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Clay brick
by Tiantian Xiaotiantian building materials High Alumina Brick is refers to the Al2O3 content is 30% ~ 40% aluminum silicate clay products.Clay brick is made of 50% 50% of soft clay and hard clay cooked material, size requirements according to certain ingredients, after forming, drying, burning under the high temperature of 1300 ~ 1400 ℃.Is the main mineral composition of clay brick kaolinite (2 sio2, Al2O3 · 2 h2o) and 6% ~ 7% of impurities (potassium, sodium, calcium, titanium, iron oxide).Clay brick firing process, the main is kaolinite constant water decomposition generated mullite (3 2 sio2, al2o3) crystallization process.Clay brick of SiO2 and Al2O3 in firing low eutectic melting point and impurities in the process of silicate, surrounded around the mullite crystal.High Alumina Brick belongs to the weak acid refractory products, can resist acid slag and the erosion of acid gases, the alkali resistance ability is a bit poor.Clay brick of thermal performance is good, resistance to thermal shock.
Clay brick of silica and refractoriness, up to 1690 ~ 1730 ℃, but the refractoriness under load is above 200 ℃ lower than the silica brick.Because in the clay brick in addition to containing high refractoriness of mullite crystal, also contain nearly half of the low melting point of amorphous glass phase.
In 0 ~ 1000 ℃ temperature range, uniform as the temperature rises, the clay brick volume expansion and linear expansion curve approximation in a straight line, the linear expansion rate was 0.6% ~ 0.7%, and only half of the silica brick.When the temperature of 1200 ℃ and then continue to heat up, the volume will be a maximum inflation began to shrink.Clay brick of residual shrinkage leads to masonry mortar joint crack, this is a big drawback of clay bricks.When the temperature exceeds 1200 ℃, clay brick gradually melting, low melting point from each other due to particles by surface tension, a much closer to produce volume contraction.
As a result of the clay brick lower refractoriness under load, causing shrinkage at high temperature, heat conduction performance is smaller than silica brick 15% ~ 20%, and mechanical strength than silica brick is poor, so, clay brick can only be used for secondary parts of coke oven, such as regenerator seal wall, small flue lining brick and regenerator checker brick lining brick, roof, door and rising pipe lining brick, etc.
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About Tiantian Xiaotiantian 
building materials
71 connections, 0 recommendations, 200 honor points.Joined APSense since, January 12th, 2015, From beijing, China.
Created on Dec 31st 1969 18:00. Viewed 0 times.
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