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Refractory Cordierite slab 390*370*15mm for porcelain tableware
1. Introduction
Cordierite has excellent thermal shock resistance, good strength
and can be formed by pressing, extruding, casting and vibrating
into complex shapes. Cordierite mullite kiln furniture is widely
used in porcelain, heavy clay, glass panel, powder metallurgy,
magnetic materials, green energy, food, glass, abrasives, iron and
steel, mining and aerospace engineering.
Besides its use as kiln furniture, it is also extensively used in
kiln structures and kiln car system, where it is combined with
ceramic fiber to achieve the aims of improving fuel efficiency and
avoiding contamination.
The ideal chemistry to produce the crystals is 13.8% MgO, 34.8% Al2O3 and 51.4% SiO2 (2MgO, 2Al2O3, 5SiO2). Talc, kaolin and raw alumina powder can be blended to produce
this chemistry (other materials are also used e.g. aluminum
hydroxide, steatite and other MgO minerals). Compound materials
(like kaolin and talc) react better than pure oxide materials (like
MgO, Al2O3, SiO2). Materials of finer particle size react better.
A simple firing to 1300C (about cone 11 and within the reach of
many ordinary kilns) and soaked may produce some crystal
development. However firing (actually sintering) at 1400C+ with
significant soaking time is needed for the best results. Thermal
expansion measuring equipment is needed to determine if your firing
is actually developing the crystal matrix or not.
2. Technical Parameter
Item and Descriptions | Specifications Offered | ||
Al2O3 (%) | 40~48 | ||
SiO2 (%) | 45~48 | ||
MgO (%) | 5~8 | ||
MOR(MPa) | 20℃ | 14 | |
1250℃ | 12 | ||
Bulk Density(g/cm3) | 2.0 | ||
Open Porosity(%) | 28 | ||
Phase composition(%) | Mullite | 55 | |
Cordierite | 30 | ||
Max. Service temperature ℃ | 1280 |
3. Application
Cordierite slab is widely used to sinter pottery , ceramic insulator and so on.Using temperature can not be over 1300 ℃
We can also supply SiSic beam.