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NTN has now successfully developed the world's first “Corrosion Resistance BEARPHITE” that delivers outstanding corrosion resistance using aluminum bronze without the need to use nickel.
[ Features ]
Compared to white cooper materials
(1) Same or better corrosion resistance
No patina (rust) generated in JIS salt spray test
(2) Same 0.1 or less coefficient of friction
(3) 9-times or more wear resistance
Motorized fuel pumps and exhaust gas recirculation devices (EGR*1) for automobiles and motorcycles are generally equipped with bronze sintered bearings or white cooper sintered bearings. Bronze sintered bearings become corroded by the organic acids contained within gasoline, while white cooper sintered bearings need to use expensive nickel.
Aluminum bronze is a material that features outstanding corrosion resistance, however it forms an oxide on its surface under high temperatures, which until now meant it was not suited to powdered metal sintering. NTN has reviewed the composition of the material used, and developed the manufacturing process technology to improve the sintering performance for a level of corrosion resistance that is the same or better than white cooper materials. The friction coefficient has been reduced by including an optimum quantity of graphite within the material, which has drastically improved wear resistance.
NTN has already started to propose the developed product to manufacturers in the automotive industry, and in the future will propose the product in industrial machinery fields where bearings are used in corrosive environments such as salt water.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7004ADF NSK | 20 | 42 | 12 |
| 7904CDF NSK | 20 | 37 | 9 |