Steel bonded dense silicon nitride compositions and method for their fabrication

Patent · Tue Nov 03 04:00:00 EST 1987

OSTI ID:5681899

Landingham, R L; Shell, T E

A multilayered composite is described comprising: a layer of high density, sintered silicon nitride; a layer of refractory material comprising a mixture of powdered nickel and molybdenum silicide; a layer of a brazing alloy; and a layer of metal, with the layer of brazing alloy sandwiched between the layer of metal and the layer of refractory material. This patent describes a silicon nitride rotor and steel shaft for a turbine or air compressor or diesel engine bonded together by the method comprising: (a) polishing a surface of a dense, sintered silicon nitride rotor to enhance wetting of the surface; (b) slurry coating and bonding to the surface of the silicon nitride rotor, a layer of a refractory material comprising a mixture of powdered nickel and molybdenum silicide; (c) grinding the layer of the refractory material to uniform thickness; (d) brazing the layer of the refractory material with a nickel-copper-silver or nickel-copper-manganese alloy at elevated temperatures; and (e) pressure bonding a steel shaft to the refractory material and the alloy.

• Assignee: Dept. of Energy, Washington, DC
• Patent Number(s): US 4704338
• OSTI ID: 5681899
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330102 -- Internal Combustion Engines-- Diesel
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALLOYS
BRAZING
BRAZING ALLOYS
CHEMICAL COMPOSITION
COATINGS
COMMINUTION
COMPOSITE MATERIALS
COMPRESSORS
DENSITY
DIESEL ENGINES
ENGINES
FABRICATION
GRINDING
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MACHINE PARTS
MACHINING
MATERIALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SILICIDES
NICKEL COMPOUNDS
NICKEL SILICIDES
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
POLISHING
REFRACTORIES
REFRACTORY METAL COMPOUNDS
ROTORS
SHAFTS
SILICIDES
SILICON COMPOUNDS
SILICON NITRIDES
SINTERING
STEELS
SURFACE FINISHING
TRANSITION ELEMENT COMPOUNDS
TURBINE BLADES
WELDING