High quality corrosion resistant boron nitride ceramic shaft

Overview of Boron Nitride Shafts

Boron Nitride Shafts are shaft parts made of boron nitride. Boron nitride has a variety of excellent characteristics, such as high hardness, second only to diamond; good thermal stability, which can maintain stable performance at high temperatures; chemical stability, which does not easy to be corroded; and good electrical insulation. Therefore, Boron Nitride Shafts are characterized by high precision, high wear resistance, good thermal conductivity, etc. They can maintain stable positioning accuracy and mechanical properties under severe conditions such as high speed, high temperature, heavy load, etc., and are commonly used in machine tools, optical instruments, aerospace and other fields with high requirements for precision and stability.

Features of Boron Nitride Shafts

Boron Nitride Shafts have the following features:

High hardness and wear resistance: Boron nitride shafts are extremely hard, especially those made of cubic boron nitride, with a hardness of up to about 9.5 on the Mohs hardness scale, second only to diamond. This gives it excellent wear resistance ability to withstand high-speed, heavy-duty working conditions, effectively reducing wear and prolonging service life; especially suitable for processing such as high-speed steel, titanium alloys and other difficult-to-machine materials.

Good thermal stability: boron nitride shafts can maintain stable performance in high-temperature environments; in the inactive reducing atmosphere, the use of temperature is up to 2800 ℃; in the oxidizing atmosphere, the maximum use of temperature is 900 ℃. At the same time, boron nitride shafts have a low coefficient of thermal expansion, which can maintain small dimensional changes during temperature changes and reduce deformation and cracking caused by thermal stress.

Excellent chemical stability: boron nitride shaft has the nature of chemical erosion resistance, not eroded by inorganic acids and water, and not easy to be corroded by alkali; in most chemical environments can remain stable, can be used in the chemical industry, semiconductors, and other fields that require high chemical stability of materials.

Excellent electrical insulation: boron nitride is a good electrical insulator, can effectively prevent the passage of electric current, avoid short-circuit leakage and other problems, and can be used in electrical equipment with requirements for electrical insulation performance.

Good thermal conductivity: Some types of boron nitride, such as hexagonal boron nitride, have high thermal conductivity, which is conducive to heat dissipation and can play a role in some equipment that requires good heat dissipation to help maintain the normal operating temperature of the equipment.

Specifications table of Boron Nitride Shafts

Property	Typical Value	Unit	Remarks
Material	Hexagonal boron nitride (h – BN) / Cubic boron nitride (c – BN)	–	h – BN has good lubricity, thermal conductivity, and electrical insulation; c – BN has high hardness and excellent thermal stability.
Density	1.9 – 3.49	g/cm³	1.9 g/cm³ for h – BN; 3.49 g/cm³ for c – BN1.
Hardness	25 – 205 Knoop (h – BN) 210 – 390 Knoop (c – BN)	–	-35.
Modulus of Elasticity	20.6 – 103 GPa	–	20.6 GPa perpendicular to the pressing direction for h – BN; 41.0 – 103 GPa for c – BN3.
Flexural Strength	17.2 – 290 MPa	–	17.2 MPa perpendicular to the pressing direction for h – BN; 52.0 – 290 MPa for c – BN3.
Electrical Resistivity	≥1.0×10¹² – ≥3.0×10¹⁴ Ω·cm	–	-3.
Dielectric Constant	4.08 – 4.1	–	-3.
Thermal Conductivity	20 – 602.6 W/m·K	–	20 – 28 W/m·K for h – BN; 602.6 W/m·K in the “a” direction for pyrolytic boron nitride3.
Coefficient of Thermal Expansion	0.4 – 4.80 µm/m·°C	–	0.4 – 0.8 µm/m·°C for h – BN perpendicular to the pressing direction; 4.80 µm/m·°C for c – BN3.
Max Service Temperature in Air	850 – 985 °C	–	850 °C for h – BN; 985 °C for c – BN3.
Max Service Temperature in Inert Atmosphere	2000 – 3000 °C

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Applications of Boron Nitride Shafts

Boron Nitride Shafts have a wide range of applications in many fields due to their unique properties:

Machining: Boron Nitride Shafts are often used as spindles in high-precision machine tools due to their high hardness and wear resistance. It can maintain good precision and stability in the case of high-speed rotation and withstand large cutting forces, ensuring the dimensional accuracy and surface quality of machined parts. For example, in aerospace parts processing, boron nitride shafts can be used for processing engine blades, landing gears and other key components to meet their requirements for high precision and high performance.

Electronic industry: Boron nitride shafts’ good electrical insulation and thermal stability make them used in the manufacture of electronic equipment. In semiconductor manufacturing equipment, such as ion implanter, photolithography, etc., boron nitride shafts can be used as precision transmission parts, which can ensure the electrical insulation performance of the equipment but also maintain stability in long-time high load operation, ensure the high-precision positioning of the equipment and motion control, and help to improve the manufacturing precision and yield of semiconductor chips.

Chemical field: Its excellent chemical stability makes boron nitride shafts suitable for some special environments in chemical production. For example, in corrosion-resistant pumps and agitators, boron nitride shafts are able to resist the erosion of various chemical media, ensure the normal operation of the equipment, prolong the service life of the equipment, reduce the maintenance cost, and are especially suitable for chemical processes that deal with corrosive liquids, such as strong acids and strong alkalis.

Optical instrument field: the high precision and stability of boron nitride shafts are crucial for optical instruments. In telescopes, microscopes and other optical instruments, boron nitride shafts can be used to support and drive optical components, such as lenses, mirrors, etc., to ensure their precise positional adjustments and stable attitudes, thus improving the imaging quality and resolution of optical instruments.

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

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5 FAQs of Boron Nitride Shafts

Q1: How to maintain the boron nitride shaft?

Cleaning and maintenance: Regularly clean the shaft surface with anhydrous ethanol or ultrasonic wave to avoid dust and oil from affecting the accuracy.

Lubrication management: Use boron nitride grease (temperature resistant 900℃) in high-temperature environments to reduce friction and wear.

Installation Note: Ensure the coaxiality error of shaft and bearing ≤ 0.002mm, avoid eccentric load. Adopt a flexible coupling connection to cushion vibration and shock.

Q2: What is the service life of boron nitride shafts?

Normal working condition: the life of cubic boron nitride shaft can reach 500-1000 hours in high speed cutting, and the life of hexagonal boron nitride shaft exceeds 2000 hours in high temperature lubrication scenario.

Influencing factors: Load, temperature, lubrication conditions, and hardness of the material being machined are the primary influencing factors. For example, when machining titanium alloys, life can be reduced by 30-50%.

Q3: Why are boron nitride shafts more expensive?

Expensive material: The price of cubic boron nitride powder is about 500-1000 RMB/kg, which is 5-10 times higher than that of cemented carbide.

Complex process: High-temperature sintering and precision machining increase the manufacturing cost; e.g., the CVD process for pyrolytic boron nitride shafts accounts for 40% of the cost.

Small market scale: limited demand for high-end applications (e.g. aerospace), difficult to scale down costs.

Q4: What are the market trends for boron nitride shafts?

Technology upgrade: R&D of nano-twinned cubic boron nitride material (hardness of 108 GPa, oxidation resistance temperature of 1294℃), which promotes performance improvement.

Application expansion: the demand for boron nitride shafts with high thermal conductivity and resistance to extreme environments is growing in new energy vehicles, 5G communications and other fields, and the market size is expected to reach 277 million U.S. dollars in 2025.

Q5: Can boron nitride shaft replace ceramic shaft?

In high-speed, high-temperature, and high-corrosion scenarios, boron nitride shafts have better performance but at a higher cost. Under normal working conditions, ceramic shafts are more cost-effective.