[China Aluminum Network] With the development of the aluminum industry, aluminum alloy melting furnace and refractory furnace refractory materials are also developed from phosphate bonded high alumina bricks to low cement castables. To prevent the penetration of liquid aluminum into the refractory material, a de-wetting agent is often used to increase the wetting angle between the liquid aluminum and the refractory material and at the same time prolong the service life of the refractory material at high temperatures.
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For the refractories heating surfaces of aluminum and aluminum alloy melting furnaces and holding furnaces, low-cement castables have replaced phosphate-bonded high-alumina bricks. The reasons are as follows: In the structure of low cement castables, there is a small pore size, liquid aluminum and aluminum alloys are difficult to penetrate into the refractory material, so that oxides in the refractory material can be avoided by the aluminum, and low cement castables Excellent wear resistance. In recent years, low cement castables have improved wetting angles due to the use of liquid aluminum as an additive, so their properties have been improved. This new material is gradually replacing traditional phosphate bonded bricks and low cement castables.
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