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 사파이어란?
알루미나(Al2O3)가
2300℃이상에서 단결정으로 성장된 결정체
사파이어
특성
1)
뛰어난 광학특성
-
빛의 투과성이 가장 뛰어난 재료
2)
우수한 열전달 특성
-
세라믹 재료중에서 금속과 맞먹는 열전도도를
가짐
3)
저온 및 고온안정성
-
극저온에서 초고온까지 상변태 없이 매우 안정
4) 우수한
기계적 성질, 경도가 Mohs9로써 다이아몬드
다음으로 높다
 Optical Properties
Characteristics |
: 83% transmission
of infrared rays and 80% ultraviolet
rays
(at 10000A)
per 5 mm of thickness
|
|
Index of
refraction : 1.769 |
Examples
of Usage |
: Optical flats,
windows, filters, covers for
electric cells, prisms,
apertures, laser
rods, inserts
|
Corrosion
Resistance
Characteristics |
: Not attacked
by acid or alkali
|
Examples
of Usage |
: Valves, valve
seats, gates, nozzles, tips,
orifices
|
Insulating
Properties
Characteristics |
: Dielectric
constant 7.5 to 13 |
|
Thermal
conductivity 20~25w/m/k |
|
Electrical
resistance 1014
ohm/cm at 500 C
|
Examples
of Usage |
: Substrates,
insulators, bridge posts, spacers,
bushings |
Hardness, wear
resistance, low coefficient of friction
Characteristics
|
: Mohs 9
|
|
Knoop 2000
|
|
0
porosity
|
|
Modulus
of elasticity 410GPa |
|
Tensile
strength 300~400MPa |
|
Compressive
strength 2.4GPa |
Examples
of Usage |
: Guides, knife
edges, balance plates, wear
plates, bearings,wire guides,
stylus tips, anvils, spinnerelles. |
Sapphire often
serves as a permanent, non-consumable replacement
for:
Chamber
windows for endpoint detection
and observation, heater windows, microwave
windows, microwave plasma tubes
and components, lift pins, thermocouple
protection sheaths, gas delivery
plates (GDP's and showerheads), end
effectors and blades, focus
rings, optical sensors and lightpipes,
dummy wafers |
Sapphire
Substrates
For
GaN, other III-V & II-VI Compounds
For
IR Detectors (for the growth of mercury
cadmium tellurium-HgCdTe)
For
High TeSuperconductors and High Frequency
Dielectrics:
For
High Speed IC’s and Pressure Transducers
For
GaAs wafer carriers
For
SOS(Silicon On Sapphire)
Orientations:
A-plane (1120), C-plane (0001), R-plane
(1012) or others
Size
up to 4" diameter
Windows
The optical
transmission characteristics of sapphire,
together with the physical properties of
hardness, strength and chemical inertness,
make sapphire an ideal window material.
Applications
for sapphire windows include spectroscopy,
high pressure chemical or gaseous
reaction cells, and IR windows.
Windows
are available in shapes, sizes, thickness,
and finish to suit the customers requirements.
For
visible and infrared
For
Prism , optical plate
For
Inspection plate for high temperature, high
pressure furnace
For
Sapphire watch glasses
Diameter
from 1mm up to 120mm
Quantities
upto 100,000s
Sapphire
Rods
For
high temperature furnaces and measuring
equipments
Diameter
from 1mm up to 120mm
Sapphire
Knife / Blade
A
sectioning blade for use with Vibratomes,
Microslicers and other Vibrating Microtomes
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