Metallized Ceramic Parts

Metallized ceramic parts are ceramic parts that have a thin layer of metal deposited onto their surface using various techniques such as sputtering, electroplating, or vapor deposition. The metal layer acts as a bonding interface between the ceramic part and the filler metal, allowing for a strong and reliable bond to form during the brazing process.

Ceramic Metallization Company

Metallized ceramic parts supplied by Great Ceramic are used to produce high-performance brazed assemblies for applications such as vacuum interrupters, speed control tubes and microwave tubes in the power electronics industry. In addition, we can customize high-quality metallized ceramic parts according to customer needs.

Metallized Ceramic Parts For Brazing

Ceramic Metals for Brazing

We apply thin metallization layers to ceramic parts like alumina, zirconia, and silicon carbide to promote wetting and bonding with brazing filler metals. Common metallization materials include:

  • Nickel – Diffuses well with silver-based braze alloys
  • Copper – Excellent wettability but requires plating with gold or nickel
  • Kovar or Invar – Alloys match ceramics’ CTEs to minimize residual stress
  • Tungsten or Moly-Manganese – Active metal brazes readily bond to these layers

Proper surface preparation ensures strong adhesion of the metallization layer to the ceramic. Our engineering experts work with you to select the best metallization materials and processes to achieve reliable, high-strength brazed joints, even with challenging geometries.

Metallization brings important advantages to ceramic brazing:

  • Permits dissimilar material joining with ceramics
  • Enables use of filler alloys that only wet to metals
  • Reduces brazing voids and cracks
  • Provides compliance to relieve residual stresses
  • Allows brazing of complex ceramic shapes
Surface metallized aluminum oxide parts
Metallized-Alumina-Ceramic-Parts
Alumina-ceramic-parts-metallization

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
Average Tension strength MPa 130 130 130 130

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

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