Zirconia ceramic heat-insulated pipes
Alias: high-temperature resistant industrial ceramic rolls, threaded fixed hollow pipes, insulated multi-groove ceramic wheels
Description：
Zirconia heat-insulated pipe (also known as ceramic roll or multi-groove ceramic tube) is an important high-temperature material with excellent heat resistance and chemical stability, and is widely used in high-temperature industrial fields, such as metallurgy, glass, ceramics and other industries.
Features:
1. Material properties
1.1 Color
Zirconia heat-insulated pipes are usually white in color, which is their typical appearance feature and also conforms to the general characteristics of ceramic materials.
1.2 Density
The density of zirconia insulation pipe is about 6g/cm³, which makes it have a high material compactness, which is conducive to improving its wear resistance and high temperature resistance.
1.3 Zirconia content
The main component of this insulated pipe is zirconia, the content of which reaches 94.40%, which guarantees the material excellent high temperature resistance and chemical stability.
1.4 Breathability and water absorption
The air permeability of the zirconia insulation pipe is 0 and the water absorption rate is 0%, indicating that it has extremely low gas permeability and moisture absorption rate, and is suitable for high temperature and high-pressure environments.
1.5 Grain size
Its grain size is about 0.5μm, indicating that it has a fine grain structure, which is conducive to improving the strength and hardness of the material.
2. Mechanical properties
2.1 Rockwell and Vickers hardness
The zirconia insulation pipe has a Rockwell hardness (R45N) of 78 and a Vickers hardness (500g load) of 11.5 GPA (1175 kg/mm²), indicating that it has high hardness and wear resistance.
2.2 Flexural strength and compressive strength
At 20℃, the flexural strength of the insulation pipe reaches 800 MPa and the compressive strength is 2000 MPa, indicating that it has excellent mechanical strength and compressive properties.
2.3 Modulus of elasticity and fracture toughness
Its elastic modulus is greater than 200 GPA, and the fracture toughness is 9 MPa·m1/2, which indicates that the zirconia heat insulation pipe has high rigidity and impact resistance
3. Thermal properties
3.1 Thermal conductivity
The thermal conductivity of zirconia insulated pipes is about 2.5 W/(m·K) in the range of 20°C to 400°C, which is an insulating material that helps it maintain a stable temperature in high-temperature environments.
3.2 Coefficient of thermal expansion
Its coefficient of thermal expansion is 9.6×10^-6/°C, indicating that it has a certain thermal expansion, but it is relatively small, which helps to reduce thermal stress during thermal cycling.
3.3 Thermal shock resistance
Zirconia heat-insulation pipe has excellent thermal shock resistance, and its thermal shock temperature difference reaches ΔT250°C, indicating that it can maintain stable performance in a rapidly changing temperature environment and is not prone to thermal cracks or fractures.
Applications:
Zirconia insulated pipes are widely used in the following fields due to their excellent high-temperature performance and chemical stability:
- Metallurgical industry: used as a heat insulation pipe for high-temperature melting furnace to improve temperature stability and thermal efficiency in the furnace.
- Glass industry: used as a roll or insulating pipe for glass melting furnaces to resist erosion and abrasion of high-temperature glass.
- Ceramic industry: rolls for ceramic forming machines to improve the production efficiency and quality of ceramic products.
Zirconia heat-insulation pipe has become one of the indispensable materials in the field of high-temperature industry due to its excellent physical and mechanical properties, as well as its stable performance in high-temperature environments.
