Name: Silicon Nitride Raw Material On Sale - China Supplier
Brand: 镇安冶金
Price: 1 USD
Availability: InStock

镇安冶金

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.

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包装：1吨吨袋

100-200mm Customizable

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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, ，和 oxidation resistance.

The material is currently used in market segments such as reciprocating engine components and turbochargers, bearings, metal cutting 和 forming tools, and hot metal processing.

Shapes of Slicon Nitride

Silicon Nitride Ball

Silicon nitride balls and silicon nitride have the same composition and the same function.

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silicon Nitride Powder

氮化硅粉 with very small particle sizes, usually at the nanoscale (nanoscale) or submicron scale

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Silicon Nitride Lump

Silicon nitride blocks have uniform structure and density, and the size can be customized.

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Silicon Nitride Specifications

产品	Phase Ratio	Purity (%)	Particle D50 (μm)	Element content (%)				Impurity (ppm)
产品	Phase Ratio	Purity (%)	Particle D50 (μm)	N	O	C	Si free	铁	阿尔	钙
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

包装：
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.

备注：可根据要求提供其他化学成分和尺寸。.

供应能力： 每月30万吨

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	N₄硅₃
Molecular Weight	140.28
外貌	odorless grey powder
熔点	1900 °C, 2173 K, 3452 °F
沸点	N/A
密度	2.2 to 3.5 g/cm³
Solubility in H2O	Insoluble
Refractive Index	2.016
电阻率	11 to 12 10x Ω-m
泊松比	0.24 to 0.27
Specific Heat	720 to 800 J/kg-K
热导率	12 to 31 W/m-K
Thermal Expansion	2.5 to 3.2 µm/m-K
杨氏模量	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.

Choosing the Optimal silicon Nitride for Your Business

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 碳化硅 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.

Choosing the Best silicon nitride for Your business

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.

Choosing the Optimal silicon Nitride for Your Business

航天：

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.

Choosing the Optimal silicon Nitride for Your Business

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.
粒径： 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.