Properties of clay

x8r5bbcg10bDry clay absorbs water, but when wet, it becomes waterproof. After pereminaniya and mixing it acquires the property take various forms and save them after drying. This property is called plasticity. Besides binding ability the clay has: a powdered solids (sand) gives homogeneous “dough” also possessing ductility, but to a lesser degree. Obviously, the more impurities in the clay sand or water, the lower the ductility of the mixture.

By the nature of the clay are divided into “fat” and “skinny.”
Clay with high plasticity called “fatty” as a presoaked condition gives tactile feel oily substance. “Fatty” clay brilliant and slippery to the touch (if this clay to take on the teeth, it slips), contains few impurities. Dough. “Cooked out of it, gentle Brick of a clay during drying and firing gives a crack, and in order to avoid this to batch add so-called” emaciated “material: sand,” lean “clay (see below.), Burnt brick, pottery fight, sawdust, and so on.
Clay maloplastichnyh or firm referred to as “lean.” At the touch they are rough, matte finish, friction and finger easily crumble, separating earthy specks. “Lean” clay contain many impurities (crunch on the teeth), when cut with a knife do not allow chips. Brick of the “lean” clay is fragile and crumbly.
An important property is its ratio of clay to calcination and in general to an elevated temperature if soaked clay hardens in air, and easily wiped dry powder in, while not having undergone no internal changes that occur during high temperature processes and chemical composition of the material changes.

Кембрийская голубая глина.At very high temperatures the clay melts. oplavlivaniya temperature (beginning of melting) describes refractory clay, which is not the same for its different varieties. Rare varieties of clay required for firing the enormous heat -up to 2000 ° C, it is difficult to even get in the factory. In this case, it becomes necessary to reduce the fire resistance. Oplavlivaniya can reduce the temperature due to the introduction of additives the following substances (1% by weight): magnesium, iron oxide and lime. Such additives are called fluxes (fluxes).
Coating clays varied: light gray, bluish, yellow, white, reddish brown with different shades. Quality bricks manufactured independent of the color of clay.
Dry clay absorbs water, but when wet, it becomes waterproof. After pereminaniya and mixing it acquires the property take various forms and save them after drying. This property is called plasticity. Besides binding ability the clay has: a powdered solids (sand) gives homogeneous “dough” also possessing ductility, but to a lesser degree. Obviously, the more impurities in the clay sand or water, the lower the ductility of the mixture.
By the nature of the clay are divided into “fat” and “skinny.”
Clay with high plasticity called “fatty” as a presoaked condition gives tactile feel oily substance. “Fatty” clay brilliant and slippery to the touch (if this clay to take on the teeth, it slips), contains few impurities. Dough. “Cooked out of it, gentle Brick of a clay during drying and firing gives a crack, and in order to avoid this to batch add so-called” emaciated “material: sand,” lean “clay (see below.), Burnt brick, pottery fight, sawdust, and so on.
Clay maloplastichnyh or firm referred to as “lean.” At the touch they are rough, matte finish, friction and finger easily crumble, separating earthy specks. “Lean” clay contain many impurities (crunch on the teeth), when cut with a knife do not allow chips. Brick of “lean” and unstable clay rassypchat.14
An important property is its ratio of clay to calcination and in general to an elevated temperature if soaked clay hardens in air, and easily wiped dry powder in, while not having undergone no internal changes that occur during high temperature processes and chemical composition of the material changes.
At very high temperatures the clay melts. oplavlivaniya temperature (beginning of melting) describes refractory clay, which is not the same for its different varieties. Rare varieties of clay required for firing the enormous heat -up to 2000 ° C, it is difficult to even get in the factory. In this case, it becomes necessary to reduce the fire resistance. Oplavlivaniya can reduce the temperature due to the introduction of additives the following substances (1% by weight): magnesium, iron oxide and lime. Such additives are called fluxes (fluxes).
Coating clays varied: light gray, bluish, yellow, white, reddish brown with different shades. Quality bricks manufactured independent of the color of clay.

 

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