Composite metal powder for sintered bearing, and sintered oil-retaining bearing
A technology for sintered bearings and composite metals, which is applied in the field of composite metal powder for sintered bearings and oil-containing sintered bearings, can solve the problems of increasing prices, reducing the strength of sintered bodies, and increasing costs, and achieves lower temperature rise, simple molding operations, and The 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 32 cst
[002...
Embodiment 2
[0030] To the powder of Example 1 above, 1.0% by weight of tin powder was added, and under the same conditions as in Example 1, a sintered body of the same shape was produced. The bearing properties of the sintered body are shown in Table 1 above, and the oil content, strength, hardness and air permeability are shown in Table 2.
Embodiment 3
[0032] 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.
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