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Bronze alloy, and sliding member using said bronze alloy

A bronze alloy, sliding part technology, applied in the direction of rotating parts, bearing components, shafts and bearings that resist centrifugal force, can solve problems such as wear resistance and ablation resistance without considering, and achieve excellent resistance to microcracks, Improved productivity and excellent hardness

Active Publication Date: 2020-09-04
AKASHI GOHDOH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the invention described in Patent Document 4 is aimed at lead-free copper alloys used as raw materials for faucet metal fittings, faucets, etc., and its examples are also centered around 3 to 4% of the Sn content. Discussion, did not consider wear resistance, ablation resistance, etc.

Method used

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  • Bronze alloy, and sliding member using said bronze alloy
  • Bronze alloy, and sliding member using said bronze alloy
  • Bronze alloy, and sliding member using said bronze alloy

Examples

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Embodiment

[0061] Next, specific examples of bronze alloys and sliding members according to the present invention are described based on experimental results.

[0062] Utilize the high-frequency smelting furnace to smelt the bronze alloy with the composition shown in Table 1, after casting the Shell sand mold of the JISA No. tensile test piece, machine it into JIS4 No. tensile test piece, and measure the tensile strength (MPa) of each test piece ), elongation at break (%), Brinell hardness (HB) and crystal grain size of the metal structure.

[0063] [Table 1]

[0064] No. Cu sn Ni Fe Bi S P Pb Zn mn 1 remaining ingredients 11.03 1.47 3.38 1.24 0.36 0.07 0.02 <0.005

Embodiment 5

[0066] In the metal structure of Example 5, Fe precipitates as a compound with Ni, and intermetallic compounds and double sulfides are uniformly dispersed in the metal structure in the form of fine particles. The primary crystal of α-copper becomes finer and becomes a comprehensive fine eutectoid structure. On the other hand, in Comparative Material 1, the primary crystal α-copper grew greatly, forming a heterogeneous metal structure with the eutectoid structure, and the precipitated compound (copper sulfide) was large and scattered randomly. It is clear that by adding Fe and Ni to the lead-free bronze of the present invention in substantially equal amounts, a surprising effect is obtained in terms of homogenization of the metal structure.

[0067] Tensile strength (MPa) and elongation at break (%) were measured in accordance with JIS Z2241, and Brinell hardness was measured in accordance with JIS Z2243, and are shown in Table 2. The determination of the crystal particle size...

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Abstract

The invention of the present application addresses the problem of providing: a bronze alloy which has a lead-free composition and is imparted with high seize resistance and adhesive wear resistance enough to withstand fluctuating high-speed / high-surface-pressure sliding; and a sliding member. The bronze alloy according to the invention of the present application is characterized by being a metal structure which contains 8 to 15% by mass of Sn, 0.5 to 5.0% by mass of Bi, 0.5 to 5.0% by mass of Ni, 0.08 to 1.2% by mass of S and 0.5 to 6.0% by mass of Fe, with the remainder made up by Cu and unavoidable impurities, and has such an eutectoid structure that a fine flake-like copper-tin-based intermetallic compound is precipitated in alpha-copper, wherein an iron-nickel-based intermetallic compound and a copper-iron-based mixed sulfide are dispersed in the metal structure.

Description

technical field [0001] The present invention relates to bronze alloy sliding parts used under high pressure and high speed, such as axial plunger type hydraulic pumps and motor cylinder blocks, and relates to bronze alloys with lead-free components and excellent ablation resistance and friction and wear properties, especially bronze alloys with A multilayered sliding member with a sliding surface obtained by fusion bonding the bronze alloy and an iron-based material, or a sliding surface in which only the bronze alloy is melted and plated by a method such as thermal spraying. Background technique [0002] Regarding hydraulic equipment, miniaturization, high pressure, and high speed are being promoted, and cylinder blocks, running parts, and transmission bearings of hydraulic pumps and motors are used under severe conditions. For example, in the field of axial piston hydraulic pumps and motors used in construction machinery such as excavators, the volume occupied by auxiliary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/02B22F7/04C23C4/06
CPCC22C9/02F16C2204/12F16C33/145F16C2223/42F16C33/121F16C33/122F16C2204/00F16C2202/04C22C1/0425B22F3/14
Inventor 舟木克之小泉彰护明石隆史
Owner AKASHI GOHDOH
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