hot pressured sintering Si4N4 Silicon Nitride Ceramic Tube bush
Reputation depends on quality, quality comes from Hard!
Silicon Nitride Ceramic:
Plasticizing pressure, also known as back pressure, refers to the pressure that the melt on the top of the screw of the injection machine receives when the screw retreats. It is controlled by adjusting the oil return resistance of the injection hydraulic cylinder. The plasticizing pressure increases the internal pressure of the melt and strengthens the shearing effect. Due to the shearing heat of the plastic, the temperature of the melt is increased. The increase of plasticizing pressure slows down the retreat speed of the screw, prolongs the heating time of the plastic in the screw, and the quality of plasticization can be improved; but excessive plasticizing pressure also increases the backflow and leakage of the melt in the cylinder metering chamber , Reduce the conveying capacity of the melt, reduce the amount of plasticization, increase power consumption, and too high plasticization pressure will cause shear heating or shear stress too large, and the melt is prone to degradation. Injection pressure refers to the melt pressure generated at the screw head during injection. When selecting the injection pressure, the allowable injection pressure of the injection molding machine should first be considered. Only when the injection pressure is too low, the cavity pressure is insufficient, and the melt cannot fill the cavity smoothly; on the contrary, if the injection pressure is too high, it will not only cause the product to overflow Leakage can also cause product deformation and even system overload.
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
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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.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
