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Alumina Ceramics:
Material properties of Silicon Nitride ceramic riser
It is a high-temperature insoluble compound, has no melting point, strong resistance to high-temperature creep, the load softening point of reaction sintered silicon nitride without binder is above 1800 ℃, the friction coefficient of silicon nitride ceramic is small, under high temperature and high speed conditions , The increase of friction coefficient is also small, so it can ensure the normal operation of the mechanism, which is one of its outstanding advantages. The sliding friction coefficient of silicon nitride ceramic when it starts to grind reaches 1.0 to 1.5. After precision running-in, the friction coefficient is greatly increased. It drops and stays below 0.5, so Silicon Nitride Ceramics are considered to be self-lubricating materials. The ceramics sintered at high temperature are composed of many crystallites aggregated polycrystals, which inevitably exist on the grain boundaries. The atoms cannot be arranged in an orderly manner, they have a transitional nature, and the structure is relatively loose. Therefore, the grain boundary is an important channel for the rapid diffusion of atoms (ions). It is a weak part of the ceramic in the acid-base environment. The corrosion of silicon nitride ceramics in acid solution The characteristics are closely related to the number and crystallinity of grain boundary phases. Schilm [13] et al. Took six kinds of silicon nitride samples as experimental materials and used 1N sulfuric acid solution as the etching solution for corrosion. Several factors affecting the corrosion of silicon nitride ceramics were obtained (1) The effect of SiO2 content With the increase of SiO2 content in silicon nitride ceramics (22 ～ 42%), the reaction rate constant gradually decreases, and the initial corrosion rate even decreases by more than two orders of magnitude.
properties: High hardness, high strength, wear resistance, corrosion resistance, high temperacture (1600°), good thermal diffusivity, good insulativity, low cost etc.
Data Sheet↓
Color: White/Ivory Density: 3.9g/cm3 Alumina Content: 96% 99% 99.5% Gas permeability: 0 Water Absorption: 0 MONS' Hardness: 82 Vickers Hardness (Hv50): 15.7(1600) Gpa(Kg/mm²) Flexural Strength(20°C): 330Mpa Compressive Strength(20°C): 2000Mpa Fracture Toughness (20°C): 4 MPam1/2 Thermal Conductivity(20°C): 27.5W(m.K) Thermal Expansion Coefficient: 7.6 10-6/°C Thermal Shock Resistance: 200 △T°C
Maximum use temperature 1650°C
Dielectric Strength: ＞10 KV/mm
Dielectric Constant: 9.1er
Dielectric Loss Angle(1MHz): 0.0002-0.0003
Volume Resistivity(20°C): ＞1014Ω.cm
Application industry: Machinery, electronic, chemical, petroleum etc. Specific application: Electrical ceramic substrate, plunger, sealing ring etc.
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