Good Quality 95% Ceramic Wire Guide Eyelets Colored Eyelets Ceramic Yarn Guide
Alumina ceramic is the most mature of the engineering ceramics, offering excellent electrical insulation properties together with high hardness and good wear resistance,but relatively low strength and fracture toughness.Alumina ceramic is generally white but may also be pink or ivory.The color is derived from either the sintering additives or impurities in the raw materials.
| 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 |
Main Features
1) High hardness.
2) High heat resistance: alumina ceramic has excellentthermal stability,which means that it is widely used in areas where resistance to high temperatures is essential.
3) Good wear resistance: alumina ceramic is the material of choice for alumina wear parts.
4) High electrical resistivity: alumina is an electrically insulating material.
5) High corrosion resistance: it is insoluble in water and only slightly soluble in strong acid and alkaline solutions. Good chemical stability of alumina leads to high corrosion resistance.
