Iron base sintered alloy exhibiting high surface densification and high surface hardness, and method for production thereof

An iron-based sintering, surface hardness technology, applied in chemical instruments and methods, metal processing equipment, metal layered products, etc., can solve the problems of incomplete formation, insufficient tightness of the inner surface of the cavity, and difficulty in forming a lubricant film.

Inactive Publication Date: 2006-08-02
MITSUBISHI MATERIALS PMG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, a higher fatty acid-based lubricant in which metal salts of higher fatty acids such as zinc stearate, calcium stearate, and lithium stearate in a solid state such as existing solid powders are suspended in water is coated on the surface of the forming mold. The lubricant film obtained on the inner surface of the cavity is formed as a solid powder film on the inner surface of the cavity, and a dense film is not formed on the inner surface of the cavity of the molding mold, and the tightness to the inner surface of the cavity is not sufficient. Disadvantages, so there is a problem that it is difficult to form a stable lubricant film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0108] A cavity having a diameter of 11 mm and a height of 40 mm was prepared, and a forming mold capable of heating the inner surface of the cavity to a predetermined temperature was prepared. Furthermore, as raw material powders, Fe-1.5% Mo iron-based alloy powder with an average particle size of 90 μm and C powder with an average particle size of 20 μm were prepared, and were prepared and mixed with a V-type mixer to form Fe-1.5% Mo-0.3% C, Instead, a mixed powder was produced.

[0109] Furthermore, potassium sulfate, potassium sulfite, potassium thiosulfate, potassium dodecylsulfate, potassium dodecylbenzenesulfate, edible cyanine No. 1, and potassium ascorbyl sulfate were prepared as potassium sulfate salts. Sodium sulfate salt, sodium sulfate, sodium sulfite, sodium thiosulfate, sodium lauryl sulfate, sodium dodecylbenzene sulfate, edible yellow pigment No. 5, and sodium ascorbyl sulfate were prepared.

[0110] Lubricants A to U and a to f shown in Table 1-1 were produced...

Embodiment 1-1

[0113] After keeping the temperature of the inner surface of the cavity of the forming mold at 150°C in advance, apply the lubricants A~G and a~b shown in Table 1-1 to the inner surface of the cavity with different thicknesses, and evaporate the water, On the inner surface of the cavity, a layer of different thicknesses composed of potassium sulfate, potassium sulfite, potassium thiosulfate, potassium dodecylsulfate, potassium dodecylbenzenesulfate, edible cyanine No. 1 and potassium ascorbyl sulfate is formed. crystalline layer.

[0114] On the other hand, in the cavity of the forming mold forming these crystalline layers, the raw material powder Fe-1.5% Mo iron-based alloy powder and C powder are filled, mixed with a V-shaped mixer, and prepared as Fe-1.5% Mo -0.3% C, and after obtaining the mixed powder, it was press-molded at 800 MPa to produce a green compact having a high-concentration layer of K on the surface. The thus-obtained compacted powder having a high-concentra...

Embodiment 1-2

[0122] After keeping the temperature of the inner surface of the cavity of the forming mold at 150°C in advance, apply the lubricants H~N and c~d shown in Table 1-1 to the inner surface of the cavity with different thicknesses, and evaporate the water, Crystalline layers with different thicknesses are formed on the inner surface of the cavity and are composed of disodium bisulfate, trisodium sulfate, polysodium sulfate and riboflavin sodium sulfate.

[0123] On the other hand, in the cavity of the molding mold forming these crystal layers, the raw material powder Fe-1.5%Mo iron-based alloy powder and C powder are filled, mixed by a V-shaped mixer, and prepared as Fe-1.5%Mo -0.3% C, and the obtained mixed powder was press-molded at 800 MPa to produce a green compact having a high-concentration layer of Na on the surface. The thus-obtained pressed powder body having a high-concentration layer of Na on the surface was heated in 5% H 2 -N 2 In a gas atmosphere, sintering was car...

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Abstract

An iron base sintered alloy having highly densified and hardened surface and a producing method thereof are provided. The iron base sintered alloy includes an iron base sintered alloy surface layer portion having a thickness in a range of 1 µm to 2 mm from a surface of the iron base sintered alloy and containing K and / or Na in an average concentration of 0.0001 to 1 mass%, or having an average concentration of P higher than a concentration of P in an iron base sintered alloy inner portion located inside the iron base sintered alloy surface layer portion and containing K and / or Na in an average concentration of 0.0001 to 1 mass%.

Description

technical field [0001] The present invention relates to an iron-based sintered alloy, comprising an iron-based sintered alloy surface layer part (hereinafter referred to as an iron-based sintered alloy surface layer part) consisting of a thickness within the range of 1 μm to 2 mm from the alloy surface, and The interior of the iron-based sintered alloy (hereinafter referred to as the interior of the iron-based sintered alloy) on the inner side of the alloy surface layer is related to the surface compactness and Iron-based sintered alloy with high surface hardness and its production method, the iron-based sintered alloy can be used effectively as mechanical parts requiring surface hardness and wear resistance, for example, sprockets, gears, rotors, inner rings, outer rings, etc. Members such as rings, and the iron-based sintered alloy of the present invention has a high surface density, so it can be effectively used as a member such as a mechanical part composed of an iron-base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/58C22C33/02B22F3/02B22F3/035B22F1/17B22F7/00
CPCC22C38/00C23C24/06B22F3/02C22C33/0264C22C1/08C22C38/12B32B15/011B22F1/025B22F7/00C22C33/0228C23C24/082B22F3/11B22F2003/023B22F2998/00B22F7/004B22F1/17B22F5/08C22C33/02
Inventor 川濑欣也中井崇
Owner MITSUBISHI MATERIALS PMG CORP
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