80 tons Fire clay brick and Insulation Ceramic fiber blanket and Refractory cement and Wet type bonding motart are packed for delivering to customer in Philippines.
Refractory clay brick is a mixture of a number of water-containing silicate deposits, and the main chemical composition is Al2O3 and SiO2. Al2O3 not only comes from refractory clay brick mineral deposits, but also comes from fine-grained quartz. The closer its Al2O3 content and Al2O3/SiO2 ratio are to the theoretical value of kaolinite deposits (Al2O339.5%, Al2O3/SiO2=0.85), the higher the purity; the more kaolinite content, the better the quality. The larger the Al2O3/SiO2 ratio, the higher the refractoriness and the wider the sintering melting scale. The main impurities in clay refractory bricks are alkali metals, alkaline earth metals, iron, titanium and other compounds, as well as some organic substances. All kinds of compounds have a fluxing effect, which will reduce the refractoriness of raw materials. Therefore, the lower the content of impurities, especially Na2O and K2O, the higher the refractoriness.
The weak points of clay refractory bricks that are easily damaged during use:
The damage during use is firstly slag corrosion, but also the factors of fracture and peeling. Because clay refractory bricks undergo high temperature, rapid temperature changes, atmospheric changes, and erosion by dust, smoke, metal solution and slag during use, the damage mechanism during use is also quite complicated.
1. Continuous corrosion; melting and gasification on the surface; diffusion in the molten phase and gas phase; interface reaction of the molten phase, gas phase and bricks
2. Melting and gasification from the inside of the clay brick; the infiltration of molten material and gaseous components; the melting and gasification components are discharged to the outside.
3. Discontinuous erosion. Cracks occur; low-density phases are generated by the reaction with the infiltrate; phase transfer accompanied by volume changes; local shrinkage and thermal stress concentration caused by reheating; local concentration of bubbles; mechanical stress and thermal stress concentration on the structure; Anisotropy of thermal stress and elastic modulus of constituent phases; precipitation and deposition caused by reaction with gas phase; mechanical shock
4. Mechanical impact: Local presence or formation of high solubility, high vapor pressure or low viscosity phases; loss caused by abrasion; damage modes of clay refractory bricks during use can be summarized into three basic forms.
(1) Due to the mechanical stress and thermal stress of the structure, the refractory working lining produces irregular cracks (thermal, mechanical peeling or chipping) and damage.
(2) Due to the infiltration of slag and temperature fluctuations on the hot surface, the structure of the refractory brick changes, so a unique metamorphic layer is formed, and cracks parallel to the heating surface are generated at the interface between the original layer and the metamorphic layer and are damaged.
(3) Melt flow and wear due to reaction with metal solution, slag and smoke, mainly due to the generation of liquid phase, which causes the working surface layer to ablate.
Because of the reason of the clay brick itself: it can be made from local materials and the price is quite cheap, but the application of bricks is indeed quite extensive, so the above-mentioned cracks, damage and other phenomena should be paid more attention to in normal applications to avoid occurrence The emergence of such defective products ensures that we can use clay refractory bricks safely and securely.
