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Our High-purity Alumina Ceramic Resistorare specifically designed for demanding industrial and electronic applications. These products boast excellent high-temperature resistance (up to 1700℃), outstanding electrical insulation, superior mechanical strength, and excellent corrosion resistance, making them widely used in power electronics, aerospace, new energy vehicles, semiconductors, and high-temperature furnace equipment. Whether you require general electronic components or specialized resistors for extreme environments, we offer a one-stop solution from material selection and structural design to precision manufacturing, helping your products achieve higher power density, longer lifespan, and more stable electrical performance.
Customized High-purity Alumina Ceramic Resistor Strip Factory
Product Description
Alumina Ceramic Resistors are made from high-purity alumina (Al₂O₃) ceramic as the matrix, through isostatic pressing, high-temperature sintering, and precision machining. As the core carrier of resistors, it provides a highly insulating, high-temperature resistant, and dimensionally accurate ceramic framework for wire-wound resistors, metal film resistors, carbon film resistors, and thick-film resistors, and is a key material for ensuring the stability of resistor performance and service life. Depending on the purity grade, it is available in various specifications such as 95%, 96%, 99%, 99.5%, 99.8%, and 99.9% to meet the manufacturing needs of resistors with different precision, power, and environmental requirements.
Product Core Features
| Features | Detailed Description |
| Ultra-high Insulation | volume resistivity ≥10¹⁴ Ω·cm, dielectric strength ≥15 kV/mm, ensuring the resistor strip does not break down or leak under high voltage. |
| Excellent Temperature Resistance | the long-term operating temperature can reach 1600°C~1700°C, and the insulation performance does not degrade at high temperatures, exhibiting excellent thermal stability. |
| Extremely High Hardness | with a Mohs hardness of 9 and a Vickers hardness of 1600~2000 HV, it is not easily damaged during winding, ensuring the accuracy of the resistance value. |
| Precision Dimensions | precision machining with diamond ensures a diameter tolerance of ±0.02mm and a straightness of ≤0.1mm/m, guaranteeing winding uniformity. |
| Chemical Inert | resistant to acid and alkali corrosion, with no metal ion precipitation, thus avoiding contamination of the resistive film layer or drift in electrical properties. |
| Low Thermal Expansion | the coefficient of thermal expansion is 6.5~7.8×10⁻⁶/°C, the dimensions are stable with temperature changes, and the temperature coefficient of resistance (TCR) is controllable. |
| Excellent Surface Quality | the surface roughness Ra≤0.4μm and the smooth glaze facilitate uniform adhesion of the resistive film and reduce noise. |
Main Technical Parameters
| Parameter Items | 95% Al₂O₃ | 96% Al₂O₃ | 99% Al₂O₃ | 99.5% Al₂O₃ | 99.8% Al₂O₃ |
| Density | 3.65g/cm³ | 3.72 g/cm³ | 3.85 g/cm³ | 3.90 g/cm³ | 3.95 g/cm³ |
| Color | white | white | ivory white | ivory white | ivory white |
| Flexural Strength | 280 MPa | 300 MPa | 330 MPa | 350 MPa | 380 MPa |
| Compressive Strength | 2000 MPa | 2200 MPa | 2500 MPa | 2600 MPa | 3000 MPa |
| Vickers Hardness | 1400 HV | 1500 HV | 1600 HV | 1800 HV | 2000 HV |
| Dielectric Strength | 12 kV/mm | 13 kV/mm | 15 kV/mm | 16 kV/mm | 18 kV/mm |
| Volume Resistivity (25°C) | >10¹⁴ Ω·cm | >10¹⁴ Ω·cm | >10¹⁴ Ω·cm | >10¹⁵ Ω·cm | >10¹⁵ Ω·cm |
| Dielectric Constant (1MHz) | 9.0 | 9.2 | 9.5 | 9.8 | 10.0 |
| Dielectric Loss (1MHz) | 0.0003 | 0.0002 | 0.0002 | 0.0001 | <5×10⁻⁵ |
| Thermal Conductivity (20°C) | 20 W/(m·K) | 25 W/(m·K) | 28 W/(m·K) | 30 W/(m·K) | 35 W/(m·K) |
| coefficient of Thermal Expansion | 7.5×10⁻⁶/°C | 7.2×10⁻⁶/°C | 7.0×10⁻⁶/°C | 7.0×10⁻⁶/°C | 6.8×10⁻⁶/°C |
| Long-term Operating Temperature | 1400°C | 1500°C | 1600°C | 1650°C | 1700°C |
| Porosity | <0.5% | <0.3% | <0.1% | <0.05% |
<0.02% |
Product Structure and Types
Depending on the resistor manufacturing process, high-purity alumina ceramic resistor strips can be provided in various structural forms:
| Type | Structural Features | Applicable Resistor Types |
| Smooth Resistor Strip | smooth surface, no grooves or holes, cylindrical shape | wire-wound resistors, metal film resistors, carbon film resistors |
| Slotted Resistor Bar | the surface has spiral grooves or straight grooves | high-power wire-wound resistors increase heat dissipation area and wire adhesion |
| Perforated Resistor Strip | end face or side with lead hole/positioning hole | axial lead resistance facilitates end cap installation and lead fixing |
| Stepped Resistance Bar | structure with steps or reduced diameter at both ends | molded resistors facilitate end cap positioning and insulating encapsulation |
| Irregularly Shaped Resistor Strips | square, flat, or winged structures | special packaged resistors, power module integrated resistors |
| Glazed Resistor Strip | surface glazing treatment | resistors for high humidity environments, enhancing moisture resistance and insulation reliability |
Typical Application Scenarios
1.In the field of electronic components:
wire-wound resistors: used as the winding skeleton for resistance wires (nickel-chromium alloy, constantan, etc.), in precision power resistors, braking resistors, and shunt resistors.
metal film/carbon film resistors: used as the ceramic substrate for film deposition, in general-purpose and precision fixed resistors.
thick film resistors: used as substrate materials for thick film circuits, in hybrid integrated circuits and sensors.
high-voltage resistors: used in high-voltage dividers, bleeder resistors, X-ray equipment, and laser power supplies.
2.Power and Industrial Applications
braking resistor units: energy-consuming braking resistors in frequency converters, servo drives, and elevator systems
power electronic devices: voltage equalization/discharge resistors in IGBT modules and thyristor modules
welding machines and UPS: high-power current-limiting resistors and charging resistors
rail transit: traction system braking resistors and pre-charging resistors
3.Precision Instruments and Specialized Fields
precision measuring instruments: high-stability resistive elements in standard resistors, shunts, and bridge circuits
medical equipment: high-voltage current-limiting resistors in X-ray machines, CT equipment, and MRI equipment
aerospace: high-reliability resistor cores resistant to extreme environments
communication equipment: non-inductive resistors and matching resistors in high-frequency circuits
Manufacturing Process and Quality Assurance
1.Manufacturing Process
High-purity alumina powder → Isostatic pressing (uniform density) → High-temperature sintering (1650~1800°C)→ Diamond external cylindrical grinding → Centerless grinding finish → End face machining/grooving/drilling→ Surface quality inspection → Dimensional inspection → Cleaning and drying → Vacuum packaging → Shipment
2.Quality Control
raw material control: high-purity ultrafine alumina powder is selected, with strict control over impurity content and batch traceability.
density testing: 100% testing of porosity and water absorption to ensure no internal defects.
dimensional inspection: online diameter measurement using a laser diameter gauge and coordinate measuring machine (CMM) measurement of key dimensions.
electrical performance sampling inspection: sampling testing of dielectric strength, volume resistivity, and dielectric loss angle.
appearance inspection: no cracks, no chipping, no discoloration, and uniform glaze.
clean packaging: cleaned in a dust-free workshop, vacuum-sealed packaging for moisture and contamination prevention.
Customized Services
We offer comprehensive customized solutions:
| Customized Projects | Illustrate |
| Purity Grade | 95% / 96% / 99% / 99.5% / 99.8% / 99.9% / 99.96% (Optional) |
| Diameter Specifications | Φ1.0mm ~ Φ25.0mm, tolerance ±0.02mm ~ ±0.1mm |
| Length Specifications | 3mm ~ 300mm, can be cut as needed |
| Structural Form | smooth surfaces, grooved surfaces, perforated surfaces, stepped surfaces, and irregular shapes are all available for customization |
| Surface treatment | sintered state, ground state, polished state, glaze treatment |
| Special Requirements | metallized end face (Mo-Mn method), end cap pre-assembly, laser marking, clean packaging |
Selection Recommendations
| Application Scenarios | Recommended Purity | Recommended Accuracy | Key Considerations |
| General Purpose Wire-wound Resistors (for home appliances and lighting) | 95% ~ 96% | normal | cost-effectiveness, insulation, mechanical strength |
| Precision Metal Film Resistors (instruments) | 99% ~ 99.5% | precision | low dielectric loss, dimensional accuracy, and surface quality |
| High-power Braking Resistor (industrial frequency converter) | 96% ~ 99% | precision | high temperature resistance, thermal shock resistance, mechanical strength |
| High-voltage Resistors (medical X-rays, electrical systems) | 99.5% ~ 99.8% | ultra-precision | dielectric strength, insulation reliability |
| High-reliability Resistors for Aerospace/Military Applications | 99.8% ~ 99.9% | ultra-precision | full performance indicators, batch consistency |
| Thick Film Circuit Boards / High Frequency Applications | 99.5% ~ 99.9% | precision | low dielectric loss, high thermal conductivity, and smooth surface finish |
Our workshop
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CNC Workshop |
Testing Room |
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Surface grinding Workshop |
Sintering Workshop |
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Circular Grinding Workshop |
Injection molding Machine Workshop |
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