Rodar™

General Characteristics of Rodar™

Rodar™ is an alloy used for sealing into glass, with an expansion curve comparable to glass. It’s an iron, cobalt, nickel alloy that firmly bonds metal and glass, resists thermal shock and is easy to machine.

Chemical Composition of Rodar™

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

Heat Treatment of Rodar™

• Anneal from 1292° to 2012°F (700° to 1100°C)
• Achieve near softening by annealing at 1472°F (800°C) for 30 minutes following cold reduction
• Avoid oxidation by hydrogen annealing

Applications of Rodar™

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

Machinability of Rodar™

• 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 Rodar™

• Easily hot or cold worked
• Deep draw maximum reductions:
  • 40% first draw
  • 25% first redraw
  • 30% after reanneal
  • 20% later redraws
  • 25% after reanneal

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