Silicon Nitride
Your Professional Silicon Nitride Supplier
Our goal is to become your true partner in the field of silicon nitride in China. ZHEN AN INTERNATIONAL CO., LIMITED is an enterprise specializing in Metallurgical products, integrating production, processing, sales, and importing and exporting business with 30+ years of experience. We are committed to providing a "one-stop service" to meet our customers ' needs. We have a skilled engineering team dedicated to refining every stage, from product development and process improvement to production oversight, ensuring every product delivered meets rigorous quality and performance standards.The price is competitive and the product is quality-assured, which is a good choice for your long-term cooperation.
Why Choose Us
Our equipment
Our company has advanced production equipment, including 8 12500KW submerged arc furnaces and multiple crushing equipment production lines.
Our customization
Our engineers can provide customized solutions according to the needs of different customers, and specific parameters, sizes and packaging can be customized.
Product market
We not only meet the needs of Chinese steel companies, but also export our products to 150 countries and regions including Japan, South Korea, India, Europe, and the United States.
Our services
In the pre-sales stage, our team of experts will recommend the most suitable products according to the needs of customers and provide detailed technical consultation. During the sales period, we ensure timely delivery and provide installation guidance. For after-sales, we provide long-term technical support, warranty services and spare parts to help customers maximize the use of products and get reliable maintenance during use.
Advantages of Silicon Nitride
Compared with other technical ceramics, the low thermal expansion coefficient of silicon nitride provides good thermal shock resistance. It is very hard, better than most metals in terms of high temperature capacity, and has excellent oxidation resistance. As a result, silicon nitride can withstand the harshest conditions in the most demanding high temperature and high load applications.
|
Item |
Purity |
ACCESS POINTS |
SSA |
Color |
Crystalline stratum |
Morphology |
Density of bulk materials |
|
S3N4 |
>99.9% |
20nm |
93m2/g. |
White |
Amorphous |
Spherical |
0.09 g/cm3 |
|
S3N4 |
>99.9% |
800 nm |
65m2/g. |
Grey White |
Alpha |
Cubic with a center on the face |
0.23 g/cm3 |
|
S3N4 |
>99.9% |
800 nm |
49m2/g. |
Light Green Grey |
Alpha |
Cubic with a center on the face |
0.69 g/cm3 |
Types of Silicon Nitride
Reaction bonded silicon nitride (RBSN): The treatment of RBSN first forms a silicon "dough" or lump, and then undergoes a surface hardening process called nitriding at a temperature of about 1450°C. Compared with other types of silicon nitride, RBSN is more porous (porosity is about 25%) and is not as good as other types of silicon nitride in mechanical properties.
Hot-pressed silicon nitride (HPSN): It is made of a mixture of fine Si3N4 powder and magnesia flux in a graphite mold and is subjected to high temperature and high pressure (usually 1800 °C and 40MPa). Compared with RBSN, it has higher density and better mechanical properties.
Sintered reaction bonded silicon nitride (SRBSN): SRBSN is an updated version of RBSN. In order to reduce the porosity of the final product, sintering additives are added to the initial powder mixture and then enable it to be sintered after the reaction bonding stage (at temperatures higher than 1800 °C and atmospheric pressure).
Sintered silicon nitride (SSN): In order to produce SSN, silicon nitride was pressureless sintered at about 1750 °C, combined with sintering additives such as magnesia, yttrium oxide and alumina to promote the densification process. The density is 98%, and the intensity range is 600-700 MPa.
Silicon nitride is stable in the presence of nitric, sulfuric and hydrochloric acids, and reacts less well with orthophosphoric acid. However, it reacts much more strongly with hydrofluoric acid. Silicon nitride is decomposed by alkali melts, oxides and carbonates of alkali metals. It does not react with chlorine up to 900°C, hydrogen sulfide up to 1000°C and hydrogen up to 1200°C. It does not react with Al, Pb, Sn, Zn, Bi, Cd, Cu melts; however, it forms silicides with transition metals and silicates with metal oxides at temperatures above 1200 °C. Oxidation of silicon nitride in air begins at temperatures above 900 °C.
Application in ironmaking refractories: It has good corrosion resistance, abrasion resistance and erosion resistance, and the service life of the torpedo lining refractory material is greatly improved.
Application in steelmaking refractories: In recent years, it has been used in the skateboard material at the bottom of the ladle at home and abroad. Adding its material to the skateboard improves the wear resistance, erosion resistance and service life of the skateboard, and reduces the cost of steel per ton of ladle refining.
Application in refractory smelting of non-ferrous metals such as aluminum, copper and zinc: It does not wet with metal solutions at high temperatures, so it can be used for high-temperature parts in the non-ferrous metal smelting process, such as temperature measuring thermowells, smelting furnace linings and various container linings, crucibles, etc.
Application in kiln furniture materials: The ceramic slab is a bonded silicon carbide material prepared by using silicon carbide as the particle raw material and metal Si as fine powder by reaction sintering in a high temperature nitrogen atmosphere, which greatly improves the performance of the material.
Silicon nitride is difficult to produce as a bulk material—it cannot be heated over 1850 °C, which is well below its melting point, due to dissociation to silicon and nitrogen. Therefore, application of conventional hot press sintering techniques is problematic. Bonding of silicon nitride powders can be achieved at lower temperatures through adding materials called sintering aids or "binders", which commonly induce a degree of liquid phase sintering. A cleaner alternative is to use spark plasma sintering, where heating is conducted very rapidly (seconds) by passing pulses of electric current through the compacted powder. Dense silicon nitride compacts have been obtained by this techniques at temperatures 1500–1700 °C.
|
Packing |
Bag /Steel Drum |
|
Shipping |
Shipped by road, sea, rail |
FAQ