China Ceramic Alumina Tube manufacturer

Al2O3 Metallized Ceramic Tube , Ceramic Vacuum Interrupter Large Diameter

Product Details:
Place of Origin: Hunan, China
Brand Name: Jinghui ceramics
Certification: RoHS, REACH, ISO
Model Number: JH.MCT.003
Payment & Shipping Terms:
Minimum Order Quantity: 10 Piece/Pieces
Price: Negotiable
Packaging Details: Vacuum packing with desiccant
Delivery Time: 4~5 weeks
Payment Terms: T/T, Western Union, MoneyGram, Paypal, , L/C
Supply Ability: 20000 Piece/Pieces per Month

Detail Information

Product Name: Metallized Ceramic Insulator For Vacuum Interrupter Material: Alumina Ceramic
Color: Pure White Shape: Ceramic Cylinder, Ceramic Tube
Size: Size Customized Type: Ceramic Parts
Metallization Type: Mo-Mn Metallization As Base Layer Outer Plating: Ni, Au, Ag Further Covering
Certificate: ISO9001:2008/SGS/ROHS Usage: Joint From Ceramic To Metal
High Light:

thermocouple protection tubes


ceramic vacuum interrupter

Product Description

Large Diameter Glazed 96% Al2O3 Alumina Ceramic Body for Vacuum Interrupter

Description of metallized ceramic tube:

In order to achieve the bonding between ceramic to ceramic, ceramic to metal parts, a thin layer of metal is applied to the ceramic parts' surface, then it can achieve the application. Currently, we are dealing with Molybedum-Maganese (Mo/Mn) and Tungsten (W) as typical metallization with veteran experience and abundant know-how.

Our factory focus on produce a variety of metallized ceramic components, including metallized ceramic tube, metallized ceramic bases, metallized ceramic spacer, metallized ceramic substrates and so on.


Specification of metallized ceramic tube: 

Material 96% alumina 99% alumina 99.5% alumina Zirconium oxide Beryllia oxide
Shaping methods Hot pressing Dry pressing ISO pressing
Dimensions OD up to φ300mm Length up to 500pcs
Nominal tolerance OD: ±0.10mm ID: ±0.20mm L: ±1mm    
Surface treatment External surface glazed Internal surface polished


Metallization types of alumina ceramic body

● 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


Prime characteristics of metallized ceramic tube:

1. Exceptional bonding/brazing strength up to 150MPa/mm2      2. Superb low leak rate below to ≤1×10-11 Pa•m3 / s

3. High mechanical strength up to 320MPa at least                    4. Electrical insulation strength up to 18KV. DC at least

5. Extremely anti-corrosion and free of rust forever                       6. Can work under high temperature up to 1450℃



High current/voltage 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 


Material Data. Sheet






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
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℃ ) >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



Other related metallized ceramic tubes

We could produce lots of different types of metallized ceramic cylinders for electron tubes, vacuum interrupters, vacuum breakers.Al2O3 Metallized Ceramic Tube , Ceramic Vacuum Interrupter Large Diameter 1 


Packaging proposal & Transportation methods


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 orders, we could ship it by sea as per customers' needs.

FAQs (Frequently Asked Questions)

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.

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