Alloy Information Report for Kovar™ A

Request for Quote

General Characteristics of Kovar™ A

A nickel-cobalt-iron alloy ideal for sealing into hard glass, Kovar A offers similar expansion curve as glass. Resists amalgamation with mercury as well as high thermal shock and creates strong metal-glass bond.

Chemical Composition of Kovar™ A

• Nickel 28.70-29.20
• Cobalt 17.30-17.80
• Manganese 0.50 max
• Silicon 0.20 max
• Carbon 0.06 max
• Iron 52.90-53.40

Heat Treatment of Kovar™ A

• Anneal 1292° to 2012° F (700° to 1100°C)
• Air anneal at temperatures less than 1652° F (900°C) after removing surface scale; avoid oxidation by hydrogen annealing

Applications of Kovar™ A

• Perfect when a vacuum-tight, metal-glass seals are required
• Grid-glow tube
• Ignitrons
• Rectifiers

Machinability of Kovar™ A

• Slow speeds and standard high-speed cutting tools
• Lard oil recommended for fine finish
• Grind high-speed, single-point turning tools to 6-8° side rake, 8-12° back rake, 5-8° side clearance, 7-10° front clearance, 10-15° cutting-edge angle, 10-15° lead angle
• 7-10° back rake, 5-8° side rake for cutoff blades
• Stone cutting edge post-grinding

Workability of Kovar™ A

• Easily hot or cold worked
• Deep draw maximum reductions:
  • 40% first draw
  • 25% first redraw
  • 30% after reanneal
  • 20% later redraws
  • 25% after reanneal
To Send a Request for Quote for Kovar™ A, please Click Here, or call 1.973.276.5000 or fax 1.973.276.5050.