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Mixed powder for iron-based powder metallurgy, method for producing same, sintered body produced using same, and method for producing sintered body

A technology of iron-based powder metallurgy and manufacturing method, applied in the field of iron-based powder metallurgy at the end of use, can solve the problems of sintered body pollution, reduced strength of mechanical parts, unstable quality, etc.

Active Publication Date: 2018-01-19
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of manganese sulfide powder has the following problems: it is not necessarily effective in recent high-speed cutting, sintered body contamination occurs, and mechanical strength decreases.
[0006] In the method disclosed in Patent Document 1, which contains calcium sulfide in the iron-based raw material powder, there are problems such as that the strength of mechanical parts is greatly reduced, and the quality (product quality) of the mixed powder changes over time, and the quality (product quality) is unstable.
In addition, when the sintered steel disclosed in Patent Document 1 is processed with a cutting tool, it is difficult for chips to be finely divided.
For this reason, it is difficult to say that the sintered steel disclosed in Patent Document 1 is excellent to the extent that it satisfies the current chip disposability requirements.

Method used

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  • Mixed powder for iron-based powder metallurgy, method for producing same, sintered body produced using same, and method for producing sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] First, commercially available calcium sulfide powder was classified at −63 / +45 μm (volume average particle size: 54 μm) with a sieve. The graded calcium sulfide powder is added into the airtight container according to the weight of the sintered CaS to reach 0.5% by weight. 0.75% by weight of an amide-based lubricant (product name: ACRAWAX C (manufactured by LONZA)) was added to this airtight container. Then, the mixture was mixed for 10 minutes while heating to 100° C., thereby covering the surface of the calcium sulfide powder with the amide-based lubricant.

[0083] Then, 2% by weight of copper powder (product name: CuATW-250 (manufactured by Fukuda Metal Foil Powder Industry Co., Ltd.)), 0.8 Graphite powder (product name CPB (manufactured by Nippon Graphite Industry Co., Ltd.)) by weight % and the calcium sulfide powder covered with the lubricant prepared above were used to prepare a mixed powder for iron-based powder metallurgy. In addition, the said graphite powd...

Embodiment 2

[0085] In Example 1, calcium sulfide powder and amide-based lubricant (product name: ACRAWAX C (manufactured by LONZA)) were added to an airtight container and heated to 100°C, while in Example 2, the The powders of all the components were put into an airtight container, heated to 100° C. by a hot melt method, and mixed for 30 minutes, thereby covering the surface of the powders of all the components with the amide-based lubricant. Then it was cooled to room temperature, thereby producing mixed powder for iron-based powder metallurgy.

Embodiment 3

[0087] In Example 3, the same powders as in Example 2 were mixed except that the amide-based lubricant used in Example 2 was replaced with a toluene solution containing styrene-butadiene rubber. The toluene solution was added so that the weight of the styrene-butadiene rubber after toluene volatilization became 0.1% by weight. Then, toluene was volatilized at 100° C., thereby covering the surface of the CaS raw material particles with styrene-butadiene rubber. Then, the amide-based lubricant used in Example 1 was added and mixed in an amount equivalent to that used in Example 1, to prepare the mixed powder for iron-based powder metallurgy of Example 3.

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Abstract

This mixed powder for iron-based powder metallurgy comprises a metal-based powder and a CaS raw material powder containing one or more substances selected from the group consisting of anhydrite III, anhydrite II, dihydrate calcium sulfate, calcium sulfide, and calcium sulfate hemihydrate. The CaS raw material powder is coated with a lubricant and / or a binder.

Description

technical field [0001] The present invention relates to mixed powder for iron-based powder metallurgy and its manufacturing method, as well as the sintered body made by using it and the manufacturing method of sintered body, especially relates to the vulcanized powder covered by either one or both of lubricant and binder. A mixed powder for iron-based powder metallurgy of calcium powder or calcium sulfate hemihydrate powder, a method for producing the same, a sintered body produced using the same, and a method for producing the sintered body. Background technique [0002] Powder metallurgy is widely used as an industrial production method for various mechanical components. In the step of iron-based powder metallurgy, first, mixed powder is prepared by mixing iron-based powder with alloy powder such as copper (Cu) powder and nickel (Ni) powder, graphite powder, and lubricant. Then, this mixed powder is filled in a mold, extruded, and sintered to produce a sintered body. Fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F1/02C22C33/02B22F1/10B22F1/102B22F1/12
CPCC22C1/05C22C33/0221B22F2998/10B22F1/10B22F1/12B22F1/102B22F3/02B22F3/10B22F9/04C22C33/02B22F2302/25
Inventor 赤城宣明
Owner KOBE STEEL LTD
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