The scope of application and production methods of silicon nitride

Silicon nitride is an inorganic substance with the chemical formula Si3N4. It is an important structural ceramic material with high hardness, inherent lubricity, and wear resistance. It is an atomic crystal; it is resistant to oxidation at high temperatures. Moreover, it can resist the impact of cold and heat. It will not break when heated to over 1000°C in the air, cooled rapidly and then heated rapidly. It is precisely because of the excellent characteristics of silicon nitride ceramics that people often use it to manufacture bearings, turbine blades, mechanical seal rings, permanent molds and other mechanical components. If silicon nitride ceramics, which are resistant to high temperatures and difficult to transfer heat, are used to make the heating surfaces of engine parts, not only can the quality of the diesel engine be improved, fuel savings, and thermal efficiency can be improved. China, the United States, Japan and other countries have developed such diesel engines.

Characteristics of Silicon Nitride

Except for hydrofluoric acid and hot phosphoric acid, it does not react with other inorganic acids and has strong corrosion resistance.

How to produce silicon nitride

There are two production methods for silicon nitride ceramic products, namely, reaction sintering and hot pressing sintering. The reaction sintering method is to shape silicon powder or a mixture of silicon powder and silicon nitride powder according to the general production method of ceramic products. Then in the nitriding furnace, it is pre-nitrided at 1150~1200℃, after obtaining a certain strength, it can be machined on the machine tool, and then further nitriding at 1350~1450℃ for 18~36h, until all becomes silicon nitride . The product thus obtained has accurate dimensions and stable volume. The hot pressing sintering method is to press silicon nitride powder and a small amount of additives (such as MgO, Al2O3, MgF2, AlF3 or Fe2O3, etc.) at a pressure above 19.6MPa and sintering under the conditions of 1600~1700℃. Generally, products made by hot pressing sintering have higher density and better performance than products made by reaction sintering. Attached Table 1 lists the properties of silicon nitride ceramics produced by these two methods.

Overview of silicon nitride Si3N4 powder

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

Application of silicon nitride Si3N4 powder

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

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

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

4) Colorless, transparent, self-lubricating and wear-resistant nano-particle film, used for high-level surface protection such as mobile phones and automobiles.

5) Ball bearings.

6) Ball valves and parts.

7) Corrosion resistant turbine.

Silicon nitride Si3N4 powder price

The price of silicon nitride Si3N4 powder will vary randomly with changes in production costs, transportation costs, international conditions, exchange rates and the supply and demand of silicon nitride Si3N4 powder. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for silicon nitride Si3N4 powder, please feel free to send an inquiry to get the latest price of silicon nitride Si3N4 powder.

Silicon Nitride Si3N4 Powder Supplier

As a global silicon nitride Si3N4 powder supplier, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (titanium nitride, silicon nitride, titanium nitride, etc.) high-purity targets, functional ceramics and structural devices, and provides OEM services.