what kind of carbon brush can used in Railway locomotives and oil fields?

 what kind of carbon brush can used in Railway locomotives and oil fields?

-Graphite carbon brush T900 ,CE7,DE7000 for Railway locomotives and oil fields with 2(9.5*43*70)mm

Grade	resistivity (μΩ·m)	DENSITY (g/cm^3)	Hardness	FRICTION  COEF.	rating Current density (A/cm2)	Allowable rim speed(m/s)
DE7000	48	1.7	83	0.1	15	51

Production and processing according to drawings Application scope: Oilfield kowtow machine Introduction: The main components are various carbon powder materials such as carbon black, coke, and graphite. After high-temperature treatment at 2500 degrees, they are transformed into microcrystalline artificial graphite. This type of carbon brush has excellent commutation and self-lubricating performance, The function of carbon brushes The brush motor is mounted on the surface of the inverter, and when the motor rotates, it delivers electrical energy to the coil through the inverter. Due to its main component being carbon, it is called a carbon brush, which is prone to wear and tear. Regular maintenance and replacement should be carried out, and carbon deposits should be cleaned up.

>Copper graphite:
J102, J105, C42, C412, J164, J201, H0505, H0507, H71, J203, J204, J205, J206,
J210, J213, J215, J230, J239, J240, J412, J453, CM5B, CM8100
>Silver and graphite:
J390-1, J390, J385, J385, J380, J375, J370, J360, J350, J325
>Electrochemical graphite:
D104, D172, D172NM, D213, D214, D252, D308, D308L, D312, D374B, D374L,
D374F, D374N, D374S, D376, D376N, D376Y, CH17, CH33N
>Resin graphite:
S4, S31, R015, R211
>Natural graphite:
S3, S6, S6M, S27, S28, NCC63