High Precision Wear-resistant Silicon Nitride Ceramic Tubes

Overview of Silicon Nitride Ceramic Tubes

Silicon Nitride Ceramic Tubes are a kind of high performance ceramic tubes. It has excellent characteristics such as high strength, high hardness, high-temperature resistance, abrasion resistance and corrosion resistance. Its chemical stability is good and can resist the erosion of many chemicals. At the same time, silicon nitride ceramic tube also has good insulation properties and thermal stability. Therefore, it has a wide range of applications in many fields, such as machinery, chemical industry, metallurgy, electronics, etc. It can be used to manufacture high-temperature furnace tubes, thermocouple protection tubes, chemical piping and so on.

Features of Silicon Nitride Ceramic Tubes

Silicon Nitride Ceramic Tubes have the following significant features:

High Strength and Hardness: Silicon Nitride Ceramic Tubes are extremely strong and hard, and their hardness is second only to diamond and other super-hard materials. This makes it under high pressure, high-speed impact and high load working conditions, but it still can maintain good shape and performance, is not easy to deform and wear, and can be used to manufacture a variety of mechanical parts that need to be wear-resistant pressure-resistant.

Good high-temperature resistance: Silicon nitride ceramic tube has excellent high-temperature resistance and can maintain stable physical and chemical properties in high-temperature environments. It can withstand high temperatures up to 1600℃ and still has high strength at high temperatures, so it is widely used in high-temperature industrial fields, such as high-temperature furnace tubes and thermocouple protection tubes in metallurgy, glass manufacturing and other industries.

Good corrosion resistance: Silicon nitride ceramic tube has strong resistance to acid, alkali, salt and other chemicals, and it is not easy to be corroded. In the chemical and petroleum industries, it can be used to convey various corrosive media, which can effectively extend the service life of the equipment and reduce maintenance costs.

Excellent insulation performance: Silicon Nitride ceramic tube has good electrical insulation performance, can effectively prevent the passage of electric current, and can be used in electronic, electrical and other fields as an insulating component to ensure the safe operation of equipment.

Specifications Table of Silicon Nitride Ceramic Tubes

Property	Typical Value
Density	\(3.1 – 3.3 \text{ g/cm}^3\)1
Color	Grey, grey – black, or black
Mechanical Properties
Compressive Strength	\(2200 – 3000 \text{ MPa}\)2
Flexural Strength	\(650 – 900 \text{ MPa}\)24
Fracture Toughness	\(6 – 8 \text{ MPa}\cdot\text{m}^{1/2}\)4
Vickers Hardness	\(16 – 20 \text{ GPa}\)2
Young’s Modulus	\(290 – 320 \text{ GPa}\)2
Poisson’s Ratio	\(0.28\)
Thermal Properties
Maximum Temperature (Inert Gas)	\(1200 – 1400^{\circ}\text{C}\)5
Maximum Temperature (Air)	\(1000 – 1100^{\circ}\text{C}\)5
Thermal Conductivity (@\(20^{\circ}\text{C}\))	\(23 – 28 \text{ W/m}\cdot\text{K}\)24
Thermal Conductivity (@\(1000^{\circ}\text{C}\))	\(16 \text{ W/m}\cdot\text{K}\)
Thermal Expansion (\(20 – 100^{\circ}\text{C}\))	\(2\times 10^{-6} /\text{K}\)
Thermal Expansion (\(20 – 1000^{\circ}\text{C}\))	\(3.5\times 10^{-6} /\text{K}\)
Electrical Properties
Resistivity (@\(20^{\circ}\text{C}\))	\(10^{12} \text{ }\Omega\cdot\text{cm}\)
Resistivity (@\(800^{\circ}\text{C}\))	\(10^{7} \text{ }\Omega\cdot\text{cm}\)
Dielectric Constant\(6 – 8.2\)2	Dielectric Constant\(6 – 8.2\)2

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Applications of Silicon Nitride Ceramic Tubes

Silicon Nitride Ceramic Tubes have a wide range of applications in many fields due to their excellent performance; the following are some of the main aspects:

Mechanical engineering: Due to its high strength, high hardness and wear resistance, silicon nitride ceramic tubes are often used in the manufacture of high-speed cutting tools, bearing balls and rings. Silicon nitride ceramic tools enable high-speed cutting, improve machining efficiency and precision, and, at the same time, extend tool life. Bearings made of silicon nitride ceramics have good wear resistance and stability under high-speed, high-temperature and high-load working conditions, which can reduce friction loss and improve the performance and reliability of mechanical systems.

Electronic industry: using its good insulating properties and thermal stability, silicon nitride ceramic tube can be used as an insulating encapsulation material for electronic components, substrate materials, and semiconductor manufacturing in the gas transport pipeline. Insulation encapsulation material can protect electronic components from the influence of the external environment, to ensure their normal operation; substrate materials for electronic components to provide a stable support and electrical connection platform; and as a gas pipeline, can be in the semiconductor manufacturing process, the precise delivery of a variety of process gases, to ensure the stability and consistency of the production process.

Energy field: in the fuel cell and solar photovoltaic power generation and other fields, silicon nitride ceramic tube also plays an important role. In solid oxide fuel cells, silicon nitride ceramic tubes can be used as electrolyte supports or connectors, and their high-temperature stability and chemical stability help improve the performance and life of the battery. In solar photovoltaic power generation systems, they can be used to manufacture solar collector tubes, which can efficiently absorb solar energy and convert it into heat energy, and at the same time have good weathering and corrosion resistance to adapt to a variety of outdoor environments.

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 Silicon Nitride Ceramic Tubes

Q1:Why are Silicon Nitride Ceramic Tubes expensive?

The cost is mainly due to the high purity of the raw material (e.g., α-phase content > 92%), the complexity of the manufacturing process (e.g., high-temperature and high-pressure equipment is required for hot-pressure sintering) and the difficulty of machining (diamond abrasive tools are required). For example, hot isostatic pressing of silicon nitride ceramic ball mass production technology mastered by only a few enterprises, further pushing up the market price.

Q2:What is the long-term operating temperature of silicon nitride ceramic tubes?

The recommended operating temperature is not more than 1000℃ in air and up to 1400℃ in a protective atmosphere. More than 1200 ℃, the material strength will decline with time, and more than 1450 ℃ easy to fatigue damage. For example, when used in automobile engines, the operating temperature can be raised to 1300°C, which significantly improves thermal efficiency.

Q3: How are silicon nitride ceramic tubes installed and connected?

Usually flange connection is adopted, and care should be taken to avoid collision and surface damage. For high-temperature environments, brazing technology (such as SiTi22 alloy brazing material) can be used to realize metallurgical bonding and enhance the strength of the joint. Installation should be numbered and sealed to prevent leakage of media.

Q4.:What is the corrosion resistance of silicon nitride ceramic tubing?

Resistant to most inorganic acids (except hydrofluoric acid), caustic solutions up to 30%, and molten metals such as aluminum. In the chemical industry, its corrosion rate in boiling hydrochloric acid is extremely low, with a continuous operating life of more than two years.

Q5:What is the difference between silicon nitride ceramic tubes and alumina ceramic tubes?

Silicon nitride ceramics are harder (1500 HV on the Vickers scale), more resistant to thermal shock (coefficient of thermal expansion 3.1 x 10-⁶/°C), and have better thermal conductivity than alumina. Alumina ceramics are less costly but have poorer thermal conductivity and thermal shock resistance and are suitable for low- to mid-range scenarios.