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Bronze alloy and sliding parts using the bronze alloy

A technology of bronze alloys and sliding parts, which is applied to rotating parts, shafts and bearings, bearing components, etc. which are resistant to centrifugal force, can solve the problems of not considering wear resistance and ablation resistance, so as to reduce manufacturing costs and industrial utilization. The effect of high value and excellent hardness

Active Publication Date: 2022-05-03
AKASHI GOHDOH
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  • Summary
  • 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 parts using the bronze alloy
  • Bronze alloy and sliding parts using the bronze alloy
  • Bronze alloy and sliding parts using the 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 present invention provides a lead-free bronze alloy and a sliding part with high ablation resistance and fixed wear resistance capable of withstanding variable high-speed, high-surface-pressure sliding. The bronze alloy of the present invention is characterized in that Sn contains 8 to 15 mass%, Bi contains 0.5 to 7.0 mass%, Ni contains 0.5 to 5.0 mass%, S contains 0.08 to 1.2 mass%, Fe contains 0.5 to 6.0 mass%, and the rest consists of Composed of Cu and unavoidable impurities; it has a eutectoid structure in which fine flake copper-tin intermetallic compounds are precipitated in α copper; iron-nickel intermetallic compounds and copper-iron-based complex sulfides 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 Patents(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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