Analysis of gas atomisation

shown

ro depend

on sub-grain

tures. Interaction

between

recrystallisation 0

content

in commercial

purity

in recrystallised

grain-boundary-specific in H was effective

compounds

,and grain snuc-

0 and defects delays MO. The

MO depended

dispersed

Al,O,.

on composition

Properties

new technology of Cu powder

and consolidation

rhe 0 content.

Improvements in bonding of press-ready low alloy steel powder mixtures

of oxide,dispersion

Y203

were considered

sants.

Structural

mechanical hot pressing gave

compounds,

such

as Mgl7La2,

have

conditions

limit

properties

can

alloying

for which

tigated.

Mechanically

milled

It is shown

improved various

by

orption found

properties. to absorb

and

that

these

were invesMg17Laz

Mg,7La,-30wt%NiSLa

was

of which

3.3%

should

be

studies

were

ducibility

considered.

factors applied

to grain

alloying

of materials.

to 9.85wt%N and

Cr-Ni

solved

elemental

It was noted

also absorb

N. Much

loss was reduced addition

by increase

of Mn or Nb.

spark plasma

up

Cr-Mn

of the

dis-

processing.

N

in Cr content

or

Consolidation

on

powder

alloyed

acterized

by X-ray

gradually

taken

Consolidated

alloys

tion,

and

40

and

elemental

Nb,Al

MPR

there

Mechanical ered

and

which perature

were

V and Al were solid

NbzAl

September

solution.

Nb solid solu-

base

intermetallic

2002

based

of metal)

ratio

G .P.Cammurota, A.Catagrande. Bologna, Italy.) investigation

shape

NiAl-SiC

parts,

by

reactive

of

of

Grain

refinement

ness.

The

were consid-

hard-

of

ceramic

raised

from 300 to 750.

of aluminium

It was noted

that

AlN is difficult

tion of AlN synthesis

direct

Chemical

were made.

process

was

outlined. efficiency

and

of

Design details

copper powder

moulding

was noted.

parameters materials

Advantages

Ecological degreasing metallurgy

The of the tech-

in powder

J.A.Bas et al. (AMES SA. Barcelona, Spam.) oils and

organic

substances,

machining

from PM parts was emphasised.

Powder-Technology. of fine parti-

and applications

It was reported

were

used AI-C-

were outlined.

The need to remove

The need for new Cu powders

the

was described.

Al-NH,-(NH&AlF,.

was modelled.

as quenching

GmbH

. N sat-

between

Sintering

furnace

recovery

thermal

for the precursor

N-FeO(OH)

large-scale

operating

and

of high

by an Al matrix

of Al and AlN

atomisation

cle size for injection

synthesis

and costly. An investiga-

points

in melting

nitride

R.Pnlmer et al. (Birkbeck College, London, UK.)

melting

to increase

R.Hiinert. (MicroMet Humburg, Germq.)

the

from

in ‘downtime’,

of Fe.

to reduce

of effects of melt tem-

was discussed,

to 637°C.

with addition

was found

presence

hardness

elemental described.

at 617°C

at temperatures

used inert gas and rapid melting.

in electronics

was

composite

from was

were made

Direct synthesis

purity

discussed.

were presented.

Sub-micron

synthesis

synthesis

of near-net

NiAI-Al,O,

process

as increase

die mix-

(University of Bolog~,

powders

samples

nique

reduction

powder

of production and

Some

Vicker’s

A dimen-

was

Advantages of innovative metal powder production

gas

and conventional

uration

and gas properties

gives

and better

and

on (volume

energies

a mechanism

bonding

para-

evaluation

was presented. ratio,

some predictions

are bonded

Efficient

Reactive sintering of nickel aluminide-(alumina or silicon carbide) composite materials

analysed

capacity,

char-

Nb

and material size to process

and thermal

that

Reactive synthesis of PM materials

Reactive

An

particle

constituents

less “dusting”

metal-ceramic

is little understand-

atomising.

gas:metal

were described

mixtures

contained

gas

It was shown

can be met by use of bond-

in which

Bonded

An

in mechanical

Developments

Nb-ZO%V-

diffraction.

model was

of

and the products

into

A comparison

S.Pkier, M.Hohmann. (ALD Vncuum Technologies AG, Hanau, Gerr~ny.)

S.Dymrc et al. (Academy of Minrng and Metallurgy, Krakow, Poland.) 15%Al

that

linking

gas):(volume

Inert

Processing and microstructure mechanically alloyed niobiumvanadium-aluminium

mechanically

repro-

was by

sintering.

Nb-24at%V-18%Al

and

of key and scale

size control

conditions

sionless

Fe stainless

alloying.

N was lost in subsequent

Differences

J.J.J)unkley. (Atomisinl: Systems Ltd., Sheffield, LK.)

material

could be made to absorb

by mechanical

and

of gas atomisation

equations

(College of Industrial Technology,

steel type materials

Collision

dlscussed Effects

with refin particu-

Powder production

meters

that

alloying

considered.

were outlined.

was discussed.

lower segregation, filling.

to make parts

to close dimensional

tures were compared.

is transferred.

between

properties

to Fe or steel powders.

powders

was reviewed

attrition

tolerances ed powders,

a significant

of the process,

ing of the effects of process

Nitrogen behaviour and hot compaction of high nitrogen stainless steels Hyogo, Jopan.) It was reported

alloying

energy

Analysis

temperature.

H.Miuru, H.Ogarua.

during

Uniaxial

was

absorption/des-

up to 4.4wt%H

was at ambient

and

for new powders

improved

these requirements

mechanical

methods alloyed

with NiSLa to improve

time

alloyed

of mechanical

to modelling

lar how

Mg inter-

to store H but some properties be

and

in 0.2% proof stress.

Mechanical erence

Manufacturing

high ability

usage.

with

1.1 .Sunol. (University of Girom, Gironn. Spain.)

Synthesis of magnesium-lanthanum powders for hydrogen storage applications

metallic

with

up to 97%

Modelling

Mechanical alloying

Ce02

was investigated.

of mechanically

densities

increase

properties.

U.Eng.rtrbm et al (HizigamisAB, Hdgan&, Sweden.) The demand

to mechan-

to be the best disper-

evolution

alloying

strength-

with regard

ical, creep and electrical

Mg and some

used to

Mechanical alloying of oxidedispersion strengthened copper

ened Cu was discussed

that

been

satisfy this demand.

Manufacture

It was noted

precipitation

had

temperature.

LJ.M&n et nl. (University of Mining and TechnoJoRy, Fyeiburg, Gel-many.)

J.Keskinen, S.-J’. Hnnnula.(VTT Techno&?, Tamp~e, Finkmd.)

of wet chemical for solutions

on

surface area. Annealing in lowering

and

depended

that a

such as C,HCl,

was dIscussed

environmental

considerations.

tive degreasing tam solutions major reduction

methods,

Use of solvents with reference Some

including

and ultrasonics

such

lubricants,

water-surfac-

were outlined.

in use of C,HCl,

to

altemaA

was reported.

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