Low-temperature sintering method for high-performance Fe-based powder metallurgy parts

An iron-based powder metallurgy and low-temperature sintering technology, applied in the field of powder metallurgy, can solve the problems of high requirements and losses of sintering furnaces, increase production costs, and few research reports, and achieve the advantages of increasing raw material costs, prolonging service life, and broadening application fields. Effect

Active Publication Date: 2013-05-08
溧阳常大技术转移中心有限公司
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Problems solved by technology

[0004] Traditional iron-based powder metallurgy parts are sintered at 1120oC or even higher temperature. However, sintering at high temperature will not only increase the production cost, but also easily lead to coarse grains and shrinkage and deformation of parts. At the same time, high temperature sintering The requirements and loss of the sintering furnace are high, therefore, reducing the sintering temperature is an important method to expand the iron-based powder metallurgy process. It is reported that nano-scale CaCu 3 Ti 4 o 12 The method of dry pressing into green bodies and then sintering the green bodies to obtain high dielectric ceramic materials can effectively reduce the sintering temperature of ceramic materials, but there are few research reports on low-temperature sintering in iron-based powder metallurgy technology

Method used

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  • Low-temperature sintering method for high-performance Fe-based powder metallurgy parts
  • Low-temperature sintering method for high-performance Fe-based powder metallurgy parts
  • Low-temperature sintering method for high-performance Fe-based powder metallurgy parts

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Experimental program
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Effect test

Embodiment 1

[0028] Mix 0.5~0.8wt.% mold release agent and the rest is common iron powder evenly and press to shape, then sinter at 1120oC for 3h and then cool with the furnace.

[0029] figure 1 It is the surface morphology of iron-based powder metallurgy parts without adding nano-copper powder after sintering at 1120oC, and the black area is the surface porosity. It can be seen that the surface sintered at 1120oC is relatively dense, and iron-based powders can be effectively bonded at this temperature At the same time, it can also be seen that there are certain irregular pores on the surface, in which the grain diameter is between 30 and 80 μm, and a small amount of grain diameter reaches 100 μm.

[0030] figure 2 SEM fracture morphology of iron-based powder metallurgy parts without nano-copper powder added after sintering at 1120oC, from which it can be observed that there are a certain number of dimples on the fracture surface, which has a certain degree of plasticity, and it can be ...

Embodiment 2

[0035] Mix 0.5~0.8wt.% mold release agent and the rest is common iron powder evenly and press to shape, then sinter at 880oC for 3h and then cool with the furnace.

[0036] image 3 It is the surface morphology of iron-based powder metallurgy parts without adding nano-copper powder after sintering at 880oC, and figure 1 In comparison, it can be seen that there are a large number of pores on the surface of the part, and most of the pores exist at the grain boundary, the grain size is 30 μm to 150 μm, and the number of large-sized grains increases.

[0037] Figure 4 The SEM fracture morphology of the green body of iron-based powder metallurgy parts without adding nano-copper powder, and figure 2 In comparison, a large number of dissociated surfaces and a certain number of cracks can be seen, indicating that the interior of the unsintered part is only the mechanical interlocking between powders, without the bonding between atoms, the corresponding performance requirements can...

Embodiment 3

[0043] 0.5~0.8wt.% mold release agent, 0.1~0.5wt.% nano-copper powder, and the rest are ordinary iron powder mixed evenly and pressed into shape, then sintered at 880oC for 3 hours and then cooled with the furnace.

[0044] Figure 6 In order to add 0.3wt.% nano-copper powder to the surface morphology of iron-based powder metallurgy parts after sintering at 880oC, and figure 1 The difference is: firstly, the pores on the surface of the parts added with nano-copper powder are dispersed and evenly distributed in the structure (grain boundary and inside the grains), without forming large polygonal pores; secondly, there are more near-spherical isolated pores; , the grain size is also small, mostly in the range of 30~50μm, and its corresponding properties are listed in Table 3.

[0045] Figure 7 SEM fracture morphology of iron-based powder metallurgy parts added with 0.3wt.% nano-copper powder after sintering at 880oC, a large number of dimples can be seen, indicating that the ...

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Abstract

A low-temperature sintering method for high-performance Fe-based powder metallurgy parts belongs to the technical field of powder metallurgy. In order to reduce the sintering temperature of the Fe-based powder metallurgy parts and improve the performance of the Fe-based powder metallurgy parts at the same time, the low-temperature sintering method adopts the scheme that nanocrystalline copper powders are added to common Fe-based powder metallurgy parts, obvious surface effect and small size effect of the nanocrystalline copper powders are utilized to reduce the sintering temperature and improve the performance of the parts at the same time; and in order to ensure that the added nanocrystalline copper powders and added release agents can be mixed with basal ferrous powders uniformly, the Fe-based powder metallurgy parts satisfying the performance requirements can be obtained through combining with effective cold-pressing and sintering technology within appropriate powder mixing time under lower temperature. By adopting the low-temperature sintering method, the sintering temperature in the Fe-based powder metallurgy technology is reduced by about 240 DEG C, the production efficiencyis effectively improved, meanwhile, the energy consumption is reduced and the service life of production equipment is prolonged, and higher economic benifits and social benefits are achieved; in addition, the performance can also improved, so that the low-temperature sintering method plays a pushing effect in development of expanding the application field of the Fe-based powder metallurgy parts.

Description

Technical field [0001] The invention involves a low -temperature sintering method of high -performance iron -based powder metallurgy, which is the field of powder metallurgy technology. Background technique [0002] In recent years, the technology and economic advantages of powder metallurgical technology have become increasingly recognized by people, the use of powder metallurgy mechanical parts has become wider and wider, and the market coverage is getting wider and wider; especially the demand for iron -based powder metallurgical partsWith the development of the automotive industry, the traditional iron -based powder metallurgical parts have caused a certain environmental pollution due to sintering at high temperatures, which waste energy and losses.Environmental protection has become the theme of modern life. Therefore, how to reduce the sintering temperature of powder metallurgical parts under the premise of ensuring performance has gradually paid attention to it. [0003] S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F1/00
Inventor 吴昆鹏刘澄许鹏胡静陈智慧
Owner 溧阳常大技术转移中心有限公司
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