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
Material Data. Sheet
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
Other related metallized Alumina Ceramics
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.
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 order, 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.
Jinghui Industry Ltd is a trusted and professional manufacturer of
technical ceramic components, we dedicated to developing,
manufacturing, sales, and service of a variety of industrial
ceramic parts over 15 years since its establishment in 2005.
The facility focus on producing metalized ceramics, pepper/spice
ceramic mechanisms, zirconia ceramic parts, thermostat ceramics,
ceramic seals and other plenty of electronic and industrial ceramic
parts in a selection of technical ceramic materials, such as
alumina, zirconia，Silicon carbide, Silicon nitride, and steatite
and so on. They are mainly used in electronic appliances,
equipment, and mechanical engineering, automotive industry, medical
technology, new energy and environmental protection, aerospace and
so on.
The enterprise acquired ISO9001: 2008 in 2009, all of us in Jinghui
persist the policy “No quality, No development", and it helped us
succeed in exporting to European, North America, Southeast Asia and
South America more than 50 countries through all Jinghui people's
effort, innovation, and initiative.
Many amazing solutions were to be supplied to our customers to
reach their ’toughest technical challenges. Our goal is to find a
better and optimal solution for all our customers from technology,
quality, cost control, and after-sales service, we are looking
forward to cooperating with you to create a totally new business in
your field.
