YDTech™ supplier of Si3N4 ceramics for beads,valve balls, rollers, bearings! OEM of ceramic silicon nitride balls,rings,tube,block, or custom in china.
we manufacture silicon nitride balls and rollers,zirconia balls.we have 20 years silicon nitride balls manufacturing history,silicon nitride (si3n4) ceramics had excellent performance.we also provide si3n4 balls for high precision bearing. size : 0.8 to 101.6 mm precision: g5,g10,g20,g100
silicon nitride ceramic balls deliver unsurpassed performance in critical components such as hybrid bearings.
Specified for use in such high-technology industries as aerospace and defense, high spec ceramic balls feature these advanced characteristics:
aplication of silicon nitride balls: high precision bearing balls for high speed,vacuum,fixed anode x-ray tube,high temp,low temp,electric insulation,high precision ballscrew set,valve balls for acid,alkali,salt,measure pumps,flowmeter.
ceramic ball bearings are created from hot presses with a combination of nitrogen, silicon powder and silicon nitride ceramic which after many industrial testing has shown to have much bigger degree of hardness compared to other familiar types. they are made of up of 3 major components an outer race, an inner race, and the balls. we will manufacture your silicon nitride balls.
silicon nitride (si3n4) ceramic balls are formed from a new material suitable for applications where high loads, high speeds and extreme temperatures are factors. long life and the need for minimal lubrication make this material appropriate for extreme applications. silicon nitride is non-porous, non magnetic, non corrosive, lighter than steel and, in ball form, is harder than steel. because ceramic balls are non-porous they are virtually frictionless and are capable of spinning faster than steel balls.
the most common use for silicon nitride balls is in bearings. silicon nitride bearing balls have a coefficient of thermal expansion just 25% if most steel balls, so there is less friction generated in the bearing as heat increases. the low thermal conductivity of silicon nitride balls reduces the amount of heat absorbed, thus reducing cooling system requirements. some sizes are available from stock; others may be manufactured to your specifications
| metric | inch | metric | inch | metric | inch | ||||
| 1mm | " | 1.50mm | " | 1.588mm | 1/16" | ||||
| 2mm | " | 2.381mm | 3/32" | 3.175mm | 1/8" | ||||
| 3.5mm | " | 3.969mm | 5/32" | 4.763mm | 3/16" | ||||
| 5mm | " | 5.556mm | 7/32" | 5.953mm | 15/64" | ||||
| 6.35mm | 1/4" | 6.747mm | 17/64" | 7.114mm | 9/32" | ||||
| 7.938mm | 5/16" | 8.731mm | 11/32" | 9.525mm | 3/8" | ||||
| 10.318mm | 13/32" | 11.113mm | 7/16" | 11.509mm | 29/64" | ||||
| 11.906mm | 15/32" | 12.303mm | 31/64" | 12.7mm | 31/64" | ||||
| 13.494mm | 17/32" | 14.288mm | 9/16" | 15.081mm | 19/32" | ||||
| 15.875mm | 5/8" | 16.668mm | 21/32" | 17.463mm | 11/16" | ||||
| 18.256mm | 23/32" | 19.05mm | 3/4" | 19.844mm | 25/32" | ||||
| 20.638mm | 13/16" | 22.225mm | 7/8" | 23.812mm | 15/16" | ||||
| 25.4mm | 1" | 26.988mm | 17/16" | 28.575mm | 9/8" | ||||
| 30.163mm | 21/16" | 31.75mm | 5/4" | 33.338mm | 21/16" | ||||
| 34.925mm | 11/8" | 36.512mm | 23/16" | 38.1mm | 3/2" | ||||
| 41.275mm | 13/8" | 47.625mm | 15/8" | 50.8mm | 2" | ||||
| ceramic balls,silicon nitride balls,Si3N4 balls, rings,ceramic valve balls,ilicon nitride tube,,Si3N4 block, | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| density(g/cm3) | relative density(％) | elastic modulus(GPa) | compression strength ratio(25C)％ | Hardness HV(GPa) | |||||
| 3.260.02 | >99.5 | 300-320 | 40-50 | 16-20 | |||||
| Fracture toughness(MPa.m1/21/2) | Bending trength(MPa) | Poisson's ratio | Linear expansion coefficient10-6K-1 | Webuller modulus | |||||
| 6.0-9.0 | 600-1000 | 0.25 | 3.1-3.3 | 12-15 | |||||
| Thermal conductivity (W.(m.K)-1) | Specific resistance ratio | Corrosion resistance | Size stability | Magnetic | |||||
| 15-20 | 1018 | Excellent | Excellent | None | |||||
| ceramic balls,silicon nitride balls,Si3N4 balls, rings,ceramic valve balls,ilicon nitride tube,,Si3N4 block, | |||||||||
|---|---|---|---|---|---|---|---|---|---|
silicon nitride balls can be obtained by direct reaction between silicon and nitrogen at temperatures between 1300 and 1400, some of the advantages of silicon nitride balls are fine crystalline they never rust, and can roll without oil or grease. silicon nitride is a chemical compound of silicon and nitrogen. it is a hard ceramic having high strength over a broad temperature range, moderate thermal conductivity, low coefficient of thermal expansion, moderately high elastic modulus, and unusually high fracture toughness for a ceramic. this combination of properties leads to excellent thermal shock resistance, ability to withstand high structural loads to high temperature, and superior wear resistance. silicon nitride is mostly used in high-endurance and high-temperature applications, such as gas turbines, car engine parts, bearings and metal working and cutting tools.
silicon nitride bearings are used in the main engines of the nasa's space shuttles. thin silicon nitride films are a popular insulating layer in silicon-based electronics and silicon nitride cantilevers are the sensing parts of atomic force microscopes.