Quais são as diferenças entre os diferentes tipos de tijolos de revestimento de alumina?

O tijolo de revestimento de alumina é um material refratário comum, feito principalmente de alumina de alta pureza como principal matéria-prima, com a quantidade apropriada de outros aditivos adicionados, e formado, seco, and sintered at high temperatures. According to different alumina content and physical properties, tijolos de alta alumina can be divided into different grades. High alumina bricks include first-grade high alumina bricks, second-grade high alumina bricks, and third-grade high alumina bricks. What is the difference between them?

Differences between different grades of alumina lining brick

Different alumina content

The alumina content of the first-grade high alumina brick is greater than 75%, the alumina content of the second-grade high alumina brick is between 60%-75%, and the alumina content of the third-grade high alumina brick is between 48%-60%.

Different compressive strength

Due to the different alumina contents, the first-grade high alumina bricks are relatively hard and have a greater compressive strength, which can reach 100-150MPa; the second-grade high alumina bricks have a lower compressive strength, which is about 80-100MPa; the third-grade high alumina bricks have the lowest compressive strength, which is generally below 70MPa.

Different refractoriness

Due to different alumina contents, the first-grade alumina lining brick has the highest refractoriness, which can reach above 1790℃; the second-grade alumina lining brick has the second highest refractoriness, which can reach above 1750℃; the third-grade aluminum oxide bricks have the lowest refractoriness, which is generally below 1700℃.

Different uses

Due to the differences in alumina content and physical properties, different grades of high-alumina bricks are also different in use. Grade one high-alumina bricks are mainly used in high-temperature industrial equipment such as high-temperature furnace linings, electrolytic cells, desulfurization equipment, etc.; Grade two high-alumina bricks are widely used in various crucibles, fornos de vidro, cement kilns and other fields; Grade three high-alumina bricks are mainly used in industrial equipment with lower temperatures.