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T/TAlumina ceramic rod is a kind of high - performance ceramic product, which is widely used in many fields due to its excellent physical and chemical properties.
Diameter: the original design for correct resistance value and power rating.
Length: Determines the length available for the resistive winding.
Length of the resistive winding section.
Alumina Purity: e.g., 96%, 99%, 99.5% (higher purity often means better thermal performance).
Surface Finish: A smooth finish is needed for consistent winding.
Dimensional Tolerances: Precise dimensions are crucial for automated manufacturing.
In summary, the alumina ceramic rod is the heart of a high-performance wirewound resistor. It is far more than a simple insulator; it is a multifunctional component that provides structural integrity, electrical isolation, and, most importantly, the thermal management needed for reliable, high-power operation.
Technical Parameters
| Item | Unit | Zirconia ceramic | 99% alumina ceramic | 96% alumina ceramic | 95% alumina ceramic | Steatite ceramic | Mullite ceramic | Cordierite ceramic |
| Bulk density | g/cm3 | 6 | 3.8 | 3.7 | 3.6 | 2.8 | 2.2 | 2.3 |
| Water absorption | % | 0 | 0 | 0 | 0 | 0 | 12 | 12 |
| Thermal Conductivity | (w/m.k) | 10 | 19-30 | 16-28 | 14-24 | 2-3 | 2-6 | 1.3-1.8 |
| Resistance to thermal shock,Minimum | TK? | 70 | 150 | 140 | 140 | 80 | 150 | 300 |
| Withstand voltage,Minimum | KV | 15 | 20 | 18 | 18 | 20 | 25 | - |
| Flexural strength | Mpa | 1000 | 300 | 280 | 240 | 120 | 120 | 30 |
| Sintering temperature | ℃ | 1500 | 1670 | 1600 | 1600 | 1250 | 1250 | 1250 |
| Maximum working temperature | ℃ | 1200 | 1500 | 1200 | 1200 | 800 | 1000 | 1000 |
Application
Specifically used for high-temperature and high-voltage insulation parts, circuit substrates, high-temperature devices, etc. As the main representative of precision ceramic materials, it is widely used in industries such as semiconductors, petrochemicals, and electronics.
Advantages
1. we support OEM and ODM;
2. We have a professional R&D team and technical support;
3. We provide real-time logistics update information;
4. We support 24-hour online service;
5. We support T/T,L/c payment;
6. We have a professional QC team to check the quality before delivery.
Certificate
FAQ
1. How can you get quotation?
Please kindly send me your drawing with technic requirement and demand quantity.
If you don't have the drawing, please kindly courier samples to us. we will quote our best price in 24 hours.
2. How can you get samples?
We can supply free samples if we have them in stock. If we haven't produce the products, we can supply some free samples after getting tool fee. Please take note that the courier fee should be at destination.
3. What’s the lead-time for samples and batch orders?
It is 18days for supplying samples. It is around 25days for batch orders.
4. Can I visit you?
Sure. If you're a volume buyer and would like to visit our in-house products and production line, please contact us to make an appointment.
Alumina ceramic rod has excellent electrical insulation properties, which can effectively prevent current leakage. It is often used as a core material in resistors, which can reduce resistor noise and provide more stable resistance, enabling resistors to ensure high - power operation while achieving a higher integration density. The alumina ceramic rod is not a passive holder; it is an active, functional part of the resistor's design: Electrical Insulating Substrate: Its primary function is to provide a base that is an excellent electrical insulator. The resistive wire (e.g., Nichrome, Kanthal) is wound around this rod, and the alumina prevents the coils from shorting to each other or to any external ground. Mechanical Core: It provides the rigid structural backbone for the resistor, giving it mechanical strength and stability. It must resist bending, cracking, and vibration during operation. Heat Sink / Thermal Manager: This is a critical role. While the resistive wire heats up, the alumina rod absorbs that heat. Alumina has good thermal conductivity for a ceramic, which allows it to draw heat away from the wire, spread it along its length, and dissipate it into the surrounding air or to the resistor's outer casing. This prevents "hot spots" and allows the resistor to handle higher power levels.
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Common Resistor Types Using Steatite Cases steatite ceramics in these resistor types: Wirewound Resistors: Construction: A resistance wire (like Nichrome) is wound around a steatite ceramic rod or tube. The steatite body provides the core for winding. For higher power ratings, the assembly is often placed inside a larger steatite tube or case, with the space filled with a silicone cement for better heat transfer and environmental protection. Appearance: Typically a white, brown, or grayish cylindrical body with metal end caps and axial leads. Power Film Resistors: Similar to wirewound, but a resistive film is applied to a steatite rod instead of a wire. Cement Resistors: A specific type of wirewound resistor where the steatite case is packed with heat-conducting, non-flammable cement to enhance power rating and protect the element.
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2025-10-14
2025-10-14
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