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.
In summary, although Kovar alloy can be used as a welding material for ceramics in some cases, some of the above considerations and technical challenges need to be taken into account.
With the continuous development and progress of science and technology, alumina ceramic sheets with superior performance have been widely used in various fields. So what are the advantages and disadvantages of alumina ceramic sheets and how to identify them? Next, Pintejin ceramics will introduce to you.
First of all, we will introduce alumina ceramic sheets. Alumina ceramic sheets are also called wear-resistant alumina ceramic linings, high-alumina linings, wear-resistant ceramic linings, alumina ceramic patches. Alumina ceramic sheets are mainly made of AL2O3 as raw materials. It is calcined at a high temperature of &#; with rare metal oxides as a solvent.
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Because of its relatively dense structure and special properties, it is called special ceramics. Alumina ceramic material is a densely packed hexagonal structure composed of oxygen ions, and aluminum ions are filled in two-thirds of the octahedral gap, so alumina. The ceramic sheet has high melting point, high hardness and excellent wear resistance.
Moreover, the surface is smooth and the friction coefficient is small, and the wear resistance is very ideal, especially in high temperature oxidizing medium or corrosive medium, the material of alumina ceramic patch is much better than other metal materials.
First of all, we have to look at the surface of the alumina ceramic sheet. The surface of a good alumina ceramic sheet is very smooth, with no black spots on the surface and uniform color.
Secondly, we can identify the alumina ceramic sheet by measuring the density. The content of alumina can be known by measuring the density. Another method is to identify the quality of the alumina ceramic sheet by doing a wear test. The product has its positive reverse side.
Alumina ceramic sheet has high mechanical strength, good wear resistance, good corrosion resistance, good impact resistance, good thermal stability, abundant raw materials, low price, and environmentally friendly and pure products.
The ability of post-machining is low, and the product is not suitable for recycling.
The above are the advantages, disadvantages and identification methods of alumina ceramic sheets brought to you by Pintejin Ceramics. Pintejin Ceramics is a manufacturer specializing in the production and machining of ceramics, focusing on the machining of alumina ceramic pieces and zirconia ceramics, and can process ceramics according to your needs. product.
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