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07-02-2012, 03:29 PM
Post: #1
cryogenic grinding ppt
Hi i need cryogenic grinding ppt for my seminar, it would be real helpful if you guys can help me out
cheers!!!
11-02-2012, 01:20 PM
Post: #2
RE: cryogenic grinding ppt
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02-09-2012, 12:45 AM
Post: #3
RE: cryogenic grinding ppt
please send the ppt, pdf,literature review,imades about the cryogenic grinding
31-08-2013, 04:18 PM
Post: #4
RE: cryogenic grinding ppt
CRYOGENIC GRINDING



.pptx  CRYOGENIC GRINDING.pptx (Size: 311.46 KB / Downloads: 16)

INTRODUCTION

The word ‘cryogenics’ originates from Greek word ‘cryo’, which means cold.
Temperatures as low as -180ºC are attained in cryogenic systems.
The extremely low temperature are produced by using substances called ‘cryogens 'such as liquid nitrogen and liquid helium.
Cryogens are stored in vessels called as Dewar flask which provides good insulation.

CRYOGENS AND IT’S APPLICATIONS

1. Cryogenic fuels such as liquid hydrogen are used as rocket fuels and propellants.
2. Cryogens are used to achieve superconductivity in metals such as tin and aluminium.
3. Cryogens are used for the preservation of bodies of animal and humans. This process is called as cryopreservation.

CRYOGENIC GRINDING PROCESS

Cryogenic grinding , also known as freezer milling/
freezer grinding/ cryomilling is the act of cooling or
chilling a material and then reducing it to smaller
particle size.
2. Almost all materials embrittle when exposed to low
temperature. Cryogenic size reduction utilizes the
cooling effect of liquid nitrogen to embrittle materials
prior to and or during the grinding process.

FREEZER MILLING

Freezer milling is a type of cryogenic milling that uses a solenoid to mill samples. The solenoid moves the grinding media back and forth inside the vial, grinding the sample down to analytical fineness.

APPLICATIONS

Cryogrinding of steel :-The large amount of heat generated during grinding at high speed raises the temperatures at cutting zones excessively. Cryogens such as liquid nitrogen will help in reducing the effect of heat on tool and work piece, thereby increasing the life of the tool.
Thermoplastics :-Nylon, PVC, Polyethylene, Polypropylene are usually machined using cryogenic grinding to form fine powders.
Thermo sets :-Synthetic and natural vulcanized rubber and materials such as bakelite can be economically machined with cryogenic grinding and recycled.
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