Introduction of Silicon Nitride Tubes

Silicon Nitride Tubes are high-performance ceramic tubes made of silicon nitride (Si₃N₄) with excellent resistance to heat, abrasion, and chemical stability. Silicon nitride is an advanced engineering ceramic material known for its high hardness, high strength, and thermal shock resistance. Widely used in high-temperature, corrosive, and highly abrasive industrial applications, silicon nitride tubing is an efficient, durable, and reliable engineering component.

Features of Silicon Nitride Tubes

High hardness and abrasion resistance: the high hardness of silicon nitride can effectively resist abrasion and prolong service life.

Excellent high-temperature resistance: able to work stably in high-temperature environments above 1200°C.

Thermal shock resistance: able to withstand rapid temperature changes and suitable for frequent heating and cooling conditions.

Chemical stability: extremely resistant to acids, alkalis, and most molten metals.

Low density: low density (about 3.2 g/cm³) reduces equipment loads and is suitable for high-speed rotary applications.

High mechanical strength: high flexural strength and fracture toughness, able to withstand large mechanical stresses.

Electrical insulation: maintains good electrical insulation properties at high temperatures, suitable for electronic and electrical applications.

Low thermal conductivity: good thermal insulation properties, reducing heat loss and improving energy efficiency.

Parameters of Silicon Nitride Tubes

Property	Specification
Material Composition	Si₃N₄ (Silicon Nitride)
Density	~3.20 g/cm³
Hardness (Vickers)	~1500-1800 HV
Fracture Toughness	~6-7 MPa·m½
Young’s Modulus (Elastic Modulus)	~280-320 GPa
Compressive Strength	~3000-4000 MPa
Flexural Strength (Bending Strength)	~800-1000 MPa
Coefficient of Thermal Expansion	~3.2 × 10⁻⁶ /°C (at room temperature to 1000°C)
Thermal Conductivity	~25-35 W/m·K
Max Service Temperature in Air	Up to 1200°C (continuous), up to 1400°C (intermittent)
Chemical Resistance	Excellent resistance to acids, alkalis, and molten metals
Electrical Resistivity	High (>10¹² Ω·cm at room temperature)
Wear Resistance	Excellent, suitable for high-wear applications
Thermal Shock Resistance	Outstanding, capable of withstanding rapid temperature changes
Corrosion Resistance	Superior, especially in aggressive environments
Self-Lubricating Properties	Reduces friction in moving parts
Biocompatibility	Suitable for medical applications
Environmental Impact	Environmentally friendly, no harmful substances
Tube Dimensions	Inner diameter, outer diameter, and length can be customized based on application requirements

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Applications of Silicon Nitride Tubes

High-temperature industry: for high-temperature furnace tubes, thermocouple protection tubes and molten-metal-handling equipment; in aerospace, for heat-protection components and engine assemblies.

Electronics and semiconductor industries: for insulating and support tubes in semiconductor manufacturing equipment; as heat-resistant components in high-temperature furnaces and vacuum equipment.

Chemical industry: for reaction and transportation pipes in corrosive media; as corrosion-resistant components in high-temperature catalytic reaction and exhaust gas treatment equipment.

Energy sector: electrolyte tubes for solid oxide fuel cells (SOFC) as high-temperature-resistant support and insulation components in solar and nuclear energy equipment.

Machinery and tools industry: for wear-resistant components in high-precision machinery and equipment, such as bearings, guide rails and cutting tools; as wear-resistant wire guide tubes and guide rollers in the textile and paper industries.

Medical and laboratory equipment: used as support tubes and reaction tubes for high-temperature experimental equipment; in medical equipment, as high-temperature and corrosion-resistant components, such as dental tools and surgical instruments.

Environmental protection field: used as high temperature and corrosion resistant tubes in exhaust gas treatment and catalytic reaction; as corrosion resistant delivery tubes in sewage treatment.

Company Profile

RBOSCHCO is a trusted global chemical material supplier & manufacturer with over 12 years experience in providing super high-quality chemicals and Nanomaterials.

The company has a professional technical department and Quality Supervision Department, a well-equipped laboratory, and equipped with advanced testing equipment and after-sales customer service center.

If you are looking for high-quality Silicon Nitride Tubes please feel free to contact us or click on the needed products to send an inquiry. 

Payment Term

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

Packing and Storage

The product is in powder form and should be stored in a cool, ventilated place. Avoid inhalation when using it and keep away from open flames, heat sources, etc.

Shipment Term

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

FAQs of Silicon Nitride Tubes

Question 1: What are the main application areas for silicon nitride tubes?

Answer: Silicon nitride tubes are widely used in the following areas due to their unique properties: high-temperature furnaces and heating elements: silicon nitride tubes are able to withstand extremely high temperatures (up to 1400°C or more), and are suitable for use in the manufacture of electric heating elements or as a protective casing; the chemical industry: used in piping systems for the transportation of corrosive chemicals because silicon nitride has excellent resistance to acid and alkali corrosion; semiconductor manufacturing: used as gas transportation piping during wafer Semiconductor manufacturing: used as gas transportation piping during wafer processing to ensure a contamination-free environment; Aerospace: used as heat shields or conduits in engine components to effectively resist extreme temperature variations; Metallurgy and foundry: used as components of molten metal transportation systems, such as pouring tubes and nozzles, that can withstand high temperatures and wear and tear.

QUESTION 2: What are the advantages of silicon nitride tubing over traditional ceramic tubing?

Answer: Silicon nitride tubes have several significant advantages over traditional ceramic tubes: higher strength and hardness: the high strength and hardness of the silicon nitride material itself makes it more durable and especially suitable for harsh operating conditions; better thermal shock resistance: it maintains its structural integrity even in the face of rapid temperature changes, reducing the risk of thermal cracking; lower density: compared with traditional ceramics such as alumina, silicon nitride tubes are lighter, helping to reduce equipment weight; excellent abrasion resistance: performs well in high-speed abrasive environments, extending service life; good chemical stability: highly resistant to most chemicals, reducing the potential for corrosion.

Question 3: What is the role of silicon nitride tubing in the electronics and semiconductor industries?

Answer: In the electronics and semiconductor industries, silicon nitride tubes are mainly used in the following areas: insulation and support: used as insulating and supporting tubes in semiconductor manufacturing equipment to ensure stable operation of the equipment; high-temperature furnace tubes: used as high-temperature-resistant components in high-temperature furnaces and vacuum equipment for crystal growth and material sintering; precision machining: used as components in high-precision machining equipment for the cutting and grinding of semiconductor materials.

Question 4: Can silicon nitride tubes withstand rapid temperature changes?

Answer: Silicon nitride tubes have good thermal shock resistance and are able to maintain structural stability in the face of rapid temperature changes. This is because silicon nitride possesses a low coefficient of thermal expansion and high fracture toughness to effectively resist stresses caused by temperature fluctuations. However, despite this, extreme temperature fluctuations should be avoided as much as possible, especially during cold starts or sharp stops, to prevent potential thermal cracking. To optimize this characteristic, the rate and magnitude of temperature changes can be managed through precise design and operation.

QUESTION 5: Silicon nitride tubes are costly, how do I evaluate their cost effectiveness?

Answer: Although the cost of silicon nitride tubing is relatively high, the following aspects should be considered when evaluating its cost-effectiveness: long life: the high strength and durability of silicon nitride tubing means they can operate in harsh environments for long periods of time without frequent replacement, reducing maintenance costs; low maintenance requirements: due to their excellent wear resistance and chemical stability, silicon nitride tubing requires little additional protection, reducing the High-performance performance: In high-temperature, high-pressure or corrosive environments, silicon nitride tubes offer stability that is unmatched by other materials, ensuring process continuity and reliability; Lightweight design: Compared to metal or other ceramic materials, the low density of silicon nitride tubes helps reduce overall weight, which is especially important for certain applications (e.g., aerospace); and Total Cost of Ownership (TCO): Despite the higher initial investment, silicon nitride tubes tend to offer a lower total cost of ownership, taking into account the factors mentioned above, as well as savings over the long run.