High heat refractory kiln furniture Mullite lightweight insulation
brick 230 * 114 * 65mm
1. Description
Mullite (3 2 sio2, al2o3) phase of high aluminum refractory
material. General alumina content is between 65% ~ 75%. Mineral
composition in addition to the mullite, contain the alumina lower
also contains a small amount of glass phase and cristobalite;
Containing alumina high contains a small amount of corundum.High
refractoriness, can reach more than 1790 ℃. The rul start
temperature of 1600 ~ 1700 ℃. Room temperature compressive strength
of 70 ~ 260 mpa. Good thermal shock resistance. A sintered mullite
bricks and two fused mullite brick.
Sintered mullite brick with high bauxite clinker as the main raw
material, add a small amount of clay or raw bauxite as binder,
forming, sintering and made. Fused mullite brick with high alumina,
alumina industry and refractory clay as raw material, adding
charcoal or coke fine as a reducing agent, reduction fused method
is used to manufacture after forming.
2. Specification
| Item | 1300 | 1450 | 1550 | 1650 | 0.5 |
| ASTM C155-84 Classification | 23 | 26 | 28 | 30 | |
| ISO 2245 Classification | 125-0.5-L | 140-0.8-L | 150-0.9-L | 160-1.0-L | |
| Classification Temperature | 1260 | 1430 | 1540 | 1650 | |
g/cm³ Bulk Density ASTM C-134-84 | 0.6 | 0.8 | 0.9 | 1.0 | 0.55 |
Cold Crushing Strength ASTM C-93-847(MPa)
| 1.5 | 3.0 | 3.5 | 4.0 | 1.2 |
| Thermal Expansion At 1100℃ | 0.5 | 0.5 | 0.58 | 0.6 | ≤1.5(900℃) |
| Thermal shock Resistance Cycles | 30 | 30 | 30 | 30 | |
| Thermal Conductivity ASTM C182-88W/m.k | 400 | 0.14 | 0.27 | 0.32 | 0.41 | ≤0.15 |
| 600 | 0.16 | 0.29 | 0.34 | 0.43 | |
| 800 | 0.18 | 0.31 | 0.36 | 0.44 | |
| 1000 | 0.20 | 0.33 | 0.38 | 0.45 | |
| 1200 | — | 0.35 | 0.41 | 0.47 | |
| Al2O3 % | 37 | 52 | 67 | 73 | |
| Fe2O3 % | 1.3 | 1.0 | 0.8 | 0.6 | |
3. Features
Low Thermal Conductivity
It has good insulation effect and can thin the thickness of furnace
wall.
Low thermal capacity
Less heat storage, it has good usage effect in intermittent
furnace.
Good thermal shock resistance and high temperature strength
It can prolong the service life of kilns and prevent dirty slag to
drop down.
Precise dimension
It can keep uniform gaps between each brick, speed up the building,
guarantee the integrated high strength of the masonry.
Low impurity
Lower iron and alkali content, it has high resistance to reduce
atmosphere corrosion at high temperature.
4. Application
It is mainly used for hot blast stove top, blast furnace and
furnace bottom, the regenerator of glass furnace, ceramic sintering
kiln, petroleum cracking system corner lining, etc. Also widely
used in hot blast stove, metal furnace, ceramic tunnel
kilnelectrical porcelain shuttle kiln, etc., has a broad market
prospect.
