Performance characteristics and advantages and disadvantages of alumina ceramics

The main characteristics of alumina ceramics:

1. Due to its characteristics of high temperature resistance, corrosion resistance, and high strength, it is well used in the lining of refractory materials, ceramics, and ironmaking blast furnaces; Spark plugs, high-temperature resistant and antioxidant coatings.

2. Due to its high hardness, good wear resistance, and high compressive strength, it is also widely used in chemical systems.

3. Aluminum oxide belongs to the ionic type and has a stable structure. Therefore, it is also widely used in the electronics industry.

4. Aluminum oxide ceramic products have good airtightness and are tightly airtight even under high temperature resistance, making them widely used in the electrical field.

5. The wear resistance of alumina ceramics is good, equivalent to 266 times that of manganese steel and 171.5 times that of high chromium cast iron.

6. Aluminum oxide ceramic insulation materials are also widely used in the walls and roofs of various high-temperature resistant furnaces and kilns, providing both high temperature resistance and insulation.

7. Aluminum oxide ceramics are lightweight, and the density of ceramic materials is generally not high. Similarly, aluminum oxide ceramics have a density of only 3.5g/cubic centimeter, which is only 50% of iron. Therefore, if some iron based accessories are replaced with aluminum oxide, their weight will be greatly reduced (of course, due to the high brittleness of aluminum oxide, not all places are suitable).

Disadvantages of alumina ceramics: Although alumina ceramics have many advantages, their limitations are also quite obvious. Due to its high hardness and brittleness, mechanical processing is difficult, which is also a major reason for the high cost of precision machined alumina ceramic parts.