insulating high hardness Si3N4 ceramic pintle bullet head
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Silicon Nitride Ceramic:
The molecular formula of silicon nitride is Si3N4, which belongs to the compound of covalent bond. The silicon nitride ceramic is polycrystalline material, and the crystal structure is hexagonal. It is generally divided into two crystal orientations, α and β, all of which are [SiN4]4-tetrahedron. The composition of the body, wherein β-Si3N4 has higher symmetry, smaller molar volume, thermodynamically stable phase in temperature, and α-Si3N4 is more kinetically generated. At high temperature (1400°C~1800°C), α phase A phase change occurs and becomes a β-type. This phase change is irreversible, so the α phase is favorable for sintering. Different crystal phases have different appearances of silicon nitride. α-Si3N4 is white or grayish white loose wool or needle-like body, and β-Si3N4 is darker in color, showing dense granular polyhedron or short prism, silicon nitride crystal. It must be transparent or translucent. The appearance of Silicon Nitride Ceramics is gray, blue-gray to gray-black. It varies depending on the density and the case, and it also has other colors due to additives. The surface of the silicon nitride ceramic is polished to have a metallic luster.
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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A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
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