Additive activated low-alloy-content iron-based powder and preparation method of sintered materials

An iron-based powder, low-alloy technology, applied in the field of preparation of iron-based powder metallurgy materials, can solve the problems of lowering sintering temperature, limited liquid phase sintering effect, etc. Simple preparation process

Inactive Publication Date: 2013-05-08
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the patent "a low-temperature sintering method for high-performance iron-based powder metallurgy parts" (patent application number: 201110070535.2) significantly reduces the sintering temperature by adding nano-copper powder to ordinary iron powder, but at the sintering temperature The solubility of copper in the matrix iron is greater than that of iron in copper, and the liquid phase sintering effect of adding nano-copper powder alone is very limited

Method used

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  • Additive activated low-alloy-content iron-based powder and preparation method of sintered materials
  • Additive activated low-alloy-content iron-based powder and preparation method of sintered materials

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water-atomized iron-molybdenum pre-alloyed powder instead of water-atomized iron powder and molybdenum powder), graphite, ultrafine cuprous phosphide powder and copper powder are used as raw materials , according to nickel 1.5wt.%, molybdenum 0.3wt.%, graphite 0.4wt.%, copper element 0.5wt%, cuprous phosphide accounts for about 0.2wt%, and 0.6wt.% lubricant ingredients, of which phosphide The particle size range of copper and copper is 0.05~0.2μm. Put each raw material into the mixing cylinder and seal it, and mix it evenly on the planetary mixer. Then carry out compression molding under the pressure of 600MPa, place the pressed green body in a hydrogen atmosphere sintering furnace, pre-fire at a temperature of 400~500°C for 0.5 hours, then raise the temperature to 650~850°C and keep it for 0.5~1 hour, and finally raise the temperature to Sintering at 1050~1200℃ for 0.5~1.5 hours, the density of t...

Embodiment 2

[0029] Water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water-atomized iron-molybdenum pre-alloyed powder instead of water-atomized iron powder and molybdenum powder), graphite, ultrafine cuprous phosphide powder and copper powder are used as raw materials , according to nickel 1.5wt.%, molybdenum 0.4wt.%, graphite 0.5wt.%, copper element 0.7wt%, cuprous phosphide accounts for about 0.4wt%, and 0.6wt.% lubricant ingredients, of which phosphide The particle size range of copper and copper is 0.1~1μm. Put each raw material into the mixing cylinder and seal it, and mix it evenly on the planetary mixer. Other conditions are the same as in Example 1, and the density of the obtained iron-based sintered material is 7.20g / cm 3 , the bending strength is 908MPa, and the hardness is 54.6HRB.

Embodiment 3

[0031] Water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water-atomized iron-molybdenum pre-alloyed powder instead of water-atomized iron powder and molybdenum powder), graphite, ultrafine cuprous phosphide powder and copper powder are used as raw materials , according to nickel 1.5wt.%, molybdenum 0.5wt.%, graphite 0.6wt.%, copper 0.9wt%, cuprous phosphide accounts for about 0.6wt%, and 0.6wt.% lubricant ingredients, of which phosphide The particle size range of copper and copper is 0.2~5μm. Put each raw material into the mixing barrel and seal it, and mix evenly on the planetary mixer. Other conditions are the same as in Example 1, and the density of the obtained iron-based sintered material is 7.21g / cm 3 , the bending strength is 916MPa, and the hardness is 55.1HRB.

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Abstract

The invention discloses an additive activated low-alloy-content iron-based powder and preparation method of sintered materials. A small amount of superfine powders of copper and phosphorization cuprous are added into atomized iron powder or alloyed powder such as nickel. The preparation method of the iron-base alloy sintered materials is that the uniform mixed power is conducted single press and single sintering for one time, or the power is conducted pre-sintering in low temperature and then is carried out re-pressing and after-combustion. The superfine phosphorization cuprous power in the iron-based mixed powder can effectively improve pressing lubricity of iron powder, facilitate balling of hole gaps in matrix in a relative low temperature, and improve density of a sintering body. The density of products which are made by single press and single sintering can achieve 7.22g per cubic centimeter on the condition of 600MPa to 700MPa, density of products which are made by re-pressing and after-combustion can achieve 7.52g per cubic centimeter under the condition of 700MPa to 800MPa, and higher mechanical property is realized.

Description

technical field [0001] The invention belongs to a method for preparing iron-based powder metallurgy materials, in particular to a method for preparing high-performance low-alloy content iron-based powder and its sintered material through the selection and design of additives. Background technique [0002] Powder metallurgy technology has the characteristics of material saving, energy saving, and mass production of parts with near-net shape and dimensional accuracy at low cost. It is a typical green manufacturing technology. [0003] Iron-based powder metallurgy materials are an important class of powder metallurgy materials. Iron-based powders and products account for 70% of the powder metallurgy market. As far as iron-based powder metallurgy products are concerned, gears are the most widely used and most representative A class of parts. Gears manufactured by powder metallurgy have the characteristics of high material utilization, controllable density, low noise level, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/16
Inventor 滕浩周科朝李志友
Owner CENT SOUTH UNIV
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