High temperature resistant, corrosion-resistant, wear-resistant silicon nitride ceramic nozzle

Silicon nitride ceramic nozzle (Si ∝ N ₄ ceramic nozzle) is a high-performance industrial nozzle prepared from high-purity silicon nitride (Si ∝ N ₄) through advanced ceramic molding and sintering processes. With its excellent high temperature resistance, corrosion resistance, and high wear resistance, it has become the core component of injection systems in fields such as petroleum, chemical, metallurgy, and environmental protection, especially suitable for efficient and stable operations under extreme working conditions.

Core material advantages
Characteristics of Silicon Nitride (Si ∝ N ₄)
High temperature resistance: With a melting point of up to 1900 ℃, it can work stably in environments above 1200 ℃ for a long time and withstand high temperatures of 1400 ℃ for a short time.
Corrosion resistance: It has strong chemical inertness to acids, bases, salts, and organic solvents, and can resist almost all corrosive media except HF acid.
High wear resistance: Mohs hardness level 9, second only to diamond, low friction coefficient, far exceeding the lifespan of metal or oxide ceramic nozzles.
Thermal shock stability: Excellent thermal shock resistance, suitable for sudden cooling and heating conditions, and not easy to crack.
Insulation: Volume resistivity>10 ¹⁴Ω· cm, suitable for electrostatic sensitive or high-voltage environments.
Comparative advantages of materials
Performance indicators: silicon nitride ceramic, metal nozzle, aluminum oxide ceramic
The maximum working temperature is 1400 ℃, below 600 ℃, and 1200 ℃
Corrosion resistance: Strong acid/alkali/organic solvents are prone to corrosion. Acid/alkali resistant, but susceptible to strong acid erosion
Excellent wear resistance (diamond grade), generally better
Thermal conductivity 30 W/(m · K) high (≥ 100 W/(m · K)) 25 W/(m · K)
Density 3.2 g/cm ³ 7.8~8.9 g/cm ³ 3.9 g/cm ³

Product Design and Process
Structure Design
Channel optimization: CFD simulation is used to design the channel shape, reduce turbulence and pressure loss, and improve injection efficiency.
Surface smoothness: Ra ≤ 0.2 μ m mirror polished to reduce the risk of medium adhesion and blockage.
Dimensional accuracy: Through precision mold forming and diamond grinding, the tolerance is controlled within ± 0.01mm.
Interface customization: Supports multiple connection methods such as threads, flanges, clamps, etc., to adapt to different devices.
manufacturing process
Powder synthesis: Ultra fine silicon nitride powder (D50<0.5 μ m) is prepared using high-purity silicon powder nitriding method or vapor deposition method.
Molding technology: gel injection molding or isostatic pressing molding to ensure uniform and dense green body.
Sintering process: Gas pressure sintering (GPS) or hot pressing sintering (HP), with a density of ≥ 99% and almost no pores.
Post processing: laser drilling, precision grinding, ultrasonic cleaning to ensure the accuracy and cleanliness of the flow channel.

Key performance parameters
Detailed indicators for parameter categories
Long term use of working temperature: ≤ 1300 ℃; Short term limit: 1400 ℃
Corrosion resistant media include aqua regia, hydrofluoric acid (requiring special coating), concentrated sulfuric acid, sodium hydroxide, molten salt, etc
Hardness (Mohs) Level 9 (HV ≥ 2200)
Bending strength ≥ 800 MPa (20 ℃); ≥ 450 MPa（1200℃）
Thermal conductivity 30~35 W/(m · K) (20 ℃)
Friction coefficient and steel friction: 0.15 (dry friction); Grinding with ceramics: 0.05 (lubrication)
Thermal shock resistance Δ T=800 ℃ (no cracks after 100 cycles)
Size range: Inner diameter: 0.1~50mm; Length: 5-500mm (customizable)

Typical application scenarios
Chemical industry field
Corrosion resistant spray: Transporting highly corrosive liquids such as concentrated sulfuric acid and sodium hydroxide, replacing alloy nozzles, and increasing lifespan by more than 10 times.
Reactor spray: The medium inside the high-temperature and high-pressure reactor is evenly distributed to avoid local overheating or corrosion.
Metallurgical Industry
Continuous casting nozzle: Uniform spraying in the secondary cooling zone of molten steel to improve the quality of castings.
Aluminum electrolytic cell: High temperature molten electrolyte transportation, resistant to hydrogen fluoride gas corrosion.
Environmental Protection Equipment
Denitrification nozzle: ammonia water atomization spray, suitable for high temperature flue gas environment, reduces catalyst blockage.
Sludge drying: High wear-resistant nozzles treat sandy sludge, reducing maintenance frequency.
Thermal spraying and 3D printing
Powder conveying nozzle: resistant to high temperature wear, suitable for precise spraying of metal powder and ceramic powder.

Customized services
Material modification: Adding SiC, ZrO ₂ and other second phase reinforcement and toughening materials to adapt to special working conditions.
Coating development: Surface deposition of HfN and Al ₂ O3 nano coatings to enhance oxidation resistance or lubricity.
Channel simulation: Provide CFD optimized design solutions based on medium characteristics and customer processes.

Silicon nitride ceramic nozzles redefine spraying solutions for high temperature, corrosive, and wear environments with ultimate material performance and precise design and manufacturing. Whether it is improving equipment lifespan, reducing maintenance costs, or optimizing process efficiency, it brings revolutionary upgrades to industrial jet systems. If you need detailed technical parameters or case consultation, please feel free to contact us for customized solutions!