Jinghui Industry Limited
Jinghui Industry Limited
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Refractory Metallization of Alumina Ceramics for Electrical Engineering
Ceramic to metal bonding was a big problem at the practical application over years because of different thermal expansion coefficient between both types of materials. In order to fix the problems, a thin layer of metal deposited on the ceramic components surface enables brazing to a metal part. In common cases, it referred to " metallized ceramics" or " Ceramic metallization". The prime types of metallization we covered are Molybedum and Tungsten, also we provide another special in-house metallization formula.
We supply a number of many custom refractory metallized alumina ceramics for use in gas discharge tubes, high current feedthrus, x-ray tubes, and similar applications where ceramic-to-metal, ceramic to ceramic seal joints of superb bonding strength and hermeticity are required.
specializes in molybdenum/tungsten thick film metallization on 95% alumina ceramics. Also, we metallized high purity alumina, like 99% alumina, zirconia, and beryllia. We utilize electro or electroless nickel/silver/gold plating as the preferred deposition over metallization. The result in a system easily brazed with copper-silver, pure copper, gold and other common braze alloys.
Metallization types:
● Ceramic body + Silver (Ag) plating
● Ceramic body + Molybdenum-Manganese ( Mo-Mn) metallization
● Ceramic body + Molybdenum-Manganese ( Mo-Mn) metallization + Nickle ( Ni ) plating
● Ceramic body + Tungsten ( W ) metallization + Gold ( Au ) plating
Special types are available according to customer's drawings or samples
Main characteristics of Metallized ceramic isolator
● Min. electric resistance and vacuum tightness, and less than 1×10-11 Pa•m3 / s
● High bonding/brazing strength, It can be up to 150 MPa after brazing
● High mechanical strength, flexural strength can be up to 338 MPa
● High insulation, anti-chemical and anti-aging. It will be free of rust forever
Applications:
Vacuum interrupters, Vacuum circuit breakers, Feed-through insulators, Headers, High-power receptacles, Insulating discs, Insulator rings and cylinders, Precipitator products, Power switches, Traveling wave tubes, Windows, Power grid tubes, X-ray tubes
| General | Property | Units | 99%Al2O3 | 95%Al2O3 | ZrO2 |
| Mechanical | Density | g/cm3 | ≥3.80 | ≥3.60 | ≥6.0 |
| Water absorption | % | 0 | 0 | 0 | |
| Hardness | HV | 1700 | 1500 | 1300 | |
| Flexural strength | Mpa | ≥338 | ≥320 | ≥1200 | |
| Compressive strength | Mpa | ≥2240 | ≥2000 | ≥1990 | |
| Fracture toughness | Mpa m 1/2 | 4-5 | 3-4 | 6.5-8 | |
| Thermal | Max. service temperature (Non-loading) | ℃ | 1600 | 1450 | 1000 |
| CTE (20-800℃) | 1×10 -6 /℃ | 6.2~8.0 | 5.0~8.0 | 8.0~9.5 | |
| Thermal shock | T(℃) | ≥200 | ≥220 | ≥300 | |
| Thermal conductivity (25℃ ) | W/m.k | 29 | 24 | 3 | |
| Specific heat | 1 x 10 3 J/(kg·K) | 0.78 | 0.78 | 0.46 | |
| Electrical | Volume resistivity (25℃ ) | ohm.cm | ＞1 x 10 14 | ＞1 x 10 14 | ＞1 x 10 11 |
| Insulation strength | KV/mm | 18 | 18 | 17 | |
| Dielectric constant (1Mhz) | (E) | 9.5 | 9.5 | 29 |
We also produce lots of different types of metallized alumina ceramic parts, including ceramic cylinders for electron tubes, vacuum interrupters, vacuum breakers, ceramic insulators for gas discharge tubes and so on.
1. Vacuum packing with desiccant as an inner package;
2. Then, exported carton as an outer package.
3. Finally, it will be packed with a wooden case if needed.
4. We regularly use DHL, UPS, FedEx, and TNT to ship small parcels.
5. For large volume order, we could ship it by sea as per customers' needs.
Q1: Is it available to produce customized products?
A: We always support custom-made metallic coated ceramic insulators as per different dimensions, designs, metallization, and platings.
Q2. When can I get the price?
A: We regularly quote within 24 hours after we get your inquiry. If you are in urgent need of getting the price, please call us or tell us in your email so that we will proceed with your inquiry as a priority.
Q3. How long can I expect to get the sample?
A: After you pay the sample charge and send us confirmed files, the samples will be ready for delivery in 4 weeks. The samples will be sent to you via express and arrive in 3-5 workdays. You can use your own express account or prepay us if you do not have an account.
Q4. How long does the whole procedure being worked out?
A: After you place an order, the manufacturing time is about 25 working days.
Q5. How to ensure quality?
A: The dimension out of any batch will be carried out sampling inspection per International AQL standard. A 100% cosmetic inspection will be done.
Q6. Are you a factory or trading company?
A: We are a professional manufacturer. We are warmly welcome clients from worldwide to visit our factory and cooperate with us.