Ceramic and Metal Brazed Assemblies

The brazing assemblies uses valveable materials or oxygen-free copper parts with a similar expansion coefficient to the ceramic parts and metallized ceramic parts to achieve sealing between the ceramic and the metal through brazing. The sealing parts can be argon arc welded with stainless steel, thereby Achieve air-tight connection between ceramic parts and metal structural parts.

Brazed Assemblies Company

Great Ceramic provides precision brazing of dissimilar materials such as metals and ceramics to create high-performance brazed assemblies. Skilled technicians and state-of-the-art facilities allow us to provide custom brazed parts for the most demanding applications.

Brazed Assemblies

Uses of brazed assemblies

Ceramic and metal brazing assemblies are mainly used in electron tubes, launch tubes, microwave tubes, traveling wave tubes, vacuum gauge tubes, accelerating tubes, trigger tubes, thyristors, X-ray tubes, CT tubes, high-voltage electrodes and other fields. Especially in the field of high-power, high-reliability packaged electronic products, it shows excellent performance.

Our Brazing Capabilities

– Vacuum and controlled atmosphere brazing up to 2200°F
– Resistance heating and induction brazing for rapid, localized heat
– Broad selection of active metal and silver-based filler metals
– Precise joint clearance control (±0.001”)
– Ultra-clean material preparation and handling
– Advanced inspection using scanning acoustic microscopy

Brazed Assemblies Technical Parameters

Project title Unit 96% Al2O3 97% Al2O3 99% Al2O3 99.6% Al2O3
Alumina content % Al2O3≧95% Al2O3≧97% Al2O3≧99% Al2O3≧99.6%
Size range mm 0.5-500 0.5-500 0.5-500 0.5-500
Highest accuracy mm 0.01 0.01 0.01 0.01
Bulk density g/cm3 ≧3.67 ≧3.70 ≧3.85 ≧3.90
Flexural strength MPa (25℃) ≧300 ≧300 ≧350 ≧400
Compressive strength GPa (25℃) ≧1.8 ≧1.8 ≧2.0 ≧2.3
Thermal conductivity W/m.K 10-20 10-20 15-21 15-21
Average linear expansion coefficient /℃ (20～500℃) 7.36×10-6 6.9×10-6 6.9×10-6 6.9×10-6
Dielectric constant 1MHz (20℃) 9.1 9.5 9.8 10
Dielectric loss tangent value 1MHz (20℃) ≦4×10-4 ≦3×10-4 ≦2×10-4 ≦2×10-4
Volume resistivity Ω.cm (100℃) ≧1×1014 ≧1×1014 ≧1×1014 ≧1×1014
DC breakdown strength KV/mm ≧30 ≧35 ≧25 ≧25
Thermal shock resistance ℃ 20~800 20~800 20~800 20~800
Maximum operating temperature ℃ ≦1300 ≦1400 ≦1500 ≦1500
Acid resistance General Suitable First-rate First-rate
Alkali resistance General Suitable Suitable First-rate
Ease of metallization Easy Normal difficulty Medium difficulty Very difficult
Air tightness Pa•m3/s ≦1×10-11 ≦1×10-11 ≦1×10-10 ≦1×10-9
Tension strength Kg/cm2 3 3 3 3

Note: Each batch may be different, for reference only.

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Metal and Ceramic Brazed Assemblies
Brazing Metals to Ceramics
Benefits of Metal and Ceramic Brazed Assemblies

Brazing Metals to Ceramics

Brazing provides a reliable process to join metals and ceramics in lightweight, high strength assemblies. We carefully select compatible materials and brazing filler metals to create tailored joints. Common material combinations include:

ceramics 95%Al2O3 97%Al2O3 Sapphire
Metal AgCu28 OFC Ag AuSn20 AgCu28 OFC Ag AuSn20 AgCu28 OFC Ag AuSn20
Kovar 4J33 √ √ √ √ √ √ √ √ √ √ √ √
Kovar 4J34 √ √ √ √ √ √ √ √ √ √ √ √
OF-Cu √ √ √ √ √ √ √ √ √
Au √ √ √ √ √ √ √ √ √
Au √ √ √ √ √ √ √ √ √ √ √ √

Learn about ceramic substrate metallization

Learn-about-ceramic-substrate-metallization

Learn about laser processing of ceramic substrates

Laser-processing-of-ceramic-substrates

Learn about aluminum nitride ceramic substrates

Aluminum-nitride-ceramic-substrate