Customized industrial precision ceramic alumina ceramic shaft

Overview of Alumina ceramic shaft

Alumina ceramic shafts are mainly composed of Al₂O₃. Alumina ceramic shaft is a kind of alumina ceramic parts that have extremely high hardness, good wear resistance, and can operate stably in friction environments. They are widely used in industrial machinery, electronic equipment, aerospace and other fields, providing strong support for the stable operation of equipment.

Features of Alumina ceramic shaft

Alumina ceramic shaft is a ceramic shaft made of alumina as the main raw material, which has many excellent characteristics. The hardness of the alumina ceramic shaft is extremely high, reaching level 9, which is several times higher than the hardness of general metal materials. It can resist scratches from external objects and extend its service life. At the same time, the alumina ceramic shaft has excellent wear resistance, which can reduce wear during high-speed operation and improve the efficiency of equipment. In addition, the alumina ceramic shaft also has excellent corrosion resistance and can be used in harsh environments such as acid and alkali without corrosion or deformation. Its insulation performance is also very excellent, and it can be widely used in electronic and electrical equipment to avoid safety hazards such as current leakage and fire.

In terms of physical properties, the alumina ceramic shaft has a low density and is lighter than metal. It also has good high-temperature resistance and can operate stably in an environment up to 1650°C, and the operating temperature can reach 1650°C without mechanical load. Its thermal conductivity is 20 to 32W/MK, the linear thermal expansion coefficient is 7~8×10⁻⁶/°C, and the thermal shock resistance can reach 200°C (put in water), which can adapt to environments with more drastic temperature changes. At the same time, the alumina ceramic shaft has good thermal conductivity, can quickly dissipate heat, and maintain stable operation of the equipment.

In terms of chemical properties, alumina ceramic shafts exhibit good chemical stability, acid and alkali resistance, and corrosion resistance. They can maintain stable performance even in harsh chemical environments and are particularly suitable for reaction vessels, pipelines, and protective components in the chemical industry. In addition, alumina ceramic shafts are biologically inert, harmless to the human body, and have good food compatibility.

In terms of mechanical properties, alumina ceramic shafts have medium to ultra-high mechanical strength, with a compressive strength of 2000 to 4000 MPa, a flexural strength of 280 to 350 MPa, a fracture toughness of 3~4 MPa·m¹/² or 4.5 MPa·m¹/² (99.5% alumina), and a Young’s modulus of 320 to 370 GPa. They are not easily deformed when subjected to force, which is conducive to increasing working speed and achieving higher precision. In addition, alumina ceramic shafts also have high hardness, with a hardness of 13.7 GPa for 95% alumina and a hardness of 15.2 GPa for 99% alumina and 99.5% alumina.

Specifications table of Alumina ceramic shaft

Specification	Details
Material	Alumina, with purity levels of 95%, 96%, 99%, 99.5%, 99.7% etc.
Appearance	White, smooth surface, no visible defects
Diameter	Usually ranges from 1 mm to 50 mm or even hundreds of millimeters, with some special requirements allowing for larger diameters
Length	Generally 10 mm to 1000 mm, can also be customized to longer lengths
Hardness	8-9 Mohs hardness, with 99% alumina ceramic shafts having a hardness of about 91 HRA and 95% alumina ceramic shafts about 89 HRA
Density	3.6-3.92 g/cm³, such as 95% alumina ceramic shafts at 3.7 g/cm³ and 99.7% alumina ceramic shafts at 3.92 g/cm³
Compressive Strength	≥2000 MPa, like 95% alumina ceramic shafts at ≥2000 MPa and 99% alumina ceramic shafts at ≥2500 MPa
Bending Strength	≥280 MPa, for example, 95% alumina ceramic shafts at ≥280 MPa and 99% alumina ceramic shafts at ≥300 MPa
Thermal Conductivity	20-32 W/m·K, such as 95% alumina ceramic shafts at 20 W/m·K and 99% alumina ceramic shafts at 30 W/m·K
Coefficient of Thermal Expansion	7-8×10⁻⁶/℃, for instance, 95% alumina ceramic shafts at 7.5×10⁻⁶/℃ and 99% alumina ceramic shafts at 7.8×10⁻⁶/℃
Maximum Operating Temperature	1500°C-1750°C, such as 95% alumina ceramic shafts at 1500°C and 99% alumina ceramic shafts at 1750°C
Volume Resistivity at 20℃	≥1×10¹⁴ Ω·cm
Dielectric Strength	≥15 KV/mm, for example, 95% alumina ceramic shafts at ≥15 KV/mm and 99% alumina ceramic shafts at ≥20 KV/mm
Dielectric Constant at Room Temperature	9-11.5, such as 95% alumina ceramic shafts at 11 and 99% alumina ceramic shafts at 10
Linear Dimensional Accuracy	Depending on the product’s specific shape and process requirements, generally cylindrical degrees can reach 0.003 mm, coaxiality 0.002 mm
Surface Roughness	Can reach Ra0.02-0.04 μm

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Applications of Alumina ceramic shaft

In the machinery manufacturing industry, alumina ceramic shafts are often used to manufacture bearings, transmission shafts, pump parts and valve accessories. With their high hardness and wear resistance, they can reduce equipment maintenance costs and downtime, and can effectively extend the service life of equipment and reduce failure rates. The application of cutting tools and cutting tools provides high-precision and high-efficiency cutting performance for the metal processing industry.

In the field of electronics and electrical, alumina ceramic shafts are widely used in the manufacture of high-frequency electronic components, microwave devices, ceramic parts of semiconductor processing equipment, and electronic components such as temperature sensors and pressure sensors to meet the needs of special working environments such as high temperature and high frequency.

In the chemical industry, it is used to manufacture corrosion-resistant chemical equipment parts, such as reactors, purifiers, etc., as well as chemical filler balls and inorganic microfiltration membranes. Its inertness and chemical stability ensure that it does not react with the chemicals it contacts and maintains the integrity of the chemical process.

In the field of medical devices, alumina ceramic shafts are used to prepare products such as artificial joints due to their good biocompatibility and wear resistance.

In the aerospace field, alumina ceramic shafts can be used to manufacture thermal protection systems and engine components of spacecraft, taking advantage of their high-temperature performance and corrosion resistance.

In addition, alumina ceramics are also widely used in other industries, such as refractory materials, optics, and automotive parts.

Company Profile

RBOSCHCO is a trusted global chemical material supplier & manufacturer with over 12 years of experience in providing super high-quality chemicals and Nanomaterials. The company exports to many countries, such as the USA, Canada, Europe, UAE, South Africa, Tanzania, Kenya, Egypt, Nigeria, Cameroon, Uganda, Turkey, Mexico, Azerbaijan, Belgium, Cyprus, Czech Republic, Brazil, Chile, Argentina, Dubai, Japan, Korea, Vietnam, Thailand, Malaysia, Indonesia, Australia, Germany, France, Italy, Portugal etc. As a leading nanotechnology development manufacturer, RBOSCHCO dominates the market. Our professional work team provides perfect solutions to help improve the efficiency of various industries, create value, and easily cope with various challenges. If you are interested, please send an email to sales1@rboschco.com

Payment Term

T/T, Western Union, Paypal, Credit Card etc.

Shipment Term

By air, by sea, by express, as customers request.

5 FAQs of Alumina ceramic shaft

Q1:Why is it difficult to process alumina ceramic shafts?

 The difficulty in processing alumina ceramic shafts is mainly due to its high hardness, brittleness and anisotropy. Its hardness is second only to diamond, and it is difficult to cut with traditional tools and is easy to wear; it is brittle and easy to collapse, crack or even break during processing, especially in thin-walled, complex structures or small-hole processing; the directionality of grain growth during sintering leads to anisotropy of material mechanical properties, which is easy to cause uneven stress, and internal microcracks, pores and other defects will reduce material strength, resulting in a decrease in processing yield.

Q2:How to solve the brittleness problem in the processing of alumina ceramic shafts?

Use diamond tools or CBN grinding wheels for grinding and cutting; use ultrasonic assisted processing to reduce cutting force and reduce edge collapse; optimize processing parameters, such as reducing feed speed and increasing rotation speed to reduce stress concentration.

Q3:Why is the processing cost of alumina ceramic shafts so high?

 On the one hand, the processing of alumina ceramic shafts is difficult and requires expensive tools such as diamond tools or CBN grinding wheels, and these tools wear out quickly; on the other hand, the equipment required for precision processing, such as five-axis grinders and ultrafast lasers, has high investment and complex maintenance, leading to higher processing costs.

Q4:What is the difference between alumina ceramic shafts of different purities?

99% alumina ceramic shafts are usually used for small diameter shafts, mostly serving mid-end customers, with higher purity and performance; 95% alumina ceramic shafts are more used for large diameter shafts, mainly serving mid- and low-end customers, with relatively lower costs.

Q5:How to prevent surface spots on alumina ceramic shafts?

During compression molding, select high-quality raw materials with low iron content and perform magnetic separation to remove iron when necessary; pay attention to the grinding process, observe whether the lining bricks of the ball mill fall off and repair them in time; during granulation, add magnetic separation to remove iron when conveying slurry, and use hot air furnaces and hot air filters to prevent rust from entering the material in the hot air system. Magnetic separation is performed on granulated powder before the final product is packaged; all conveying pipelines should be lined with polyurethane as much as possible.