corrosion resistant Si3N4 ceramic micro locating step pin
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Silicon Nitride Ceramic:
The silicon nitride powder and the sintering aid are placed in a graphite mold and unidirectionally pressed and sintered at a high temperature. Since the applied pressure increases the driving force of sintering, the α→β transition and the densification speed are accelerated. The hot pressing method can obtain a high-strength silicon nitride ceramic having a density of more than 95%, which has high material properties and a short manufacturing cycle. However, this method can only produce a product having a simple shape, and the processing cost is high for a component having a complicated shape, and the structure has a preferred orientation due to one-way pressurization, so that the performance is different in parallel and perpendicular to the hot pressing surface. In the gas pressure sintering, the Si3N4 compact is sintered at 1800 to 2100 °C in nitrogen gas of 5 to 12 MPa. Due to the high nitrogen pressure, the decomposition temperature of Si3N4 is increased, which is beneficial to the use of a sintering agent capable of forming a high-refractory intergranular phase to improve the high-temperature properties of the material. The mixture of silicon nitride and sintering aid is powdered into a metal or glass envelope, vacuumed and sintered at a high temperature by a high pressure gas. The commonly used pressure is 200 MPa, and the temperature is 2000 ° C. The hot isostatic pressure silicon nitride can reach the theoretical density, but the process is complicated and the cost is high.
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
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