Wear mechanism of alumina wear-resistant ceramic sheets:
According to different working conditions and stress conditions, the wear of wear-resistant ceramic sheets can be roughly divided into several categories such as cutting wear, fatigue wear, abrasive wear, and impact wear. Due to each type The working principles of wear are different, so the wear mechanisms of ceramic sheets are also quite different. In practical applications or experiments, they often do not act in isolation, but are interconnected and influence each other. Sometimes one mechanism is obvious. Sometimes it is a combination of two or more mechanisms.
Service life of alumina wear-resistant ceramic sheets:
In addition to its own quality, the service life of wear-resistant ceramic sheets is also related to external factors. It mainly includes media particle size, hardness, friction mode, environment, load, and erosion. Speed, temperature and time, etc. Generally speaking, the smaller the particles, the lower the concentration, the lower the scouring speed, and the smaller the scouring angle.The service life of wear-resistant ceramic sheets is longer. Usually in the network tube of the slag micro powder production line, the specific surface area of the micro powder is 420~450m2/kg, the concentration is 350g/Nm3, the speed is 28~30m/s, and the scour angle is 30℃, 20mm wear-resistant ceramic sheets can be used 8 to 10 years. The materials ground by raw mills and clinker mills are easier to grind than slag. The wear-resistant ceramic sheets of the same thickness can have a service life of more than 10 years.
Performance characteristics of alumina wear-resistant ceramic sheets:
1. High hardness, wear resistance and erosion resistance: 92 porcelain and 95 porcelain alumina wear-resistant ceramic sheets. The Rockwell hardness is HRA85-95, which is comparable to diamond in wear resistance. Much higher than manganese steel and high-iron cast iron, it can extend the service life of equipment by more than 10 times under the same working conditions;
2. High temperature resistance and excellent heat resistance: can be used at 750Long-term operation at ℃;
3. Resistance to acid and alkali corrosion: Alumina wear-resistant ceramics have stable chemical properties, are resistant to acid and alkali corrosion and oxidation, and are adaptable to various harsh working conditions;
4. Light weight: The density of wear-resistant ceramic sheets is 3.5-3.8g/cm3, which is only half that of steel, which can greatly reduce the equipment load;
5. Strong bonding and not easy to fall off: Wear-resistant ceramic sheets can be fixed using high-temperature-resistant inorganic adhesives, arch joints and stud welding to ensure that the ceramic sheets remain in place. It will not fall off after long-term operation under high temperature and high impact conditions.
Main technical indicators of wear-resistant ceramic sheets:
Alumina content: 92%~99%
Density: 3.5-3.8g/cm3
Rockwell hardness: HRA85-95
Compressive strength: ≥850 Mpa
Fracture toughness: KΙC ≥4.8MPa·m1/2
Bending strength: ≥290MPa
Thermal conductivity: 20W/m.K
Thermal expansion coefficient: 7.2×10-6m/m.K
