The puzzle of warm compaction's cool reception

The puzzle of cool reception should

Dear Editor: I

had

listening of

the to

the

pleasure

the

introduction

Ancordense

powder

the

to

be

I think is likely

a major

development,

opening

new

markets

opportunities

dustry. The warm

PM in-

tion should same

compaction

importance

about

as metal injection puzzled

by the

Dr Joseph David end

last

in

year,

Dr

MPR’s

that

the

of the warm compac-

concept

warm

of

and

in two issues at the

reception tion

comments

Whittaker of

highly

M. Capus

Viewpoint

such

moulding.

therefore

was

in

only

Europe,

enthusiastic

lukewhile proas it

the

same

costs

ing

Viewpoint

decided of

this

discrepancy

Europe

some

manufacturers

cess,

The

producers

gle pressing 150 C)

and

112O’C

or

gives

an

140.

sintering

(at

higher)

This

attractive in both

provement strength

(at about

and

about

tensile

are

the

several

of them

actual

part

industrial

are studying

production

My conclusion discrepancy America

in

and

double

pressing/double

should

to:

Metal Powder report P.O. Box 160 Kidlington

by

sinter

Oxford

by warm

OX5 1AS

I JK.

in interest

reactions,

improved

Europe.

green strength,

which

ble

SINTERING

FURNACE

or SINTER-HIP

FURNACE

of

by differ

in the

for processing

of hardmetal

products

new

I think that the by and

large, were

in North America However, route

sintering

is used

decrease

the risk of

formation

at press-

more in North America

handling.

Europe,

North

and

as the dou-

pressing/double

process

VACUUM

process

can not be explained

subst,antially

pressed condition; more even density distribution of the as-pressed and as-sintered parts. This

in

encoun

at the presentations

similar

to be machined by milling, turning, drilling and threading in the as-

under

reactions

Europe

technologv.

The improved green strength will enable parts

be addressed The editor

is that the

for defect

or

produced

likely

Correspondence

of

high

conditions.

difficult

ejection

will more

of

density 7.2 g/cm”)

which or

be

part

be

to

been

the

tive

ing,

will

is given

type written letters.

I

and

formation

crack

substantial

volume

Preference concise,

compaction.

of

ences

also

volume by year

performance/high parts (more than

ing

process

the risk of crack

should

A

this

production 000 tonnes

positive

potential

to reduce

duce parts;

30-40

of

the PM part

quite

the warm compaction

pro-

general interest to t.he powder metallurgy community.

that

has

decrease of the necessary ejection force, which ought sensi-

continue during the forthcoming 5-6 years. This will mean an

these

showed

what

tered

to

magazine and on subjects

pro-

of

pact strength;

and

in the

mistic that this growth rate will

end-

compaction

warm compaction

im-

ductilityiim-

ers on items covered

is opti-

wel-

PM

and

outcome

stated previously,

in sin-

European

PM industry

Report

reason for this limited interest

advantages:

achieved

letters from its read-

users in order to find out the

to

7.4 g/cm”

Powder

comes

between

European

clearly

to

Metal

I

and North America.

contacted part

columns,

Letters to the editor

to find out the causes

contrary

up

as for

single pressure and sintering. Following the two conflict-

contacts

density

function

end

steel mar

an average of

2000.

as by double presssintering and at

seems to offer several valuable

high

parts

systems, the

5X during the last 10 years. The

of

with about the and

assurance

approaching

additional

thus enable

in the warm

in America.

The warm compaction cess is highly interesting

press-

sintering.

material

properties ing/double

as processes

by double

to be produced

process will, in some years time, be of the same industrial

I was

pressing and substantially

ing/double

quality

before

ket has increased

Ry and large, warm compac-

and

for the

is only some-

produced

of this

which

processing

users. The sintered

less than for the same part

Personally, 1 was thrilled by process

of

higher than for con-

sintering

the very large potential

cost

by warm

ventional

and

of warm compaction

of parts, including development of

process

compaction

Paris respectively.

di

of the

parts; produced

what

(PM)

in Toronto

improved

stability

total

parts

AH at

metallurgy

conferences

.

by Hoega-

naes Corp and Hogan& the

finished

process

(warm compaction)

give

mensional

of

advise full technical specifications, age, location and price to the following box number:

much than in

American

part

producers, and of course end users, see an immediate way for cost savings in their production of high density parts. The business climate is also more dynamic than in Europe. Some of t,he European part producers stated want to investigate

Please

Box # 700 M Chlo& Turner Elsevier Advanced Technology P.O. Box 750 Kidlington Oxford OX5 IAS United Kingdom

that they all aspects

MPR March 1995

5