Steel bonded dense silicon nitride compositions and method for their fabrication

Patent · Wed Dec 31 23:00:00 EST 1986

OSTI ID:866408

Landingham, Richard L ^[1]; Shell, Thomas E ^[2]

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1. Livermore, CA
2. Tracy, CA

A two-stage bonding technique for bonding high density silicon nitride and other ceramic materials to stainless steel and other hard metals, and multilayered ceramic-metal composites prepared by the technique are disclosed. The technique involves initially slurry coating a surface of the ceramic material at about 1500.degree. C. in a vacuum with a refractory material and the stainless steel is then pressure bonded to the metallic coated surface by brazing it with nickel-copper-silver or nickel-copper-manganese alloys at a temperature in the range of about 850.degree. to 950.degree. C. in a vacuum. The two-stage bonding technique minimizes the temperature-expansion mismatch between the dissimilar materials.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4704338
• OSTI ID: 866408
• Country of Publication: United States
• Language: English

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1500
850
950
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brazing
ceramic
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ceramic material
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ceramic-metal
ceramic-metal composite
ceramic-metal composites
coated
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degree
dense
dense silicon
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density silicon
disclosed
dissimilar
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fabrication
hard
hard metal
hard metals
initially
involves
involves initially
material
materials
metal composite
metal composites
metallic
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method
minimizes
mismatch
multilayered
multilayered ceramic-metal
nickel-copper-manganese
nickel-copper-silver
nitride
nitride compositions
prepared
pressure
range
refractory
refractory material
silicon
silicon nitride
similar material
similar materials
slurry
slurry coating
stainless
stainless steel
steel
steel bonded
surface
technique
technique involves
temperature
temperature-expansion
two-stage
two-stage bonding
vacuum