presentation on metllic glass

1. METALLIC GLASS
PREPARED BY
- Nawaz Purawala
- Trupal Patel

2. INTRODUCTION
• With the advent of material science and so
many new engineering material are
discovered having major application in
industries.
• This are classified as metals and
alloys,cermics,glasses,glass
ceramics,composites and semiconductor.
• Our presentation is on one of such material
which is METALLIC GLASS.

3. METALLIC GLASSES
• It shares the property of both metals and
alloys.
• Metallic glasses are metal alloy that are
amorphous.That is they don’t have long range
atomic order.
• The major advantages of such glasses are that
they are generelly homogeneous in
composition,offer strong and superior
corrosion resistance.

4. TYPES OF METALLIC GLASSES
• Metallic glasses are of two types based on
their base material used in preparation.
1. Metal-Metal glasses.
Eg. Ni-Nb,Mg-Zn and Cu-Zr.
2. Metal-metalloid glasses:tra like Fe,Co,Ni and
metalloids like B,Si,C and P are used

5. PREPARATION
• To have peculiar property, metallic glasses are
to be made by cooling a molten metal rapidly
at rate of 2*1060 Cs-1.
• During the proccess of solidification,atoms do
not have enough time or enegy to rearrange
for crystal nucleation.Thus,li reaching the glass
tranition temperature Tg solidifies as metallic
glass.Again,upon heating metallic glasses
shows a reversible glass-liquid transition at Tg

6. TECNIQUES OF PREPARATION
• Various rapid cooling tecniques such as
spraying,spinning and laser deposition are
used for the production of metallic glasses.

7. Melt spining technique
• In this tecnique,there is a spinning disc made
of copper .
fig -

8. PROPERTIES
• High strenth but lighter in weight.
• They are ductile ,malleable,brittle and opaque.Hardness is
very high.
• The toughness is very high i.e. the fracture resistance is
very high.
• High elasticity.
• High Corrosion resistance.
• They are soft magnetic materials.As a result,easy to
magnetisation and demagnetisation are possible.
• Narrow hytresis loop thus low hytresis energy losses.
• They have high electrical resistivity which leads to a low
eddy current loss.

9. APPLICATION
• Metallic glasses are used as transformer core material in high
powertransformers.
• Due to its high electrical resistivity and nearly zero
temperature coeficient of resistance,these materils are uset in
making cryothermometers,magnetoresistance sensor and
computer memory.
• As the magnetic property of metalic glass are not affected by
irradiation they are used in making container for nuclear
waste disposal.
• These materials are used in preparation of magnets for fusion
reactors and magnets for leviated trains etc.
• Metallic glasses can also be used for making watch cases to
replace Ni and other metals which can cause allergic
reactions.

10. • Used in cutting and in surgical instrument.
• Infuture ,it will be used in electronic field can
yield stronger,lighter,and more esaily moulded
castings for personal electronics products.
• They are used in tap recoders as heads ,in the
manufacture of springs and standard
resistances.