Nickel-containing powder metallurgy material for gear and preparation method thereof

A powder metallurgy and gear technology, applied in the field of powder metallurgy materials for nickel-containing gears and their preparation, can solve the problems of inferior dimensional accuracy, non-dense characteristics of parts, and performance of powder metallurgy parts that are inferior to forging, so as to improve the refining effect, The effect of increased surface hardness, yield strength and impact strength

Inactive Publication Date: 2020-04-17
WUXI HENGTELI METAL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, part of the performance of powder metallurgy parts is not as good as forging and some casting parts, such as ductility and impact resistance; although the dimensional accuracy of the product is good, it is not as good as the dimensional accuracy of some finished products; the non-dense characteristics of the parts will affect post-processing The influence of treatment, especially in heat treatment, electroplating and other processes must consider the influence of this characteristic

Method used

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  • Nickel-containing powder metallurgy material for gear and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step (1): Get the following raw materials respectively by weight percentage: zinc borate 0.08%, graphite powder 0.6%, boron-copper alloy powder 1.8%, nickel oxide 0.1%, iron powder surplus, the weight percentage sum of each composition is 100 %; the above-mentioned raw materials are mixed at high speed, and mixed until the above-mentioned materials are uniform; the raw materials are ball-milled with a ball mill, the ball-to-material ratio is 55:1, and the ball-milling time is 4.5h; step (2): the powder metallurgical material after ball milling Press molding, put the powder metallurgy material into the mold, pressurize the mold until the pressure is 625MPa, and press until the density of the above material is 7.8g / m3; step (3): put the powder metallurgy material after pressing High-temperature sintering, the high-temperature sintering temperature is divided into two stages, the first stage temperature is 845°C, sintering for 3 hours, and the temperature of the second stag...

Embodiment 2

[0022] Step (1): Get the following raw materials respectively by weight percentage: zinc borate 2%, graphite powder 0.3%, boron-copper alloy powder 3.2%, nickel oxide 0.3%, iron powder surplus, the weight percentage sum of each composition is 100 %; the above-mentioned raw materials are mixed at high speed, and mixed until the above-mentioned materials are uniform; the raw materials are ball-milled with a ball mill, the ball-to-material ratio is 35:1, and the ball-milling time is 3.5h; step (2): the powder metallurgy material after ball milling Press molding, put the powder metallurgy material into the mold, pressurize the mold until the pressure is 535MPa, and press until the density of the above material is 5.5g / m3; step (3): put the powder metallurgy material after pressing High-temperature sintering, the high-temperature sintering temperature is divided into two stages, the first stage temperature is 780°C, sintering for 3 hours, and the temperature of the second stage is r...

Embodiment 3

[0024] Step (1): Get the following raw materials respectively by weight percentage: zinc borate 0.38%, graphite powder 0.5%, boron-copper alloy powder 2.2%, nickel oxide 1%, iron powder surplus, the weight percentage sum of each composition is 100 %; the above-mentioned raw materials are mixed at high speed, and mixed until the above-mentioned materials are uniform; the raw materials are ball-milled with a ball mill, the ball-to-material ratio is 55:1, and the ball-milling time is 4.5h; step (2): the powder metallurgical material after ball milling Press molding, put the powder metallurgy material into the mold, pressurize the mold until the pressure is 625MPa, and press until the density of the above material is 7.8g / m3; step (3): put the powder metallurgy material after pressing High-temperature sintering, the high-temperature sintering temperature is divided into two stages, the first stage temperature is 845°C, sintering for 3 hours, and the temperature of the second stage ...

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Abstract

The invention discloses a nickel-containing powder metallurgy material for a gear. The material comprises the following components of, in percentage by weight, 0.08%-2% of zinc borate, 0.3%-0.6% of graphite powder, 1.8%-3.2% of boron-copper alloy powder, 0.1%-1% of nickel oxide, and the balance iron powder. The preparation method comprises the following steps of (1) performing ball milling on theraw materials by using a ball mill, wherein the ball-to-material ratio is 35:1-55:1, and the ball milling time is 3.5 h-4.5 h; (2) putting the powder metallurgy material into a die, pressurizing the die to 535-625 MPa, and pressing until the density is 5.5-7.8 g/m3; and (3) sintering the pressed and formed powder metallurgy material at high temperatures, wherein the temperature at the first stageis 780-845 DEG C, sintering for 3 h, the temperature at the second stage is 940-990 DEG C, sintering for 3 h, and cooling to obtain the powder metallurgy material for the gear. The yield strength andimpact strength of the powder metallurgy material can be improved by using the preparation method.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a powder metallurgy material for nickel-containing gears and a preparation method thereof. Background technique [0002] Powder metallurgy sintering is carried out below the melting point of the base metal, so most refractory metals and their compounds can only be produced by powder metallurgy at present; the non-compactness of powder metallurgy compression is conducive to controlling product density and porosity Porous materials, containing bearings, anti-friction materials, etc. are prepared at a high rate; the size of powder metallurgy pressed products is infinitely close to the final product size (no machining or small amount of processing is required). The material utilization rate is high, so it can greatly save metal and reduce product costs; powder metallurgy products are produced by pressing the same mold, and the consistency between workpieces is good, which is suitable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/08C22C33/02B22F1/00B22F3/02B22F3/10
CPCC22C38/002C22C38/16C22C38/08C22C33/0264B22F3/02B22F3/1017B22F1/105
Inventor 邹勇平吕廷镇
Owner WUXI HENGTELI METAL PROD
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