High alumina bricks and high alumina castables are both commonly used refractory materials and can be used in the construction of high-temperature industrial kilns. The common feature of both of them is that they contain a large amount of Al2O3 in their composition, and both of them can resist high-temperature erosion. But the difference between the two is still very big. So what are the differences between high alumina bricks and high alumina castables? As an experienced refractory material manufacturer, Rongsheng Refractory Materials Manufacturer has accumulated rich experience in high alumina bricks and high alumina castables.
The Difference between High Alumina Bricks and High Alumina Castables
- Different forms
High alumina bricks are shaped refractory materials. It has a fixed shape and size. The general standard refractory brick size is 230*114*65mm. High aluminum castables are unshaped refractory materials. It has no fixed shape, generally exists in powder form, and is usually stored in bags.
- Different production methods
The main production method of high alumina bricks is to form the well-proportioned raw materials through high pressure and then sinter them at high temperatures to form a fixed shape. The production method of high-aluminum castables eliminates the need for high-temperature sintering and high-pressure molding. It is directly bagged after the raw materials are proportioned.
- Different construction methods
High alumina bricks can be used directly during construction, and usually need to be used with high-temperature cement during use. High-aluminum castables need to be stirred by adding water, then poured into a fixed mold, and then air-dried and shaped. After finalization, the entire kiln needs to be baked before it can be put into use.
The difference between high alumina bricks and high alumina castables. Among them, the biggest difference between the two is still in the form, one is in a fixed shape and the other is in powder form. Although both can be used as masonry for kilns, for some occasions with special shapes and difficult construction, the construction difficulty of castables is obviously lower than that of high alumina bricks.
How to Choose High Aluminum Castables?
We all know that high-aluminum castable is a refractory castable with relatively high alumina content. It is widely used in the construction of high-temperature kilns. It has the characteristics of superior fire resistance, high-temperature resistance, corrosion resistance, and oxidation resistance. Therefore, the range and frequency of use are very high. But it is very important for us to choose good high-aluminum castables when purchasing. Its quality determines the service life of the high-temperature kiln and the quality of the materials smelted during use.
First of all, we need to know that high-aluminum castables are composed of aluminates, silicates, oxides, etc. In order to ensure the effect in a high-temperature environment, we must strictly follow the requirements when proportioning raw materials. Incorrect raw material ratio will seriously affect the performance of the entire castable. Therefore, we need to confirm with the manufacturer’s technical personnel when purchasing and inform the technical personnel according to the occasion of use. Technicians will provide you with a variety of options based on your usage situation.
Secondly, we mainly look at the following aspects that affect the quality of high-aluminum castables during use. Including compressive strength, thermal stability, thermal conductivity, thermal expansion coefficient, etc. The testing agencies of these manufacturers will issue reports when they submit them for inspection, so we must ask the manufacturers for the inspection report when purchasing. From the report we will get some parameters we want if the parameters meet the standards or are above the standard line. It shows that the quality of high aluminum castable is good.
Also, when we purchase high-aluminum castables if the above two aspects meet the standards, we can first purchase some samples from the manufacturer for experiments. This can ensure to the greatest extent an effect on our future use. If the experiment is qualified, it will not be too late for us to purchase in large quantities. If we make large-volume purchases without conducting experiments in the early stage, our losses will be very large. This will not only be the cost of raw materials, but also our entire kiln may need to be reconstructed.
Everyone must know how to choose high-aluminum castables with good results. Finally, when purchasing, we must consider the overall cost and performance. In addition to considering various indicators of raw materials, understanding the manufacturer, brand, and market reputation of the product is also one of the important factors in ensuring the selection of high-quality high-aluminum castables.
In addition to the methods mentioned above, we also need to pay attention to the following points when purchasing high-aluminum castables. First of all, we must choose high-aluminum castables produced by regular manufacturers, so as to ensure the quality and performance of the product. Secondly, pay attention to the packaging method of high-aluminum castables. Generally speaking, the packaging should be tight and there should be no damage or air leakage to prevent the product from being damaged during transportation. In addition, carefully check the production date and shelf life of the product, and choose products with a recent production date and a longer shelf life to ensure product quality and performance. Finally, you should consult the manufacturer’s after-sales service to understand the after-sales guarantee and technical support of the product, so that you can get timely help and support if problems arise during use. By comprehensively considering the above factors, selecting high-aluminum castables with excellent performance and reliable quality can provide a strong guarantee for the construction of high-temperature kilns and the production of smelting materials.
High Alumina Refractory Blog 