Development of a process for making micro-porous components

In

some

experiments

were milled, phisation.

lwt%

being

stearic

aid amorphization. metallic

only

the third

acid

Binary

compounds

two

after amor-

was

and

by optimisation

elements

added

added

ternary

were formed

according

to

Modelling of transient temperature fields during filling stage of injection moulding

stock

was simulated

ence

methods.

by finite

Effects

of process

perature

to rise to levels

dangerous

feedstock.

Process

conditions

the

affect

temperature

gate

Temperature

parameters

in the part was may cause temfor the

and location

homogeneity

of

distribution. can

he improved

tooling

and

re-use of tools, are noted.

prototyping that

is

some

metals,

properties.

Experiments

composite

materials

Effect of atmosphere thermal debinding J.A.Grohowski, USA.) that

are

influenced

was discussed.

profiles

Inc.,

of hinders

Effects

monitored

analysis,

of hinders

pressures.

can he optimized

conditions.

processing,

were

to illustrate

by

thermo-

investigated hinder

for

of partial for a

responses.

Metal injection moulding processing of titanium aluminide intermetallic compounds K.Katoetal. (National lapan.J Investigations and

Mechanical

56

in

of powder It is noted

injection that

can

Safety matters Dust explosibility C.J.Dahn

et

al.

of metal powders

(Safety

moulding

optimization

of

Consulting

Engineers,

Inc.) PM Scmce/Technol. Briefs, Vol 2, No 4, 2000, 14-17.

cussed.

J.Duszczyk et al. (De& Uniuersiry of Technology, De@, The Netherlands.) PM SciencelTechnol. Briefs, Vol2, No 3, 2000, 9-12. Advantages

to ‘trial

Simulation

the main problems.

A methodology

are reviewed.

possible modelling

alternative

methodologies.

dangers.of

had

1.5%

The

Cr-Nh

elongation alloy

at room showed

for evaluation

dust

Factors

hybrid

size

hybrid

mixtures

and

acteristics

of metal

influenced

by lubricant

hazards,

surface

inert

are considered.

in dis-

explosion

shape,

and

of potential

mixtures

influencing

particle powders

and

coatings,

additives, The

powders

of metal

explosion

char-

are shown

to he

additions,

and chemi-

cal additives.

at elevated

by MIM

Industrial Research Inst., injection

TiAl-Cr-Nh properties

MPR March

2002

can he made

dehinding

must

and reduction

he

in prop-

G.Anderson

were and

described. elevated

The alloy with Cr

rials and

developed

that

a technology

for production

dense

surface

and

closed

and rounded

of parts

a core

a gas at high

moulding

feedstock

pressure

Gas dissolves growth

size and the surface ditions.

Similar in extruded

small, by

in the hinder as the pressure

is arrested

by cool-

skin is dense.

phenomena materials.

Skin

of process have

also

in

thickconbeen

them

single component problems

Singapore.)

2 different

together

was noted. and

Parts

mate-

to make

Process

process

parameters

were

comprising

magnetic

and

stainless

steels were discussed.

Effect of variations in cooling rate from hip on duplex stainless steels S.J.Mashl, J.D.Hall. (Bodycote IMT Inc., USA.) regard

stainless

to production

superior ment Newer

steels were discussed

with

by HIP that makes

alloys

to equivalent

Slow cooling that HIP

Formation

from

requires presses

cast/wought

ed. Volume

emhrittle-

heat

to rectify.

treatment

allow

of the s phase, fraction

materials.

HIP may cause for faster as functions

ing rate and part cross-section cal properties

a

develop-

High performance steels

Duplex

the barrel

Pores are 5 to 200mm

ness and pore size are functions found

a fully

into injection

as it flows along

as small bubbles

Bubble

with

containing

pores. This is achieved

injecting

is reduced.

had been

of moulding

sintering

non-magnetic

etal. (Southco Inc., USA.)

It was reported

and is released

of

The attraction

illustrated.

Development of a process for making micro-porous components

of

L.K.Tan. (Advanced Matenals Tech&ones,

ment,

of the IM machine.

Napya,

moulding

ambient

wee measured.

It is shown

materials

ertles.

ing and solidification. of

mechanical

temperatures.

hut supercritical

Powder injection moulding bimetallic components

temperature.

good

removals

reduced

and for selection

dehinding

temperatures

low

Threedimensional simulation of pressure development in powder injection moulding

properties

It was

and hinder

by

Temperature/pressure

TiAl-Cr

at

and wear

are described.

that these intermetallic (HJE Company

volatilisation

for dehinding

range

sprayed

and

is

to make prototypes

used to avoid oxidation dehinding

gravimetric

pressure on

J.T.Strauss.

noted

pressure

It

locate

needs

costs of new

Computer

to he a viable

error’

and

High

re-optimization,

is considered and

new part.

PM2TEC2001 The following Abstracts are from papers presented at the 2001 International Conference on Powder Metallurgy and Particulate Materials, which was held in New Orleans, USA in May 2001.

Powder injection moulding

given

and

discussed.

have poor mechanical

Con

Thermal

is complex

Rapid hard tooling by plasma spraying for injection moulding sheet metal forming

noted

steel feed-

parameters for each

temperatures,

element/differ-

on temperature development estimated. Frictional heating

moulding revision

Rapid

J.Duszczyk et al. CD& Unwers~ry of Technology, De&, The Netherlands.) Powder Metall., Vo143, No 3, 2000, 228-232 of a stainless

and process

H.Zhang et al. (Huazhong Univewty of Science and Technology, W&an City, China.) Th in Solid Films, Vol 390, No I-2, 2001, 7-12.

Metal injection moulding

moulding

design

to

inter-

conditions.

Injection

of mould

conditions.

of s phase

cooling. of cool-

was investigatand mechani-

were determined.

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