Silicon nitride ceramic gears

Silicon Nitride Ceramic Gear Product Introduction

Silicon nitride ceramic (Si₃N₄) is a compound composed of silicon and nitrogen elements, prepared through a high-temperature sintering process. This material possesses the following remarkable characteristics:

1. High-temperature stability:  It has a melting point of up to 1900℃ and can be used for extended periods at 1400℃ in an oxidizing atmosphere, and even up to 1850℃ in a reducing environment.

2. Mechanical strength: The flexural strength can reach 600-700 MPa under hot pressing, and the strength does not decrease even when heated to 1200-1350℃.

3. Corrosion resistance: It exhibits extremely strong resistance to most inorganic acids (such as hydrochloric acid, sulfuric acid, and nitric acid) and sodium hydroxide solutions with concentrations below 30%.

4. Self-lubricating properties: It has a very low coefficient of friction (which can be less than 0.5 after break-in), and the increase is minimal under high-temperature and high-speed conditions.

5. Lightweight: The density is only 3.2-3.3 g/cm³, which is 60% lighter than steel.

6. Electrical insulation: The resistivity at room temperature reaches 10¹⁵-10¹⁶ Ω, and the dielectric constant is stable at 9.4-9.5.

Product Features

1. High Hardness and Wear Resistance: Vickers hardness reaches 1400-1700 HV, second only to a few superhard materials.

2. Low Density and High Rigidity: Low density (~3.2-3.3 g/cm³) and high elastic modulus (~300 GPa).

3. Excellent Fracture Toughness: Through microstructure optimization, the fracture toughness can reach 6-8 MPa·m¹/².

4. Dimensional Stability: The thermal expansion coefficient is approximately 3.2×10⁻⁶/K, and it exhibits good isotropy.

5. Chemical Stability: It has good resistance to most oils and chemical media.

6. Long Lifespan: It reduces friction loss during high-speed operation, extending the lifespan by more than 5 times compared to traditional metal gears.

Application Fields

Silicon nitride ceramic gears have a wide range of applications in several high-end fields:

1. Aerospace: Engine turbine blades, combustion chambers, seals, etc.

2. Mechanical manufacturing: Bearings, gears, cutting tools, and other precision components.

3. Chemical industry: Ball valves, pump bodies, burners, and other corrosion-resistant parts.

4. Semiconductor industry: Thin-film capacitors, high-temperature insulators, radar radomes, etc.

5. New energy vehicles: Insulating substrates in electric drive systems.

Supports custom specifications.