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Raw or granulated powder for sintering, and their sintered compacts

A sintered body and powder technology, which is applied in the field of sintered body and sintered granulated powder, can solve the problems of unstable carburizing effective hardening depth, poor formability, and poor dimensional accuracy of sintered body.

Inactive Publication Date: 2005-06-01
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the diffusion rate is slow, so there is a problem that the so-called sinterability is reduced, and the sintered density cannot be increased, or there is a problem that the crystal grains tend to become large, and it is difficult to obtain a sintered body with stable characteristics.
[0010] In addition, if the influence of powder particle size is taken into account, when the average particle size of the powder is large, the sintered density will decrease and there will be many closed pores, so there is also the problem that the effective hardening depth of carburizing after sintering becomes unstable.
[0011] On the other hand, although its sinterability has become better and the sintered density has also been improved, there is a problem of so-called poor fluidity.
Therefore, in the extrusion molding method, there is a problem that the formability is poor, and it is difficult to fill uniformly when manufacturing products with complex shapes.
[0012] In addition, since the molding density becomes smaller, the dimensional accuracy of the sintered body is poor, and the particle size that can be used has a lower limit.
Therefore, the sintered density of the obtained sintered body also has a limit
[0013] In addition, in the sintered body with low sintered density, due to the poor strength and toughness, the deviation is still large, or the glossiness of the product surface is reduced, the appearance is also deteriorated, and the quality is reduced, so sintering There are also limitations in terms of the applicable range of raw material powder particle size

Method used

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  • Raw or granulated powder for sintering, and their sintered compacts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] (Embodiment 1) Raw material powder for sintering

[0023] The raw material powder for sintering in Embodiment 1 has Fe as a main component and contains 0.8% by weight or less of C, 0.05-1.0% by weight of Si, 1.0% by weight or less of Mn, and 1.0-10.0% by weight or less of Ni.

[0024] C is an element that can increase strength, and it is specified to be 0.8% by weight or less in view of reacting during sintering and removing oxygen and oxides in the powder as CO gas. When carrying out extrusion molding, it is advisable to make it as low as possible from the viewpoint of extrudability. On the other hand, if the content exceeds 0.8% by weight, the raw material powder for sintering will become hard, and its extrudability will deteriorate during extrusion molding. Furthermore, the above-mentioned amount of C powder (graphite powder, etc.) may also be mixed with the pre-alloyed powder that does not contain C or only partially contains C, and this embodiment is also included...

Embodiment approach 2

[0044] (Embodiment 2) Granulated powder for sintering

[0045] The granulated powder for sintering of this embodiment is formed by granulating the raw material powder for sintering described in Embodiment 1 using a binder.

[0046] The sintered granulated powder of this embodiment is preferably formed using a binder solution.

[0047] As the binder used for granulation, the same thing as described in Embodiment 1 can be used.

[0048] In addition, the solvent used in the binder solution may, for example, be solvents such as water or alcohols such as methanol and ethanol. In addition, these solvents may be used alone or in combination of two or more.

[0049] Granulated powder for extrusion molding and sintering can improve fluidity and formability, and achieve a high filling rate. From the viewpoint of obtaining a sintered body with good dimensional accuracy and material properties after sintering, it is preferable that the average particle size is 10-150 μm .

[0050] The...

Embodiment approach 3

[0051] (Embodiment 3) Manufacturing method of sintered body

[0052] The method for producing a sintered body according to this embodiment includes a first step of producing a raw material for sintering (the raw material powder for sintering in Embodiment 1 or the granulated powder for sintering in Embodiment 2), and sintering the raw material obtained in the first step. The second process of sintering is performed after molding from raw materials.

[0053] The production method of the raw material for sintering as the first step is as described above, so the description is omitted here. In addition, graphite powder can also be added as needed.

[0054] The second step preferably includes at least a step of sintering at a temperature of 1200-1400°C, preferably 1250-1380°C.

[0055] By sintering under the above temperature conditions, a product with high density and high mirror surface can be obtained. In the above-mentioned atmosphere, the pressure condition may be increase...

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Abstract

A raw material powder for sintering, which is a raw material powder for sintering with Fe as the main component, and contains 0.8% by weight or less of C, 0.05-1.0% by weight of Si, 1.0% by weight or less of Mn, and 1.0-10.0% by weight or less of Ni. The average particle size of the raw material powder is 8.5 μm or less. The present invention also relates to a granulated powder for sintering obtained by granulating the aforementioned raw material powder for sintering with a binder. According to the present invention, there can be provided a low-alloy steel powder for sintering capable of obtaining a sintered body having a high density and uniform properties, and a sintered body having such properties.

Description

technical field [0001] The present invention relates to a raw material powder for sintering, and more particularly to a raw material powder for sintering such as a low-alloy steel fine powder for sintering modified in order to obtain high sintering density and uniform characteristics, or a raw material powder for sintering obtained by granulating the raw material powder for sintering A granulated powder for sintering, and a sintered body obtained by using the raw material powder for sintering or the granulated powder for sintering. Background technique [0002] When manufacturing sintered parts, as properties required for sintered products, there are high density and dimensional accuracy, and various characteristics such as tensile strength, hardness, fatigue strength, impact strength, wear resistance, etc., and uniformity, but It is not easy to satisfy density, dimensional accuracy, and these characteristics at the same time. [0003] A premixing method and a prealloying m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/10C22C33/02C22C38/00C22C38/08C22C38/50
CPCB22F2998/00C22C33/0257C22C38/02C22C38/04C22C38/08C22C38/12B22F1/148A47J27/04A47J36/36A23L7/10A47J2027/043
Inventor 丰岛寿隆渡边笃
Owner SEIKO EPSON CORP
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