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This Alumina Ceramic Bushing Insulator is manufactured from high-purity alumina (Al₂O₃) precision ceramic material, these products are created through isostatic pressing, high-temperature sintering, and precision machining. Designed for extreme operating conditions—characterized by high temperatures, heavy wear, corrosive environments, and high-voltage requirements—they combine extreme hardness with outstanding wear resistance, corrosion resistance, and electrical insulation properties. They serve as indispensable precision components for the semiconductor, new energy, laboratory, and high-voltage electrical sectors, offering an ideal replacement for traditional metal bushings.
Alumina Ceramic Bushing Insulator for High-voltage Electrical Equipment
Product Description
Alumina Bushing offer exceptional insulation and high-temperature resistance (up to 1600°C), withstanding corrosion from plasma, acids, alkalis, and various solvents. Their ultra-low particle generation meets the stringent cleanroom standards required for wafer manufacturing. We offer customization options regarding purity (95%, 99%, or 99.9% alumina), precision tolerances, and surface finishes, making them suitable for diverse applications such as insulation liners for ion implanters, wear-resistant bushings for wafer handling robots, and thermal insulation sleeves for high-temperature tube furnaces. Compared to plastic, metal, or quartz alternatives, alumina bushings significantly reduce equipment failure rates and maintenance costs. We support comprehensive precision processing—including cylindrical grinding, metallization, slotting, and threading—to provide global industrial equipment manufacturers with one-stop custom solutions for industrial ceramic components.
Product Core Advantages
1. Ultra-high hardness and exceptional wear resistance
Alumina ceramic bushings feature a Mohs hardness of 9 (second only to diamond) and a Rockwell hardness of 80–90 HRA, far surpassing wear-resistant steel and stainless steel. Their wear resistance is 266 times that of manganese steel and 171.5 times that of high-chromium cast iron; they maintain extremely low wear rates (as low as 0.01 mm/1,000 hours) even under heavy-load, high-speed friction conditions, significantly extending equipment service life.
2.High-temperature resistance and excellent thermal stability
Long-term service temperature: 1450–1675°C (depending on purity grade)
Short-term service temperature: up to 1700–1750°C
Maintains excellent mechanical strength and dimensional stability at high temperatures; features a low coefficient of thermal expansion (6.5–8.0 × 10⁻⁶/℃), ensuring a good fit with metal shafts and preventing fit failure caused by temperature fluctuations.
3.Corrosion-resistant with excellent chemical stability
It exhibits outstanding chemical inertness against strong acids, strong alkalis, organic solvents, and molten metals. Capable of resisting various corrosive media even at high temperatures, it is suitable for highly corrosive environments in industries such as chemicals, petroleum, and metallurgy, effectively eliminating issues like metal bushing corrosion and seal failure.
4.Excellent electrical insulation properties
Volume resistivity (25°C): >1×10¹⁴ Ω·cm
Dielectric strength: 15–20 kV/mm
Dielectric constant (1 MHz): 9.5–9.7
Maintains excellent insulation performance across a wide frequency range—from DC to gigahertz—making it an ideal insulating support component for high-voltage electrical equipment and electronic components.
5.Precision machining ensures high dimensional accuracy.
Utilizing a combination of isostatic pressing, CNC precision machining, and diamond grinding/polishing processes, the following specifications are achieved:
Inner diameter tolerance: ±2–5 μm
Outer diameter tolerance: ±5–10 μm
Surface roughness: Ra ≤ 0.1 μm (polished surface) / Ra 0.2–0.6 μm (sintered surface)
The clearance with the shaft can be precisely controlled, ensuring smooth, vibration-free operation.
Technical Specifications
| Parameter Items | 95% Alumina | 99% Alumina | 99.5% Alumina | 99.8% Alumina |
| Density (g/cm³) | ≥3.60 | ≥3.8 | ≥3.85 | ≥3.9 |
| Water Absorption Rate | 0% | 0% | 0% | 0% |
| Mohs Hardness | 9 | 9 | 9 | 9 |
| Vickers hardness (HV) | 1500 | 1700 | 1700 | 1750 |
| Flexural Strength (MPa) | ≥320 | ≥338 | ≥379 | ≥400 |
| Compressive Strength (MPa) | ≥2000 | ≥2240 | ≥2240 | ≥2400 |
| Fracture Toughness (MPa·m½) | 3–4 | 4–5 | 4–5 | 4.5–5.5 |
| Coefficient of Thermal Expansion (×10⁻⁶/℃) | 5.0–8.0 | 6.2–8.0 | 6.5–8.0 | 6.5–7.5 |
| Thermal Conductivity (W/m·K) | 24 | 29 | 30 | 32 |
| Maximum Operating Temperature (°C) | 1450 | 1600 | 1675 | 1750 |
| Thermal Shock Resistance (ΔT, °C) | ≥220 | ≥200 | ≥250 | ≥280 |
| Volume Resistivity (25°C, Ω·cm) | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ |
| Dielectric Strength (kV/mm) | 18 | 18 | 19 | 20 |
| Dielectric Constant (1 MHz) | 9.5 | 9.7 | 9.7 | 9.8 |
| Color | white/ivory | ivory white | ivory white | ivory white |
Product Applications
1.Mechanical Seals and Bearings
pump and Valve Bushings: Used in chemical pumps, magnetic drive pumps, metering pumps, etc.; serve as replacements for metal bushings; resistant to acid and alkali corrosion; extend service life by 10–20 times.
ceramic bearing Inner/Outer Rings: Precision bearing components for high-speed, unlubricated operating conditions.
sealing Rings/Slip Rings: Bushings paired with the rotating and stationary rings of mechanical seals to prevent media leakage.
2.Valve and Piping Systems
valve bushings: installed inside the valve bonnet to provide sealing and guidance; resistant to high temperatures, high pressures, and corrosion.
pipe elbow liners: used in material transport pipelines to withstand abrasive wear and erosion-corrosion.
thermocouple protection tubes: provide insulation and protection for thermocouples during high-temperature measurements.
3.Electronics & Electrical
high-voltage insulator bushings: insulating supports and isolation components for power equipment
electronic component substrate bushings: insulating positioning components for high-frequency circuits
semiconductor equipment bushings: Precision insulating components for cleanroom environments
4.Textiles and Cables
textile machinery yarn/thread guides: Wear-resistant and smooth to prevent yarn damage
wire and cable conduits: Highly insulating, wear-resistant protective sleeves for cables
5.Metallurgy and Mining
high-temperature furnace liners: structural support components made of refractory materials
slurry pump liners: resistant to abrasive wear and chemical corrosion
continuous casting machine nozzle liners: resistant to molten steel erosion and thermal shock
6.Medical and Food
medical device bushings: Bio-inert; meets implant-grade requirements
food processing equipment bushings: Lubrication-free and contamination-free; meets food-grade hygiene standards
Product Series
| Series Name | Purity Grade | Typical specifications (inner diameter × outer diameter × length) | Key Features |
| Standard Bushing | 95% Al₂O₃ | φ10×φ16×20 – φ100×φ120×200 mm | great value for money; versatile and durable. |
| Precision Bushing | 99% Al₂O₃ | φ5×φ10×10 – φ80×φ100×150 mm | high precision, low friction |
| High-purity Bushing | 99.5% Al₂O₃ | φ3×φ8×5 – φ60×φ80×120 mm | ultra-high insulation, low impurity content |
| Ultra-high Purity Bushing | 99.8% Al₂O₃ | customized | semiconductor-grade cleanliness |
| Toughened Bushing | ZTA (Zirconia-Toughened Alumina) | fracture toughness increased by 2–3 times. |
Molding and Processing Technologies
| Process Stage | Technical Specifications |
| Powder Preparation | high-purity α-Al₂O₃ nanopowder with a particle size (D50) of ≤0.5 μm and strictly controlled Na, Fe, and Si impurities. |
| Molding Process | dry pressing / Isostatic pressing / Hot pressure casting / Injection molding (selected based on complexity) |
| Sintering Process | high-temperature sintering (>1600°C), relative density ≥99.5% |
| Precision Machining | diamond grinding, CNC turning, internal grinding, centerless grinding, precision lapping and polishing |
| Surface Treatment | mirror polishing (Ra ≤ 0.1 μm), glazing, metallization (Mo-Mn method), laser marking |
| Quality Inspection | coordinate measuring, surface roughness testing, hardness testing, metallographic analysis, helium mass spectrometry leak detection |
Quality Assurance
coordinate Measuring Machine (CMM): Geometric accuracy inspection
scanning Electron Microscope (SEM): Microstructure analysis
X-Ray Diffraction (XRD): Crystalline phase composition verification
Universal Testing Machine: Mechanical property testing
4. Clean Delivery: Cleaning in Class 100 cleanrooms and vacuum packaging to meet the cleanliness standards of the semiconductor and medical industries.
Customized Services
| Customized Item | Services Offered |
| ingredient formula | 95% / 99% / 99.5% / 99.8% / ZTA / colored alumina (options available) |
| dimensions and specifications | inner diameter φ3–φ200 mm, outer diameter φ8–φ250 mm, length 5–300 mm |
| tolerance grade | standard grade (±0.05mm) / Precision Grade (±0.01mm) / Ultra-precision Grade (±0.002mm) |
| surface treatment | sintered surface / ground surface / mirror-polished surface / glazed / metallized |
| structural form | straight / stepped / flanged / grooved / special-shaped structure |
| straight / stepped / flanged / grooved / special-shaped structure | precision bonding, interference fit, and threaded connection with metal flanges/ceramic bases. |
Our workshop
|
CNC Workshop |
Testing Room |
|
Surface grinding Workshop |
Sintering Workshop |
|
Circular Grinding Workshop |
Injection molding Machine Workshop |
Why choose us?
1.Customized R&D, rather than standard product adaptation
2.Deep control of materials science：Material Selection Based on Needs，Microstructure Optimization，Batch Consistency
3.Precision machining capability：Flatness can reach 0.001mm, parallelism 0.002mm, and roughness Ra 0.1μm.
FAQ
Q1: What products does your company offer?
We specialize in high-performance ceramics such as alumina and silicon nitride, providing insulators, structural components, wear-resistant parts, and customized solutions.
Q2: Can you customize non-standard parts?
Yes. We support processing based on provided drawings and collaborative technical development, offering a full-process service from design to mass production.
Q3: What about accuracy and delivery time?
Standard tolerance ±0.05mm, precision grade ±0.01mm; samples 7-15 days, bulk orders 20-30 days.
Q4: Main application areas?
Power, electronics, machinery, chemical, and aerospace industries.
Q5: Quality assurance measures?
Full-process quality inspection, providing material reports and performance test data, supporting third-party certification and testing.
Q6: Do you provide technical support?
We provide professional support such as material selection consultation, design optimization, and failure analysis.
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