Properties of feedstock with polyethylene-glycol binder

Use of prealloyed

Ceramic materials

Cu-Co-Fe

powder as the

binder for diamond tools was investigated

with

Dense nano-scale ceramics sintered by transformation assisted consolidation

performance

W.E.Mayo et al. (Rutger’s Uniuersity, New Jersey, USA.) lnt. J. Powder MetaU., Vol37, No 1, 2001,45-54.

Co. The diamond grit is shown to degrade dur-

regard to various processing

TiO,,

Si,N,,

that

Al,O,

dense

nano-structured

and Al,O,-X02

materials

had been prepared by a combination solidification

processing,

of meta-stable

ic powders, and transformation idation.

of rapid ceram-

assisted consol-

High pressures decrease diffusion and

enhance

nucleation.

and densities materials

Grain

above 99%

had high

sizes below 20nm were attained.

strength

tance and low friction. ing 2 homogeneously

and wear resis-

In composites distributed

phase retards grain growth

The

compris-

phases each

in the other

and

The Cu content

was selected to give tools of full density at hot pressing

It is reported

methods and tool

in rock cutting.

temperatures

ing processing

150°C

lower

in non-reducing

for

atmospheres.

high

Ti or Ni, are reviewed with reference to processFormation

of a

of molten

Al into a Ni powder preform was investigated

Hard materials and tool steels

with regard to process conditions. that

the

infiltration

resulted

It is shown

in synthesis

of

Synthesis and consolidation of aluminium nitride nano-powders

NiAl, without formation of other phases such as

R.J.Dowding et al. (US Army Research Laboratory, Aberdeen Proving Ground, USA.) Powder Metall., Vol 43, No 4, 2000, 380-385.

penetration

Use

of microwave

AlN nano-powders

plasma

by a novel retains

plasma

Comparison

technique.

This

and inhibits

grain

conductivity

is made

added as a sintering

of

AlN powders

to near full density

pressure

the fine structure

growth. Thermal

period

for synthesis

is described.

were rapidly consolidated

Ni,Al,.

with

was determined.

This

is attributed

for the exothermic

enhancer.

reaction

of Al to reach NiAl,

allowing

stoichiometry.

powder

structure which

to structural

powder

with

Milling

had a X-Al

spacing

reduced

accelerated

was completed.

temperature

sintering

by

synthesis

Sintering

gave fully dense

at

material

with fine grains.

Powder injection moulding Properties of feedstock with polyethylene-glycol binder L.Duxin et al. (Central South University of Technology, China.) PM Technology, Vol19, No 3, 2001, Changsha, 136-139. InChinese. Propeties injection

of a Fe-2%Ni/polyethylene

moulding feedstock

glycol

were investigat-

ed. The binder is shown to adhere well to the metal

powder

and

homogeneous

feedstock

with a high solids loading could be easily prepared with good moulding properties.

Erosion resistance of iron aluminide reinforced with titanium diboride or tungsten carbide J.A.Hawk et al. (Albany Research Centre, Albany, USA.) PMsMnceand~~~logyBriefs,Vol2,No2,2ooO,22-25. Solid

particle

erosion

and FeAl-8Cvol%WC

AlN-3wt%Yz0,

to the incubation

with reference milled

milling.

of TiAl

from elemental

alloying and reactive

The

lamellar longer

based on Al with Fe,

near net-shape material by infiltration

of TiAl

evolution.

M.R.Ghomashchi. (University of South Australia, Mawson L&s, Australia.) J. Mater. Proc. Techn. ,Vol 112,No 2-3,2001, 227-235. materials,

Synthesis

was investigated

Fabrication of near net-shape aluminium base intermetallic matrix composites

Intermetallic

LXiaoqiang et nl. (Harbin Inst. of Technology, Harbin, PM Technology, Vol 19, No 3, 2001, 13113.5.Jn Chinese.

China.)

by mechanical

Intermetallic materials

ing, properties and applications.

grain sizes down to IOnm result

than

Preparation of titanium aluminide by mechanical milling and reactive sintering

18(X,

500°C

WC-(6

and lO)%Co.

of FeAl-4Ovol%TiB2

was investigated at 25OC,

and 700°C

and compared

with

Erosion rate of FeAl-TiB2

with

temperature

High-performance sintered self-lubricating bearings C.Molins et al. (S.A.Ames, Barcelona, Spain.) PM Science and Technology Briefs, Vol2, No 2, 2000, 5-9. It is reported

that new composite

for self-lubricating

bearings

Consolidation of diamond tools with coppercobalt-iron binder

was constant

P.Muro et al. (Uni~eersityof Navarxz, San Sebastian, Spain.) Powder Metall., Vol44, No 1, 2001, 82-90.

FeAl based materials could be used for erosion

could be replaced

resistance at elevated temperatures.

considered.

with WC, and WC-Co, increase

but for FeAl

PM components

the rate declined with

in temperature.

It is suggested that

oped. Results

of tribological

ed and compared als. Potential

materials

are being develtests are present-

with conventional

applications,

where

materiball races

by the new materials

are

Conference proceedings High-performance Ancorloy MD materials

M Baran, Properties

It was noted that some PM Si steels had been to compete with malleable and duc-

tile cast irons and that these were available binder treated ‘ready-to-press’ mixtures hd a

good mechanical

evaluated

in

Comparison

86

MPR

a

properties.

production

These

were

environment.

2002

as

which

was made with steels without Si.

July/August

R.J.Causton.

(Hoeganaes

Corporation,

USA.)

S.O.Shah et al. (Hoeganaes Corporation, USA.) introduced

Properties of sinter-hardened and heat-treated steels

High-performance alloy steels containing silicon

Sintered steels

of new high

were reported

with conventional at 1260°C.

Si sintered

to have properties

PM steels when

Densification

Machinability

regard to the benefit tion methods.

was

sintered

could be improved

by use of double press/double ing.

steels

competitive

sinter

investigated

of advanced

M.R.Haas,

with

with

from

to

and

at reduced

on

1.5%Ni-1

prealloyed

sintering

steels

to production

materials

tolerances tests

(Kobe

hardened

regard

mance

processdensifica-

H.Suruki.

Japan). Sinter

steel

rapid cooling

Steel

Co.

were

reviewed

of high

close

Ltd.,

perfor-

dimensional

cost.

Data from

.O%Mo-steel, powder

made

by pressing,

and tempering,

was

presented.

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