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Manufacturing method of gradient porous silicon carbide ceramic tube

A silicon carbide ceramic, gradient porous technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of limited product shape and size, complex preparation process, high sintering temperature, and easy to manufacture large pipe fittings, process Simple, low preparation temperature effect

Active Publication Date: 2016-10-26
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Abstract
  • Description
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Problems solved by technology

[0008] In order to solve the technical problems in the prior art of gradient porous SiC ceramics, such as complicated preparation process, high sintering temperature, limited product shape and size, and low strength, the purpose of the present invention is to propose a gradient porous SiC ceramic tube. The preparation method uses the CVI method to adjust the pores of sintered porous silicon carbide ceramics to obtain a gradient structure

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  • Manufacturing method of gradient porous silicon carbide ceramic tube
  • Manufacturing method of gradient porous silicon carbide ceramic tube
  • Manufacturing method of gradient porous silicon carbide ceramic tube

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Embodiment 1

[0024] A method for preparing a gradient porous silicon carbide ceramic tube. The preparation method uses a sintered porous SiC ceramic tube with a single-layer pore structure with a porosity of 20% and a pore diameter of 50 μm as the base material, and the sintering of the single-layer pore structure type porous SiC ceramic tubes such as figure 1 As shown, graphite paper is coated on the inside; the coated base material is placed in a CVI furnace for vapor phase growth to prepare a gradient porous SiC ceramic material; on the outside of the base material, SiC ceramic pellets grown by CVI technology are used to control The pore structure of the base material; the growth process is: using MTS as a precursor, hydrogen as a carrier gas and dilution gas, and argon as a protective gas; MTS:H 2 :Ar ratio is 1:15:10, the total gas pressure is 0.5kPa, the deposition temperature is 800°C, and the deposition time is 100h; the specific surface area of ​​the prepared gradient porous silic...

Embodiment 2

[0026] A method for preparing a gradient porous silicon carbide ceramic tube. The preparation method uses a sintered porous SiC ceramic tube with a single-layer pore structure with a porosity of 40% and a pore diameter of 100 μm as the base material, and graphite paper on the outside Coating: Put the coated base material into a CVI furnace for vapor phase growth to prepare a gradient porous SiC ceramic material. The inner side of the base material is as follows: MTS is used as the precursor, hydrogen is used as the carrier gas and dilution gas, and argon is used as the protective gas. MTS:H 2 :Ar ratio is 1:10:5, the total gas pressure is 3kPa, the deposition temperature is 1200°C, and the deposition time is 10h; the fracture morphology photo of the gradient porous SiC tube is as follows figure 2 As shown, its specific surface area is 12m 2 / g, the strength is 37MPa, and the fracture toughness is 0.36MPa m 1 / 2 , the pressure drop is 45hPa.

Embodiment 3

[0028]A method for preparing a gradient porous silicon carbide ceramic tube, the preparation method uses a sintered porous SiC ceramic tube with a porosity of 20% and a double-layer pore structure as a base material, the outer layer has a pore diameter of 20 μm, and the inner layer has a pore size of 100μm; coated with graphite paper on the inside; put the coated substrate material into the CVI furnace for vapor phase growth to prepare gradient porous SiC ceramic material; on the outside of the substrate material, use SiC whiskers grown by CVI technology to control the substrate The pore structure of the material; the growth process is: using MTS as a precursor, hydrogen as a carrier gas and dilution gas, and argon as a protective gas; MTS:H 2 The ratio of :Ar is 1:20:15, the total gas pressure is 0.5kPa, the deposition temperature is 1000°C, and the deposition time is 1h; the catalyst used is FeCl 3 ; The specific surface area of ​​the gradient porous SiC tube is 40m 2 / g, t...

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Abstract

The invention belongs to the field of manufacturing porous silicon carbide ceramic and provides a manufacturing method of a gradient porous silicon carbide ceramic tube. The manufacturing method includes: using a sintered porous SiC ceramic tube as a base material, and coating the inner side or the outer side of the sintered porous SiC ceramic tube with graphite paper; placing the sintered porous SiC ceramic tube in a chemical gas-phase permeation furnace for gas-phase growing; adopting MTS as a precursor in the chemical gas-phase permeation furnace, enabling MTS to be in chemical gas-phase permeation reaction in a gas phase of the chemical gas-phase permeation furnace to generate a SiC phase, and enabling the SiC phase to gradually permeate into the sintered porous SiC ceramic tube from one side without being coated with the graphite paper to form the gradient porous silicon carbide ceramic tube with porosity and pore size gradiently decreasing from one side without being coated with the graphite paper to one side coated with the graphite paper. The gradient porous silicon carbide ceramic tube has the advantages of low preparation temperature, simple preparation process and easiness in manufacturing large pipe fittings.

Description

technical field [0001] The invention belongs to the field of preparation of porous silicon carbide ceramics, in particular to a preparation method of gradient porous silicon carbide ceramic tubes. Background technique [0002] Porous ceramic material is a new type of functional ceramic with a large number of pores in its internal structure. It has the characteristics of low density, high strength, high porosity, corrosion resistance, oxidation resistance, good heat insulation, thermal shock resistance and high temperature resistance. , Therefore, porous ceramics have been widely used in general industrial fields and high-tech fields. [0003] In recent years, with the rapid development of my country's heavy industry and a large number of automobiles, the problem of environmental pollution has become increasingly serious. The most obvious is the frequent occurrence of haze weather. In the process of solving the haze weather, high-temperature dust removal with excellent perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85C04B38/00
CPCC04B38/007C04B41/4529C04B41/5001C04B41/85C04B2235/96
Inventor 李红霞刘永胜王刚袁波于建宾马渭奎
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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