Zys Bearing Ceramic Balls with High Quality

Si3N4 is a new kind of bearing material with several good features, it possesses high temperature resistance, corrosion resistance, insulation, non-magnetism, high strength, low density and other features. In the application of bearing, it possesses low friction, low temperature rise, high rigidity, low centrifugal force and other features. It can implement high speed, high precision, high temperature, high rigidity, corrosion resistance and other good features.
The high precision and high performance silicon nitride bearing ball is manufactured by  spray-drying process, near-net-shape, cold isotatic pressing, GPS-HIP combined sintering, compounded abrasive lapping process effectively. The precision grade of it is G5, the materials class is I.


ZYS Si3N4 ceramic ball material grades

Class Item		Materials class
		I	II	III
Property	Bending strengthσ3.40(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
The limit does of fiber structure	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
The maximum of inclusion of transverse section every Square centimeter	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

Examples of Si3N4 ceramic ball's common applications

	G3	G5	G10 G16	G20 G28 G40
Class I	High speed power equipment Space mechanism Aircraft instrument	Liquid oxygen pump Active shaft bearing	The key parts of aerospace equipment
Class II	Molecular turbo-pump High precision star bearing	Vacuum equipment, high speed instrument, mechanical devices, high performance and the most advanced contacting spherical propeller	Motor, medium-low precision star bearing	Testing bearing ball, separating bearing ball
Class III			Sport, entertainment, food processing	Mechanical devices

ZYS Si3N4 ceramic ball specifications

The nominal diameter of bearing ball		The nominal diameter of bearing ball		The nominal diameter of bearing ball
mm	in	mm	in	mm	in
	1/32	5		8.731	11/32
0.8		5.5		9.525	3/8
1		5.556	7/32	11.112	7/16
1.588	1/16	5.953	15/64	12.303	31/64
2		6		12.7	1/2
2.381	3/32	6.35	1/4	13.494	17/32
2.5		6.5		14.288	9/16
3		6.747	17/64	15.081	19/32
3.969	5/32	7		15.875	5/8
4		7.144	9/32	19.05	3/4
4.5		7.5		25.4	1
4.762	3/16	7.938	5/16	31.75	1 1/4

Note:  The special specification can be manufactured after negotiating

 

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