Product Brief Description
- 1.High hardness draft, wear-resistant and corrosion-resistant
- 2. Excellent insulation performance and high temperature resistance
- 3.Good thermal stability and customizable size
Product Details Description
1.Excellent mechanical performance and wear resistance
It can usually withstand pressures above 2500 megapascals without plastic deformation or rupture, making it very suitable for structural components that can withstand heavy loads. At the same time, it has a high modulus of rigidity and minimal bending deformation under load, ensuring dimensional stability and accuracy when used as a precision shaft or measuring element. Compared with heavy metal materials, the density of alumina ceramics is only 3.6-3.9 g/cm ³, achieving excellent lightweighting. This is a key advantage for high-speed equipment that requires reducing the inertia of moving parts, such as textile machinery and high-speed spindles. Taking into account these mechanical characteristics, alumina ceramic rods have become an ideal choice to replace traditional metal rods in high-temperature, high wear, and high load environments. They can significantly extend the service life of equipment, reduce maintenance frequency and costs.
2.Excellent high temperature resistance and thermal shock resistance
In the field of high-temperature applications, the performance of alumina ceramic rods far exceeds that of most metal and polymer materials. Its physical and chemical properties are extremely stable at high temperatures, with a melting point of up to 2050 ℃, and can maintain its original shape, size, and mechanical strength at a long-term operating temperature of 1650 ℃. Unlike the oxidation, creep, and rapid strength degradation that occur in metal materials at high temperatures, alumina ceramic rods hardly undergo oxidation in high-temperature environments and have extremely strong creep resistance. They can maintain a predetermined preload or support force for a long time, which is crucial for applications such as kiln components, sintered carrier rods, and high-temperature furnace tubes.
More importantly, its excellent thermal shock resistance - the ability to resist thermal stress damage caused by rapid temperature changes. Through precise formulation control and sintering process control, high-quality alumina ceramic rods can withstand rapid cooling (or reverse) from extremely high temperatures to room temperature without cracking. This characteristic stems from its moderate coefficient of thermal expansion and excellent thermal conductivity, which enables relatively uniform heat transfer in the material and avoids local stress concentration. For example, in semiconductor manufacturing processes, as a wafer carrier arm or heat treatment fixture, it needs to frequently move between the heating chamber and the cooling station; In the metal heat treatment industry, as a guide rail or roller, it needs to withstand the severe temperature fluctuations brought in by the workpiece. Under these harsh thermal cycling conditions, alumina ceramic rods ensure the continuity of the process and the reliability of the equipment due to their excellent thermal shock resistance.
3.Excellent chemical stability and corrosion resistance
Aluminum oxide ceramic rods have extraordinary chemical inertness, allowing them to work stably in many highly corrosive environments, which is unmatched by ordinary metal materials or even special alloys. Its stable α - alumina crystal structure exhibits strong resistance to the vast majority of chemical media, whether it is inorganic strong acids (such as hydrochloric acid, sulfuric acid, nitric acid), strong bases (such as sodium hydroxide), or various halogens, salt solutions, and organic solvents, they cannot effectively corrode it. Therefore, it is widely used in industries such as chemical, pharmaceutical, petrochemical, and electroplating to manufacture stirring shafts, valve stems, pump liners, nozzles, as well as support and fixing components in various reactors.
Unlike metals that rely on surface passivation films (such as chromium oxide layers on stainless steel) to achieve corrosion resistance, the corrosion resistance of alumina ceramics is an intrinsic property that runs through its entire volume. Even if the surface is scratched or worn due to long-term use, the newly exposed internal materials still have the same corrosion resistance and will not cause common problems such as pitting, intergranular corrosion, or stress corrosion cracking in metal materials. In marine environments or applications containing chloride ions, it is completely immune to corrosion and provides unparalleled long-term durability. In addition, its extremely high chemical purity ensures that it does not release any metal ions or other contaminants into the process medium during operation, which is an essential key feature for maintaining product purity in the fields of biotechnology, food processing, and high-end chemical synthesis.
4.Excellent electrical insulation and low dielectric loss
As a high-performance ceramic with excellent performance, alumina ceramic rod is an extremely excellent electrical insulation material. Its volume resistivity is extremely high at room temperature, even when the temperature rises to 500 ℃. The insulation stability at high temperatures is beyond the reach of the vast majority of organic insulation materials. Its dielectric strength (breakdown voltage) is usually in the range of 15-25 kV/mm, which can effectively prevent electrical breakdown phenomena in high voltage environments and ensure the safety of equipment and operators.
In addition to basic insulation properties, alumina ceramic rods also exhibit characteristics of low dielectric constant and low dielectric loss. This means that in high-frequency alternating electric fields, it does not store a large amount of electrical energy or generate significant heat (dielectric loss) like some materials. This feature makes it highly suitable for substrates, brackets, and insulation housings of high-frequency communication equipment, microwave fittings, radar systems, and various electronic components. For example, in electronic devices operating in a vacuum environment, it is often used as an insulating rod to support and isolate electrodes, ensuring electrical isolation and avoiding high-frequency energy loss. Meanwhile, it is essentially non-magnetic with zero magnetic susceptibility, completely unaffected by external magnetic fields, and does not interfere with the surrounding magnetic field distribution. This makes it an irreplaceable functional structural material in magnetic resonance imaging (MRI) equipment, particle accelerators, and various precision electromagnetic measurement instruments.
Product Parameter Table
| The main chemical ingredient |
|
|
Al2O3 |
Al2O3 |
Al2O3 |
| Bulk Density |
|
g/cm3 |
3.6 |
3.89 |
3.4 |
| Maximum Use Temperature |
|
|
1450°C |
1600°C |
1400°C |
| Water absorption |
|
% |
0 |
0 |
< 0.2 |
| Flexural strength |
20°C |
MPa (psi x 103) |
358 (52) |
550 |
300 |
| Coefficient of thermal expansion |
25 - 1000°C |
1X 10-6/°C |
7.6 |
7.9 |
7 |
| Coefficient of thermal conductivity |
20°C |
W/m °K |
16 |
30 |
18 |
EN
