High strength sintered aluminium alloys

A statistical analysis each binder component carbonyl A range studied reported

of the influence on the flow

It was reported that self-propagating synthesis had been used to prepare Fe and Ni base powders with up to 75%TiC particles, 2 to 10 pm in size. The TIC particles are coated with metal. These powders can be used to make Fe or stainless steel matrix composites by conventional pressing and sintering.

of of

Fe MIM feedstocks is described. of binder compositions were by capillary viscometry. It is that increase in binder content

increased constituents

flow of increased

feedstock. flow rates

Binder in the

order polyethylene resin, polyethylene wax and stearic acid. Great,est, flowability was found in binders with polyethylene resin.

Liquid phase sin tering models

Mechanical properties

MODIFICATION OF PARTICLE CONTACTS IN COPPER ALLOY

components

PM

MANUFACTURE

CHANGE B.F.Kieback

OFCLADPRODUCTS

et al. (Osprey

Metals

Ltd, Neath,

ht. J Puwder Metall., Vol 33, No 3,

IJK.)

1997, 21-29. Use of spray

forming

to

deposit

claddings on parts is discussed reference to the integrity of the between coating and substrate. In the of rolls, poor bonding has meant that formed parts are fitted to the rolls. reported that direct spray cladding

with bond case spray It is onto

steel is feasible. Equipment and deposition method are described. Structure and properties are presented and a comparison is made with conventional rolls.

porosities

were

powders

made

by HIP, with

phase. Particle chemistry were reported

that

LJniversity,

materials

with

from and

varying

spherical

without

liquid

contact geometry investigated. It.

properties

varied

ductility

with

open

process

variables

requirements

porosity and

and was

even

at

that

it and

the same porosities. It was shown is possible to combine strength

by control

t,o link

of

this

with

of applications.

Wear resistant composites

carbide

POWDER lAr SITU IRON

DENSIFICATION HIGH

STRATEGIES

ENDURANCE

FOR

TITANIUM

CARBIDE

et al. (Stackpole

Int. ./. Powder Metall., Vol 33, No

Canada.)

3, 1997, 37-43. 1Jse of PM powertrains present noted

Ltd, .Mississauga,

that

future

in

on

automotive

with

high

is

the ability to satis& the currently met by cast!

density

is placed on densities and

process

will be able

to make every part,

leading

range

for densification

of strategies

keep costs

to It

to the need for a and

processing

to

low.

Fe-Tic

and

formed

OF IS014000

a

1997, 46-49. Evolution of International Standards is outlined with particular reference to ISO9000, and more recently ISO14000,

with

Standards Attention ISO14004.

for Quality Management. is drawn to IS014001 and The implications of these

CONTAINING WEAR

standards,

now

J.V.Wood

PM industry, 40

Evolution

deformation

1997

and

temperature

OF HIGH

and of

fracture

multi-phase were

variations

in

characteristics

were discussed.

DEVELOPMENT RESISTANT

FOR

APPLICATIONS

et al. (University LTK.)

CARBIDE

alloys

reference to 2000 (AL-Cu), and 7000 (Al-Zn-Mg-Cu)

6000 (AL-Mg-Si) series alloys,

sintering and heat treatment, and series alloy with a tensile strength hlPa and

a 7000 of 450

5% elongation.

DYNAMIC BEHAVIOUR OF A PM POROUS 316L STAINLESS STEEL B.Karlson.

(Chalmers

Univer-

was investigated. Peak stresses in low cycle fatigue, for both densities, were related by a constant factor irrespective of number of cycles and strain amplitude. Surface and internal cracks were detected. Models for surface crack length and crack density were suggested. Surface crack initiation and path for later

growth

were discussed.

Powder characterization DYNAMIC

MODEL

VELOCITY

IN FRIABILITY

FOR IMPACT TESTING

P.D.Funkerbusch.

(University

of friability

testing

trace movement of the ball into the vial with time. The velocity change on impact increased with increase in vial length and coefficient of restitution in steady state, is reached

rapidly.

MICROSTRUCTURE

OF POWDERS TITANIUM

that

manufacture

was described. The objectives were to characterize the test and to determine values related to powder properties. The simulation was said to improve test methodology. The model was intended to

Russia.)

materials

the maxim for both

and use had not been applied in the case of sintered Al alloys. This was discussed with

which

Nottingham,

is discussed.

MPR November

for the

single

that

he designed

of Rochester, USA.) A model for dynamics

with temperature

cermet

of Queens-

with

MATERIALS

of SIA, ‘Lutch’,

of

and

It was stated should

T.Takahashi,

in properties

W.B.Ericson. (Kennametal Inc, Latrobe, USA.) Int. J. Powder Metal/., Vol 33, No 3,

future,

material

CERAMIC

(Inst.

outlined,

in the

and product

range

ceramic

and

The

to allow control

AND FRACTURE

Variations for

of

P? sitar were compared.

TEMPERATURE

PM INDUSTRY

resistances

with

was shown

(University

of were

properties.

STRENGTH

FOR THE

Effects

conditions wear

were

PM and PM material

of microstructure

A.G.Lanin. IMPLICATIONS

Fe

(Fe,Cr)C

processing.

The abrasive

technique

situ

investigation

process

ingot, conventional carbides

carbides

PM can use

TIC and

during

discussed.

other

with Cr, Ti and graphite

pressed.

synthesized

superior

Quality assurance and control

In the

was mixed

hot

ingot.

was described.

solidification.

composition

in

of PM and

TiC and

during

mixtures.

powder and

study

of Mines. LISA.)

Fe-TIC composites

arc formed

in the use of PM parts

wrought materials. Emphasis the need for parts with higher no single

regard

developments.

increase

will depend specifications

A comparative metallurg In melt

parts

is discussed and

MATRIX-

COMPOSITES

catal. (US Bureau

S.Huo.

Australia.)

sity of Technology, Sweden.) A study of mechanical behaviour of sintered 316L stainless steel, made from water atomized powder, at densities of 6.7 Response to and 7.2 g.cm~“, was described. cyclic deformation and evolution of cracks

PM COMPONENTS .J.A.Hawk

P.Jones

land,

SINTERED

ALLOYS

G.B.Schaffer,

IJ.Lindstedt,

WEARRESISTANT PROCESSED

STRENGTH

ALUMINIUM

VARIABLES

rt al. (Technological

Dresden, Germany.) Porous Cu base

BY SPRAY FORMING J.Forrest

OF PROCESS

HIGH

BY

of Nottingham,

CHARACTERIZATION ALLOYED GL’Esperance de Montreal,

OF PARTIALLY

POWDERS et al. (Ecole Canada.)

Polytechnique