Silicon Nitride Supplier
Silicon nitride has unique properties such as high strength, superior fracture toughness, thermal conductivity and excellent hardness. Zhen An provide silicon nitride raw materials in various forms, including silicon nitride blocks, silicon nitride powder, etc.
The content of some elements can be customized
Stable Quality Uniform Shape
Packaging: 1 Ton Jumbo Bag
100-200mm Customizable
Free Sample
Issuance Product Test Reports
China Supplier
Introduction to Silicon Nitride
Silicon nitride is a is an important ceramic material composed of silicon(59.4%) and nitrogen(38.2%). Si3N4 is the most thermodynamically stable of the silicon nitrides. It is a white, high melting solid that is relatively chemically inert. It has a melting point of approximately 2830°C and a density of 3.16 g/cm3. Silicon nitride’s high temperature properties are superior to most metals, combining high strength, creep resistance, and oxidation resistance.
The material is currently used in market segments such as reciprocating engine components and turbochargers, bearings, metal cutting and forming tools, and hot metal processing.
Shapes of Slicon Nitride
silicon Nitride Powder
Silicon nitride powder with very small particle sizes, usually at the nanoscale (nanoscale) or submicron scale
Silicon Nitride Specifications
| Product | Phase Ratio | Purity (%) | Particle D50 (μm) | Element content (%) | Impurity (ppm) | |||||
| N | O | C | Si free | Fe | Al | Ca | ||||
| SiN | β＞50% | 99.999 | ＜2.5 | ＞38.5 | ＜0.8 | ＜0.15 | ＜0.3 | ＜5 | ＜3 | ＜3 |
| SiN | β＞50% | 99.999 | ＜0.8 | ＞38.0 | ＜2.0 | ＜0.2 | ＜1.2 | ＜30 | ＜20 | ＜20 |
| SiN | α＞70% | 99.95 | ＜0.8 | ＞38.5 | ＜1.0 | ＜0.2 | ＜0.5 | ＜50 | ＜200 | ＜50 |
| SiN | α＞92% | 99.50 | ＜2.5 | ＞38.5 | ＜2.5 | ＜0.2 | ＜0.5 | ＜2000 | ＜2000 | ＜500 |
| SiN | α＞95% | 99.00 | ＜5.0 | ＞38.0 | ＜2.0 | ＜0.2 | ＜0.5 | ＜4000 | ＜4000 | ＜1000 |
| SiN | Amorphous | 97.00 | ＜50nm | ＞38.0 | ＜0.2 | ＜0.05 | N/A | ＜600 | ＜5 | ＜5 |
25 kg steel drums with polyethylene inlet.
(60 Liter) 8 drums on one pallet CP1
(1000×1200 mm)=1 Packaging-unit of 200 kg
Other packaging / quantity on request.
Zhen An silicon nitride powders are available in homogeneous lots up to 5 tons.
Storage and Handling: Storage and handling are subject to the rules and regulations in the country of use. Store in a closed container.
Remark：Other chemical composition and size can be supplied upon request.
Supply Ability: 300000 Metric Tons per month
Microstructure of Silicon Nitride
Silicon nitride is a solid compound that can be formed by a direct reaction between silicon and nitrogen. It occurs in three different phases characterized by their crystal structure, namely:
- The most common alpha and beta phases display a hexagonal crystal structure. Both phases are synthesized at normal pressure; the α phase is formed at low temperature and transforms to the β phase between 1,400 °C and 1,600 °C.
- The γ phase is only formed at high temperature and high pressure.
Properties of Silicon Nitride
| Compound Formula | N4Si3 |
| Molecular Weight | 140.28 |
| Appearance | odorless grey powder |
| Melting Point | 1900 °C, 2173 K, 3452 °F |
| Boiling Point | N/A |
| Density | 2.2 to 3.5 g/cm3 |
| Solubility in H2O | Insoluble |
| Refractive Index | 2.016 |
| Electrical Resistivity | 11 to 12 10x Ω-m |
| Poisson’s Ratio | 0.24 to 0.27 |
| Specific Heat | 720 to 800 J/kg-K |
| Thermal Conductivity | 12 to 31 W/m-K |
| Thermal Expansion | 2.5 to 3.2 µm/m-K |
| Young’s Modulus | 140 to 310 GPa |
| Exact Mass | 139.943 g/mol |
| Monoisotopic Mass | 139.943069 Da |
What Are The Applications Of Silicon Nitride?
Si3N4 has a wide range of applications in many fields, including steel smelting, refractory materials, reciprocating engine parts, bearings, metal processing, wear-resistant rubber, plastics, ceramics, etc.
steelmaking Industry:
Silicon nitride coating can effectively solve the oxidation and burning problems during the heat treatment of steel billets, and can reduce the 3%-5% oxide scale produced by ordinary hot-rolled plates to 0.1%-0.8%, and reduce the 1%-3% oxide scale produced by stainless steel hot-rolled plates to below 0.2%.
Silicon nitride as taphole slurry. Taphole slurry containing silicon nitride has a good effect on sintering activation, corrosion resistance, and crack resistance.
Metallurgical industry:
Due to the high temperature resistance, low friction coefficient and self-lubricating properties of silicon nitride, it is stable to most metal alloy solutions. Therefore, it can be used to manufacture tools and molds for metal material processing, such as mandrels, extrusion drawing dies, rollers, heating element fixtures, thermocouple sleeves, metal heat treatment brackets, crucibles, etc.
Combined with SiC as Si 3 N4-SiC refractory material for blast furnace body and other parts. It has good thermal shock resistance, will not be wetted by molten steel, and meets the process requirements of continuous casting.
Bearing Industry:
Silicon nitride is considered to be an extremely promising material for the manufacture of high-performance all-ceramic or steel-ceramic hybrid rolling contact bearings due to its excellent impact resistance compared to other ceramics.
Silicon nitride offers significant benefits by extending contact fatigue life due to its extremely high strength, toughness, and tolerance to chemical and thermal factors.
Aerospace:
In the aerospace industry, traditional materials such as metals and composites are often used in aircraft production. The need for new materials that can withstand extreme conditions has led to the use of silicon nitride in various aerospace applications.
Its mechanical robustness and high temperature performance make it a material of choice to replace traditional materials used in ball bearings, radomes and RF windows.
Silicon Nitride Production Process
The production process of silicon nitride mainly includes reaction sintering, hot pressing, atmospheric sintering, isostatic sintering and reaction re-sintering, among which reaction sintering is often used to produce silicon nitride refractory products.
In the process of reaction sintering to produce silicon nitride products, finely ground silicon powder (particle size is generally less than 80μm) is first formed by mechanical or isostatic pressing to form a green body.
Silicon powder contains impurities such as Fe, Ca, Al, and Ti, among which Fe acts as a catalyst to promote the diffusion of silicon, but it may also cause defects such as pores. The addition of an appropriate amount of Fe can promote nitridation reaction and sintering, but high content or excessive particles will cause product defects. Other impurities such as Al, Ca and Ti can form eutectics with silicon, and the addition of an appropriate amount can improve product performance.
Subsequently, the body is dried and placed in a nitrogen environment, heated to about 1350~1400℃ for sintering, and nitriding is performed at the same time. In this production method, raw material conditions, calcination process and atmosphere conditions play an important role in product performance.
The finer the silicon powder particle size, the larger the specific surface area, the lower the sintering temperature, and the higher the content of α-Si3N4 in the product. Appropriate silicon powder particle size can reduce the microscopic pore size and increase the product density.
Temperature has a significant effect on the nitriding rate. The nitriding reaction temperature starts at 970-1000°C and the rate increases at around 1250°C. Silicon is fusible at high temperatures, and it is necessary to avoid exceeding the melting point of silicon (1420℃).
FAQs About Silicon Nitride
Silicon nitride as a material that can withstand high temperatures and wear, it has a long service life, reducing the need for frequent replacements and contributing to a circular economy. Additionally, silicon nitride can be recycled and reused, reducing waste and environmental impact.
Factors that affect the color of silicon nitride powder may include:
Purity: The purity of silicon nitride powder will directly affect its color. High-purity silicon nitride powder usually presents a more uniform color.
Particle size: The particle size of silicon nitride powder will also affect its color performance. Silicon nitride powders of different particle sizes may present different colors.
Crystal structure: The crystal structure of silicon nitride powder will affect its color, and different crystal structures may present different colors.
Surface treatment: The surface treatment method of silicon nitride powder may also change its color. For example, coating, oxidation and other treatments will affect its color performance.
Preparation process: The preparation process of silicon nitride powder has an impact on its color, and different preparation processes may lead to color differences.
Additives: Other substances or compounds added during the production process may also affect the color of silicon nitride powder.
Lighting conditions: Lighting conditions may also affect the color performance of silicon nitride powder. Different light sources and lighting angles may cause it to present different colors.
Silicon nitride stands out among other ceramic materials due to its unique combination of properties: High strength and toughness: Unlike many ceramics, which are typically brittle, silicon nitride has excellent fracture toughness, making it more resistant to cracking under pressure.
Silicon nitride is generally an insulating material and is not inherently conductive.
In its pure form, silicon nitride is an electrical insulator, meaning it does not conduct electricity very well. This property makes it useful in a variety of applications where electrical insulation is required, such as insulating layers in the semiconductor industry or in high-temperature environments.
However, silicon nitride can be doped or modified to exhibit conductive or conducting properties under specific conditions. By introducing certain impurities or changing its composition, silicon nitride can be engineered to be a semiconductor or even a conductor.
Why choose Zhen An Metallurgy as your long-term partner?
30 years of production and sales experience:
Zhenan Metallurgy is located in Anyang City, Henan Province, China. It has 30 years of production experience and can produce high-quality fe si according to user requirements.
Customized according to customer needs:
Zhenan Metallurgy has its own metallurgical experts, and the chemical composition, particle size and packaging of ferrosilicon can be customized according to customer requirements.
Worry-free delivery:
The annual output of Zhen’an metallurgical fe Si is 1.5 million tons, and the spot inventory is 200,000 tons. The supply is stable and the delivery is timely.
Free samples:
Zhenan Metallurgical will give you the greatest support, and provide free ferrosilicio samples.
Support third-party testing:
Zhenan Metallurgical has a strict quality control system. ferro silicio has been inspected more than 3 times before leaving the factory. At the same time, we accept third-party inspections such as SGS and BV to provide you with the greatest guarantee.
Manufacturer’s strength display:
Our factory covers an area of 30,000 square meters, with a full set of modern production equipment, two large-scale production bases such as hydrometallurgy, two key laboratories and a metallurgical material testing center with 16 senior researchers.
30000(m2)
Our factory covering an area of 30,000 square meters
1500000
Annual production and sales more than 1,500,000 tons.
Professional team to provide you with better service
Zhenan Metallurgy has a high-quality talent team integrating sales, production and R&D, including 16 senior researchers, 28 professional engineers, 35 international sales personnel, 10 senior operation personnel, and more than 300 production technicians.
Zhen An metallurgical certificate display
Zhen An metallurgical certificate display
Our products have been exported to 78 countries, and many regular customers have visited our company and factory and placed multiple orders. For one cooperation, customers will return orders many times, and some customers will introduce new customers to us.
