Vinit Murmu 09MT3017

Piyush Verma 09MT3018

Metallic Glasses for pressure sensors

Course: Advanced Materials and Processes

A brief presentation on

Department of Metallurgical and Materials Engineering IIT Kharagpur

These Pressure sensors uses diaphragm, conventional is stainless steel (made by cold forging) .

Measures the displacement of a diaphragm by means of changes in inductance.

About Electromagnetic Pressure Sensors

•Increased sensitivity of the sensor by having a

lower young’s modulus and high strength

material.

•BMG meets this requirement.

•BMGs diaphragm of sensors are made by liquid

forging techniques.

•Zr55Al10Ni5Cu30 have Young modulus 100GPa,

half of steel, and sensitivity 3.8 times that of

stainless steels

By Vapour deposition

at low temperature

BMG Diaphragm

Relationship between Young's modulus and strength

Recent progress of bulk metallic glasses for strain-sensing devices. N. Nishiyama ,

K .Amiya, A. Inoue

CMF-Coriolis Mass Flowmeter

Recent progress of bulk metallic glasses for strain-sensing devices. N. Nishiyama ,

K .Amiya, A. Inoue

• Comparison of sensitivity of Ti41.5Zr2.5Hf5Cu42.5Ni7.5Si1 and conventional SUS316L pipe.

• Linear correlation coefficients of the data are evaluated to be

0.9997 for Ti-based BMG and 0.997 for conventional pipe.

• BMG alloy found to be 28 times more sensitive

Recent progress of bulk metallic glasses for strain-sensing devices. N. Nishiyama ,

K .Amiya, A. Inoue

New sensors based on the magnetoelastic resonance of metallic glasses

A magnetoelastic material changes its dimensions when

it is exposed to a magnetic field.

We present the response of ME resonators based on amorphous

ferromagnetic ribbons to the position of a moving magnet

which produces a field varying largely in the ribbon dimensions

New sensors based on the magnetoelastic resonance of metallic glasses. J.M.

Barandiaran, J. Gutierrez, C. Gomez-Polo

8-cm-long strips of Metglas® 2605SC amorphous alloy

(iron-based composition)

saturation magnetostriction, λs=30×10−6

spontaneous magnetization, Js=1.61 T

• Field-annealed for 10 min at 390°C under an static

field H=0.45 T

(gives rise to stripe domain structure that maximizes their

magnetoelastic response.)

Experimental

Results

For the first peak a strong linear

behaviour of fr1 and A has been

observed when the magnet is

displaced from/to the center of the

sample.

Conclusions

For the first peak a strong linear behaviour of fr1 and A1 has

been observed when the magnet is displaced from/to the

center of the sample.

An almost constant signal with a low variation of the

resonant frequency is observed when the magnet is located

close to one end of the sample.

Possible Applications

In any case these effects can be used to detect the presence of

inhomogeneous fields and to sense the variation of other

quantities which can be converted into such fields.

The direct use of the magnet or the interposition of a soft

magnetic material can be used in proximity sensors.

Thank You