IPC 7 English version B22F !A-B22F 9/30

B22F-B22F00930

SECTION B – PERFORMING OPERATIONS; TRANSPORTING

B 22

CASTING; POWDER METALLURGY

B 22 F

WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (processes or devices for granulating materials in general B01J 2/00; making ceramics by compacting or sintering C04B, e.g. C04B 35/64; for the production of metals as such, see class C22; reduction or decomposition of metal compounds in general C22B; making alloys by powder metallurgy C22C; electrolytic production of metal powder C25C 5/00)

Notes

(1)

This subclass covers the making of metallic powder only insofar as powder with specific physical characteristics is made. [6]

(2)

In this subclass, the following terms or expressions are used with the meanings indicated:

–

"metallic powder" covers powders containing a substantial proportion of non-metallic material;

–

"powder" includes somewhat larger particles which are worked, obtained or behave in a manner similar to powder, e.g. fibres.

Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition (C04, C08 take precedence)

comprising coating of the powder [2]

Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor

Compacting only

Press-moulding apparatus therefor [6]

035

with one or more of the parts thereof being pivotally mounted [6]

by applying fluid pressure

by centrifugal forces

by explosive forces

087

using high energy impulses, e.g. magnetic field impulses [6]

093

using vibration [6]

Sintering only

105

by using electric current, laser radiation or plasma (B22F 3/11 takes precedence) [6]

Making porous workpieces or articles [6]

115

by spraying molten metal, i.e. spray sintering, spray casting [6]

Both compacting and sintering (by forging B22F 3/17) [6]

simultaneously

Hot isostatic pressing [6]

in successive or repeated steps

by forging [6]

by using pressure rollers [6]

by extruding

for producing castings from a slip

involving a self-propagating high-temperature synthesis or reaction sintering step [6]

After-treatment of workpieces or articles

Impregnating

Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product

of piston rings

of turbine blades

of threaded articles, e.g. nuts

of toothed articles, e.g. gear wheels; of cam discs

of articles with cavities or holes, not otherwise provided for in the preceding subgroups [6]

of tubes or wires [6]

Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting

of composite layers

with one or more layers not made from powder, e.g. made from solid metal

of composite workpieces or articles from parts, e.g. to form tipped tools

with one or more parts not made from powder

Manufacture of articles from scrap or waste metal particles [6]

Making metallic powder or suspensions thereof

using physical processes [3]

starting from solid material, e.g. by crushing, grinding or milling (crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C) [3]

starting from liquid material [3]

by casting, e.g. through sieves or in water, by atomising or spraying (using electric discharge B22F 9/14) [3]

using centrifugal force [3]

starting from gaseous material [3]

using electric discharge [3]

using chemical processes [3]

with reduction of metal compounds [3]

starting from solid metal compounds [3]

using gaseous reductors [3]

starting from liquid metal compounds, e.g. solutions [3]

using gaseous reductors [3]

starting from gaseous metal compounds [3]

with decomposition of metal compounds, e.g. by pyrolysis [3]