following steps: 1, mix 30%~42% silicon nitride and 58%~70% water ball mill by volume percentage for 5~8h, Obtain a silicon nitride suspension; 2. Mix and stir 85% to 90% of the silicon nitride suspension and 10% to 15% of the gelling agent at 55 to 60°C by volume percentage to obtain a mixed solution; 3. Press Mix 35% to 65% of the mixed liquid and 35% to 65% of the hollow microspheres of fly ash and stir for 20 to 30 minutes to obtain a suspended mucus with a viscosity of 0.5 to 1 Pa·s; 4. Inject the suspended mucus into the mold , solidify and dry at room temperature for 1 to 2 hours, then demould, and then dry in a ventilated place at room temperature for 24 to 36 hours to obtain a dried green body; 5. Put the dried green body into an atmosphere sintering furnace, fill with protective gas, and Under the pressure of ~0.3MPa, the temperature...

specific Embodiment approach 2

[0009] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the purity of the silicon nitride raw material used in step 1 is 95-99%. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0010] Embodiment 3: This embodiment is different from Embodiment 1 in that in step 1, 40% silicon nitride and 60% water ball mill are mixed for 6 hours by volume percentage. Other steps and parameters are the same as those in Embodiment 1.

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PUM

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Abstract

A process for preparing foaming silicon nitride ceramics relates to a process for preparing silicon nitride ceramics, which resolves the problems in the prior art that the process for preparing foaming silicon nitride ceramics is complex, the cost is high, the material compression intensity is low, heat conductivity is high and large-scale controlling porosity is difficult. The preparing method is that mixing silicon nitride suspending liquid and gelling agent, still mixing the mixture and coal ash hollow micro-beads. Injection molding the obtained suspending binding liquid, sintering the billet which is frozen, demolded and dried with room temperature under protective atmosphere to obtain foaming silicon nitride ceramics. The invention uses coal ash hollow micro-beads as raw materials of pore-forming agent and combustion improver, thereby the cost is low, the process is simple, the coal ash hollow micro-beads can reduce the heat conductivity of the material, the heat resistance is good, the material compression intensity is strengthened and the large-scale controlling porosity is capable.

Description

technical field [0001] The invention relates to a preparation method of silicon nitride ceramics. Background technique [0002] Ceramic foam has high surface area, high wettability, low density, low heat capacity, low heat conduction and excellent high temperature performance. Compared with organic foam materials, ceramic foam materials have high strength, high hardness, high temperature resistance, and high environmental corrosion resistance; compared with metal foam materials, ceramic foam materials have low density and high oxidation resistance , Low thermal conductivity, low coefficient of thermal expansion and high temperature tolerance. [0003] Due to their special geometry and properties, ceramic foams are used in a wide range of applications, e.g. as thermal insulation for furnaces and aeronautics, filters for molten metals and hot gases, catalyst supports, biomaterials, gas burners or as lightweight materials. [0004] Foam ceramics can be made by foaming, but it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/08C04B35/584C04B35/645
Inventor 贾德昌邵颖峰
Owner HARBIN INST OF TECH