Composite metal powder for sintered bearing, and sintered oil retaining bearing
A sintered bearing and composite metal technology, which is applied in the field of composite metal powder for sintered bearings and oil-impregnated sintered bearings, can solve the problems of increasing prices, reducing the strength of sintered bodies, increasing costs, etc. Effect of stabilizing sliding performance
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Embodiment 1
[0016] The specific embodiments of the present invention described above will be described together with their comparative examples. First, the iron powder used by the present inventors has a copper coating of 20% by weight, a particle size of -80 mesh, and a specific surface area of 573 cm. 2 / g, it is processed into a cylindrical pressed powder with an inner diameter of 6mm, an outer diameter of 12mm, and a height of 4mm as an embodiment and a comparative example, and is sintered in ammonia decomposition gas at 1000°C for 30 minutes.
[0017] The obtained sintered bodies were subjected to normal shape finishing and oil immersion treatment to produce bearing bodies with an oil content of 20% by volume, and these bearing bodies were subjected to a bearing test under the following conditions.
[0018] Shaft material: S45C raw material
[0019] Load: 0.81N / mm 2 , 1.63N / mm 2 , 3.26N / mm 2
[0020] Sliding speed: 52.9m / min
[0021] Impregnated Oil: Mineral Oil 32cst
[0022...
Embodiment 3
[0031] Also to the powder of Example 1, 1.8% by weight of tin powder is added, under the same conditions as in Example 1 above, a sintered body of the same shape is made, sintered at a sintering temperature of 860° C., and then this sintered body The bearing characteristics and oil content are shown in Tables 1 and 2 above.
Embodiment 4
[0033] 0.5% by weight of graphite powder was added to the powder of Example 1, and under the same conditions as in Example 1, a sintered body of the same shape was produced. The bearing properties and oil content of this sintered body are listed in Tables 1 and 2 above.
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