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Title: Steel bonded dense silicon nitride compositions and method for their fabrication

Abstract

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.

Inventors:
;
Publication Date:
OSTI Identifier:
5681899
Patent Number(s):
US 4704338
Application Number:
TRN: 88-002843
Assignee:
Dept. of Energy, Washington, DC
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 20 Nov 1986
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 33 ADVANCED PROPULSION SYSTEMS; ROTORS; FABRICATION; SILICON NITRIDES; BRAZING; BRAZING ALLOYS; CHEMICAL COMPOSITION; COATINGS; COMPOSITE MATERIALS; COMPRESSORS; DENSITY; DIESEL ENGINES; GRINDING; MOLYBDENUM SILICIDES; NICKEL SILICIDES; POLISHING; REFRACTORIES; SHAFTS; SINTERING; STEELS; TURBINE BLADES; ALLOYS; COMMINUTION; ENGINES; HEAT ENGINES; INTERNAL COMBUSTION ENGINES; IRON ALLOYS; IRON BASE ALLOYS; JOINING; MACHINE PARTS; MACHINING; MATERIALS; MOLYBDENUM COMPOUNDS; NICKEL COMPOUNDS; NITRIDES; NITROGEN COMPOUNDS; PHYSICAL PROPERTIES; PNICTIDES; REFRACTORY METAL COMPOUNDS; SILICIDES; SILICON COMPOUNDS; SURFACE FINISHING; TRANSITION ELEMENT COMPOUNDS; WELDING; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 330102 - Internal Combustion Engines- Diesel

Citation Formats

Landingham, R L, and Shell, T E. Steel bonded dense silicon nitride compositions and method for their fabrication. United States: N. p., 1987. Web.
Landingham, R L, & Shell, T E. Steel bonded dense silicon nitride compositions and method for their fabrication. United States.
Landingham, R L, and Shell, T E. Tue . "Steel bonded dense silicon nitride compositions and method for their fabrication". United States.
@article{osti_5681899,
title = {Steel bonded dense silicon nitride compositions and method for their fabrication},
author = {Landingham, R L and Shell, T E},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {11}
}