Alumina Porous Ceramic Disc Round And Ceramic Flange With Wear Resistance For Screw Connection Terminal Block

1. Application areas of Alumina porous ceramic:

(1).Molten metal filtration

The number, shape, size, type, impurities and gas of inclusions in metal have a significant impact on its strength, plasticity, and toughness. The use of porous ceramic filters to purify molten metal can effectively purify molten metal, improve the intrinsic quality and purity of the metal, and is simple and practical. In addition to mechanical and reactive filtration, the porous ceramic filter's mechanism for purifying molten metal is more important to "rectify" the molten metal, destroy the molten metal slag, and extend the slag floating time to achieve purification. Alumina ceramic filters are divided into granular, core, mesh, honeycomb and foam according to the structure.

(2). Car exhaust purification treatment

As automobile exhaust emission standards become higher and higher, the requirements for purifiers are also increasing: good thermal shock resistance, high strength, low thermal expansion coefficient, small pressure drop, long life, fast ignition, high catalytic conversion efficiency, etc. Alumina is used as a carrier for automobile exhaust purification catalysts, and it can be divided into two types: granular and overall. The particulate carrier is mainly spherical, and its material is activated alumina (other oxides such as ZrO₂ can be added). The monolithic carrier is mainly honeycomb, and its material is alumina ceramics. Activated alumina has a large specific surface area (200～300m2/g) and good mechanical strength. The particle size is within 2～6mm. It is simple to prepare, low in price, and easy to fill. In the early days, most of these carriers were used. However, due to the high density of the activated alumina carrier, the high heat capacity, poor warm-up performance, and stacked filling, it is easy to cause the engine exhaust resistance to increase, the back pressure is large, the fuel consumption increases, the power decreases, and it is easy to wear in the converter. Chalking, causing secondary pollution. It has been replaced by a monolithic honeycomb carrier.

(3).Microporous membrane

Alumina is particularly suitable for making ceramic separation membranes. Using different preparation processes, separation membranes with different pore sizes ranging from 4nm to 15μm can be prepared. Compared with polymer membranes, ceramic separation membranes are resistant to high temperatures, high in strength, and suitable for high-pressure systems; corrosion-resistant, for organic matter accumulated on the membrane surface or in the micropores, pickling or high-temperature burning loss treatment can be used. Ceramic separation membranes have broad application prospects in high temperature flue gas separation, separation of various oils and water, regeneration of various grinding oils, sewage treatment, recovery of useful substances in discharged liquids, and preparation of ultrapure water.

(4).Sensor

Alumina porous ceramics can be used as a humidity sensor. Its working principle is that water in the air is adsorbed on the porous surface, causing a change in the conductivity of the material, that is, the greater the air humidity, the thicker the water layer adsorbed by the porous ceramic , The greater the conductivity of the sensor, so the humidity of the surrounding environment can be inferred based on the conductivity of the material.

(5). Diaphragm material

Alumina porous ceramics can also be used as electrolytic separators and battery separators. This is made by using porous ceramics with large contact area with liquid and gas, and the cell voltage is much lower than that of general materials. The electrolysis diaphragm material made of porous ceramics can greatly reduce the voltage of the electrolysis cell, improve the electrolysis efficiency, and save electric energy and electrode materials. Its shape is mostly plate-like and tubular, and it has applications in chemical batteries, fuel cells and photochemical batteries. The battery separator made of porous ceramic can replace the organic components of various batteries, greatly extending the service life of the battery

2. Typical properties for common materials of Alumina Ceramic:

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