technical Silicon Nitride ceramic machinery sleeve bush
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Silicon Nitride Ceramic:
Silicon Nitride Ceramic Standard Parts are standardized parts made of silicon nitride ceramic materials. The heat resistance of Silicon Nitride Ceramics means that stainless steel can maintain its excellent physical and mechanical properties at high temperatures.
Influence of carbon: Carbon is an element that strongly forms and stabilizes austenite and expands the austenite region in austenitic stainless steel. The ability of carbon to form austenite is about 30 times that of nickel. Carbon is an interstitial element and can significantly increase the strength of austenitic stainless steel through solid solution strengthening. Carbon can also improve the stress corrosion resistance of austenitic stainless steel in high concentration chloride (such as 42% MgCl2 boiling solution).
However, in silicon nitride, carbon is often regarded as a harmful element. This is mainly due to the fact that under certain conditions in the corrosion resistance of stainless steel (such as welding or heating at 450~850℃), carbon can interact with chromium in steel. The formation of high chromium Cr23C6 type carbon compounds leads to local chromium depletion, which reduces the corrosion resistance of steel, especially the intergranular corrosion resistance. therefore. Since the 1960s, most of the newly developed chromium-nickel austenitic stainless steels are ultra-low carbon type with a carbon content of less than 0.03% or 0.02%. It can be known that as the carbon content decreases, the intergranular corrosion sensitivity of steel decreases. When the carbon content is lower than 0.02% has the most obvious effect. Some experiments have also pointed out that carbon will increase the tendency of pitting corrosion of chromium austenitic stainless steel. Due to the harmful effects of carbon, not only should the carbon content be controlled as low as possible in the austenitic stainless steel smelting process, but also in the subsequent heating, cold working and heat treatment processes, the surface of the stainless steel is also prevented from increasing carbon, and chromium carbides should be avoided. Precipitation. When the number of chromium atoms in the steel is not less than 12.5%, the electrode potential of the steel can be changed abruptly, from a negative potential to a positive electrode potential. Prevent electrochemical corrosion. The corrosion resistance of stainless steel decreases with the increase of carbon content. Therefore, the carbon content of most stainless steels is low, the maximum does not exceed 1.2%, and the ωc (carbon content) of some steels is even lower than 0.03% (such as 00Cr12 ). The main alloying element in silicon nitride ceramics is Cr (chromium). Only when the Cr content reaches a certain value, the steel has corrosion resistance. Therefore, stainless steel generally has a Cr (chromium) content of at least 10.5%. Stainless steel also contains elements such as Ni, Ti, Mn, N, Nb, Mo, Si, and Cu.
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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