Wear resistant alumina ceramics are widely used in various mechanical equipment with high wear due to their high toughness, high bending strength and high wear resistance. Regarding the different installation methods of wear-resistant alumina ceramics, they each have unique advantages and disadvantages.
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First Adhesive installation, the ceramic lining is pasted on the surface of the equipment through wear-resistant ceramic glue. Its advantage is that the installation is simple and fast, suitable for large-area construction, and can save maintenance time. However, the temperature resistance range of this method is limited, usually within 300 degrees Celsius, so it is more suitable for normal temperature working environment.
Second Welding installation, the ceramic lining is fixed on the equipment by welding, and its advantage is that it provides higher stability and high temperature resistance, suitable for high temperature or slight impact conditions. However, the installation process of this method is relatively complicated and the cost is higher.
In addition, there are bolt connection and dovetail slot installation, each of which is suitable for specific working conditions, such as large-block material impact or material transportation in high temperature environment.
Alumina ceramics have high strength, high hardness, excellent corrosion resistance and wear resistance, but high brittleness and poor processing performance. Kovar alloy has the advantages of low temperature constant expansion, good thermal matching performance and easy processing. Therefore, the combination of alumina ceramic and kovar alloy can obtain ceramic metal welding parts with excellent properties of both ceramic and metal.
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1. High wear resistance: Alumina ceramics have excellent wear resistance, far superior to other materials, such as manganese steel and high chromium cast iron, which helps to extend the service life of the equipment.
2. Low density: Its density is only half that of steel, which means that at the same volume, alumina ceramics can carry more weight, thereby reducing equipment load and improving efficiency.
3. High temperature resistance: Alumina ceramics can be used for a long time at temperatures up to °C, suitable for extreme thermal environments.
4. Corrosion resistance: It can resist acid, alkali and other chemical substances, suitable for various chemical treatment occasions.
5. Good electrical insulation: especially in high temperature environments, alumina ceramics can withstand high voltages and are not susceptible to electromagnetic interference.
6. Self-lubricity: The low coefficient of friction of alumina ceramics makes it an ideal material for sliding or rotating parts, reducing maintenance requirements.
7. High pressure resistance: Alumina ceramics can withstand high pressure and remain stable even in high temperature and high pressure environments.
1. Poor toughness: the toughness and thermal shock resistance of alumina ceramics are not good, and they cannot withstand sharp changes in temperature, so special attention is needed in processing and use.
2. Processing difficulties: Due to its high hardness and brittleness, alumina ceramics are easy to lead to tool wear and fracture during machining, increasing the processing cost.
1. Good weldability: Kovar alloy has good weldability and can maintain good air tightness even after nickel plating
2. Pre-welding treatment is important: stress relief annealing should be carried out on the Kovar alloy parts before welding to avoid thermal cracks caused by stress
3. Large thermal resistance: Replaceable alloys have a large thermal resistance (i.e., a small thermal conductivity) and therefore conduct heat more slowly, making them suitable for applications where slow heat dissipation is required.
1. Low thermal conductivity: Due to the small thermal conductivity of Kovar alloy, heat is not easily transmitted during the welding process, which may affect the welding efficiency and effect
2. Weld position limitation: In order to prevent ceramic or glass seals from cracking due to overheating welding areas, welding should ensure that the weld is at least 5 to 6 mm away from the ceramic or glass sealing surface.
3. Material compatibility issues: Silver and its alloys should not be present near the weld, as they may cause cracking of the kovar alloy.
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