Silicon Nitride ceramic yarn wheel guide roller caster
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Silicon Nitride Ceramic:
Since silicon nitride is a covalent compound with high bond strength and can form an oxide protective film in air, it also has good chemical stability. It is not oxidized below 1200 °C, and a protective film is formed at 1200 to 1600 °C to prevent further. Oxidation
Methods for measuring Young's modulus generally include stretching method, beam bending method, vibration method, internal consumption method, etc., and experiments using fiber displacement sensors, moiré fringes, eddy current sensors, and wave transfer technology (microwave or ultrasonic) have also appeared. Techniques and methods for measuring Young's modulus
There are two crystal forms of Si3N4, namely α-Si3N4 (granular crystal) and β-Si3N4 (long column or needle crystal), all of which belong to hexagonal crystal system, which are three-dimensional space composed of [SiN4] tetrahedron sharing apex angle. The network and phase are formed by overlapping six hexagonal ring layers composed of almost completely symmetrical [SiN4] in the c-axis direction and the α phase is composed of two different and deformed non-hexagonal ring layers overlapping to form α-phase structural symmetry. Low, the internal strain is larger than the β phase, so the free energy is higher than the β phase, and the α phase can be converted to the β phase at a higher temperature (1400°C to 1600°C). Therefore, some people refer to α-Si3N4 as a low temperature type, which is unstable. β-Si3N4 is a high temperature type, which is a stable high temperature insoluble compound, has no melting point, and has high resistance to high temperature creep. The binder-free reaction sintered silicon nitride has a softening point of 1800 ° C or higher, FLToma et al. [39] Laser etching technology is used instead of the traditional sand blasting process to treat Si3N4 ceramics, which can better combine the coating with the Si3N4 ceramic matrix and reduce the friction coefficient of the frictional contact surface. There are a total of Si, N, H, F four elements, relatively easy to determine, silicon nitride + hydrofluoric acid = PTFE Silicon + ammonia (silicon is easy to combine with F to produce silicon tetrafluoride. This is common sense, remember (and the reason why hydrofluoric acid is not stored in glass containers (silica)), the price of silicon and fluorine in the reaction The state can be determined to be constant, and if H and N are redox generating hydrogen and nitrogen, the possibility is small, so there is no valence change in the reaction)
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.
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