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Metallurgy powder composition

A technology of metallurgical powder and composition, applied in the field of metallurgical industrial powder, can solve the problems of low productivity, time increase, dusting, etc., and achieve the effects of excellent compressibility and filling, wide application range and low production cost

Inactive Publication Date: 2012-09-05
张晖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem is that fines, especially lower density fines such as graphite, cause dusting during handling of powder mixtures
The small particle size of the additive also creates problems related to the flow properties of the powder (i.e. the ability of the powder to behave as a free-flowing powder)
Impaired flowability manifests itself in increased time to fill the mold cavity with powder This means lower productivity and a higher risk of variations in the density of the pressed part, which can cause unacceptable deformation after sintering

Method used

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Examples

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Effect test

Embodiment Construction

[0012] Now, the present invention will be described in further detail in conjunction with preferred embodiments. The basic structure of the present invention is illustrated only in a schematic manner, so that it only shows the constituents relevant to the present invention.

[0013] A metallurgical powder composition, comprising the following raw materials by weight percentage: 85% of iron-based matrix powder, 1% of binder, 0.5% of flow agent and 23.5% of hard phase powder, and the binder is stearic acid One or more of zinc, calcium stearate and stearic acid amide, the flow agent improving particles contain 80% by mass of carbon black powder relative to the flowability improving particles, and the hard phase powder contains the following Each element Fe, Cr, Co, Ni, W, C.

[0014] In addition, in addition to the carbon black, the fluidity-improving particles also contain PMMA powder and / or PE powder, and the average particle diameter of the fluidity-improving particles is bet...

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PUM

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Abstract

The invention relates to a metallurgy powder composition, comprising the following materials by weight: 45-90% of iron-based matrix powder, 0.1-3% of adhesive, 0.001-0.5% of flowable agent and 5-25% of hard-phase powder. The adhesive is at least one or two of zinc stearate, calcium stearate and stearic acid amide. The flowable agent improved particle contains carbon black which is 50-100% of the flowable agent improved particle by mass. The hard-phase powder contains elements of Fe, Cr, Co, Ni, W and C. The metallurgy powder composition provided by the invention has the advantages of excellent compressibility and fallibility, wide application range and low production cost.

Description

technical field [0001] The invention relates to a metallurgical industrial powder, especially a metallurgical powder composition. Background technique [0002] In industry, the application of metal products made by pressing and sintering iron-based powder compositions is becoming more and more common. The quality requirements of these metal products are constantly increasing, and as a result, new powder compositions with improved properties have been developed. One of the most important properties of the final sintered product is density and dimensional tolerances, which must be consistent. Problems with dimensional variation in the final product often originate from inhomogeneities in the powder mixture to be compressed. [0003] These problems are especially pronounced for powder mixtures comprising pulverulent components of different sizes, densities and shapes, which are responsible for segregation during transport, storage and handling of powder compositions. This se...

Claims

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Application Information

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IPC IPC(8): B22F1/00
Inventor 张晖
Owner 张晖
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