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In-situ sintered dispersion particle-reinforced warm-compacting powder metallurgy material and preparation method thereof

A particle enhancement, powder metallurgy technology, applied in the field of powder metallurgy, can solve the problems of deterioration of iron-based powder metallurgy materials, difficulty in sintering and densification, uneven composition, etc., and achieve the effects of increasing strength, improving compressibility and uniform distribution

Active Publication Date: 2012-02-08
常熟市华德粉末冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former has interface pollution in the production process, and it is difficult to sinter and densify
The latter is easy to cause problems such as uneven composition, particle growth and element burning during the casting process, which deteriorates the performance of iron-based powder metallurgy materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Ingredients

[0030] Calculated according to the percentage of the total mass of powder metallurgy iron-based warm compacted powder: 2% nickel carbonyl powder, 0.5% ferromolybdenum powder, 2% electrolytic copper powder, 1% titanium powder, and the rest is prepared as atomized iron powder;

[0031] Step 2: Mixing

[0032] Dry mix in a V-shaped high-efficiency mixer for 45 minutes;

[0033] Step 3: Partial pre-alloying treatment

[0034] Annealed at 700°C for 2 hours under the protection of hydrogen, then crushed, ground, and passed through a 100-mesh sieve specified in GB / T6005;

[0035] Step 4: Add lubricant and mix

[0036] Add 0.45% graphite powder in the above powder, then add 0.4% stearic acid amide by mass percentage on its basis, mix in V-shaped powder mixer for 45 minutes;

[0037] Step 5: Warm and Press

[0038] Heat the above homogeneously mixed powder to 90°C under a nitrogen protective atmosphere, and press to shape at 600MPa;

[0039] Step 6: S...

Embodiment 2

[0043] Step 1: Ingredients

[0044] Calculated according to the percentage of the total mass of powder metallurgy iron-based warm compacted powder: 3% nickel carbonyl powder, 0.8% ferromolybdenum powder, 1.0% electrolytic copper powder, 2% titanium powder, and the rest is prepared by atomized iron powder;

[0045] Step 2: Mixing

[0046] Dry mix in a V-shaped high-efficiency mixer for 30 minutes;

[0047] Step 3: Partial pre-alloying treatment

[0048] Annealed at 850°C for 1 hour under the protection of hydrogen, then crushed, ground, and passed through a 100-mesh sieve specified in GB / T6005;

[0049] Step 4: Add lubricant and mix

[0050] Add 0.7% graphite powder to the above powder, then add 0.2% Ake wax by mass percentage on its basis, and mix in a V-shaped powder mixer for 30 minutes;

[0051] Step 5: Warm and Press

[0052] Heat the homogeneously mixed powder above to 110°C under nitrogen protection atmosphere, and press to shape at 500MPa;

[0053] Step 6: Sintering...

Embodiment 3

[0057] Step 1: Ingredients

[0058] Calculated according to the percentage of the total mass of powder metallurgy iron-based warm compacted powder: 3% nickel carbonyl powder, 1.0% ferromolybdenum powder, 1.8% electrolytic copper powder, 4% titanium powder, and the rest is prepared by atomized iron powder;

[0059] Step 2: Mixing

[0060] Dry mix in a V-shaped high-efficiency mixer for 30 minutes;

[0061] Step 3: Partial pre-alloying treatment

[0062] Annealed at 650°C for 2 hours under the protection of hydrogen, then crushed, ground, and passed through a 100-mesh sieve specified in GB / T6005;

[0063] Step 4: Add lubricant and mix

[0064] Add 1.2% graphite powder to the above-mentioned powder, then add a mixture of 0.15% stearic acid amide and 0.15% Ake wax on the basis of it, and mix in a V-shaped powder mixer for 30 minutes;

[0065] Step 5: Warm and Press

[0066] Heat the above homogeneously mixed powder to 100°C under nitrogen protection atmosphere, and press to s...

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Abstract

The invention relates to a dispersion particle-reinforced warm-compacting iron-based powder metallurgy material based on in-situ sintering synthesis and a preparation method thereof. The warm-compacting iron-based powder comprises the following main components in percentage by weight: 2-3% of nickel, 0.3-0.6% of molybdenum, 1-2% of copper, 1-4% of titanium, 0.45-1.2% of carbon and the balance of ferrum. The method for preparing the warm-compacting iron-based powder by an in-situ particle sintering synthesis technology comprises the following steps: blending materials; mixing materials; pre-alloying the mixed part; screening; adding a lubricating agent and mixing; warm-compacting; and finally sintering. During the press forming process of the warm-compacting iron-based powder at the temperature of 90-110 DEG C under the pressure of 500-700MPa, the density of the powder can be up to more than 93% of the theoretical density, and the power has the advantages of good compressibility and high rate of finished products; in the warm-compacting iron-based powder, the TiC dispersion particles with the particle size of 0.05-1mu m are well bonded with a matrix interface and are uniformly distributed; and under the dispersion strengthening action of the TiC particles, with respect to the material, the mechanical properties are improved, the hardness can reach 74-82HRB (Rockwell hardness), the bending strength can reach 480-650MPa, and the wear resistance is improved by 1.2-2.8 times compared with that of the common non-warm-compacting iron-based powder metallurgical sintering material.

Description

technical field [0001] The invention relates to an in-situ sintered dispersed particle reinforced warm-pressed powder metallurgy material and a preparation method thereof, belonging to the technical field of powder metallurgy. Background technique [0002] In recent years, higher requirements have been put forward for existing iron-based powder metallurgy materials: on the one hand, high strength and certain toughness are required; on the other hand, high wear resistance and fatigue strength are required. However, the density of traditional iron-based powder metallurgy products is generally 7.10g / cm 3 , its strength, toughness and fatigue properties are often difficult to meet the requirements of high-performance powder metallurgy parts. At present, the methods to increase the density of powder metallurgy products mainly include recompression and refiring technology (P2S2), powder forging technology (P / F), high-speed compaction technology (HVC) and warm compaction technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00
Inventor 刘子利邹育文蒋晓冬邹德华刘希琴
Owner 常熟市华德粉末冶金有限公司
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