Rolling Element Precision Bearing Ball Silicon Nitride Ceramic
balls G10 for Bearing
►The development history of CAEC silicon nitride ceramic balls:
1986-1990 Exploratory research on ceramic bearings
1991-1995 Preliminary Research on Ceramic Ball Bearings and Ceramic
Balls for Bearings
1996-2000 Mass manufacturing technology development of high-speed
precision ceramic ball bearings
2000-now Comprehensively improve the level of silicon nitride
manufacturing
►Production process of CAEC silicon nitride ceramic balls:
Raw material-granulation-pressing-cold isostatic pressure
vessel-air pressure sintering vessel-grinding process-testing and
inspection-finished product.
►Quality Assurance System of CAEC silicon nitride ceramic balls:
Use laser confocal microscope and ultrasonic scanning microscope
for particle size analysis, impurity content analysis, oxygen and
nitrogen content analysis, phase composition analysis.
►Performance testing of CAEC silicon nitride ceramic balls:
Density, hardness, vibration value, crushing load, fracture
toughness.
►Product features of CAEC silicon nitride ceramic balls:
I. Excellent friction performance
1. Since the affinity of steel/ceramic matching is lower than that
of steel/steel, when the lubricating film is not formed well or
lacks lubrication, the lower affinity can effectively reduce the
risk of adhesive friction.
2. Due to the high hardness of the ceramic ball, in the case of
severe friction, the ceramic ball has good dimensional and shape
accuracy retention and repairability to the groove to ensure the
bearing running.
II. Small spin-to-roll ratio
Compared with steel bearings, the spin-to-roll ratio of ceramic
ball bearings is about 30% lower, indicating that ceramic ball
bearings have better contact conditions and lower spin friction.
III. Low temperature rise
Less heat; Small deformation; Low coefficient of friction; Small
centrifugal force and gyro torque.
►Technical parameters of CAEC silicon nitride ceramic balls:
| Item | Materials class |
| I | II | III |
| Property | Bending strength σ3.40 (Mpa) | 900 | 800 | 600 |
| Crushing load ratio (%) | 35 | 35 | 30 |
| Hardness (HV10) | 1580 | 1480 | 1380 |
| Fracture toughness (Mpa.m1/2) | 6.0 | 5.0 | 5.0 |
| Maximum limit of microstructure | Pore size (μm) | 10 | 10 | 25 |
| Porosity (%) | 0.02 | 0.06 | 0.06 |
| Crystal phase (μm) | 10 | 10 | 25 |
| The second ceramic phase (μm) | 25 | 25 | 25 |
Maximum amount of inclusions
per square centimeter of cross section | Range 200 (μm) | 0 | 0 | 1 |
| Range 100~200 (μm) | 0 | 1 | 2 |
| Range 50~100 (μm) | 1 | 2 | 4 |
| Range 20~50 (μm) | 4 | 8 | 16 |
| Application of Si3N4 ceramic ball |
| G3 | G5 | G10, G16 | G20, G28, G40 |
| Class I | High speed power equipment |
Main drive bearing |
| |
| Class II |
| Vacuum equipment,
high speed instrument,
mechanical devices,
| Motor | Testing ball, separating ball |
| Class III | | | Sport, entertainment,
food processing | Mechanical devices |
| Si3N4 ceramic ball specifications |
| Nominal diameter of ceramic ball | Nominal diameter of ceramic ball | Nominal diameter of ceramic ball |
| mm | in | mm | in | mm | in |
| 0.794 | 1/32 | 0.8 | | 1 | |
| 1.588 | 1/16 | 2 | | 2.381 | 3/32 |
| 2.5 | | 3 | | 3.969 | 5/32 |
| 4 | | 4.5 | | 4.762 | 3/16 |
| 5 | | 5.5 | | 5.556 | 7/32 |
| 5.953 | 15/64 | 6 | | 6.35 | 1/4 |
| 6.5 | | 6.747 | 17/64 | 7 | |
| 7.144 | 9/32 | 7.5 | | 7.938 | 5/16 |
| 8.731 | 11/32 | 9.525 | 3/8 | 11.112 | 7/16 |
| 12.303 | 31/64 | 12.7 | 1/2 | 13.494 | 17/32 |
| 14.288 | 9/16 | 15.081 | 19/32 | 15.875 | 5/8 |
| 19.05 | 3/4 | 25.4 | 1 | 31.75 | 1 1/4 |
►ZYS Manufacturing capacity of Si3N4 ceramic ball:
►Exhibition of Si3N4 ceramic ball:
