High precision and high quality silicon nitride ceramic ring

Overview of Silicon Nitride Ceramic Rings

Silicon Nitride Ceramic Rings is a high-performance ceramic product. It is made of silicon nitride as the main raw material through a special process. It has excellent properties such as high strength, high hardness, high-temperature resistance, corrosion resistance and oxidation resistance. At the same time, silicon nitride ceramic ring also has good wear resistance and thermal stability. Therefore, they are widely used in machinery, the chemical industry, electronics and other fields and can be used to manufacture bearings, seals, cutting tools and other key components.

Features of Silicon Nitride Ceramic Rings

Silicon Nitride Ceramic Rings have many outstanding features:

High strength and hardness: Silicon Nitride Ceramic Rings are extremely strong and hard, with their hardness second only to diamond and a few other substances. This enables them to maintain a stable shape and performance when subjected to extreme conditions such as high pressure and high-speed friction, and they are not susceptible to deformation or wear, so they can be used to manufacture high-load mechanical parts.

Good high-temperature resistance: Silicon nitride ceramic rings have excellent high-temperature resistance and can maintain good mechanical properties and chemical stability in high-temperature environments. It can withstand high temperatures above 1200℃ and will not soften under high temperatures like metal materials, so it is commonly used in aerospace, metallurgy and other high-temperature fields.

Strong chemical stability: Silicon nitride ceramic ring has excellent chemical stability and strong corrosion resistance to acids, alkalis and other chemicals. It can work stably for a long time in harsh chemical environments and does not easy to be corrode or dissolve, so it is suitable for corrosive environments such as chemical and pharmaceutical industries.

Good self-lubrication: Silicon nitride ceramic ring has a low coefficient of friction and good self-lubrication. This characteristic makes it possible to reduce friction loss in moving parts, improve mechanical efficiency, reduce energy consumption, and also extend the service life of parts.

High thermal conductivity: Silicon nitride ceramic rings have a high thermal conductivity, which enables them to transfer heat quickly and efficiently. This helps to dissipate heat in a timely manner in a high-temperature environment to avoid local overheating and ensure the normal operation of the equipment, which has an important application value in the field of electronics, electric power and other areas with high requirements for heat dissipation.

Specifications Table of Silicon Nitride Ceramic Rings

Item	Unit	Typical Values
Density	g/cm³	3.22
Hardness	HRA	90
Vickers Hardness (HV50)	HV0.5	>1550
Modulus of Elasticity	GPa	290
Flexural Strength	MPa	>600
Compressive Strength	MPa	2500
Fracture Toughness, K<sub>IC</sub>	MPa·m<sup>1/2</sup>	>6.0
Max. Use Temperature	°C	1200
Thermal Conductivity	W/m·K	15 – 20
Thermal Expansion Coefficient	10<sup>-6</sup>/°C	>3.1
Thermal Shock Resistance	ΔT °C	500
Specific Heat Capacity	kJ/kg·K	700
Volume Resistivity at 20°C	Ω·cm	1.0 x 10<sup>12</sup>

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Applications of Silicon Nitride Ceramic Rings

Silicon Nitride Ceramic Rings have a wide range of applications in many fields due to their unique properties:

Mechanical field: Silicon Nitride Ceramic Rings are often used in the manufacture of bearing balls and rings due to their high strength, high hardness and good wear resistance. They can withstand higher loads, reduce the coefficient of friction, and improve the precision and service life of bearings, which are especially suitable for high-speed and high-precision mechanical equipment. In addition, in mechanical seals, silicon nitride ceramic rings can achieve a good sealing effect, reduce leakage, and ensure the stable operation of the equipment under the harsh conditions of high temperature, high pressure and strong corrosion.

Chemical industry: The excellent chemical stability and corrosion resistance of silicon nitride ceramic rings make silicon nitride ceramic rings the ideal lining material for chemical pipelines, reactors and other equipment. It can effectively resist the erosion of various strong acids, alkalis and other chemical media, extend the service life of the equipment and reduce maintenance costs. At the same time, as a sealing ring used in chemical pumps, it can resist the scouring and corrosion of chemical media and ensure the efficient operation of the pump.

Electronic field: silicon nitride ceramic ring has good insulating properties and thermal conductivity, can be used for the manufacture of electronic components encapsulation materials, can effectively protect the electronic components from the influence of the external environment, and at the same time play a role in heat dissipation, to improve the performance and stability of electronic equipment. In addition, in semiconductor manufacturing equipment, silicon nitride ceramic rings can be used as parts of the wear-resistant coating or insulating parts to meet the high precision, high-reliability process requirements.

Aerospace field: the high temperature resistance, high strength and low density of silicon nitride ceramic rings make them used in the aerospace field. They can be used to manufacture hot-end parts of aviation engines, such as turbine blades and combustion chambers, etc. They can withstand the scouring and corrosion of high-temperature gas, improve the thermal efficiency and performance of the engine, and at the same time reduce the weight of the engine to enhance the fuel economy and flight performance of the airplane.

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

Shipment Term

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

5 FAQs of Silicon Nitride Ceramic Rings

Q1:What are the advantages of silicon nitride ceramic rings over metal materials?

The hardness of silicon nitride ceramic rings is more than three times that of bearing steel (HV1500-1800), and the density is only 40% of steel, which can significantly reduce the weight of equipment. Its high-temperature resistance of up to 1,400°C far exceeds the softening temperature of metal materials, and it excels in high-temperature components such as turbine blades for aero-engines. In addition, it is virtually invulnerable to corrosive environments such as acids and alkalis, whereas metallic materials are prone to oxidation or corrosion.

Q2: Why are silicon nitride ceramic rings more expensive?

The high cost of silicon nitride ceramic rings stems from the purity of the raw material (99.9% or more high-purity silicon powder is required) and the complex manufacturing process. For example, hot press sintering at temperatures above 1800°C and the addition of rare earth oxides (e.g., Y₂O₃) as sintering additives result in high energy and equipment costs. In addition, its high hardness requires the use of diamond tools for processing, which further increases the production cost.

Q3.:How to solve the problem of insufficient wear resistance of silicon nitride ceramic rings?

Despite their high hardness, silicon nitride ceramics may wear out due to brittle fracture under dynamic friction or impact loads. Wear resistance can be enhanced through material modification (e.g., grain size adjustment), surface coating (e.g., deposition of diamond films), or optimization of use conditions (avoiding high-speed sliding). For example, nanotechnology can improve their microstructure, reduce defects and increase toughness.

Q4.:Can silicon nitride ceramic rings replace traditional ceramic materials?

Compared to alumina ceramics, silicon nitride has 2-3 times the flexural strength (800-1200 MPa) and better thermal shock resistance (ΔT critical value > 800°C) for high-temperature environments. Its fracture toughness (6-9 MPa・m¹/²) is higher than that of silicon carbide, making it more suitable for components subjected to alternating stresses. However, in scenarios where electrical insulation is critical, alumina still has the advantage.

Q5:How stable are silicon nitride ceramic rings at high temperatures?

Silicon nitride can be used in air at temperatures of up to 1200°C for long periods of time, with a short-term resistance of 1600°C. Silicon nitride can be used in air at temperatures of up to 1200°C for long periods of time. At high temperatures, a dense SiO₂ oxide layer is formed on the surface, preventing further oxidation. However, at extremely high temperatures above 1400°C or in oxygen-rich environments, “reactive oxidation” may occur, generating volatile SiO gases that lead to material depletion and need to be avoided by coatings or atmosphere control.