Silicide coatings for protection of niobium base alloys

Use of prefilm nozzle for fine powder

Al powder,

pioduction

with

S.Sheikhaliev,

S.Lagutkin.

(NPI-MIFI

Uralnetramm,

Sverdlovsk,

Russia.)

-

was reviewed

with

to close-coupled

and

methods.

is reported

that

of gas atomisation

oped.

The

melt

under

pressure

there

is

molten ated.

The

into

to the

produce

centrifugal

20mm

film

is unstable The

solder

and

similarly

without

the intermetallic

2.75gm/cmm3

was

also investigated

pressed

and

bars.

Al

Samples

reached

a density

2.78gmlcmm3, of

32E

slightly

particular

to

Methods of molten metal melt

V.Amigo et al. (Polytechnic Valencia, Valencia, Spain.)

in atomisation

Z.Sparchez.

(103/105,

Blvd. Muncii, Cluj-

napoca, Romania.) Development

PM

of devices

of molten

Samples

metals,

ences

process-

es, was discussed.

A technique,

surised

was used as a case study

fluid jets,

using

methods

melting

for disintegration

in atomisation

of Al with Ti,Al

cermets

and metallic

were

reference

and

pres-

and

and

hot

casting

in structure

and

lined.

Marked

University of

applied

ied using

by

before

the

sub-

lncone1625, 316L

coatings slurry

with stain-

were stud-

in a hydro-ero-

and scanning

electron

were used to examine

samples

and after

erosion

testing.

differproper-

of using PM were outin structures

and

Silicide coatings for protection of niobium base alloys V.Terentieva.

(Moscow Aviation Inst.,

Moscow, Russia.)

were detected

of a protective

silicide base coat-

Studies of interfaces in infiltrated

ing on Nb alloys,

from a slurry

by a thermal

tungsten and tungsten carbide materials

spray

is reported.

Information

I.Zalite. (Riga Technical University,

S.Hamar-Thibault

concerning

Salaspils, Latvia.) It was reported that nanodispersed

Universitaire,

carbonitrides

and cermets

of carbonitrides tion

metals

made

metal

of

of different

Stellite6,

a abrasive

microscopy

and

corrosion

to steel or cast iron

Al,O,,

Deposition

Preparation of transition

microstructures and

were investigated.

without

on

had led to

Wear characteristics

by

and

to investigate

differences

in to wear

sion test rig. Optical

extrusion

in high-

of coatings

materials

less steel and WC-Co

and mechanical

ties. The advantages

properties

in the review.

resistance

strates,

matrix

deposition

improvements

coatings.

were prepared

of Torino,

improvements

the

composites with TiAl particles disintegration

that

oxy-fuel

coatings,

casting to make aluminium

powders.

It is reported velocity

of Nb into the Al matrix.

Comparison on PM methods

oxy-fuel deposited coatings

Torino, Italy.)

up

used

high-velocity

36E.

with

Structures

with

Properties and erosion resistance of M.Rosso et al. (Politechnic

a

to

higher

compounds.

to diffusion

than

10mm

to

Coatings and surface treatment

mixed

less

processed.

hardness

intermetallic

breaks

into

was

Rockwell

was

alloyed,

at 500°C

Hardness

is cre-

was

NbAl,,

a thin

thick,

method

50nm,

or

nozzle,

and

to 30mm

than

powder

of

tangentially

movement

droplets.

It

had been devel-

is supplied

rotary

film,

regard

a centrifugal-hydraulic

method

less Nb,Al

lOOnm, mechanically extruded

Gas atomisation

free-fall

5%

of groups and

their

by plasmachemical

synthesis.

sizes were 5Onm to 200nm. ticles

were

numerous

mainly lattice

had

been

Particle

The powder

par-

monocrystalline defects.

with

The powder

high

chemical

activity,

which

faster

sintering

at lower temperatures.

had

resulted

St.Martin

d’H&es,

It was noted that performance

powders

IV to VI transi-

cermets

et al. (ENSEEG Domain

in

tools

depends

on

of diamond

matrix

properties,

capacity

to bind

the

embedded

particles

firmly

and

the

graphitisation

of

Characteristics

of

composition.

tration

the

binder

of loose

protection

on

re-entry

to

Simulated

re-entry

avoid

depend

by “sincering

on based by

by infil-

was

surveyed.

St.Petersburg,

Russia.) and

It was suggested

Development of aluminium-silicon-

debris

magnesium alloys reinforced with boron

ning

electron

carbide particles

ness

and

stream

in gas atomisation

process

more energetic,

would

parameters

were

unchanged,

in smaller

median

particle

hot

gas atomisation

presented

sizes.

result

Data

for

steel was

with consideration

mechanisms

by the use of preheated

the

process

would

of stainless

and discussed

of how atomisation

make

and if other

are altered

and discussed.

It was reported used

to make

consolidation

Al matrix

to the

Metal matrix composites

Si-Mg

alloys.

Effects of additions of intermetallic

between

compounds on properties of hot

studied.

Mechanical

tigated

at ambient

metal-powder.net

tures.

Wear

with regard

Tl

had been

and

and

at the

properties

properties to the effects

to Al-

interfaces were

were inves-

elevated were

vehi-

atmosphere. out.

also

reaction

with

Sic whiskers

disc

tests

results

used.

were examined

meters.

Wear

reinforced

were

methods. between

surfaces

roughtested

by

A correlation compositions

and tribological

Mechanisms

and

and scan-

Surface

strength

emission

Pin-on-

tracks

by optical

microscopy

flexural

established

tribological

Sic

were described.

were

the sliding

of

bonded

of para-

were suggested.

by

T6 condi-

reinforcement

and

with

followed

were added

Reactions

matrix

extruded aluminium

University

on

acoustic

composites

by hot extrusion

treatment

tests

was

B,C particulates

J.D.Herranz et al.(Polytechnic of Madrid, Spain.)

University,

that PM methods

tions.

powders

pro-

Madrid, Spain.)

heat

gas.

and hardness

J.M.Ruiz et al. (Politechnic

the

tests were carried

Investigations

files were determined

of the gas

to

Y.A.Fadin et al. (VIRIAL Ltd.,

W.G.Hopkins. (Phoenix Scientific Industries, Hailsham UK.) heating

The application to aerospace

silicon carbide whiskers

Compositions,

that

The

to con-

Wear of silicon carbide reinforced with

Hot gas atomisation

mappings

was shown

constituent.

is to provide cles

infiltrated

powders”,

of the coating

tain a eutectic its

was presented.

diamond.

binder

W-Ni,

structure

the process

diamond

of materials

and

Cu-Sn-Ni-Mn

need the

Cohesion

on WC-W,C-Ni

France.)

technique,

temperastudied

of reinforcement.

Nanocrystalline materials Hot compaction of nanocrystalline stainless steel powders by spark-plasma sintering T.Nagae et al. (Toyama Industrial Technology

Centre, Toyama, Japan.)

Nanocrystalline powders

austenitic

containing

stainless 0.9wt%N

steel were