Silicon carbide high-temperature ceramic filter pipe and preparation method thereof

A high-temperature ceramic and silicon carbide technology, which is applied in chemical instruments and methods, filtration separation, separation methods, etc., can solve the problems of limited size and size of porous ceramic products, high energy consumption in the firing process, and poor product uniformity, and achieve thermal stability. Good properties such as permeability and air permeability, high production efficiency, and the effect of reducing the firing time

Active Publication Date: 2012-07-25
ZHONGCAI HIGH NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the molding process and molding equipment, the specifications and sizes of the porous ceramic products produced by the above molding methods are greatly restricted, and only products with smaller specifications can be produced, and semi-mechanized operations, low production efficiency, poor product uniformity, regularity Poor; the firing process consumes a lot of energy and produces a lot of harmful gases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The high-temperature silicon carbide ceramic filter tube according to the present invention, its batching weight percentage is composed of: particle diameter is 80-100 micron silicon carbide 72%, high-temperature binder 28%; Additional pore-enhancing agent: charcoal 12%, phenolic resin 2% .

[0031] Among them, the high-temperature binder is composed of 20% talc, 32% refractory clay, 40% potassium feldspar, and 8% alumina, which are mixed for later use.

[0032] Preparation method: mix the aggregate, high-temperature binder, and pore-enhancing agent evenly, age for 24 hours, and pass through a 16-mesh sieve for molding. Put the stale ingredients into the mould, put them into the isostatic press and press to form, the molding pressure is 125MPa, take out the mold after the molding is completed, and get the biscuit after the product is demoulded, and the semi-finished product is obtained after the biscuit is naturally dried. Put the semi-finished product into the kiln ca...

Embodiment 2

[0035] The high-temperature silicon carbide ceramic filter tube of the present invention, its batching weight percentage is composed of: particle diameter is 100-150 micron silicon carbide 75%, high-temperature binder 25%; Additional pore-enhancing agent: charcoal 10%, phenolic resin 1.5% .

[0036] Among them, the high-temperature binder is composed of 23% talc, 35% refractory clay, 30% potassium feldspar, and 12% alumina, which are mixed for later use.

[0037] The production method is that the molding pressure is 100 MPa, the firing temperature is 1330° C., and the holding time is 3 hours. Others are the same as in Example 1, and the obtained product is a silicon carbide ceramic filter tube of φ60×2020 mm.

[0038] Product performance: porosity: 42.2%, average pore diameter: 79 microns, compressive strength: 64.5MPa, thermal shock resistance: 1000°C-20°C cold air 10 times without cracking.

Embodiment 3

[0040] The high-temperature silicon carbide ceramic filter tube according to the present invention, its batching weight percentage is composed of: particle diameter is 200-300 micron silicon carbide 78%, high-temperature binder 22%; Additional pore-enhancing agent: charcoal 8%, phenolic resin 1% .

[0041] Among them, the high-temperature binder ingredients are composed of 22% talc, 32% refractory clay, 35% potassium feldspar, and 11% alumina, which are mixed for later use;

[0042] Preparation method: The molding pressure is 75MPa, the firing temperature is 1370°C, the holding time is 2.2 hours, and the others are the same as in Example 1. The obtained product is a φ60×2000mm silicon carbide ceramic filter tube.

[0043] Product performance: porosity: 48.9%, average pore diameter: 85 microns, thermal shock resistance: 12 times of cold air at 1000°C-20°C without cracking.

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Abstract

The invention relates to a silicon carbide high-temperature ceramic filter pipe and a preparation method thereof, the silicon carbide high-temperature ceramic filter pipe is used for filtering and dedusting of high-temperature gas, the length of the silicon carbide high-temperature ceramic filter pipe is 1500-3000mm, the average pore diameter is 40-120 mu m, the porosity is 30-60%, the compressive strength is 50-80MPa, and the silicon carbide high-temperature ceramic filter pipe further has the thermal shock resistance of 1000 DEG C-20 DEG C, no cracking when being impacted by cold air for 10times, large product size, uniform density, high strength, good thermal stability and good air permeability. The preparation method sequentially comprises the steps of preparing materials, molding and firing, and is characterized in that the molding adopts the isostatic pressing molding, the molding pressure is controlled to be 40-150 Mpa, the firing temperature is controlled to be 1250-1450 DEG C, the thermal insulation time is 2-3h, and the preparation method is scientific, reasonable, simple and easy to operate, and can ensure the product performances.

Description

technical field [0001] The invention relates to a silicon carbide high-temperature ceramic filter tube and a preparation method thereof. The silicon carbide high-temperature ceramic filter tube is used for filtering and dust removal of high-temperature gas. Background technique [0002] In recent years, with the development of clean coal technology and new energy materials and the implementation of national energy conservation and emission reduction policies, the requirements for particle (smoke, dust) purification technology in the field of high temperature and high pressure gas are getting higher and higher. Ceramic high-temperature and high-pressure filtration technology is the most important technology for purification of hot gas particles in the field of high-temperature and high-pressure gas developed internationally in the past two decades, and it is also a key technology for the international development and implementation of clean coal plans in the 21st century. Bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/20B01D46/24
Inventor 陈学江薛友祥李拯李小勇赵世凯巩玉贤焦光磊梁之会白守金李宪景
Owner ZHONGCAI HIGH NEW MATERIAL
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