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Method for forming bonded iron-based powder by high velocity compaction technology

An iron-based powder, high-speed pressing technology, applied in the field of powder metallurgy, can solve problems such as industrial application limitations, and achieve the effects of improving fluidity, uniform mixing, and uniform alloy composition

Active Publication Date: 2012-07-11
YANGZHOUSSHINE POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need for additional special equipment, the warm powder high-speed pressing technology will be greatly limited in its industrial application

Method used

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  • Method for forming bonded iron-based powder by high velocity compaction technology
  • Method for forming bonded iron-based powder by high velocity compaction technology
  • Method for forming bonded iron-based powder by high velocity compaction technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: High-speed pressing of plasticized iron-based powder (Fe-Ni-Cu-C alloy)

[0021] The nominal composition of the iron-based alloy is Fe-1.5Ni-0.5Cu-0.25C (mass fraction). Using water atomized iron powder as raw material, the particle sizes of Ni, Cu and C powder are 2-5μm, 3-6μm and 0.5-7μm, respectively. The water atomized iron powder of two particle sizes is matched, the particle size of the coarse powder is 130-150μm, the particle size of the fine powder is 50-90μm, and the mass ratio of the coarse powder to the fine powder is 3:1. According to the particle size matching requirements and the iron-based alloy composition, the alloy element powder is added to the water atomized iron powder and the uniform mixing time is 3 hours on the planetary ball mill. Then, 0.8 wt.% of plasticizer is added to the pre-mixed powder, followed by a bonding treatment, and after mixing for 5 hours, a bonded iron-based powder is obtained. The bonded iron-based powder is plasticiz...

Embodiment 2

[0022] Example 2: High-speed pressing of plasticized iron-based powder (pure Fe)

[0023] The water atomized iron powder of two particle sizes is matched, the particle size of the coarse powder is 130-150μm, the particle size of the fine powder is 50-90μm, and the mass ratio of the coarse powder to the fine powder is 3:1. Pre-mix the mixed powders of coarse and fine particle sizes on a planetary ball mill, and the mixing time is 2 hours. Then, 0.4 wt.% of plasticizer is added to the pre-mixed powder, and then mixed for 3 hours to obtain a cemented iron-based powder. The cemented iron-based powder is plasticized at 750°C in a hydrogen atmosphere. The heating process is as follows: heating to 200°C at a heating rate of 1°C / min, holding for 1 hour, and then heating at a heating rate of 5°C / min After the temperature reaches 450°C, it is kept for 1 hour, and finally heated to the final temperature of 750°C at a heating rate of 15°C / min, and then kept for 2 hours to obtain the plastic...

Embodiment 3

[0024] Example 3: High-speed pressing of plasticized iron-based powder (Fe-P alloy)

[0025] The nominal composition of the iron-based alloy is Fe-0.35wt.%P (mass fraction). Using water atomized iron powder as the raw material, the particle size of the iron-phosphorus alloy powder is 4-10μm. The water atomized iron powder with two particle sizes of coarse and fine particles is matched, the particle size of the coarse powder is 130-150μm, the particle size of the fine powder is 50-90μm, and the mass ratio of the coarse powder to the fine powder is 4:1. According to the particle size matching requirements and the iron-based alloy composition, the alloy element powder is added to the water atomized iron powder and pre-mixed on a planetary ball mill. The mixing time is 2 hours. Then, 0.6 wt.% of plasticizer was added to the pre-mixed powder, and then mixed for 3 hours, and the heating rate during the plasticizing treatment was 10° C. / min to obtain the cemented iron-based powder. Th...

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Abstract

The invention relates to a method for forming bonded iron-based powder by a high velocity compaction technology, and belongs to the technical field of powder metallurgy. Coarse and fine water-atomized iron powder with different particle sizes are matched, and the mass ratio of the coarse powder to the fine powder is 2:1 to 4:1. In accordance with the particle size matching requirement and the iron-based alloy composition ratio, Ni, Cu, C and iron-phosphorus alloy powder are added into the water-atomized iron powder and then are uniformly pre-mixed with the water-atomized iron powder in a planetary ball mill. 0.3 to 0.8wt. % of plasticizer is added into the pre-mixed powder and then is mixed with the pre-mixed powder for 2 to 5 hours to obtain the bonded powder. The bonded powder is heatedto 600 to 950 DEG C by using a multi-stage heating process to be subjected to plasticizing treatment to obtain plasticized iron-based powder. The plasticized iron-based powder is pressed by a high-speed forming press to obtain a high-density compac. The compact is sintered at a temperature of 1100 to 1250 DEG C in a hydrogen atmosphere for 2 to 5 hours to obtain a high-density powder metallurgy iron-based material. The method integrates the advantages of powder modification treatment, die wall lubrication and high-speed pressing, and is more suitable for preparing the high-density powder metallurgy iron-based material.

Description

Technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular provides a method for preparing high-density powder metallurgy iron-based materials by combining powder modification treatment, mold wall lubrication and high-speed pressing. Background technique [0002] Powder metallurgy iron-based products are widely used in automobiles, machinery, chemicals, electronics and other fields due to their technical and economic advantages. Among them, the automobile industry is the main user of powder metallurgy parts. With the continuous and rapid growth of my country's automobile industry, the demand for powder metallurgy products is increasing, and the performance requirements are getting higher and higher. When the density of powder metallurgy iron-based parts is greater than 7.4g / cm 3 Later, its hardness, tensile strength, fatigue strength, toughness and magnetic properties will increase significantly with the increase in density. The d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02B22F1/00
Inventor 曲选辉章林秦明礼何新波尹海清
Owner YANGZHOUSSHINE POWDER METALLURGY
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