Sintering and mechanical behaviour of silicon nitride-silicon carbide nano-composites

Mechanical alloying

Data for hardnc5s rnirron

hard

Prrtlictions

FORMATION OF NANO-CRYSTALLINE AND AMORPHOUS PHASES IN BALL MILLED MOYBDENUM-IRON

for finer

Experiments were

on

wer‘c

matrrials

proc‘c~sst~ti in wqs materials. It is reported proc,tlsscd Thrc~c

in a stt4

stag:cs

identified. high to

in

MO powdrr mull to

st nlctural

had

make

strain. and

5 pm

Fr

putic~lc tabfn

size

into

on

stud)

pressing

shown th:tt hr spra?; dried

sitnmilar

Sintering

rt~tiuc~cd p;utic,le

to

to 01 her

activity

nom anti

hard

inc~rt~~ist~ti with

size.

MO-Fe.

t*volution

arc

is rrdu~cd

solution

up to 18 at “,, 1%~IS ciissolvc4

powdcsr

I)c~n

The MO is ~~cdt~ccd to 10 pm with

lattice

finally

that

SINTERING

AND

BEHAVIOUR

CARBIDE

I. Amattr

(11 al.

amorphizc5

Coatings and ultrahard materials

NITRIDE-

NANO-COMPOSITES

(Turin

t’otqlec~lr~~lc~. Turin.

)

SENSORS

NOVEL

PHYSICAL

COATINGS CUTTING

Metal injection moulding POWDER INJECTION

brttckr’ abrasion rt5ist.atrc.c, iv air and wit tar. \Vorn specimens wvw t~s,tminrtl and 2~ possihlt> c,rosioir mcr~hanisni was ~~~~op~w~i.

and

and t ho

It :tlg.

USING ULTRASONIC

An investigation 01’ t IIC rc,sistanc’(. to erosion of Sic‘ anti I(.,(’ TiPI> h;lsc~d matcriath was tit5criI,c~d. Air and M ittol‘ twrnc at)r:csiolr tests wc’rt’ usecl. Tht> Ii hastbti mat trials wer( rtbpor: t,ti t 0 h;i\,(, t hc>

MECHANICAL

OF SILICON

SILICON

PROPERTIES OF BORON OR CARBIDE BASEI) MATERIALS

((‘,S i

of Ti was

conditions

and sinttlring. It was clystallin~ powdt*rh can

EROSION SILICON

wtbrtl made.

Thea 0b.jec.t

of proc’rss

of hub

compared.

c~onsolid;ition

dcscrihrd.

efft~cts

and toughitcsb

matt~rials

VAPOUR

FOR COMPLEX TOOLS

DEPOSITED SHAPED

et al. (ME’I’EI ‘. Italy. i

F. 12abeuana

IN

MOULDING

SOLID

STATE

TUNGSTEN

DISSOLUTION

CARBIDE

OF

IN COBALT

TITANIUM

BINDER

OXY-CARBO-NITRIDE

SUPERHARD

COATINGS

CONTAINING

SCANDIlIM

I ’ t1 il

hoI~IOiIit~

s t‘

tiisc~usst~ti. stutly EURO’

PM 96: The abstracts

follow

are

of

papers

which

which

were

Diffusion

solid

anti

statr

(‘(I with

1000 or

iI\ couples

of W

presented at the Conference on Hard

(’ WC‘ tiissolvrti

was

rate

being

diffusion

in May

and

(’ had

tlifftarcnt

rates.

\+‘-(‘o

binder

Production,

held in Stockholm,

which

Sweden

pure>

(‘0

ttlrnary (‘0

or

also

SINTERING

MECHANISMS

in

CEMENTED

CARBIDES

at

in

thta

dissol\,cd

b’(‘.

Properties

IN

A

modt~l

BASED ON

CARBONITRIDE-MOLYBDENUM CARBIDE-COBALT

FRICTION

MEASUREMENTS of ‘l’echnoloa.

It was

IN TITANIIIM

Irportetl

mt’asurmtlnts

‘l’i (C,iY)-Mn,(‘Y‘o and

rtasistanctt

Inst.,

of

plasticity

and

hchaviour

925 on

c’

toughness

trmprat

urc’ plastic

to

t’rirtion 1125

(’ enabled c~ontrolling

toughnrss.

than I,eaks

with

25

found is t,he case wert’

:rmpIitudes

various

l’hra oh,jective high

mechanisms was

t,cmpt~rat.urrs IKTS,

with

friction on

Internal at

the study

Krlaxation (Fraunhofer

made

composites to high

measurcmrnts

NANO-CRYSTALLINE TITANIUM CARBONITRIDE POWDERS

intrrnal

ht,cn

materials

dt~formation.

OF

that

had

was to make

structures and t>fftActs of ;iddit ions 01’ tr2ic.c. mct.allic t4emrnts. It was reportc4 that 5, increasr4 thcl \‘ickcr’s hartllrtbss from 2:: to :32 (it’a. Structural ftlaturcs of (‘l’i,Sc,) (t ).(‘.N 1 w(‘rt’ outlinrd and cilscussc~ct. ‘I’hc, crlrrt’nt high cost of SC, was noted A TRIBOLOGICAL COMPARISON

AND

MECBANICAL

OF MIJLTI-LAYER

PVD

and testing

Inst.

1

W

~‘itst’ 01

.J. \:vskocil tbt al. (I I\‘M t’l;tsma I,td.. ( ‘zc~,lr Kcpublic~.) Hardness of Ti 1O,C’.N tuatcrlals was discussrd with rtlgartl 0 c~omposition,

COATINGS

S. Bergc:r ct al. (lsizcl Haifa. lsracl.)

(b-many.

the

but

B transient

INTERNAL

;il.

(‘0.

t hcs in1 tarfacc,.

POWDERS

et

the 111 the

NANO-CRYSTALLINE

V. liicht,er

or C :rt

prest~ncc~ 01

controllt~d

formrd

to

\vas tir3c.rihed.

Processing

CONSOLIDATION

usrti

a11d

lit

directly

I)hascl

wils

of \V(’ in (:o

(’ for 9 hours.

Materials

(‘0

wore

dissolution

atiditions

1200

\v(’

found

Altclastic at

higher

wit,h WC‘-(‘0. :tt 776

and

A .5t utly of wc’ar and nic>chiLnical propt~rtit5 of Ti TiN, ‘l’i\j l’ah and TiN NhN rnultilaycrt~d l)nysic;rl v;i~,obir titpositt4 c9at ingh &its it~sc~ribt~d. It was nottbd that wear of c~oatc~d tools is oftcln initiated by fracture of thca c*oating. The 0 t,,ject was t 0 iilc~rf~a ,t’ t tits fr;tc.t urt’ rcsistanc~c~ 01’ thcs c,cB;lt111gs. Mult i-l:tytnr coating wt’rr considt>rcd with t h(b c.onc’tBl)t that thts layt,rtbd strrlc,tLirt‘ would inhihit rrdcking and incrrasc, fra,~turt3 rc3sist;rnc’e. A comparison was nlad(i ~)ctwc~c~n a singles layer TiN and mult ilayrc+i c,oatings on high speed StcYl.

Applications EFFECTS

OF TOOL/WORKPIECE

TEMPERATURE

ON TOOL

CUTTING

STEELS

HARD

WEAR

WHEN

clc~pc~nclent

c~omposition.

MPR May 1997

53