Cermet materials prepared by combustion synthesis and metal infiltration

Holt, Joseph B; Dunmead, Stephen D; Halverson, Danny C; Landingham, Richard L

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Title: Cermet materials prepared by combustion synthesis and metal infiltration

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Abstract

Ceramic-metal composites (cermets) are made by a combination of self-propagating high temperature combustion synthesis and molten metal infiltration. Solid-gas, solid-solid and solid-liquid reactions of a powder compact produce a porous ceramic body which is infiltrated by molten metal to produce a composite body of higher density. AlN-Al and many other materials can be produced.

Inventors:

Holt, Joseph B ^[1]; Dunmead, Stephen D ^[2]; Halverson, Danny C ^[3]; Landingham, Richard L ^[4]

San Jose, CA
Davis, CA
Modesto, CA
Livermore, CA

Issue Date:: 1991-01-01

Research Org.:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

OSTI Identifier:: 867688

Patent Number(s):: 4988645

Assignee:: United States of America as represented by United States (Washington, DC)

Patent Classifications (CPCs):: C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

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C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C04B2111/00913 - {as ceramic preforms for the fabrication of metal matrix comp, e.g. cermets}
C04B35/581 - based on aluminium nitride
C04B38/00 - Porous mortars, concrete, artificial stone or ceramic ware
C04B38/0025 - {starting from inorganic materials only, e.g. metal foam
C04B41/009 - {characterised by the material treated}
C04B41/5155 - {Aluminium}
C04B41/88 - Metals

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DOE Contract Number:: W-7405-ENG-48

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: cermet; materials; prepared; combustion; synthesis; metal; infiltration; ceramic-metal; composites; cermets; combination; self-propagating; temperature; molten; solid-gas; solid-solid; solid-liquid; reactions; powder; compact; produce; porous; ceramic; infiltrated; composite; density; aln-al; produced; powder compact; metal composites; temperature combustion; combustion synthesis; molten metal; porous ceramic; metal composite; metal infiltration; ceramic-metal composite; ceramic-metal composites; materials prepared; cermet material; /501/

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                    Holt, Joseph B, Dunmead, Stephen D, Halverson, Danny C, and Landingham, Richard L. Cermet materials prepared by combustion synthesis and metal infiltration.  United States: N. p., 1991. 
        Web.

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                    Holt, Joseph B, Dunmead, Stephen D, Halverson, Danny C, & Landingham, Richard L. Cermet materials prepared by combustion synthesis and metal infiltration.  United States.

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                    Holt, Joseph B, Dunmead, Stephen D, Halverson, Danny C, and Landingham, Richard L. Tue .  
        "Cermet materials prepared by combustion synthesis and metal infiltration".  United States.  https://www.osti.gov/servlets/purl/867688.

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@article{osti_867688,

  title        = {Cermet materials prepared by combustion synthesis and metal infiltration},

  author       = {Holt, Joseph B and Dunmead, Stephen D and Halverson, Danny C and Landingham, Richard L},

  abstractNote = {Ceramic-metal composites (cermets) are made by a combination of self-propagating high temperature combustion synthesis and molten metal infiltration. Solid-gas, solid-solid and solid-liquid reactions of a powder compact produce a porous ceramic body which is infiltrated by molten metal to produce a composite body of higher density. AlN-Al and many other materials can be produced.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1991},

  month        = {1}

}

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Cermet materials prepared by combustion synthesis and metal infiltration

Patent Holt, J B; Dunmead, S D; Halverson, D C; ...

Ceramic-metal composites (cermets) are made by a combination of self-propagating high temperature combustion synthesis and molten metal infiltration. Solid-gas, solid-solid and solid-liquid reactions of a powder compact produce a porous ceramic body which is infiltrated by molten metal to produce a composite body of higher density. AlN-Al and many other materials can be produced. 6 figures.
Infiltration processing of boron carbide-, boron-, and boride-reactive metal cermets

Patent Halverson, Danny C [Manteca, CA]; Landingham, Richard L [Livermore, CA]

A chemical pretreatment method is used to produce boron carbide-, boron-, and boride-reactive metal composites by an infiltration process. The boron carbide or other starting constituents, in powder form, are immersed in various alcohols, or other chemical agents, to change the surface chemistry of the starting constituents. The chemically treated starting constituents are consolidated into a porous ceramic precursor which is then infiltrated by molten aluminum or other metal by heating to wetting conditions. Chemical treatment of the starting constituents allows infiltration to full density. The infiltrated precursor is further heat treated to produce a tailorable microstructure. The process atmore » « less
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Cermets from molten metal infiltration processing

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New cermets with improved properties and applications are provided. These new cermets have lower density and/or higher hardness than B4C cermet. By incorporating other new ceramics into B4C powders or as a substitute for B4C, lower densities and/or higher hardness cermets result. The ceramic powders have much finer particle size than those previously used which significantly reduces grain size of the cermet microstructure and improves the cermet properties.
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Cermets from molten metal infiltration processing

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New cermets with improved properties and applications are provided. These new cermets have lower density and/or higher hardness than B4C cermet. By incorporating other new ceramics into B4C powders or as a substitute for B4C, lower densities and/or higher hardness cermets result. The ceramic powders have much finer particle size than those previously used which significantly reduces grain size of the cermet microstructure and improves the cermet properties.
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Grained composite materials prepared by combustion synthesis under mechanical pressure

Patent Dunmead, Stephen D [Davis, CA]; Holt, Joseph B [San Jose, CA]; Kingman, Donald D [Danville, CA]; ...

Dense, finely grained composite materials comprising one or more ceramic phase or phase and one or more metallic and/or intermetallic phase or phases are produced by combustion synthesis. Spherical ceramic grains are homogeneously dispersed within the matrix. Methods are provided, which include the step of applying mechanical pressure during or immediately after ignition, by which the microstructures in the resulting composites can be controllably selected.
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