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Wear-resistant elements and method of making same

a technology of wear-resistant elements and elements, applied in the direction of solid-state diffusion coating, coating, metallic material coating process, etc., can solve the problems of difficult to maintain desired oil-retaining properties, surface wear uniformity, and possibility of seizing, so as to promote nitriding treatment, high-reliable wear-resistant elements, and enhance hardness

Inactive Publication Date: 2008-09-11
FUKUHARA HIROYUKI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a method of making a wear-resistant element using iron-based alloy powder containing Cr and a nitriding treatment having no carburizing action. The method involves shaping and sintering the material into a compact, and conducting the nitriding treatment to cause a surface of the compact to have a mixed structure of an Fe—Cr—N compound layer, an Fe—Cr—N diffused layer, and a matrix. The compact can also have pores formed in the surface thereof, with the Fe—Cr—N compound layer being formed at locations adjacent the pores and the mixed structure of the Fe—Cr—N diffused layer and the matrix being formed at locations remote from the pores. The wear-resistant element made using this method has a high degree of wear resistance and can be used in various applications such as cutting tools, engine parts, and wear-resistant parts.

Problems solved by technology

Accordingly, if a wear-resistant element such as a vane for use in a compressor is made of one of such materials, the vane tends to wear uniformly during operation of the compressor.
As a result, the surface is hard to maintain desired oil retaining properties, and there is a possibility of seizing.

Method used

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  • Wear-resistant elements and method of making same
  • Wear-resistant elements and method of making same
  • Wear-resistant elements and method of making same

Examples

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example 1

[0064]Three kinds of iron-based alloy powder were formed into a predetermined shape, and each compact so shaped was vacuum-sintered at a predetermined temperature (for example, 1180° C.) to thereby form a sintered compact, which was in turn heat-treated in a predetermined fashion, and thereafter, the surface of each compact was inspected. The materials of the samples (sintered compacts) correspond to SKH51, and the samples are hereinafter referred to as samples X, Y and Z.

[0065]Table 1 indicates results of a component analysis of samples X, Y and Z after the heat treatment.

TABLE 1unit: wt %OthersMaterialWMoCrVSiC(Fe etc.)Sample X5.5~4.0~3.5~1.4~0.4~1.2~≦1.06.76.05.02.40.91.8Sample Y5.5~4.0~3.5~1.4~0.4~0.9~≦1.06.76.05.02.40.91.4Sample Z5.5~4.0~3.5~1.4~0.4~0.9~≦1.06.76.05.02.40.91.4

[0066]FIG. 5 depicts heat treatment patterns conducted to the materials of the samples. Table 2 indicates the material characteristics of the samples.

TABLE 2DensityHardnessTransverse RuptureMaterial(g / cm3)(...

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Abstract

A material is shaped and sintered into a compact using iron-based alloy powder containing Cr; and a nitriding treatment having no carburizing action is conducted to the compact so that a surface of the compact may have a mixed structure 3 of an Fe—Cr—N compound layer 2, an Fe—Cr—N diffused layer, and a matrix.

Description

TECHNICAL FIELD[0001]The present invention relates to wear-resistant elements having an increased hardness by nitriding and also to a method of making the same.BACKGROUND ART[0002]A vane mounted in, for example, rotary compressors is slidably received within a vane groove defined in a cylinder. Because the vane is held in sliding contact at its side surfaces with side walls of the vane groove and at its end portion with a roller, the vane must have wear resistance. For this purpose, a material having a base material for which steel, a sintered metal or cast iron containing chromium is used and which is soft-nitrided has been proposed. This material has a first compound layer or surface layer of Fe—Cr—N and a second compound layer of the same composition formed below the first compound layer (see Document 1).[0003]Another material has been proposed having a nitrided layer that is formed by nitriding the surface of a base material of stainless steel (see Document 2).[0004]A further ma...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C8/26B22F3/10B22F3/24C23C8/02
CPCB22F3/24C23C8/26C23C8/02B22F2003/241
Inventor FUKUHARA, HIROYUKISASAKI, KENJIHIRATA, KENSUKEHOMMA, TOSHIHIKO
Owner FUKUHARA HIROYUKI
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