High-aluminum ceramic-liner tube is a composite, wear-resistant industrial pipe made by combining a high-purity alumina (Al₂O₃) ceramic layer with a metal base (such as carbon steel or stainless steel). Its typical structure includes:

Ceramic Lining layer: Alumina content ≥95%-99%, Mohs hardness 9, Vickers hardness HV1100-1400, and wear resistance over 20 times that of ordinary steel pipe.

Transition layer: Nickel-based alloy material to mitigate the difference in thermal expansion coefficients between ceramic and metal (ceramic: 4.5×10⁻⁶/°C; steel: 12×10⁻⁶/°C), with a bond strength of ≥50 MPa.

Metal base layer: Typically Q235-B or 20# seamless steel pipe, providing impact resistance and pressure-bearing capacity.

II. Core Performance Advantages

· Wear Resistance: The wear rate in quartz sand-containing slurries is only 1/20 that of steel pipes, extending service life by 5-10 times.

· Corrosion Resistance: Resistant to acidic and alkaline media with a pH of 2-12, with an annual corrosion rate of<0.01g in concentrated sulfuric acid.

· High-Temperature Stability: Withstands temperatures up to 900°C for long periods and 1200°C for short periods, and withstands rapid cooling and heating with a temperature difference of ≥800°C without cracking.

· Lightweight: Density is 3.6-3.9 g/cm³, half that of steel, reducing installation costs by 30%.

III. Main Production Processes

· Centrifugal Casting: The ceramic layer is formed through high-temperature centrifugal casting, achieving an inner wall roughness of ≤0.8μm. Suitable for straight pipes and standard components.

· Self-Propagating High-Temperature Synthesis (SHS): The ceramic layer is formed through the combustion reaction of thermite, resulting in high bonding strength and resistance to rapid cooling and heating. Ceramic patch method: Using dovetail guide rails and stud welding technology, the ceramic blocks are cured with high-temperature adhesive, making it suitable for complex pipe shapes.

IV. Typical Application Scenarios

· Mining: The life of tailings conveying systems has been increased from one year to five years.

· Power: High-temperature ash pipelines (800°C) have operated for five years without deformation.

· Chemical: Transporting 98% concentrated sulfuric acid for five years without leakage.

V. Selection and Maintenance Recommendations

· Purity Selection: 99% alumina is recommended for high-wear applications, while 95% is an option for general conditions.

· Process Validation: Centrifugal casting or SHS processes are preferred over patch methods (temperature resistance ≤ 100°C).

· Economic Evaluation: The lifecycle cost is 60% lower than that of stainless steel pipes.