When choosing 92% or 95% alumina ceramic sheets, you need to consider multiple factors such as the use environment, performance requirements, and cost. The following are some reference points:
Use environment
Chemical environment: If the ceramic sheet will be exposed to corrosive chemicals such as strong acids and alkalis, 95% alumina ceramic sheets are a more suitable choice due to their higher alumina content and better corrosion resistance. For example, in application scenarios such as the lining of chemical raw material storage tanks and the inner wall of chemical delivery pipelines, 95% alumina ceramic sheets can better resist chemical erosion and extend the service life of equipment.
Temperature environment: For high temperature environments, 95% alumina ceramic sheets have better high temperature resistance and can withstand higher temperatures without deformation or performance degradation. For example, in high temperature applications such as high temperature components of aircraft engines and heating element supports of industrial furnaces, 95% alumina ceramic sheets are more reliable. If the ambient temperature is relatively low, 92% alumina ceramic sheets can usually meet the requirements and have certain cost advantages.
Mechanical environment: In high-friction, high-impact mechanical environments, such as wear-resistant linings of mining machinery, material conveying pipelines in the cement industry, etc., the high hardness and high wear resistance of 95% alumina ceramic sheets can better resist wear and impact, reduce replacement frequency, and improve equipment operation efficiency. However, if the mechanical stress is small, 92% alumina ceramic sheets can also provide sufficient wear resistance and reduce costs.
Performance requirements
Strength and hardness: The bending strength of 95% alumina ceramic sheets is ≥ 300MPa, and the Vickers hardness is ≥1200HV10; while the bending strength of 92% alumina ceramic sheets is ≥ 280MPa, and the Vickers hardness is ≥1000HV10. If the equipment or components need to withstand greater pressure, wear, or impact, such as the lining plates and ceramic plungers of mining machinery, the high strength and high hardness of 95% alumina ceramic sheets can provide better support and wear resistance, and extend the service life.
Fracture toughness: The fracture toughness of 95% alumina ceramic sheets is 3.2MPa・m^(1/2), which is slightly higher than the 3.0MPa・m^(1/2) of 92% alumina ceramic sheets. In working conditions where there may be impact or stress concentration, the fracture toughness of 95% alumina ceramic sheets is more advantageous, which can reduce the risk of ceramic sheet rupture and improve the safety and reliability of components.
Electrical insulation performance
Cost factors
The production cost of 92% alumina ceramic sheets is relatively low, and the price is cheaper. In some cases where the performance requirements are not extremely stringent and the budget is limited, such as ceramic pipes, ordinary ceramic linings, etc., 92% alumina ceramic sheets are a more cost-effective choice, which can reduce production costs while meeting basic usage requirements.
