Silicon nitride ceramics (Si₃N₄) are structural ceramic materials with excellent properties, combining the toughness of metals with the high hardness of ceramics.
Its main features include:

• High strength and hardness: Vickers hardness exceeds 1500HV, which can withstand high load friction for a long time;

• Low density: only 40% of steel for lightweight design;

• Low thermal expansion coefficient: 3.2×10-⁶/K, excellent thermal stability;

• High Temperature and Corrosion Resistance: It can still maintain structural stability above 1200℃ and is not eroded by acid, alkali or molten metal.

Thanks to these properties, silicon nitride ceramics are ideal for precision bearings, mechanical seals, and wear-resistant components.

Silicon nitride ceramic bushing is a high-performance wear-resistant part used to support rotating shafts and reduce friction and wear. It is usually installed in the pump body, mechanical transmission system or valve body, playing the role of support, guidance and isolation.

• High abrasion resistance: high surface hardness and low wear rate can significantly extend the life of the equipment;

• Strong corrosion resistance: suitable for acid and alkali liquid, seawater or high humidity environment;

• Excellent thermal stability: can be operated at high temperature and high speed for a long time without deformation;

• Good self-lubricating performance: low coefficient of friction, can be used in less oil or dry friction environment.

Silicon nitride ceramic bushings are widely used:

• High-speed motors, mechanical spindles

• Chemical pumps, vacuum pumps, centrifugal equipment

• Automotive engines and turbine systems

• Aerospace machinery and precision instruments

It offers significant improvements in wear resistance, oxidation resistance and life cycle compared to conventional metal bushings.

In addition to silicon nitride ceramic bushings, we also provide a full range of high-performance silicon nitride ceramic parts to meet the needs of different industrial fields for wear resistance, high temperature resistance and high precision. The main products include:

• Silicon Nitride Ceramic Bearings: Suitable for high speed, high temperature, high load environment, low friction coefficient, long service life.

• Silicon Nitride Ceramic Bearing Balls / Silicon Nitride Ceramic Ball Bearings: Lightweight and wear-resistant, they can replace steel balls in precision machinery, aerospace and high-speed motors.

• All-ceramic silicon nitride bearings: no metal components, better corrosion and heat resistance.

• Used in chemical, slurry and high temperature fluid transportation systems.

• High hardness and abrasion resistance ensure long-term stable operation of the pipeline and reduce maintenance costs.

• Silicon Nitride Ceramic Gaskets: Provide insulation, anti-wear and high temperature protection.

• Effective in extending equipment life at high temperatures, high speeds or in corrosive environments.

• Silicon Nitride Ceramic Shafts: Lightweight, high rigidity, suitable for precision rotating equipment and high speed machinery.

• Silicon nitride ceramic gears: wear-resistant, anti-thermal shock, ensuring stable and reliable high-precision mechanical transmission.

• Combining silicon nitride ceramics with a metal substrate combines strength and wear resistance for industrial parts that are subjected to high mechanical stress.

Our silicon nitride ceramic product line covers bushings, bearings, balls, wear-resistant tubes, gaskets, shafts, gears, and composite parts, which can meet the needs of a wide range of applications in machinery, chemical, aerospace, semiconductor, and other industries, and provide a reliable material guarantee for high-performance equipment.

Silicon nitride ceramic bushings are made of high purity silicon nitride powder, prepared by isostatic pressure molding (CIP), hot press sintering (HPSN) or gas pressure sintering (GPSN).
Its key processing steps include:

• Precision grinding and polishing (surface roughness Ra≤0.02μm);

• Dimensional tolerance control (±0.002mm class);

• Dynamic balance calibration and coaxiality testing.

At the same time, metal clad structures or composite connectors can be customized according to customer needs to achieve a perfect fit with the metal system.

Silicon nitride ceramic bushings are far superior to metal bushings in terms of wear resistance, light weight and resistance to thermal shock, making them the upgrade of choice for high-performance mechanical systems.

1. Highly reliable operation: remains stable at high speeds and high loads;

2. Extended equipment life: Reduced friction losses and less frequent maintenance;

3. Energy saving and consumption reduction: low coefficient of friction leads to higher transmission efficiency;

4. Strong corrosion resistance: can be used in acid, alkali, high humidity or marine environment;

5. Lightweight structure: the overall weight of the equipment is reduced by 20-40%, which improves the response speed.

As Shenzhen Zhihao Ceramics Co., Ltd, we specialize in the research, development and production of silicon nitride ceramics and related high-performance ceramic parts, with more than 10 years of industry experience. Choose us, you will get reliable quality assurance and perfect service support.

• Advanced Materials and Processes

  • The use of high-purity silicon nitride powder, combined with mature processes such as hot press sintering (HPSN) and reaction sintering (RBSN), ensures that the ceramic parts have high density, strong hardness and excellent wear resistance.

  • Precision grinding and polishing to achieve ±0.002mm grade tolerance** and ultra-clean surface to meet the needs of high-precision machinery.

• Full range of products and customization capabilities

  • The products cover silicon nitride ceramic bushings, silicon nitride ceramic bearing balls, silicon nitride ceramic ball bearings, silicon nitride ceramic wear-resistant tubes, silicon nitride ceramic gaskets, silicon nitride ceramic shafts, silicon nitride ceramic gears, and metal lining composite parts.

  • Support non-standard size, complex structure and OEM customization, flexible to meet the needs of different industrial equipment.

• High reliability and long-term stable supply

  • The products are strictly tested to ensure that each batch of ceramic parts is resistant to high temperature, abrasion, corrosion and long life.

  • Stable production capacity and well-established supply chain to support mass production and timely delivery.

• Extensive industry experience

  • Our services cover the machinery manufacturing, chemical equipment, aerospace, high-speed motor and semiconductor industries.

  • Deep understanding of customer needs, can provide technical selection, structure optimization, assembly guidance and other one-stop solutions.

• Brand reputation and after-sales protection

  • More than ten years of industry accumulation, with mature quality management system.

  • Provide professional pre-sale, in-sale and after-sale services to ensure that customer parts are used without worry.

When you choose us, you not only get high-performance silicon nitride ceramic parts, but also enjoy a full range of technical support and customized services to keep your equipment performing consistently over time in wear-resistant, high-temperature and high-precision applications.

With its excellent physical properties and stable and reliable structural performance, silicon nitride ceramic bushings are replacing traditional metal parts as key wear-resistant components in high-end equipment manufacturing. If you are looking for an industrial ceramic component with high strength, low wear and long life, welcome to contact us for customized solutions and technical support for silicon nitride ceramic bushings.