Silicon Nitride Ceramic Plunger: High-Performance Component
Silicon Nitride Ceramic Plungers, crafted from high-performance silicon nitride ceramic material, offer advantages such as high strength, high hardness, high-temperature resistance, wear resistance, and excellent chemical stability. They can maintain stable performance in various high-pressure, high-speed, and high-temperature working environments. This effectively reduces friction loss, extends service life, and improves equipment operating efficiency, making them widely used in chemical, petroleum, machinery, and other industrial fields.
Silicon Nitride Ceramic Plungers
Features of Silicon Nitride Ceramic Plungers
High Hardness and Wear Resistance: As one of the hardest materials, second only to diamond, silicon nitride ceramic plungers resist abrasion from media during frequent reciprocating motion. They maintain good surface finish and dimensional accuracy even under high-pressure and high-speed conditions, significantly extending service life.
Excellent High-Temperature Resistance: Silicon nitride ceramics can maintain stable mechanical properties in high-temperature environments, withstand high working temperatures, and resist thermal deformation. This makes them suitable for equipment operating in high-temperature conditions, such as chemical reactors and high-temperature, high-pressure pumps.
Strong Corrosion Resistance: With good chemical stability, silicon nitride ceramics resist most corrosive media, including acids, alkalis, and salts. They ensure normal equipment operation in the chemical and petroleum industries, reducing leakage and failure caused by corrosion.
Specifications of Silicon Nitride Ceramic Plungers
| Parameter |
Typical Value |
| Material |
Si₃N₄ |
| Density (g/cm³) |
3.2 - 3.3 |
| Flexural Strength (MPa) |
700 - 900 |
| Young's Modulus (GPa) |
300 |
| Poisson's Ratio |
0.25 - 0.28 |
| Compressive Strength (MPa) |
2500 - 3000 |
| Hardness (GPa) |
15 - 16 |
| Fracture Toughness (MPa·m¹/²) |
5 - 8 |
| Maximum Working Temperature in Oxidizing Atmosphere (℃) |
1100 - 1300 |
| Maximum Working Temperature in Neutral Atmosphere (℃) |
1600 |
| Thermal Conductivity (W/m·K) |
20 - 25 |
| Thermal Expansion Coefficient (/℃) |
3×10⁻⁶ - 3.1×10⁻⁶ |
| Thermal Shock Resistance (ΔT ℃) |
550 - 800 |
| Surface Roughness |
Ra 0.02 μm (after polishing) |
| Cylindricity Tolerance |
±0.006 mm |
| Concentricity Tolerance |
±0.002 mm |
|
Applications of Silicon Nitride Ceramic Plungers
Chemical Industry: Used in chemical pumps and plunger valves, silicon nitride ceramic plungers can stably convey corrosive liquids such as sulfuric acid, hydrochloric acid, and sodium hydroxide solutions, ensuring the safety and stability of chemical production processes.
Petroleum Field: In water injection pumps and mud pumps, silicon nitride ceramic plungers withstand high temperatures, high pressures, and sand-containing impurities in wells, improving oil extraction efficiency and reducing equipment maintenance costs.
Mechanical Field: In precision injection molding machines and high-pressure hydraulic systems, these plungers achieve precise pressure control and stable movement, enhancing processing accuracy and product quality while extending equipment life.
New Energy Field: In hydrogen transfer pumps of fuel cells, silicon nitride ceramic plungers operate stably in high-pressure, high-purity hydrogen environments, ensuring the reliable operation of new energy equipment.
Company Profile
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and nanomaterials, including boride powder, nitride powder, graphite powder, ceramic products, 3D printing powder, etc.
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 Ceramic Products please feel free to contact us or click on the needed products to send an inquiry.
Applications of Ceramic Products
Process of Ceramic Products
Payment Term
T/T, Western Union, Paypal, Credit Card etc.
Shipment Term
By air, by sea, by express, as customers request.
5 FAQs About Silicon Nitride Ceramic Plungers
Q1: What precautions should be taken when installing a silicon nitride ceramic plunger?
Clean the mating surface with alcohol to avoid particle scratches.
Control the coaxiality error between the plunger and pump body within ±0.005mm.
Use high-temperature grease with molybdenum disulfide and avoid running without lubrication.
Increase temperature slowly (≤10℃/min) at startup to prevent thermal stress cracking.
Q2: How to extend the service life of silicon nitride ceramic plungers?
Apply laser micro-weaving + ALD coating technology to reduce wear rate.
Conduct regular inspections and replace damaged parts promptly.
Install a 10μm filter at the pump inlet to minimize hard particle intrusion.
Use the Gas Pressure Sintering (GPS) process to improve product density and fracture toughness.
Q3: Do silicon nitride ceramic plungers meet international standards?
Domestic standards: Complies with GB/T 41490 - 2022 and GB/T 31703 - 2015.
International standards: Passed ISO 17947:2023 and FDA food contact certification.
Q4: Are silicon nitride ceramic plungers fragile?
Clarification: With a fracture toughness of 5 - 7MPa・m¹/², silicon nitride ceramics are 3 - 5 times tougher than common ceramics and are not easily broken during normal use. Avoid shock loads.
Impact-resistant design: A gradient composite structure (e.g., Si₃N₄/WC - Co transition layer) reduces thermal stress by 70%.
Q5: Are silicon nitride ceramics environmentally friendly?
Material advantages: No heavy metal pollution, recyclable, and compliant with EU RoHS directives.
Production process: Pressureless sintering technology consumes 60% less energy than metal smelting.
Application value: Self-lubricating design reduces lubricant use and the environmental impact of equipment maintenance.
