Method for improving the properties of sintered manganin-copper damping alloy using nickel carbonate
A technology of damping alloy and nickel carbonate, which is applied in the field of atmosphere sintered porous structure manganese-copper high damping alloy, can solve the problems of excessive liquid phase and unfavorable shape stability of sintered body, and achieve the effect of good uniformity
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Embodiment 1
[0032] Powders such as manganese, copper, iron, aluminium, tin, carbon, silicon and nickel carbonate are batched according to the composition of Table 2 Example 1. Place the prepared powder in a ball mill tank for dry milling, and the ball milling time is about 2 hours until the powder is uniform.
[0033] Table 2 Composition range (mass percentage) of the manganin-copper damping alloy of the embodiment
[0034] alloy element
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6
Example 7
mn
59.3
47.2
60
52
52
75
76.6
Cu
33
39
35.9
35.9
35.7
18
17
Al
3.0
6.0
2.0
1.0
4.0
/
/
Fe
2.4
3.2
1.0
4.0
3.0
2
1.8
Ni*
0.8
3.2
0.3
2.2
2.5
5
4.6
sn
0.18
1.2
/
/
/
/
/
Cr
/
/
/
/
0.6
/
/
Mo
/
/
0.2
0.9
/
/
/
Zn
/
/
0...
Embodiment 2
[0042] Powders such as manganese, copper, iron, aluminum, tin, carbon, silicon and nickel carbonate are batched according to the composition of Table 2 Example 2. Put the prepared powder into a ball mill tank for dry milling, and the ball milling time is about 3 hours until the powder is uniform.
[0043] The mixed powder was pressed into a green compact under a pressure of 300 MPa using a circular die.
[0044] Pyrolysis, reduction and sintering under the protection of flowing dry hydrogen, the specific steps are 300°C for 4 hours; 400°C for 4 hours; 850°C for 4 hours; heating rate 5°C / min. With the cooling of the furnace, the sintered manganese copper is subjected to solid solution and aging treatment to obtain the product. The properties of the obtained sintered compacts are listed in Table 3. The shape of the fracture is as figure 2 shown.
Embodiment 3
[0046] Manganese, copper, iron, aluminum, molybdenum, zinc powder and nickel carbonate are batched according to the composition of Table 2 Example 3. Put the prepared powder into a ball mill tank for dry milling, and the ball milling time is about 0.5h until the powder is uniform.
[0047] The mixed powder was pressed into a compact under a pressure of 500 MPa using a circular pressing die.
[0048] Pyrolysis, reduction and sintering under the protection of flowing dry hydrogen, the specific steps are 400°C for 2 hours; 450°C for 3 hours; 900°C for 2 hours; heating rate 8°C / min. With the cooling of the furnace, the sintered manganese copper is subjected to solid solution and aging treatment to obtain the product. The properties of the obtained sintered compacts are listed in Table 3.
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