Alumina ceramics may be relatively unfamiliar to many people in the field of metal processing, but for our friends in the ceramic industry, they are already familiar and can no longer be familiar. Alumina ceramics have relatively good thermal conductivity and high temperature resistance. At present, it has been widely used in various places, and its characteristics have been studied more thoroughly. Below, our technicians from Junjie Ceramics shared with us the physical properties of some materials of alumina ceramics.
What are the characteristics of alumina ceramic materials?
1. The hardness of alumina ceramics is large. In the field of ceramics, the hardness of alumina is medium, and its Rockwell hardness is HRA80-90. Although not as hard as silicon nitride and silicon carbide, it is much harder than cemented carbide and stainless steel. This is also an important reason why it was selected as a wear-resistant part.
2. The weight of alumina ceramics is light, and the density of ceramic materials is generally not high. The same is true for alumina ceramics. Its density is only 3.5g/cm3, which is only 50% of iron. The weight of parts made of iron as a material will be greatly reduced after being replaced with alumina (of course, due to the high brittleness of alumina, it is not suitable for all places).
3. The wear resistance of alumina ceramics is good. According to the measurement of the Institute of Powder Metallurgy of Central South University, the wear resistance of alumina ceramics is equivalent to 266 times of manganese steel and 171.5 times of high chromium cast iron. According to our customer follow-up investigation over the past ten years, under the same working conditions, the service life of the equipment can be extended by at least ten times.
4. For other properties of alumina ceramics, people are always discovering new materials and researching new processes, and the same is true for ceramics. After years of development, people are not satisfied with the existing properties of alumina. In order to strengthen alumina ceramics and significantly improve its mechanical strength, recently a new alumina ceramic strengthening process has been introduced abroad. The process is novel and simple. The technical method adopted is on the surface of alumina ceramics, using electron beam vacuum coating, sputtering vacuum coating or chemical vapor deposition method, and coating a layer of silicon compound film at 1200℃～1580℃ The lower heating treatment can toughen the alumina ceramics.
Then the above points are the characteristics of alumina ceramics shared by the technical staff of Mingrui Ceramics. With people’s more in-depth research on alumina ceramics, its performance will be more excellent, the price will be more affordable, and the application will be more broad.