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refractories

Clay Refractory Mortar

Clay refractory mortar is made from calcined clay (clinker), waste clay brick powder and combined clay (raw material). Clinker is major component of clay refractory mortar with content of about 75%~80%. Raw clay is a binder which its function is enhancing plasticity of the mortar and reduce breathability and water loss rate. However, the batching amount of raw clay cannot be too large, otherwise it will be easily cracked. The proper batching amount should be 20%~25%.

Clay Refractory Mortar

Physical and Chemical Indicators

Clay Refractory Mortar
ItemIndex
NN-30NN-38NN-42NN-45ANN-45B
Refractoriness (℃)≥16301690171017301730
Al2O3 (%) ≥3038424545
Cold flexural bond strength MPa110℃ after drying11112
1200℃×3h
after sintering
33336
0.2MPa  RUL,℃ T2.0 ≥1200
Linear change rate %1200℃×3hafter  sintering+1 ~-3
1300℃×3hafter  sintering+1 ~-5
Bonding time1~3
Particle size %-1.0 mm100
+0.5mm ≤2
-0.074mm ≥50
Advantages

Clay refractory mortar is mainly used in furnace body joint and repair of different kinds of furnace with clay brick masonry, such as blast furnace, hot air furnace, coke oven, soaking furnace, heat exchanger and boiler.

Characteristics

Clay refractory mortar, as joint material, is able to adjust size deviation of bricks to make masonry structure regular with uniform load, and strengthen the masonry as a compact whole, so as to resist damages of external forces and avoid invasion of gas and molten liquid.

  • Good plasticity and construction convenience.
  • Sufficient bond strength to combine the masonry as a solid whole at working temperature;
  • Low thermal conductivity.
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