Publish Time: 2022-07-31 Origin: Site
Kiln Furniture is a special-shaped refractory material that supports and protects ceramic products and magnetic materials in the firing process. The performance of Kiln Furniture directly affects the quality and production cost of fired objects such as ceramics. So what are the basic properties and development trends of Kiln Furniture materials? Let's take a look.
The following is a list of contents:
Basic properties of Kiln Furniture materials
Development trend
(1) High fire resistance, good thermal shock resistance, and chemical stability. The firing of modern ceramics is developing towards fast firing, and thermal shock resistance is particularly important; Kiln Furniture with good high-temperature chemical stability is not easy to react with products.
(2) High strength at room temperature and high temperature. One of the functions of Kiln Furniture is load-bearing, which must withstand the load of the products and Kiln Furniture itself; high-strength Kiln Furniture materials can make the Kiln Furniture light and thin, to increase the density of the kiln and improve the quality of the products.
(3) Good thermal conductivity and low thermal storage. The production of products tends to be high-quality, high-yield, and low-consumption, and the firing process tends to be fast, which requires Kiln Furniture to have less heat storage and faster heat transfer.
(4) The appearance is regular and the size is accurate. The firing deformation of the product is related to the flatness of the saggar; the size of the saggar is accurate, which is conducive to mechanized operation and improves production efficiency. The current Kiln Furniture materials mainly include silicon carbide, cordierite, cordierite-mullite, mullite, mullite-corundum, fused silica, aluminum titanate, aluminum titanate-mullite, and other materials among which carbonized the siliceous and cordierite Kiln Furniture are the most widely studied and used.
Based on the development of ceramic Kiln Furniture materials at home and abroad, it can be seen that there are two major trends: one is the magnesium-aluminum-silicon series, namely the cordierite series, which has the advantages of uniform physical and chemical properties and can produce products with precise shapes and sizes; It is a silicon carbide series with satisfactory strength, thermal conductivity and thermal shock resistance. In the low-temperature sintering of silicon carbide, the self-propagating (SHS) sintering SiC method has great advantages in energy saving and environmental protection. The key to this method lies in how to select the metal powder and oxygen supply agent in the reaction raw materials. It uses the metal powder, oxygen supply agent, and nitrogen in the air when SiC products are fired at a relatively low temperature (1350-1450 °C). The reaction is carried out to generate SiAlON to bind the silicon carbide, and at the same time, high heat is released during the reaction, so that the sintering continues. The method is easy to sinter and has low cost, and is a very promising method.
In addition, at present, the materials of Kiln Furniture are generally mainly based on a single material. Kiln Furniture of a single material has its unique performance advantages, but there are also some insurmountable weaknesses, such as cordierite-mullite has excellent thermal shock resistance, but the high-temperature load-deformation temperature is low; Stone-corundum has high chemical stability and service temperature, but poor thermal shock resistance; silicon carbide has a good high-temperature load-deformation temperature, but it is easily eroded in a strong oxidizing atmosphere and is limited. Composite Kiln Furniture can combine the advantages of various materials, make advantages of advantages and avoid disadvantages so that Kiln Furniture has excellent composite characteristics. At present, the more successful is the mullite corundum-silicon carbide composite three-layer board. The outer layer is made of mullite-corundum composite material, which has the advantage of excellent corrosion resistance in different atmospheres. The middle layer is black Silicon carbide exerts its extremely high-temperature load-deformation temperature to make up for the lack of high-temperature load of the outer layer, so that the Kiln Furniture has both the high stability and low pollution of mullite, and the high-temperature strength of silicon carbide. It is believed that more composite Kiln Furniture will appear and be put into use in the future.
The above is about the basic properties and development trends of Kiln Furniture materials. If you are interested in Kiln Furniture, you can contact us. Our website is https://www.yufengrefractory.com/.