Properties of ultrafine grain binderless cemented carbide

Properties of ultrafine grain binderless cemented carbide

Attempts t htn particle to relinca size of’ Sin-Fc-K powtlt~rs by ntct4 anical grinding I’ollowt~d by crystallization and nitriding are The aim wa...

156KB Sizes 0 Downloads 59 Views

Attempts

t htn particle

to relinca

size of’

Sin-Fc-K powtlt~rs by ntct4 anical grinding I’ollowt~d by crystallization and nitriding are The aim was to make the particlc~ siztt s~nallrr than thus magnetic domain size.

tlrscribc~d. As-ground an

the powder

amorphous

altc,r

heat

consisted

Sm-Ft,

trt2t mclil

\\as

Partic+

-10

t tian 1hts 300 nm dom;iin c.c,rltarniri~ltioi~

of rFe and

l)hasc.

size

smallet

iini.

size. Thrrr

Mufw..

Vol I:<. IQ 5, 1995.

Bintlrrless Investigated

for

mechanical

NEODYMIUM-IRON

to

t tmperature

and

It is shown

ptrlishtd

structures

that

MECHANICAL

arc

the materials

tlest~ribrd.

can btx hi&l)

for optical uses.

Magnt~tic MECHANICAL

BORIDE

PREPARED

was

properties

M’C grain size. Sintering was reduced by smaller grain size lvith incrttase in hardness and strrngth. Effect,s of grain growth inhibitors uwe related

PROPERTIES

MICROSTRUCTURES COMPOUND

:lO5-312.

WC~:I’:~Ti(:-%“,,Ta(’

tletrrmint~tl

was

by 0 bu: thtb offt,c,ts of this

\$(‘rtl maskt~ti by thcb nitI iding. propt~ilic3 arc’ sunin~ari~t~tl.

Hnrff

AND

OF SUBMICRON

CERMETS

HEAT

BY

TREATMENT

CARBIDE

ALLOYtNG

TEMPERATURE

wtlrr

powders.

produt4

using

Transvcrst~

rupture

hardntsss

wt’r?

c,omparison alloys. many

increased

is

made

Strucr ural carhidta

submicron FORMATION

OF MANGANESE-ZINC

DURING

vrv by

grains

TIC

h and

I-III’ and

convt,ntional

diffrrcnc’es

nitridtl

line

strcngt

with

rorc‘. Thtsrc was grater

CRACK

arc

nott4,

lacking

a Ti(’

horuogrntaity in t,htx

nratcrials.

WEAR

OF CUTTING

TUNGSTEN

HEATING

EVOLUTION

FERRITES

OF SUBSTRUCTURES

TITANIUM

NITRIDES

DURING

HOT

IN

invest

igatcd.

AND BORIDES

OF NANOSTRUCTURED

nitritics

2000

(’

boridrs,

wclrts

and

resin

was

polytystallinr~

millctl

at

cutting

conipositt3

with

of txrbon

tpq iLn(l

a ratig(~ 01’ W(’

diamond

tool

matt~rials

ih

Til3? and this is r&ted to thtb strained state during thermal treatment. (‘onditions for maximum strt,ngth were drt,t~rminrti. CHARACTERISTICS

OF SHORT

LASER

CAST

AND

NITRIDE

the

tnnpa-aturt+.

IRON

CUTTING

It is

substructurrs

anisolrolxc

in

FIBRES

APPLICATIONS

CARBIDE-COBALT

to and

elevated

that

bt~conie

TUNGSTEN

up

Powders

and

rrportrd

A STUDY

at

of toot wtbx in c,ont inuous

interrupted

spt~t~cls anal continuous cutting rcduc,t~tl W(’ t 0111 Illi, The tool nrattsrials w(‘I‘I’ u’C’-ii’:, O.%‘LTaC. which had lo11p7 1001 lilis. antI \%‘-H.T,“~~(:o~X’:,Ti(:~lO.~“,:l‘a(’. ‘1’11thtlianc~titl tools lasted 100 tinic5 as lorig as thtl W!‘(’ (i’\,c’o in t~ontinuous high sI)l,tbd nia~hining.

ambient

Hard materials and too/ steels

IN

COMPOSITES

PRESSING

prwsing. of ‘fi

OF

TOOLS

POLYMER

A comparison

i GPa,

EDGE

CARBIDE

CUTTING

and flat

BY HIGH

SYNTHESIS

in thr system TiC-Tik-WC’-‘l’a(‘-

(‘crmcts h‘i-(‘0

OF TITANIUM

PRODUCED

FOR

of

the

Tih’

prrsc~ncc~

of

drscribctl.

liigh

t.utting

MACHINING

OF SILICON

MATERIALS

DIAMOND

WHEELS

COMPOSITES

A study mechanical without

of‘ sintt’ring, propt~rtiw

VC growth

is rt~porttetl that in 5 minutc5.

grain

growth

of WV-(‘0,

inhibitor.

and

is drscritwtl.

dt~nsifit3tiori

or I5 inlnu(w

with

and It

was complett~ 111

prcsenc’r

of

growth is shown to be rapid. probably clut, IO t~oalcsc’rncc. Substyucnl grain po\c1 h followed 8 lineal t imc rt~lationship. The nanostructuretl nratt~rials showed irn)~r’ovt~tl resistanc’r to

\:C.

Initial

surf&‘?

grain

I( is rt~portt~tl that, a study of that processing and proprl-ties of short cast iron fibres had Irtl to t.he devrlopmt~nl of a diamond cutting whtxcl bonded with t hrsts fihrt>s. In comparison with bronze bonded diamond t hts new material is more suitahlc tiw grinding t.hc case

hard

and

of Si,,N ,

brittle

materials.

the grinding

rate

In was

t.reblcd and thcrc was a six-fold increase in thr grinding ratio.

Machining of Si +N1 Sit‘ :intl Si $ ,-‘l’ih. with a pulsed Ntl I’A(; I;tsc*r. LI;I~ investigated with rcgartl tg) t ho t’;rtv 01 material rc~moval, surl’acl, flnlslr ;\tlcl cracking. reported tendency.

Incrc~asctl to

pulses

i nt’rt’ast’

$moothct’

duration

I liti

ih

t,rat,klng

surfat.t~>~ rcwilt.~tl

fi.onl

pulses. Mattlrial was rt~mo\t~cl a( ‘“1)tc I 0.11 ml.min ‘. short

DIAMOND

COATINGS

CARBIDE-COBALT

ON TUNGSTEN

SUBSTRATES

c?-dcking. USE OF COATED

PROPERTIES

OF ULTRAFINE

BINDERLESS

CEMENTED

GRAIN

CARBIDE

TO INCREASE HIGH

SPEED

CERAMIC

WEAR STEELS

PARTICLES

RESISTANCE

OF

‘I’. lkcda

vt

al.

KfhfJ

Japan).

(Kobt, S;tfJfJi

S;ttht’l Lttl, Kot,(-.

E,/~/ir/rPri,tq

KP()..

Vol 45, No 2. 19%. 41-4.5. (In .Iaparit5t~.) The quality of diamond cI);tt.ings on W’ (‘0

suhstrat.es

tlt~tt~rmine

is thr

disc7lsst~~l. role

A 5tutl)

01’ (‘0

1(1

during

MPR March 1996 39