Class   419	POWDER METALLURGY PROCESSES
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POWDER METALLURGY PROCESSES WITH HEATING OR SINTERING

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. (1 indent ) Making porous product

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. (1 indent ) Making articles of indefinite length

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.. (2 indent ) Filaments or fibers

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. (1 indent ) Making composite or hollow article

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.. (2 indent ) Powder next to powder

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... (3 indent ) One or more components not compacted

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.. (2 indent ) Powder next to solid

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... (3 indent ) Powder not compacted

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. (1 indent ) Metal and nonmetal in final product

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.. (2 indent ) Nonmetal is elemental carbon

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.. (2 indent ) Boride containing

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.. (2 indent ) Nitride containing

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.. (2 indent ) Carbide containing

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... (3 indent ) Complex or multiple carbides

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.... (4 indent ) With another binary nonmetal

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... (3 indent ) Single carbide

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.... (4 indent ) Tungsten carbide

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.. (2 indent ) Oxide containing

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... (3 indent ) Rare earth oxide

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... (3 indent ) Silver metal with metal oxide

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... (3 indent ) Copper oxide

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. (1 indent ) Powder shape or size characteristics

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.. (2 indent ) Filaments or fibers

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. (1 indent ) Controlled cooling after sintering

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. (1 indent ) Post sintering operation

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.. (2 indent ) Impregnation

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.. (2 indent ) Subsequent working

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.. (2 indent ) Subsequent heat treatment (e.g., annealing, etc.)

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. (1 indent ) Powder pretreatment (prior to consolidation or sintering)

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.. (2 indent ) Heat treatment of powder

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.. (2 indent ) Mechanical blending

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.. (2 indent ) Comminuting

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.. (2 indent ) Chemical blending

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.. (2 indent ) Coating

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.. (2 indent ) Addition of fugitive material

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... (3 indent ) Additional material is solid

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. (1 indent ) Consolidation of powder prior to sintering

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.. (2 indent ) Specific pressure or lack or pressure recited

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... (3 indent ) Slip or slurry

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.. (2 indent ) Extruding

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.. (2 indent ) Isostatic or Hydrostatic

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.. (2 indent ) Rolling

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. (1 indent ) Pretreatment of consolidated powders

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. (1 indent ) Sintering which includes a chemical reaction

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. (1 indent ) Alloying occurs during sintering

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. (1 indent ) Liquid phase sintering

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. (1 indent ) Heat and pressure simultaneously to effect sintering

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.. (2 indent ) Hot isostatic pressing (HIP)

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.. (2 indent ) Hot rolling

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.. (2 indent ) Multiaxial (Not HIP)

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.. (2 indent ) Heating by electrical means other than radiant energy

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. (1 indent ) Plural heating steps including sintering

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.. (2 indent ) Different temperatures

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.. (2 indent ) Additional operation between heating steps

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. (1 indent ) Special medium during sintering

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.. (2 indent ) Special atmosphere

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... (3 indent ) Hydrogen or hydrogen plus nitrogen (Nitrogen per se in 57)

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... (3 indent ) Hydrocarbon or derivative (e.g., CH4, etc.)

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... (3 indent ) Vacuum

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FORMING ARTICLES BY UNITING RANDOMLY ASSOCIATED METAL PARTICLES

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. (1 indent ) Powder pretreatment

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.. (2 indent ) Includes a chemical reaction

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.. (2 indent ) Includes coating of particles

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.. (2 indent ) Includes adding a binder material

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. (1 indent ) Consolidation of powders

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.. (2 indent ) Extrusion

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.. (2 indent ) Isostatic/Hydrostatic pressing

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.. (2 indent ) Rolling

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