porousceramic: 2017

Tuesday, November 7, 2017

Porous Ceramic Filter Products

Porous Ceramic products are used in in filtration (solid particulate removal), diffusion (gas-gas, gas-liquid, and liquid-liquid mixing), liquid dispersion and Pneumatic conveying and other applications in a wide range of industries. Porous ceramics are more durable in severe environments and their surface characteristics permit them to satisfy very specific requirements.

Unlike other materials, technical ceramic possess the following characteristics:

Very good resistance corrosion and all etching solution. Depending on the composition, some ceramic may have low resistance to concentrated hydrofluoric acid.
Low coefficient of thermal expansion. It could withstand up to 500°C.
Uniform micro-porous distribution. It can be made to variety of porous size of up to 50μm according to the user’s requirement.
As it is chemically stable, it will not cause secondary pollution.

Depending on the contaminant, porous ceramic can be cleaned by a variety of methods making them an excellent value product. Like-new performance can often be restored by exposing the ceramic materials to high temperatures or corrosive cleaning treatments.

The sizes of the pores are be ranged between 10 micron to 100 micron.

Thursday, October 12, 2017

Porous Ceramic

Although the main compositions of the porous ceramics are alumina and fused silica, we can also manufacture other materials such as silicon carbide etc.

In most cases, the porosity of these ceramics can be varied from 20% to 60% by volume. The porous structures are always interconnected. Liquid and gas can flow through them with low pressure drop.
The pore size, depending on the manufacture technique used, can be controlled to as small as 10 nanometers with a narrow pore size distribution. However, the shape of the porous ceramic may be limited when pore sizes approaches the lower limit.
The porous ceramics are produced in any shapes according to customer's design. Typical shapes already manufactured include rods, tubes, and thin plates.
A sol-gel technique is used to produce porous ceramic media in forms of spheres, flakes and irregularly shaped particles. Such ceramics have enormous surface areas up to 500 m² per gram and are applied as high
performance catalyst carriers or supports for various chemical reactions.
The excellent inertness of ceramics offers an easy way of sterilization as compared with plastics and other materials.

Ceramics have following unique properties:

· Uniform pore sizes and high surface areas

· Excellent chemical resistance in both acid and alkaline conditions.

· Good wearing and erosion resistance.

· Withstands high temperature.

· Good rigidity and dimensional stability.

· Can be coated or immobilized with virtually any catalytic or other functional materials.

· High porosity and uniform pore size enable low resistance for both gas and liquid flow through applications.

New Product Developments:

1. Ceramic filter with various pore size ranges and low pressure drop.

2. Poreslides: Ceramic substrates with nano-pore surface structure, a unique platform for chemical and bio-chemical applications.

Typical Applications:

· Filters for gases and liquids

· Capillary Electrophoresis

· Filtration for heavy metal ions (Cr, Ni etc) in water

· High temperature chemical support for gas absorption

· High efficiency flow through catalytic supports

· Gas burners

· Chromatography

· Micro trapping systems and bio-catalytic supports

· Vacuum holding plates (vacuum chunk)

· Nano-membrane supports for sensor applications

· Micro-bubble diffusers

· Fine or micro channels for electrophoresis

· Chemical or bio reactor

· More......

Please contact us if our porous ceramics may be useful in you application

*This article is for information only and copyrights are exclusively owned by HP Technical Ceramics

Friday, September 22, 2017

Porous Ceramics

Porous Ceramics

Porous ceramic is a ceramic of which the material itself has numerous pores by the ceramic sintering technology and is used for a vacuum chuck.

Recently it is widely used as a basic material for various industrial products like filters, refractories, kiln furnitures, absorbers, acoustic absorbents, light weight structural materials, adiabatic materials, etc.

Especially it is applied for the vacuum absorption technology with high precision and high performance to absorb ultra thin objects which is required recently for production of semiconductor, LED and display.

It is very important for porous ceramic to have high porosity and maintain high strength. Especially in the area of semiconductor and display industry recently rising as an issue, porous ceramic should have even porosity and good surface roughness not to damage the object to absorb.

It is good for porous ceramic to have high porosity but the higher the porosity is, the lower the material strength gets. In addition, when pore density is low the porosity gets lower or the pore size gets bigger at the same porosity. So the material with low pore density also has lower strength.

All Alumina characteristics (including thermal properties, mechanical properties and physical and chemical properties, etc.) is related to its purity. In general, the higher purity of alumina, the better thermal conductivity. And density of high-purity alumina close to the theoretical density which can make the mechanical properties better.

Tuesday, September 19, 2017

POROUS CORDIERITE CERAMIC DISC

POROUS CORDIERITE CERAMIC DISC

HIGH PURITY POROUS CORDIERITE CERAMIC

Made from the high purity mineral Mg₂Al₄Si₅O₁₈ which is also 2MgO·2Al₂O₃·5SiO₂, a magnesium alumino-silicate.

This material is an extremely lightweight material with low thermal expansion and excellent strength, rigidity and thermal shock resistance; and has very good corrosion resistance to chemicals at high temperature, and high use temperature. It may be used for a variety of electrical, mechanical, and thermal applications

The specifications for these components are as follows:

Outside Diameter: Approximately 3.470” +/- 0.010" (90.4 mm)

Thickness: Approximately 0.100" +/- 0.005" (2.5 mm)

Specific Gravity or Density: 2.6 g/cm3

Water Absorption or Gas Permeability -- Porosity: ~50%

Fusion Temperature or Melting Temperature: 1450 °C or 2642 °F

Maximum Working Temperature: 1200 °C or 2200 °F

Thermal Conductivity: 0.3 W/m* K

Expansion Coefficient or CTE from RT-600°C: 3 x 10^-6 inches/°C

Electrical Resistivity at 20 C: 10¹⁴ Ohm*cm

Electrical resistance at 600 C: 10⁸Ohm*cm

Modulus of Elasticity: 14 x 10⁶ p.s.i. or 250 GPa.