Polished Round Head Silicon Nitride Si3n4 Ceramic Bearing Roller

Product Description

Product Description

polished round head silicon nitride Si3N4 ceramic bearing roller

Reputation depends on quality, quality comes from Hard!

Silicon Nitride Ceramic:

Silicon nitride ceramic is an inorganic material ceramic that does not shrink when sintered. Silicon nitride is very strong, especially hot pressed silicon nitride, which is one of the hardest substances in the world. It has high strength, low density and high temperature resistance.
Si3N4 ceramic is a covalent bond compound. The basic structural unit is a [SiN4] tetrahedron. The silicon atom is located at the center of the tetrahedron. There are four nitrogen atoms around it, which are located at the four vertices of the tetrahedron, and then every three A tetrahedron shares the form of an atom, forming a continuous and robust network structure in three dimensions.

 

Si3N4 ceramic is an important structural material. It is a kind of super-hard material. It is lubricious and wear-resistant. It does not react with other inorganic acids except hydrofluoric acid. It has strong corrosion resistance and resistance at high temperature. Oxidation. Moreover, it can withstand cold and hot shock. It is heated to above 1,000 °C in air, and is rapidly cooled and heated rapidly without cracking. It is because of the excellent characteristics of Si3N4 ceramics that people often use it to manufacture bearings. Mechanical components such as gas turbine blades, mechanical seal rings, permanent molds, etc. If the silicon nitride ceramics with high temperature resistance and heat transfer resistance are not used to manufacture the heating surface of the engine components, the quality of the diesel engine can be improved, the fuel can be saved, and the thermal efficiency can be improved. China, the United States, Japan and other countries have developed such diesel engines.
 

Silicon Nitride Properties:

High hardness, high strength, wear resistance, corrosion resistance, high temperature(1200°), good thermal diffusivity, good thermal shock resistance(avoid the temperature changing rapidly), good insulativity, low density. The comprehensive properties are best in most of structure ceramic.

Data Sheet↓

Properties of Silicon Nitride (Si3N4) Ceramics
Item	Unit	Typical Values
Physical Properties
Density	g/cm3	>3.2
Mechanical Properties
Rockwell Hardness		HRA90
Vickers Hardness (Hv50)	HV0.5	>1550
Modulus of Elasticity	Gpa	290
Flexural Strength	Mpa	>600
Compressive Strength	Mpa	2500
Fracture toughness	Mpam1/2	>6.0
Thermal Properties
Maximum use temperature	°C	1200
Thermal Conductivity	W/(m.k)	15-20
Thermal Expansion Coefficient	10-6/°C	>3.1
Thermal Shock Resistance	T°C	500
Specific Heat Capacity	KJ/kg.K	700
Electrical Properties
Dielectric Strength	KV/mm	1
Dielectric Constant	Er
Volume Resistivity at 20°C	Ω.cm	1.0X1012

Application industry: Machinery, electronic, semiconductor, chemical, petroleum, smelt.
Specific application: Welding shaft, electronic substrate, plunger, nozzle, slide guide, diesel parts, metal molding, shaft wheels etc.


Company Information

Shenzhen Hard Precision Ceramic CO.,Ltd founded in 2007, located in Shenzhen of China. We are a company that integrates development, design, moulding, sintering, production and sales of precision ceramic products. After 10 years of development, we have cooperated with more than 2000 customers and 60 universities; our factory covers an area of 2000 square meters, 50 employees, and annual production value of nearly 20 million. We have a higher visibility and better reputation in the same industry.

 

Compared with metals material, ceramic materials have excellent properties such as high hardness, high strength, high temperature(fire) resistance, wear resistance, corrosion resistance, acid and alkali resistance, oxidation resistance, insulation, nonmagnetic, good chemical stability and other excellent performance, so it is often used in the environment of the metal material is not up to. Advanced ceramics application prospect are very widely. It's widely used in aerospace, aviation, military industry, nuclear power, machinery, textile, chemical, electronic, food, medical, etc. We provide alumina ceramic, zirconia ceramic, silicon nitride (Si3N4) ceramic, macor (mica glass ) ceramic, aluminum nitride (AIN) ceramic, silicon carbide (SiC) ceramic, boron nitride (BN) ceramic, quartz ceramic, mullite ceramic, cordierite ceramic etc.

 

Our products include ceramic rods, ceramic tubes, ceramic plates, ceramic sheets, ceramic blocks, ceramic nozzles, ceramic plungers, ceramic washers, ceramic spacers, ceramic substrates and precision parts for industrial. We have all-line high precision equipment from ceramic forming, sintering to precision machining. Hope for a wide range of sincere cooperation with customers at domestic and abroad.

Why Choose Us?

1.12 years of professional production industrial ceramics factory
2.High quality products with low price
3.High precision parts with lowest tolerance
4.Short time for production 
5.Has a group of experienced, professional and efficient R&D team
6.Has a good reputation in China and abroad.
7.MOQ is not limited, small quantity is welcome.
8.Vigorous team and good after-sales service
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FAQ

Q: Are you trading company or manufacturer ?
A: We are factory.

Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock. or it is 15-30 days if the goods are not in stock, it is according to quantity.

Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.

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A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.

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