high temperature insulated Silicon Nitride ceramic washer gasket spacer
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Silicon Nitride Ceramic:
Excellent high temperature characteristics. The melting point ranges from 1800°C to 2500°C, with high resistance to high temperature oxidation, and the use temperature reaches 1400°C. Its flexural strength hardly decreases at a high temperature of 800°C, and its hardness decreases with increasing temperature in a smaller proportion than Other Materials.
Ⅱ. It has high toughness. At room temperature, its fracture toughness value KIC reaches 30 MN/m work, which is equivalent to 6-8 times that of representative engineering Ceramic Silicon Carbide. When the grain size of B4C is refined to 5μm, the strength is 500-600 MPa, and when the grain size is less than 1μm, the strength is more than 1000 MPa. Ⅲ. High hardness and good wear resistance. The hardness is about 1000 HV, and it has a high shear modulus. Chemical resistance, hard to volatilize, but poor high temperature corrosion resistance and oxidation resistance. [10]
b. Types of boride ceramics Commonly used boride ceramics are made of zirconium diboride (ZrB2), titanium diboride (TiB2), lanthanum hexaboride (LaB6) and other borides. Titanium ceramics, chromium boride ceramics, molybdenum boride ceramics and tungsten boride ceramics. Boride ceramics have the characteristics of high melting point, high hardness, high chemical stability, high wear resistance and corrosion resistance, and are one of the important refractory materials. It is widely used in nuclear industry, aerospace and other fields. Mainly used for high temperature bearings, internal combustion engine nozzles, various high temperature devices, devices for processing molten non-ferrous metals, electrical contact materials, wear resistant materials and tool materials. In mold manufacturing, it is often used to manufacture mold structural elements, heat-resistant components, etc. ④Nitride ceramics Nitride ceramics are ceramics whose main components are refractory compounds in which nitrogen and metal or nonmetal elements are covalently bonded. Ⅰ. The properties of nitride ceramics a. Silicon Nitride Ceramics have the best oxidation resistance. It starts to oxidize at 1400°C and has good chemical resistance. Some also have special mechanical, dielectric or thermal properties. [10]
b. Sintering is more difficult. Firstly produce high-quality powder raw materials, and then use nitriding reaction sintering method, hot pressing method sintering method, hot isostatic pressing sintering method, etc. to make ceramic products. Ⅱ. Types of nitride ceramics
The widely used ceramics include silicon nitride (Si3N4), boron nitride (BN), aluminum nitride (AlN) and other ceramics.
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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