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Large-Diameter Alumina Ceramic Sleeve Alumina ceramic sleeve lined pipe bend Wear Resistant Large Diameter Alumina Ceramic Sleeve Tube ...
Product Description
The large-diameter alumina ceramic sleeve is a circular structure ceramic component made of high-purity alumina (Al ₂ O3) material with 92-99% Al ₂ O3 high-purity alumina powder as the core raw material, and manufactured through advanced molding technology and high-temperature sintering technology. Its unique design and excellent physical and chemical properties make it an ideal choice for extreme industrial environments such as high temperature, high pressure, and corrosion. Large-sized circular ceramic components are made through advanced processes such as precision molding and high-temperature sintering.
The product diameter covers the range of 50mm-800mm and can be customized with different inner diameters, outer diameters, and height dimensions according to customer needs (size tolerance controlled within ± 1mm, meeting the needs of large equipment and pipeline lining, designed specifically for wear resistance, corrosion resistance, high temperature resistance, and insulation requirements.
Technical parameters
| Items |
Specifications |
| Content of alumina |
≥92% |
≥95% |
| Density |
≥3.6 g/cm3 |
>3.8g/cm3 |
| Rockwell A hardness |
≥82HRA |
≥85HRA |
| Impact strength |
≥1200 MPA |
≥1500 MPA |
| Fracture toughness |
≥3.8MPa·m1/2 |
≥4.0MPa·m1/2 |
| Vickers hardness |
≥1150HV10 |
≥1200HV10 |
| Bending Strength |
≥290MPa |
≥330MPa |
Product Features and Advantages
Ultra-High Hardness and Wear Resistance: Alumina ceramic rings have a Mohs hardness of 9, second only to diamond. This results in exceptional wear resistance, over 200 times that of stainless steel. In high-wear environments such as the chemical and mining industries, they can significantly extend equipment life and reduce maintenance costs. For example, in a sand mill at a chemical company, our alumina ceramic rings have a service life of up to three years, while traditional metal rings only last three months.
Excellent High-Temperature Resistance: They can withstand temperatures up to 1700°C and maintain stable physical and chemical properties in high-temperature environments such as glass melting furnaces and metal smelting. A new energy battery production line uses our alumina ceramic rings as electrode supports. After 1000 hours of continuous operation at 200°C, their performance showed no significant degradation, effectively ensuring continuous and stable production.
Excellent Insulation and Corrosion Resistance: At room temperature, alumina ceramic rings have a resistivity of up to 10¹⁴Ω・cm, making them excellent electrical insulating materials. It also exhibits excellent resistance to strong acids and alkalis. In electronics factories, the use of our ceramic rings as insulation components in high-frequency transformers has significantly reduced product failure rates from 5% to 0.3%, significantly improving product quality and reliability.
Comparison of the advantages of alumina ceramic rings, welded alumina ceramic plate, and bonded alumina ceramic sheets
| Comparison Dimension |
Alumina Ceramic sleeves |
Welded Alumina Ceramic Plates |
Adhered Alumina Ceramic Sheets |
| Structural Adaptability |
Annular structure, specifically designed for rotation/sealing/axial fitting (e.g., mechanical seal dynamic/static rings, bearing sleeves). It fits tightly with shafts/housings and is naturally suitable for dynamic movement or sealing working conditions. |
Flat plate structure, requiring welding for fixation. Welding is extremely difficult (large melting point difference between ceramics and metals), and it cannot meet the needs of rotation or annular sealing. |
It can be spliced into an annular shape, but each sheet is small in size and requires multi-sheet splicing. Gaps or stress concentrations easily occur at the splicing joints, affecting sealing/wear resistance. |
| Installation Convenience |
Integrally formed, directly sleeved/embedded into equipment without splicing, welding, or adhesion. It simplifies the process and reduces human operation errors. |
Requires welding (or brazing) to connect with metal substrates. The welding process may cause ceramic cracking due to thermal stress, and the quality depends on craftsmanship, resulting in unstable reliability. |
Requires adhesive to attach multiple ceramic sheets. The adhesive is prone to aging (more obvious in high-temperature/corrosive environments), and splicing joints are weak points. |
| Performance Consistency |
Monolithic structure of a single material, with no connection parts. Mechanical properties (e.g., strength, hardness), wear resistance, and corrosion resistance is evenly distributed, with better stability under high-speed rotation/high-temperature and high-pressure conditions. |
Thermal stress occurs at the welding joint due to the difference in thermal expansion coefficients, easily leading to cracking or falling off, with local defects in performance. |
Splicing joints are prone to ceramic sheet falling off due to adhesive failure or particle impact, and the overall performance is greatly affected by splicing quality. |
| Wear Resistance & Sealing |
Forms a high-precision sealing surface with mating rings (e.g., silicon carbide). High hardness + low friction coefficient ensures minimum wear and extremely low leakage rate during long-term operation. |
The flat plate structure makes it difficult to form a precise sealing surface. Welding defects may cause uneven sealing surfaces, resulting in a high leakage risk, and wear resistance is restricted by welding quality. |
The sealing surface at the splicing joint is discontinuous, and particles are easily embedded in the gaps, accelerating wear, and the leakage risk increases with service time. |
| Adaptability to High Temperature & High Pressure |
Excellent high-temperature stability (melting point 2050℃) and low thermal expansion coefficient (approximately 7×10⁻⁶/℃). It maintains structural integrity under temperatures above 800℃ and pressures above 10MPa, without relying on adhesives or welding layers. |
The welding layer is prone to softening/oxidation at high temperatures, leading to a sharp increase in the risk of the ceramic plate falling off, and it cannot withstand high temperatures and high pressure for a long time. |
The adhesive is prone to decomposition at high temperatures, and the probability of the ceramic sheet falling off increases significantly in high-temperature environments. Splicing joints are easily damaged under high pressure. |
FAQ
Q: Are large-diameter ceramic rings (e.g., φ800mm) customizable? How long is the customization turnaround?
A: Full-size customization is available. Customers are required to provide 2D/3D drawings (indicating dimensional tolerances, surface roughness, and operating conditions). The customization process is as follows: drawing confirmation → sample production (15-20 days) → sample testing → mass production (30-45 days). The total turnaround time is 45-65 days, which can be adjusted based on order quantity.
Q: Is the product warranty provided? How long is it?
A: A one-year warranty is provided. During the warranty period, if a product becomes unusable due to quality issues, we will provide a free replacement.
Q: What is the sample application process? Can the sample fee be deducted from subsequent orders?
A: Sample application process: Customer submits sample requirements (specifications, quantity, and intended use) → We provide a quote → Customer pays the sample fee → Samples are shipped within 7-10 days. If the customer places a bulk order (amount ≥ 50,000 RMB) within 3 months, the sample fee can be fully deducted from the purchase price.
Q: The maximum outer diameter is 800 mm. Can the thickness be even thinner?
A: The minimum wall thickness is 2 mm, but strength assessment is required. An FEM thermal stress simulation report can be prepared.
Q: Do you provide installation technical support?
A: Free installation guides and video tutorials are provided.
Q: How do I choose the appropriate sleeve size?
You'll need to identify the inner diameter, outer diameter, length, wall thickness, and operating environment parameters (temperature, pressure, and media). Please contact our technical department for selection guidance.
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