99% al2o3 промышленный глиноземный блок, керамический глиноземный изолятор, плитка, кирпич

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Характеристики







Products Description


Features:
1.Excellent electrical insulation
2.Relatively low strength and fracture toughness
3.Resistance to wear and corrosive
4.Excellent thermal stability
5.Resistance to high temperatures
6.High electrical resistivity
7.Good chemical stability
8.High corrosion resistance
9. A variety of specifications available.
10.Satisfy various technical request


Dimensional accuracy
Up to 0.01mm
Smoothness
Highest possible mirror
Concentricity
Up to 0.01mm
Parallelism
Up to 0.01mm
The inner hole tolerance
The minimum 0.01mm
Straight flute
The narrowest 0.1x100mm
The thickness of the size
Minimum to 0.2mm
The screw thread
Minimum internal thread M2
Cylindricity
Up to 0.01mm
The linear tolerance
Up to 0.01mm
The smallest aperture
The minimum 0.07mm
Precision process
CNC maching,grinding,lapping
Surface finish
Glazed,polishing or metallized
Visual quality:
1. No cracks, no dark dots, no contamination and sharp edges;
2. Evenly distributed glaze with very smooth surface






Technical Parameters


Alumina ceramic parts
Alumina ceramic parts are made of aluminum oxide ceramics. Alumina is a ceramic material with high thermal conductivity, compressive strength, and thermal shock resistance. It also has a low thermal expansion, making it a suitable material for furnace use in the crucible, tube, and thermo couple sheath form. Aluminum oxide is high hardness and good wear resistance, making it a suitable material for ball valves, piston pumps, and deep drawing tools. In addition, alumina ceramic parts can be easily combined with metals and other ceramic materials using brazing techniques and metallization.




Property
Units
Al2O3 Content
%
96
98
99.5
99.7
Density
g / cm3
3.70
3.80
3.90
3.92
Color
-
White
White
Ivory
Ivory
Compressive Strength @ 25 C
Mpa
2229
2091
2512
2350
Tensile Strength @ 25 C
MPa
200
200
248
252
Flexural Strength @ 25 C
MPa
331
276
324
320
Elastic Modulus @ 25 C
GPa
290
331
366
380
Hardness : Knoop Rockwell
(Gpa) Kg/mm2
R45N
(11.7) 1196
79
(12.5) 1276
77
(14) 1428
85
(15) 1510 90
Thermal Conductivity @ 25 C
W / m-Deg K
20.8
28.1

30.7
31.6
Coefficient of Thermal Expansion @ 25-1000 C
1 X 10-6 /
Deg C
7.9
8.5
8.1
8.0
Specific Heat @ 25 C
cal / g / Deg C
.184
.184
.182
.180
Maximum Working Temp.
Deg C
1650
1650
1700
1700
VolumeResitivity @25C @700 C
ohm-cm
ohm-cm
1 X 10-13
1 X 10-8
1X 10-13
2.2 X 10-9
1 X 10-13
6 x 10-7
1 X 10-13
6 x 10-7
Dielectric Strength
(@Thickness) 100Mils
ac volts
per mil
350

340
335
330
Dielectric Constant 1Mhz
@25C
e' / eo
8.6
9.4
9.7
10.0
Dissipation Factor 1 Mhz
@25C
Tan Delta
.0004
.0003
.0003
.0002
























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