Characteristics of porous ceramics, what are the disadvantages of porous ceramics

Summary. 1.High porosity.

An important feature of porous ceramics is that they have a large number of uniform and controllable pores. There are open pores (pores in the ceramic carcass that communicate with the atmosphere. ) and closed pores (pores in the ceramic carcass that do not communicate with the atmosphere.

The open pores have the functions of filtration, absorption, adsorption, and elimination of echoes, while the closed pores are conducive to resistance.

2.High intensity. Porous ceramic materials are generally made of metal oxides, silicon dioxide, silicon carbide, etc. after high temperature calcination, these materials themselves have high strength, and the boundary part of the raw material particles melts and bonds during the calcination process, forming ceramics with high strength.

3.Stable in physical and chemical properties. Porous ceramic materials can resist acid and alkali corrosion, and can also withstand high temperature and high pressure, and their own clean state is good, which will not cause secondary pollution, and is a kind of green and environmentally friendly functional material.

4.High filtration precision and good regeneration performance. The porous ceramic material used as a filter material has a narrow pore size distribution range and high porosity and specific surface area, and the filtered material is in full contact with the ceramic material, and the suspended solids, colloids and microorganisms and other pollutants in it.

What are the disadvantages of porous ceramics.

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1.High porosity. An important feature of porous ceramics is that they have a large number of uniform and controllable pores.

There are open pores (pores in the ceramic carcass that communicate with the atmosphere. ) and closed pores (pores in the ceramic carcass that do not communicate with the atmosphere. The open pores have the functions of filtration, absorption, adsorption, and elimination of echoes, while the closed pores are conducive to resistance.

2.High intensity. Porous ceramic materials are generally made of lead crude metal oxides, silicon dioxide, silicon carbide, etc. calcined at high temperatures, and these materials themselves have high strength.

3.Stable in physical and chemical properties. Porous ceramic materials can resist acid and alkali corrosion, and can also withstand high temperature and high pressure, and their own clean state is good, which will not cause secondary pollution, and is a kind of green and environmentally friendly functional material.

4.High filtration precision and good regeneration performance. The porous ceramic material used as a filter material has a narrow pore size distribution range and a high porosity and specific surface area, and the filtered material is in full contact with the ceramic material, and the suspended solids, colloids and microorganisms and other pollutants in it are excited.

The first is high temperature resistance, which will not cause any cracks when burned at very high temperatures. This has led to a lot of increase in its use in many buildings.

The second is that it is still a product with environmental performance, and it has been widely used in many places.

The third is that because it has more holes, it also has the effect of sound insulation in the use of the house. It is one of the green and environmentally friendly building materials, which has been vigorously advocated by the state. Perforated bricks have a wide range of applications, and there are also shale bricks, clay bricks, and standard bricks that also have their own characteristics.

There are many reports that many countries are now using perforated bricks on a large scale, and its popularity has occupied a lot of corners.

The fourth is that it has a strong load-bearing capacity, and because it is very lightweight, it is convenient for use for too long. High strength, low cost, good heat and sound insulation, moisture and waterproof performance. In today's construction industry, it is slowly becoming a substitute for other brick products.

Under the vigorous promotion of use in many countries, it has become an irreplaceable product.

Porous ceramics, also known as microporous ceramics, foam ceramics, etc., have a uniform distribution.

The micropores, with small volume density, have the characteristics of three-dimensional network skeleton structure and interpenetration. Porous ceramics have a wide range of applications in many aspects, such as gas and liquid filtration, purification and separation, chemical catalytic carriers, advanced insulation materials, biological implant materials, sound absorption and shock absorption, and sensor materials.

The microstructure of ceramics mainly includes ceramic phase, glass phase and gas phase. If the porosity of the ceramic is high, it will affect the strength of the ceramic and reduce the strength, but there are also porous ceramics made of ceramic pores, and its main use is as a filter material, or a heat and sound insulation material. In fact, clay pots and flower pots that come into contact with daily life can also be regarded as the most primitive porous ceramics.

Porous ceramic material is based on corundum sand, silicon carbide, iolite and other high-quality raw materials as the main material, through molding and special high-temperature sintering process prepared a kind of porous ceramic material with open pore size, high opening porosity, with high temperature resistance, high pressure, acid, alkali and organic media corrosion, good biological inertness, controllable pore structure and high open porosity, long service life, good product regeneration performance and other advantages, can be applied to various media precision filtration and separation, high-pressure gas exhaust silence, gas distribution and electrolytic separators, etc.

According to the pore formation method and pore structure, porous ceramics can be divided into three categories: granular ceramics; Foam ceramics; Honeycomb ceramic. Organic microspheres can be added to create pores.

1) High siliceous silicate material, which is mainly made of hard porcelain slag, acid-resistant ceramic slag and other acid-resistant synthetic ceramic particles as aggregates, with water resistance, acid resistance, and a service temperature of 700 °C.

2) Aluminosilicate material, which uses refractory clay clinker, burnt clay, sillimanite and synthetic mullite particles as aggregates. It is resistant to acid and weak alkali, and can be used at a temperature of up to 1 000 °C.

3) Fine ceramic material, which is mixed and sintered with a variety of clay clinker particles and clay to obtain microporous ceramic material.

4) Diatomaceous earth material, which is mainly made of selected diatomaceous earth as raw material and sintered with clay. It is used for fine filtration of water and acidic media.

5) Pure carbonaceous material, which is made of low ash coal or petroleum asphalt coke particles as raw materials, or added part of graphite, bonded and fired with dilute tar, and used for water resistance, cold and hot strong acid, cold and hot strong alkali media, and air disinfection and filtration.

6) Corundum and emery materials, which use different types of fused corundum and silicon carbide particles as aggregates, which have the characteristics of strong acid resistance and high temperature resistance.

7) Iolite and aluminum titanate materials are characterized by a small coefficient of thermal expansion, so they are widely used in thermal shock environments.

Porous ceramic material is based on corundum sand, silicon carbide, iolite and other high-quality raw materials as the main material, through molding and special high-temperature sintering process prepared a kind of porous ceramic material with open pore size, high opening porosity, with high temperature resistance, high pressure, acid, alkali and organic media corrosion, good biological inertness, controllable pore structure and high open porosity, long service life, good product regeneration performance and other advantages, can be applied to various media precision filtration and separation, high-pressure gas exhaust silence, gas distribution and electrolytic separators, etc.