refractory Silicon Nitride Ceramic Sleeve bush
Reputation depends on quality, quality comes from Hard!
Silicon Nitride Ceramic:
The normal-pressure sintered silicon nitride is prepared by mixing a high-purity, ultra-fine, high-α content silicon nitride powder with a small amount of a sintering aid, and forming it by a process such as forming and sintering. During the sintering process, the α phase dissolves into the liquid phase, and then precipitates on the β-Si3N4 nucleus to become β-Si3N4, which is advantageous for the sintering process. Nitrogen must be introduced during sintering to suppress the pyrolysis of Si3N4. At normal pressure sintering, a ceramic having a complicated shape and excellent performance can be obtained, and the disadvantage is that the sintering shrinkage rate is large, generally 16% to 26%, which easily causes cracking and deformation of the product. The reaction-sintered Si3N4 sintered compact is placed in a silicon nitride powder in the presence of a sintering aid, and is re-sintered at a high temperature to obtain a dense Si3N4 product. The sintering aid can be introduced during the ball milling of the silicon powder, or can be impregnated by the impregnation method after the reaction sintering. Since the process can be pre-processed during the reaction sintering process, the shrinkage during the re-sintering process is only 6% to 10%, so that a component having a complicated shape and excellent performance can be prepared.
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↓
Color: Black Grey
Density: ＞3.2g/cm3
Hardness: HRA90
Vickers Hardness (Hv50): ＞1550 HV0.5
Modulus of Elasticity: 290Gpa
Flexural Strength: ＞600Mpa
Compressive Strength: 2500Mpa
Modulus of Elasticity(25°C): 65Gpa
Fracture toughness:＞6.0 Mpam1/2
Maximum Use Temperature: 1200°C
Thermal Conductivity:15-20 W(m.K)
Thermal Expansion Coefficient: ＞3.1 10-6/°C
Thermal Shock Resistance: 500 △T°C
Special Heat Capacity: 700 KJ/kg.K
Dielectric Strength: 1 KV/mm
Dielectric Constant: er
Volume Resistivity(20°C): 1.0*10(12)Ω.cm
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.
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
Products Show
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.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
