Silicon nitride/silicon carbide complex phase porous ceramic and preparation method thereof

A technology of porous ceramics and nitriding rate, applied in the field of porous ceramics, can solve the problems of uneven void structure, poor net size forming, poor directional interconnection, etc., and achieve low shrinkage, high bending strength, and good corrosion resistance Effect

Active Publication Date: 2014-11-19
江西中科上宇科技有限公司
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  • Abstract
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Problems solved by technology

[0005] The present invention aims at Si in the prior art 3 N 4 /SiC composite porous ceramics have technical problems such as uneven void structure, poor directional interconnectivity, poor net size forming, and low bending strength. The purpose is to provid...

Method used

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  • Silicon nitride/silicon carbide complex phase porous ceramic and preparation method thereof
  • Silicon nitride/silicon carbide complex phase porous ceramic and preparation method thereof
  • Silicon nitride/silicon carbide complex phase porous ceramic and preparation method thereof

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Embodiment Construction

[0029] Comparative Examples 1-3 and Examples 1-12

[0030] Weigh 70.588g of 1.3 micron Si powder and 29.412g of 0.5 micron SiC powder as raw materials, then weigh ZrO 2 with 8g Y 2 o 3 Sintering aid, using absolute ethanol as a dispersant, the total raw material powder (the sum of Si powder, SiC powder and sintering aid): the weight ratio of absolute ethanol: SiC ball is 1:1:2, after mixing After 24 hours of mechanical wet ball milling, it was mixed evenly to prepare a slurry. The obtained slurry was put into a constant temperature drying oven and dried at 60°C for 24 hours, then sieved through a 100-mesh sieve, and dry-pressed under a pressure of 10 MPa, and finally subjected to 200 MPa cold isostatic pressing to form a green body. Put the green body obtained by cold isostatic pressing into a vacuum hot-press sintering furnace for rapid nitriding reaction sintering, firstly raise the temperature to 1100°C at a rate of 15°C / min, and then slowly increase the temperature to T...

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Abstract

The invention discloses a Si3N4/SiC complex phase porous ceramic of which the nitriding ratio is higher than 85% and the porosity is 30-60%. The preparation method comprises the following steps: (1) by using Si and SiC as raw materials, adding a sintering assistant, and uniformly mixing by ball milling to obtain a slurry; (2) drying the slurry, screening, carrying out dry pressing, and carrying out cold isostatic pressing treatment to form a biscuit; and (3) putting the biscuit in a sintering furnace, heating to 900-1200 DEG C and then to 1300-1500 DEG C in a high-purity nitrogen atmosphere, sintering by nitriding reaction, cooling, and finally carrying out furnace cooling. The sintering method has the characteristics of short sintering time, simple technique, low energy consumption and the like, can easily obtain the Si3N4/SiC complex phase porous ceramic material with net size molding, complicated shape, high porosity, controllable gap and oriented and interconnected gap structure, and is simple for molding; and the maximum bending strength can reach 150 MPa.

Description

technical field [0001] The invention belongs to the technical field of porous ceramics, in particular to a Si 3 N 4 Composite porous ceramic with SiC and its preparation method. Background technique [0002] Silicon nitride and silicon carbide (Si 3 N 4 With SiC, Si 3 N 4 / SiC) composite porous ceramics have shown broad applications in the fields of high-temperature gas filtration, sensors, catalyst supports, separation membranes, and thermal insulation materials due to their advantages of high strength, high toughness, wear resistance, corrosion resistance, and good chemical stability. Application prospect. [0003] He Xinbo et al. (Chinese patent ZL101913878) used SiC powder, Si 3 N 4 The powder and sintering aids are mixed with paraffin-based multi-component binder to form a uniform feed. After the preform obtained by injection molding is melted, thermally desorbed, and pre-sintered at 1150-1200 ° C, it is placed in a vacuum carbon tube. The furnace is sintered a...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/565C04B35/584C04B35/63
Inventor 胡海龙曾宇平左开慧夏咏锋姚东旭孙庆波
Owner 江西中科上宇科技有限公司
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