thermal shock resistant Si3N4 ceramic motor accessories
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Silicon Nitride Ceramic:
By controlling the amount of porogen added and adjusting the particle size of the porogen, the porosity and pore size of the Si3N4 ceramic can be controlled. By adjusting the porogen content, a porous having a high porosity and a low dielectric constant can be prepared. Si3N4 ceramics, the lowest dielectric constant value is 2.4297. As the amount of porogen added increases, the porosity of the sample increases, the α-Si3N4 phase in the sample increases, the free silicon content decreases, and the sample ε' and tan δ The larger the pore size of the pore former, the larger the pore size of the porous Si3N4 sintered body after the reaction sintering, and the ε′ and tan δ of the sample have different amplitudes.
Since Si 3 N 4 is a compound mainly composed of a covalent bond, the bond force is strong and directional, and the formation and migration of structural defects require high energy, and even at high temperatures, the diffusion coefficient is low, which is It is very difficult to make pure Si 3 N 4 dependent on temperature only for densification. For this reason, it is necessary to add some additives to improve the sintering properties. For additives, we should consider the following problems: (1) Additives at high temperature should be The SiO 2 reaction on the surface of the Si 3 N 4 powder forms a liquid phase (attached: Si 3 N 4 "clean" surface is always covered with a layer of SiO 2 , which will seriously affect the sintering) (2) the viscosity of the liquid phase formed, surface The tension should be appropriate.
Silicon nitride composite: high temperature resistant, low dielectric, creep resistant radome silicon nitride film for anti-oxidation high performance missiles: excellent optoelectronic properties, high chemical stability, resistance to impurity diffusion and moisture infiltration High-strength silicon nitride ceramic ball: high hardness, high wear resistance, corrosion resistance, high temperature resistance, light weight, high processing precision, self-lubricating, and insulating properties are the preferred materials for ceramic bearings and hybrid ceramic ball bearings.
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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A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
