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Application of silicon nitride Si3N4

2022-10-09 09:39:30  News

Overview of silicon nitrideSi3N4 powder

Silicon nitride Si3N4 powder is an inorganic substance with a chemical formula of Si3N4.Si3N4 is an important structural ceramic material with high hardness,inherent lubricity,wear resistance, atomic crystals,and oxidation resistance at high temperatures.

Silicon nitride is an inorganic substance with the chemical formula Si3N4. It is an important structural ceramic material with high hardness, lubricity and wear resistance, and is an atomic crystal; it is resistant to oxidation at high temperatures. And it resists the effects of cold and cold, heats into the air to 1000°C or more, then cools sharply and then heats, it won't break. It is because of the excellent properties of silicon nitride ceramics that they are often used to manufacture mechanical components such as bearings, air turbine blades, mechanical seals, permanent molds, etc. If silicon nitride ceramics are resistant to high temperature and difficult to transfer, the heat absorption surface of engine components can be improved, which not only has good quality, but also saves fuel and improves thermal efficiency.

Application of silicon nitride Si3N4

Crystal structure of Silicon Nitride

Si3N4 has two kinds of crystal structure: α-Si3N4 is granular crystal and β-Si3N4 is needle crystal. Both of them are three-dimensional networks composed of common vertices of [SN4] tetrahedron and belong to hexagonal system. The difference between them lies in the order of [SiN4] tetrahedral layers. The β phase is formed by the overlap of hexagonal ring layers composed of six almost completely symmetrical [SN4] tetrahedrons in the c-axis direction, while the α phase is formed by two layers of tangible transformation and different non-hexagonal ring layers. α phase can dissolve oxygen in the range of crystal structure, and the internal strain of α phase is larger than that of β phase, so the free energy is higher than that of β phase. From the point of view of thermodynamics, the β phase is more stable at higher temperature. The α phase has low symmetry and is easy to form. At the temperature of about 1500 ℃, the α phase undergoes a reconstruction transformation and is transformed into β phase. This transformation is irreversible, and the existence of some process conditions and quality is more beneficial to the transformation from α phase to β phase. α-Si3N4 is formed when the temperature is lower than 1350 ℃, and β-Si3N4 can be directly prepared at a temperature higher than 1500 ℃.

 Silicon Nitride properties

The molecular formula of silicon nitride is Si3N4, of which Si accounts for 60.06% and dint N accounts for 39.94%. There is a strong covalent bond between Si and N (of which the ion bond accounts for only 30%), so the Si3N4 has high hardness (Morse hardness 9), high melting point and stable structure.

The Si-N in silicon nitride crystal is mainly covalent bond, and the bonding strength is high, so it has a large elastic modulus (4.7 × 105kg/cm2). The coefficient of thermal expansion is low, but the thermal conductivity is large, so this material is not easy to produce thermal stress, so it has good thermal shock resistance and good thermal shock resistance. It has toughness, high mechanical strength at high temperature and small deformation at high temperature. (the high temperature deformation of silicon nitride ceramic with 2.5g/cm3 density is 0.5% at 1200 × 1000h ℃ and 23 × 7kg/cm2 load). Not eroded by many metals, due to the formation of a silicon dioxide layer, good oxidation resistance and good electrical insulation.

Application of silicon nitrideSi3N4 powder

1)Manufacturing structural devices: metallurgy,machinery,aviation,aerospace,etc.

2)Surface treatment of metals and other materials:such as molds,cutting tools,turbine blades.

3)Composite materials:such as metal,ceramic and graphite composite materials,rubber,plastics.

4)Colorless and transparent self-lubricating wear-resistant nanoparticle film,used for advanced surface protection such as mobile phones and automobiles.

5)Ball bearings.

6)Ball valve and parts.

7)Corrosion resistant turbine.

Si3N4 price of silicon nitride

Due to factors such as production cost, transportation cost, international market conditions, exchange rate, supply and demand of silicon nitride Si3N4 powder market, the price of silicon nitride Si3N4 will fluctuate randomly. Tanji New Materials Co., Ltd. aims to help the industry and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full range of customized services. If you are looking for silicon nitride Si3N4 products, please feel free to send us information about silicon nitride Si3N4 products( ).

Silicon nitride Si3N4 supplier

As a global supplier of silicon nitride Si3N4, Tanji New Materials Co., Ltd. is committed to having rich experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (zinc stearate powder, tungsten carbide, silicon nitride, Si3N4, Er2O3, iron disilicide, ferroboron), high-purity targets, functional ceramics and structural devices, and provided OEM services.

If you are looking for high-quality silicon nitride Si3N4, please feel free to contact us and send an inquiry. ( ).

Specification of Silicon Nitride Si3N4 Powder:
Product Name:Silicon Nitride
Particle Size:0.5um-1um (α phase)

Chemical Composition of Silicon Nitride Si3N4 Powder:

Silicon Nitride Properties
Other Namessilicon (IV) nitride, a-Si3N4, SiN, trisilicon tetranitride, Si3N4 powder
CAS No.12033-89-5
Compound FormulaSi3N4
Molecular Weight140.28
AppearanceWhite to Gray Powder
Melting Point1900 °C
Boiling PointN/A
Density2.2-3.5 g/cm3
Solubility in H2OInsoluble
Electrical Resistivity11 to 12 10x Ω-m
Specific Heat720 to 800 J/kg-K
Poisson's Ratio0.24 to 0.27
Thermal Conductivity12 to 31 W/m-K
Thermal Expansion2.5 to 3.2  µm/m-K
Young's Modulus140 to 310 GPa
Exact Mass139.943 g/mol

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