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Method for modifying performance of sintered Mn-Cu damping alloy with ferrous oxalate

A technology of ferrous oxalate and sintered alloy, which is applied in the field of atmosphere sintered porous structure manganese-copper high damping alloy, which can solve the problems of excessive liquid phase and unfavorable shape stability of sintered body, and achieve good uniformity

Active Publication Date: 2017-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A solid solution of a certain concentration formed by the diffusion of elemental Mn and Cu elements will appear in a transient liquid phase at a temperature above 871 ° C, thereby playing the role of liquid phase sintering and obtaining a higher-strength alloy; but the sintering temperature exceeds 950 ° C will cause liquid phase Too much is not conducive to the shape stability of the sintered body

Method used

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  • Method for modifying performance of sintered Mn-Cu damping alloy with ferrous oxalate
  • Method for modifying performance of sintered Mn-Cu damping alloy with ferrous oxalate
  • Method for modifying performance of sintered Mn-Cu damping alloy with ferrous oxalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Manganese, copper, nickel, aluminum, tin, carbon, silicon and other powders and ferrous oxalate are batched according to the ingredients in Table 2 Example 1. Table 2 Composition range (mass percentage) of the manganin-copper damping alloy of the embodiment

[0030] 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 / / 0.6 4.0 2.0 / / C 0.16 0.10 / / 0.08 / / Si 0.18 0.10 / / 0.12 / /

[0031] * is the content of iron element, the amount of ferrous oxalate needs to be calculated according to the mass ratio of Fe contained in it.

[0032] Place the prepared powder in a ball mi...

Embodiment 2

[0039] Powders such as manganese, copper, nickel, aluminum, tin, carbon, silicon and ferrous oxalate 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.

[0040] The mixed powder was pressed into a green compact under a pressure of 300 MPa using a circular die.

[0041] Under the protection of flowing dry hydrogen, pyrolysis, reduction and sintering, the specific steps are 180°C for 4 hours; 400°C for 4 hours; 750°C for 2 hours; then 900°C for 4 hours; heating rate 5°C / minute. 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. figure 1 The bending strength curve of the product.

Embodiment 3

[0043] Manganese, copper, nickel, aluminum, molybdenum, zinc powder and ferrous oxalate 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.

[0044] The mixed powder was pressed into a compact under a pressure of 500 MPa using a circular pressing die.

[0045] Under the protection of flowing dry hydrogen, pyrolysis, reduction and sintering, the specific steps are 220 ° C for 2 hours; 460 ° C for 2 hours; 800 ° C for 1 hour; then 950 ° 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. figure 1 The bending strength curve of the product.

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Abstract

The invention discloses a method for modifying the performance of a sintered Mn-Cu damping alloy with ferrous oxalate. According to the method, sintering is promoted by high-activity iron produced by pyrolysis and hydrogen reduction of the ferrous oxalate, H2O, CO2 and other gases released during pyrolysis and hydrogen reduction of the ferrous oxalate can prevent a compact sealing layer from being formed on the surface of a sintered blank, and pyrolysis, reduction and sintering are performed under the action of hydrogen. Dehydration is performed at 180-240 DEG C with the heat preservation time of 1-4 h; pyrolysis is performed at 400-500 DEG C with the heat preservation time of 1-4 h; reduction is performed at 750-850 DEG C with the heat preservation time of 1-2 h; then a sintering process is finished at 850-950 DEG C with the heat preservation time of 2-4 h; and the heating speed is 5-10 DEG C / min. The sintered Mn-Cu damping alloy prepared according to the method reaches the diameter of 100 mm, the length of 200 mm, the density of 5.10-5.75 g / cm<3>, the hardness of 52-86 HRF and the bending strength of 128-184 MPa and has high uniformity.

Description

technical field [0001] The invention relates to an atmosphere sintering method for manganese copper high damping alloy with porous structure. It uses ferrous oxalate as the iron element donor, uses the pyrolysis characteristics of ferrous oxalate and its decomposition products to improve the sintering process, and achieves the purpose of uniform sintering of large-scale materials. [0002] technical background [0003] As a representative of twin-type damping materials, manganese-copper alloy has been widely used in various fields of life and production. The manganese-copper damping alloy material has the antiferromagnetic transformation of manganese-copper alloy with γ-phase structure, forming lattice distortion and triggering micro-twins. If the lattice distortion induces martensitic transformation, martensitic twins will be formed. The movement of parent phase and thermoelastic martensite phase interface and the movement of thermoelastic martensite twin substructure consu...

Claims

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Application Information

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IPC IPC(8): B22F3/02B22F3/11C22C1/08C22C22/00C22C30/02C22C30/04C22C30/06C22F1/16
CPCB22F3/02B22F3/1007B22F3/1039B22F3/1143B22F3/24B22F2003/248C22C22/00C22C30/02C22C30/04C22C30/06C22F1/16
Inventor 罗丰华卢凤双张建福赵栋梁邹金住杨昊
Owner CENT SOUTH UNIV
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