High-temperature Alumina ceramic-lined pipes are composite pipes with a high-temperature sintered Alumina ceramic lining and a metal (typically carbon steel or alloy steel) outer layer. Their core advantage lies in their ability to maintain excellent wear resistance, corrosion resistance, and structural stability even under high-temperature conditions. They are widely used in high-temperature material transportation applications in industries such as power, metallurgy, and chemicals.

The core performance of high-temperature Alumina ceramic-lined pipes stems from the material properties of high-temperature alumina ceramic and their "ceramic-metal composite structure" design. Specific advantages are as follows:

1. Superior High-Temperature Resistance

The Ceramic Lining utilizes a high-temperature sintering process (sintering temperature ≥1600°C). The alumina (Al₂O₃) content is typically ≥95% (some high-end models reach 99%). The pipe can withstand long-term operating temperatures of up to 800°C and short-term peak temperatures of 1200°C, far exceeding the performance of conventional ceramic-lined pipes (≤300°C). This makes it suitable for conveying media such as high-temperature slag, molten salt, and high-temperature flue gas. 2. Extreme Wear Resistance

High-temperature Alumina ceramics have a microhardness of HV1200-1800 (equivalent to HRA ≥88), making them 3-5 times more wear-resistant than hardened steel (HV600) and 2-3 times more wear-resistant than high-chromium cast iron (HV800). Even at high temperatures (e.g., 600°C), the hardness only drops by 5%-8%, making them highly resistant to erosion and wear from high-temperature materials (such as high-temperature slag transportation in the metallurgical industry).

3. Excellent Corrosion Resistance

High-temperature alumina ceramics are inorganic, inert materials that do not react with strong acids (except hydrofluoric acid), strong bases, or molten metals (such as molten aluminum and copper) at high temperatures. They are resistant to corrosion from high-temperature acidic flue gases (such as high-temperature desulfurization flue gases from the power industry) and alkaline ore slurries, addressing the high-temperature corrosion failure problem of ordinary metal pipelines. 4. Low Thermal Conductivity + Stable Structure

The ceramic lining has a thermal conductivity of only 0.8-1.5 W/(m・K) at room temperature, which is 1/20 that of carbon steel. This effectively reduces heat loss from high-temperature materials within the pipeline. Furthermore, the "transition layer design" (a nickel-based alloy transition layer added between the ceramic and metal) mitigates the difference in thermal expansion coefficients between ceramic and metal (the thermal expansion coefficient of ceramic is approximately 7 × 10⁻⁶/°C, while that of carbon steel is approximately 13 × 10⁻⁶/°C), thus preventing cracking or peeling of the ceramic lining under high-temperature conditions.

5. Smooth Inner Surface + Low Resistance

The ceramic lining has a surface roughness of Ra ≤ 0.8μm, significantly lower than that of metal pipes (Ra ≥ 3.2μm). This reduces material conveying resistance (15%-20% lower than that of ordinary steel pipes), resists scaling and clogging, and is particularly suitable for conveying high-temperature, viscous materials (such as high-temperature molten resins in the chemical industry).

II. Key Technical Parameters: