High quality polished silicon nitride ceramic rods

Overview of Silicon Nitride Ceramic Rods

Silicon Nitride Ceramic Rods are a kind of high performance ceramic material products. They are characterized by high strength and high hardness and can withstand large external forces and resist abrasion. At the same time, Silicon Nitride Ceramic Rods have good resistance to high temperatures and corrosion and remain stable in harsh environments. In addition, Silicon Nitride Ceramic Rods have excellent insulating properties and a low coefficient of thermal expansion, which makes them a new material with great potential for use in a wide range of mechanical, electronic, and chemical applications.

Features of Silicon Nitride Ceramic Rods

Silicon Nitride Ceramic Rods have the following significant features:

High strength and hardness: Silicon Nitride Ceramic Rods have extremely high strength and hardness, and their hardness is second only to a few super-hard materials such as diamond. This makes it excellent in wear and impact resistance, able to withstand large external forces and pressures, not easy to deform and damage and can be used to manufacture parts under high loads and high wear environments.

Good high-temperature resistance: Silicon nitride ceramic rods have excellent high-temperature resistance and can maintain good mechanical properties and chemical stability in high-temperature environments. It can withstand high temperatures up to 1600℃, and it is not easy to soften and deform under high temperatures, so it is commonly used in aerospace, metallurgy and other high-temperature fields.

Strong corrosion resistance: silicon nitride ceramic rods have excellent corrosion resistance to acids, alkalis and other chemicals and are not easily eroded by corrosive media. This characteristic makes it able to work stably for a long time in harsh chemical environments in chemical and electronic industries.

Good insulation: silicon nitride ceramic rod is an excellent electrical insulation material, with high resistivity and low dielectric constant, it can effectively prevent the passage of electric current and can be used for the manufacture of electronic components in the insulating parts to protect the safe operation of electronic equipment.

Low coefficient of thermal expansion: Silicon nitride ceramic rods have a low coefficient of thermal expansion, and their dimensional changes are relatively small when the temperature changes. This feature makes it possible to reduce the stress caused by the difference in thermal expansion when used with other materials in a high-temperature environment, thus improving the reliability and stability of the components.

Specifications table of Silicon Nitride Ceramic Rods

Property	Unit	Value
Color	–	Black – gray
Density	g/cm³	3.21
Compressive strength	MPa	3000
Flexural strength	MPa	800
Weibull modulus	–	15
Fracture toughness \(K_{Ic}\)	MPa·m¹/²	6.5
Young’s modulus E	GPa	320
Poisson’s ratio	–	0.28
Vickers hardness (HV 1)	GPa	16
Maximum temperature in inert gas	℃	1200
Maximum temperature in air	℃	1100
Thermal conductivity at 20℃	W/m·K	28
Thermal conductivity at 1000℃	W/m·K	16
Thermal expansion coefficient (20 – 100℃)	10⁻⁶/K	2
Thermal expansion coefficient (20 – 1000℃)	10⁻⁶/K	3.5
Thermal shock parameter \(R_1\)	K	600
Thermal shock parameter \(R_2\)	W/mm	15
Resistance at 20℃	Ω·cm	10¹²
Resistance at 800℃	Ω·cm	10⁷
Dielectric constant (1 MHz)	–	6

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Applications of Silicon Nitride Ceramic Rods

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

Mechanical industry: Silicon Nitride Ceramic Rods can be used to make cutting tools, bearings and other components. Its high hardness and wear resistance make the tool keep sharp, prolong the service life, and improve cutting efficiency; used in the manufacture of bearings, it can withstand high loads, reduce the coefficient of friction, reduce energy loss, and improve stability and reliability of the mechanical system.

Electronic industry: Silicon nitride ceramic rods are ideal for manufacturing integrated circuit substrates and electronic packaging materials. Good insulating properties can ensure electrical isolation between electronic components to prevent short circuits; high thermal conductivity helps to quickly dissipate heat to ensure stable performance of electronic equipment in high power operation, reducing the risk of overheating damage.

Aerospace field: Due to the characteristics of high-temperature resistance, high strength and low density, silicon nitride ceramic rods can be used to manufacture hot-end parts of aviation engines, such as turbine blades and combustion chambers. They can withstand high-temperature gas washout, reduce engine weight and improve combustion efficiency, which in turn improves aircraft performance and fuel economy.

Chemical industry: Silicon nitride ceramic rods are commonly used to make corrosion-resistant pipes and reactor linings. Its excellent corrosion resistance can resist the erosion of various strong acids, alkalis and other chemical media to ensure the safety and stability of the chemical production process and reduce the maintenance and replacement costs of equipment.

New energy field: in the fuel cell, silicon nitride ceramic rods can be used as bipolar plate materials, using their good electrical conductivity, corrosion resistance and gas barrier to improve the performance and service life of the fuel cell. In addition, in the solar photovoltaic industry, it can also be used to manufacture ceramic wire saws for wafer cutting, improving cutting efficiency and wafer quality.

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 Rods

Q1: What is the density of silicon nitride ceramic rods? What are the advantages of metal?

The density of silicon nitride ceramic rods is 3.1-3.3g/cm³, which is only 1/3 of steel and 1.5 times of aluminum. The lightweight characteristics make it possible to significantly reduce the weight of equipment and improve energy efficiency in aerospace, new energy vehicles and other fields.

Q2: What is the production process of silicon nitride ceramic rods?

The main process includes:

Powder synthesis: silicon powder nitriding method or chemical synthesis method to prepare high-purity silicon nitride powder (purity ≥ 99.9%).

Molding: Cold isostatic pressing, injection molding or hot press molding to ensure uniform and dense blanks.

Sintering: Gas Pressure Sintering (GPSN) or Hot Isostatic Pressing (HIP) are commonly used to promote densification by adding sintering additives (e.g., Y₂O₃) to achieve a density of over 3.2g/cm³.

Post-treatment: precision grinding and polishing, dimensional accuracy up to ±0.003mm, surface finish Ra≤0.03μm.

Q3: How difficult is it to process silicon nitride ceramic rods? What are the problems that need to be paid attention to?

Silicon nitride has high hardness and brittleness; processing requires special techniques:

Cutting and grinding: Diamond tools or ultrasonic processing are used to avoid cracks caused by traditional metal processing methods.

Surface treatment: Rough grinding to remove residue, fine grinding and ultra-precision grinding to enhance accuracy need to control the grinding parameters to prevent surface damage.

Cost: Processing cost accounts for about 30%-50% of the total cost, complex shapes or high precision requirements will significantly increase the cost.

Q4: What is the service life of silicon nitride ceramic rods?

Conventional environments: Under conditions of less than 1200°C and no strong corrosion, the service life can be several years.

Extreme environments: High temperatures (>1200°C) or strong corrosion (e.g., hydrofluoric acid) will accelerate aging, and service life may be shortened to a few months.

Maintenance advice: Regular checking of surface wear and avoiding overloading and sudden temperature changes can extend service life.

Q5: What safety precautions should I take when using silicon nitride ceramic rods?

Temperature control: Avoid surface temperature exceeding 1200℃; the heat dissipation at the package end should be good, and the temperature should not exceed 400℃.

Mechanical protection: Handle gently, wear gloves to prevent scratches, and avoid collision with sharp objects.

Chemical protection: When contacting strong corrosive substances such as hydrofluoric acid, wear protective clothing and goggles.

Storage conditions: Store in a dry, dust-free environment; avoid direct sunlight and humidity.