Experiment Report

2021年1月26日发(作者：compendium)


Experiment Report





Mobile Phone Dissembling Experiment

【
Experimental Purpose
】

1
．
To understand the material composed mobile phone
；

2
．
To understand the classification of materials
；

3
．
To understand that the development of material plays an important role in human's lives
；

4
．
To understand that different materials can be made into different products meeting different
demands.

【
Experimental Specimen
】

A Mobile Phone Of Nokia

【
Experimental Operation
】

apart of the mobile phone;
2. Observe the parts of the mobile phone carefully and take some photos;
is the material of the parts, discuss and come to a conclusion

【
Experimental Result
】

1.

The mobile phone casing

The mobile phone casing is usually made of three kinds of plastic materials: PC, ABS, or PC
mixed with ABS.
1

Material
PC
ABS
PC+ABS
1)

PC
Tensile
Strength(Mpa)
69
43
56
Hardness
-Rockwell (R)
120
100
110
Using
temperature(
℃
)
130
60
60







Polycarbonate(PC) is a very durable material. Although it has high impact-resistance, it has
low
scratch-resistance
and
so
a
hard
coating
is
applied
to
polycarbonate
eyewear
lenses
and
polycarbonate
exterior
automotive
components.
The
characteristics
of
polycarbonate
are
quite
like those of polymethyl methacrylate (PMMA, acrylic), but polycarbonate is stronger, usable in a
wider temperature range but more expensive. This polymer is highly transparent to visible light
and has better light transmission characteristics than many kinds of glass.


2)

ABS
Acrylonitrile Butadiene Styrene (ABS) is a terpolymer of acrylonitrile, butadiene and styrene.
Usual compositions are about half styrene with the balance divided between butadiene and
acrylonitrile.
ABS has many advantages: high heat resistance, good impact resistance, high flow, good
processability, good dimensional stability and so it also has some disadvantages, such as

limited weathering resistance and relatively high cost.


screen


There were two types of screen, LCD and LED.
1) LCD
2

A liquid crystal display (LCD) is a thin, flat electronic visual display that uses the light
modulating properties of liquid crystals (LCs). It is an electronically-modulated optical device
made up of any number of pixels filled with liquid crystals and arrayed in front of a light source
(backlight) or reflector to produce images in color or monochrome.

LCD is used in a wide range of applications, including computer monitors, television,
instrument panels, aircraft cockpit displays, signage, etc. It is also common in consumer devices
such as video players, gaming devices, clocks, watches, calculators, and telephones.

2) LED
A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator
lamps in many devices, and are increasingly used for lighting.

3) ITO
Since the the liquid itsel
f couldn’t emit light by itself, there must be a light source under the
liquid crystal, so we need
a material which can both let the current and light pass, it is ITO.

Indium tin oxide (ITO) is a solid solution of indium (III) oxide (In
2
O
3
) and tin(IV) oxide (SnO
2
),
typically 90% In2O3, 10% SnO2 by weight. It is transparent and colorless in thin layers while in
bulk form it is yellowish to grey. In the infrared region of the spectrum it is a metal-like mirror.
Indium tin oxide is one of the most widely used transparent conducting oxides because of its
two chief properties, because of its electrical conductivity and optical transparency, as well as the
ease with which it can be deposited as a thin film.
3.

The
mother board

The
mother
board
includes
Printed
Circuit
Board(PBC),

Chipset
and
other
electronic
components.
1)PBC
PCB is used to mechanically support and electrically connect electronic components using
conductive pathways, tracks or signal traces etched from copper sheets laminated onto a
non-conductive substrate. It is also referred to as printed wiring board (PWB) or etched wiring
board.

3