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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Present and prospect of powder for oil bearing (3) Current Status and Prospects of Powders for Oil Bearings (III)
1. Songbi Gao's leading copper powder production process is to roast, oxidize or oxidize the atomized powder; and then to recover the atomized iron powder similarly internally recovered by the high-temperature recovery; the pine ratio is usually 2.3 to 2. 5g/cm3; and the atomized copper powder looseness ratio obtained by the current domestic process is usually 2. 7~3. 0g/cm3; the relatively small compression ratio leads to poor green strength. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
2. The high oxygen content is similar to the reconstituted iron powder; the oxygen content of the domestic atomized copper powder is high under the constraint of the recovery furnace; the strength after sintering is low and the compactness of the powder is poor.
3. Bronze powder Because the current skill of atomizing bronze powder is not yet sophisticated; copper tin dispersing powder or copper-tin mixed powder is used more at this stage. Domestically, according to the dispersed bronze powder of atomized copper powder, there is a high ratio of pine to high. High oxygen content and low sintering strength;
1. Similar to atomized bronze powder; pine ratio and oxygen content are higher,
2. Because the tin powder is dispersed outward or other causes during sintering; the appearance of the product after sintering has a "green" color; affecting the appearance of the product,
3. The strength after sintering is low. Generally, the sintered strength of imported powder is 21kg/cm2; the current domestic powder is only 17kg/cm2; the relatively low sintering strength constrains the use range of domestic copper powder.
4. Sintering scale stability is poor. When copper powder and tin powder are mixed; because the tin powder is thin and simple, segregation occurs; the same batch of products is large or small or the same product is severely deformed during sintering; the accuracy of the scale after shaping is severely affected.
5. The porosity of the closed copper powder is high. Although the shape of the domestic copper powder is irregular, the whole surface looks like lubrication; the inside of the particle does not constitute pores; the closed porosity of the oil bearing is higher than that of the oil bearing; the product with the same density shows the appearance of lack of oil content.
We hope that domestic copper powder can overcome the above problems; compete for the level of copper powder arriving abroad; break the situation of the world in the high-end copper powder shopping mall.
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Current Status and Prospects of Powders for Oil Bearings (III)
Source: Bearing network time: 2014-10-19