Alumina ceramic rod is a type of ceramic product made from high-purity alumina materials through a series of manufacturing processes such as shaping, drying, and firing. The alumina content in these rods is typically greater than 95%, which gives them excellent mechanical, thermal, and electrical properties.
Alumina ceramic rods come in a variety of shapes and sizes, including round, square, and rectangular, and can be custom designed to meet specific requirements. They are often used in applications where high-temperature and wear resistance are critical, such as in the semiconductor, aerospace, and medical industries.
Alumina ceramic rods have a high melting point, making them ideal for use in high-temperature environments. They also have excellent hardness and wear resistance, making them resistant to scratching, abrasion, and corrosion. In addition, they have good electrical insulation properties, making them ideal for use in electrical and electronic applications.
Features & Benefits
Markets & Applications
| Dimension | Outer dia. mm | Inner dia.mm | Length mm | Remark | |||
| Item | |||||||
| Thermocouple protection tube | 7-170 | 1-110 | 10-2500 | If you need others,we can customize for you. | |||
| Insulated tube | Single hole | 2-530 | 1-500 | 10-5200 | |||
| (inner core) | Double holes | 1-10 | 0.4-2 | 10-2500 | |||
| Four-Nine holes | 1-10 | 0.5-2 | 10-2500 | ||||
| Item | Test Condition | 78-82% Al2O3 | 95% Al2O3 | 99% Al2O3 | 99.5% Al2O3 | ||
| Physical properties | Density | g/m³ | >2.9 | >3.6 | 3.89 | 3.96 | |
| Moisture absorption | % | 5-7 | 0 | 0 | 0 | ||
| Mechanical properties | ROHS Hardness | 60-70 | ≥85 | ≥89 | ≥89 | ||
| Flexural strength | psiX103 | 20℃ | 358 | 550 | 550 | ||
| Compressive strength | psiX103 | 20℃ | 2068(300) | 2600(377) | 2600(377) | ||
| Fracture toughness | Mpa.m3/2 | K(l c) | 4.3 | 5.6 | 6 | ||
| Thermal properties | Maximum use temperature | ℃ | 1350 | 1450 | 1600 | 1650 | |
| Thermal expansion coefficient | 1X10-6/℃ | (25-1000℃) | 6.1-6.6 | 7.6 | 7.9 | 8.2 | |
| Thermal shock resistance | ℃ | Tc | very good | 250 | 200 | 200 | |
| Thermal conductivity | w/mok | 20℃ | 16 | 30 | 30.4 | ||
| Electrical properties | Volume resistivity | Ohm/cm2 | 100℃ | >1013 | >1013 | >1014 | >1014 |
| Dielectric breakdown strength | KV/mm | 8.7(220) | 8.7(220) | 8.7(220) | 8.7(220) | ||
| Dielectric constant | (E) | 1MHz25℃ | 9 | 9 | 9.7 | 9.7 | |
| Dielectric constant (100MHz) | (E) | 9.5 | |||||
