Effect of water on structure and magnetic properties of ferrite

Fabrication of soft magnetic cores by spark-plasma sintering S.Yamamoto et al. (Yamapchi J.J@an Sot. Powder/Powder 2000, 757-762. In Japanese. Ferrite were

disc cores

fabricated

powders

Llnwersity,

Metall. ,.Vol 47, No 7,

and laminated

from

ferrite

by spark-plasma

was low after long sintering lay/ferrite strength,

laminated saturation

magnetic

disc cores

and

Permalloy

sintering.

Porosity

times. The permal-

discs showed magnetic

properties

at high

high bond

flux and had soft frequencies.

discs were for use as inductors, and magnetic

Ube, Japan.)

The

transformers

Sm-Fe-N These

SmjFe17N3 above

450°C

Effects milling, made

of

Mg-Cu-Zn

was studied.

It is shown

by dry grinding

properties

have

during

that ferrites

lower

magnetic

that those made by wet grinding

or

aFe

in Sm-Fe-N

gested that further

Mixtures

Vol

magnetic

materials

is

It is suggsted

800MPa

and 1 100°C

thermo-dynamically ditions

Data

concerning

is presented.

for six hours. Diamond unstable

with 40~01% diamond

into graphite. sintered

as samples without

to the

diamond

Suihppo

Maw-i&,

S.Q.A., Vol

Genoa,Italy.) ht. J.Refracrory Metals/Hard/Mater., 19, No 1, 2001, 1l-16. performance

of

was investi-

gated under arduous conditions. material

It is reported

is comparable

Defect

characterisation

used for cutting TiC-

uncoated

Ti(C,N)-(Ti,W)c-TaC-Co-Ni-W

M.Zeren, S.Karag&. (Kocaeli UnwersIty, Turkey.) lnt. J.Refractory Metals/Hard/Mater., No I, 2001, 23-26.

with

ed. Factors

had

affecting

study used electron

tools,

was investigat-

tool performance,

materi-

were considered.

microscopy

loop

The

to examine

mond tools with a Co-Ni-Cu-Sn

CNC-closed

Kocaeii, Vol 19,

in diamond

stone materials,

al and process parameters

I

matrix,

diamade

controlled

n Freely programmable n Accuracy +/-0,Ol mm (+/-0,0004

n Synchronized

inch) movement

of axes II High active forces II Quick tooling exchange n Fine control of top punch hold down When demand

you the finest.

Lauffer

offers

Sizing,

a full line of Compacting,

and Custom

built presses to meet

the P/M needs of today. Designed made

for the production

from

technical

carbide, ceramics

demanding

_ orming Technologies,

Maschinenfabrik D-72160

WI 53072

Phone:+l-262-523-1800 Fax: +1-262-523-l E-mail: Web.

818

[email protected] www.laufferusa.com

under

I

E-mail:

-

Lauffer GmbH Et Co. KG 101

Horb a. N., Germany

Tel.: +49-7451-902-O Fax: +49-7451-902-100 Web

and

the most

lmPRESSEN

INC.

of parts

iron powder,

conditions.

IndustriestraBe Pewaukee,

is

under these con-

Optimisation of properties of diamond cutting tools by microstructural characterisation

High-performance cermet tools based on complex compositions.

new

parti-

by HIP at

double the hardness.

Hard materials and tool steels

the

and diamond

but did not decompose

same density

that

Al,O,

of TiN,

of

Cutting

will result in

cles coated with TiN were fabricated

had been detected.

et al. (Centro

development

than

It is sug-

Ultra-high pressure hot isostatic pressing of materials containing diamond

Samples

SmFe,

better

C-steel.

S.Kume er al. (National Industrial Research Inst., Nagoya, .lapan.)Int. J.Refractory Metals/Hard/Mater., Vol 19, No 1, 2001, 17-22.

that a new meta-stable

magnets.

and

improvement.

that this could be the basis of a new generation permanent

materials

of

and gave 92% density.

It is reported

tool

grades in cutting

significant

HIP was at

PM Industry,

available uncoated

magnetic

with the object magnets.

Beijing, China.) 10, No 5, 2000, 26-31. In Chinese.

B.Vicenq

S.lto et al. (Saence Uniuermy of Tokyo, Noda, Japan.) JJapan Sot. Powderll’nwder Metall.,.Vol 47, No 7, 2000, 80 J-806.In l@anese.

and

and

YLuo.(IEEE-TC,

treated with water after dry grinding.

HIP sintering and magnetic properties of samarium-iron-nitrogen

SmN

sintering

were investigated

phase, SmFe,,

and magnetic

ferrires,

to

by HII?

properties.

Samarium-iron intermetallic compound for a new generation of magnets

Interest

of water on structure

properties

HIP

and 200MPa

expressed.

T.Aoki et al. (TDK Corporation, Narita, Japan.) J .Ja@n Sac. Powder/Powder Metal., .V<>l47, No 7, 2000, 76% 773. In Japanese.

magnetic

decomposes

600%.

properties

were fabricated

high

making strong permanent

card readers.

Effect of water on structure and magnetic properties of ferrite

materials

have

[email protected] www.lauffer.de

New Reader Enquiry Service No 631. Go to www.metal-powder.net to make your enquiry.