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Build-up wear-resistant copper alloy and valve seat

一种耐磨铜、气门座的技术，应用在金属材料涂层工艺、机器/发动机、机械设备等方向，能够解决抗裂性变差、焊缝裂纹等问题，达到改善堆焊性的效果

Inactive Publication Date: 2006-07-19
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when it is intended to further improve wear resistance and increase the area ratio of hard particles, the crack resistance during surfacing becomes poor, and weld cracks often occur

Method used

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  • Build-up wear-resistant copper alloy and valve seat
  • Build-up wear-resistant copper alloy and valve seat
  • Build-up wear-resistant copper alloy and valve seat

Examples

Experimental program
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Effect test

Embodiment Construction

[0042] (1) In boron-containing alloys, when they come into contact with air in a molten state, they generate boron oxide (B 2 o 3 ). The B 2 o 3 Acts as a flux to improve the fluidity and weldability of wear-resistant copper alloys for overlay welding to the substrate.

[0043]The metal structure of the wear-resistant alloy for overlay welding according to the present invention is such that hard particles are distributed in a soft matrix. If only boron is added to the copper alloy, coarse, very hard and brittle borides of nickel, iron and molybdenum will be formed in the hard particles or matrix. Therefore, the hard particles become prone to cracking and lead to poor crack resistance during build-up welding. Furthermore, due to these coarse and very hard borides, although the amount of wear of the copper alloy itself is small, the mating parts are worn rougher and thus increase the so-called damage to the mating parts. On the contrary, by compositely adding chromium whic...

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PUM

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Abstract

A wear-resistant copper alloy for overlaying and a valve sheet, characterized in that it has a chemical composition, in wt %, that nickel: 5.0 to 24.5 %, iron: 3.0 to 20.0 %, silicon: 0.5 to 5.0 %, boron: 0.05 to 0.5 %, chromium: 0.3 to 5.0 %, one or more of molybdenum, tungsten and vanadium: 3.0 to 20.0 %, and the balance: Cu and inevitable impurities. The above wear-resistant copper alloy for overlaying and valve sheet exhibit excellent wear resistance, while securing good overlaying characteristics and good resistance to cracking.

Description

technical field [0001] The invention relates to a wear-resistant copper alloy for surfacing, in particular to a wear-resistant copper alloy for surfacing that can be used for valve seats (valve seats) of internal combustion engines and the like. Background technique [0002] Generally, as a wear-resistant copper alloy for overlay welding, a beryllium-copper alloy in which beryllium is added to copper or a precipitation-hardening type alloy such as a copper-nickel-silicon alloy called a Colson alloy in which hardened copper is dispersed in a copper-based matrix Oxide particles such as Al 2 o 3 、TiO 2 and ZrO 2 Dispersion-strengthened alloys are known. However, the hardness of precipitation-hardening alloys deteriorates sharply at the aging temperature (350-450°C) or higher. In addition, because the particle size of the precipitated particles is very small, only a few μm or less, even if the hardness is higher, the Frictional conditions with accompanying sliding can also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/06F01L3/02
CPCF01L2810/02F01L2101/00C22C32/0078F01L3/04F01L3/02C23C30/00C23C26/02C22C9/06C23C24/10F01L2301/00
Inventor 河崎稔小林孝雄大岛正中西和之
Owner TOYOTA JIDOSHA KK
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