Bismuth-based overlay layer for sliding members

JP7873648B2Active Publication Date: 2026-06-12DAIDO METAL IND CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
DAIDO METAL IND CO LTD
Filing Date
2023-05-31
Publication Date
2026-06-12

AI Technical Summary

🎯Benefits of technology

【0015】 上記において、添加粒子の表面の濡れ性を制御するには、当該表面へプラズマ処理やUV照射処理など、任意の処理方法を選択できる。 添加粒子の表面の濡れ性を制御してこれを高めることで、めっき液中において、添加粒子同士が凝集することが防止される。これにより、添加粒子の分散性が高まる。 めっき液中の添加粒子量はめっき液1L当たり15g~150gとすることが好ましい。更に好ましくは40g~120g/1Lである。これにより、ビスマス基オーバレイ層のマトリックスを構成する、ビスマス若しくはビスマス合金においてGOSが1度以下の結晶粒子を全結晶粒子の85%以上とすることが容易に達成できる。めっき液を充分に撹拌することが要求されるが、その撹拌条件をシビアに制御する必要は無かった。

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Patent Text Reader

Abstract

To provide a bismuth-based overlay layer having high fatigue resistance even when additive particles are included.SOLUTION: A bismuth-based overlay layer for a sliding member comprises a polycrystalline matrix containing crystal particles composed of a material containing bismuth or a bismuth alloy, and additive particles dispersed in the matrix. The matrix includes a region where crystal particles having a Grain Orientation Spread (GOS) of 1 degree or less account for 85% or more of all crystal particles.SELECTED DRAWING: Figure 1
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Claims

[Claim 1] A bismuth-based overlay layer for a sliding member, A polycrystalline matrix containing crystalline particles made of a material containing bismuth or a bismuth alloy, and additive particles dispersed in the matrix, The matrix is ​​a bismuth group overlay layer in which, in a region of the overlay layer arbitrarily set to contain 1,000 or more of the crystal grains, 85% or more of the crystal grains have a GOS (Grain Orientation Spread) of 1 degree or less. [Claim 2] The bismuth group overlay layer according to claim 1, wherein the content of the added particles in the matrix is ​​1.0 vol to 15.0 vol%. [Claim 3] The bismuth group overlay layer according to claim 1, wherein the hardness is 20 HV or higher. [Claim 4] A sliding member comprising a bismuth group overlay layer according to any one of claims 1 to 3. [Claim 5] A step of treating the surface of the added particles to control the wettability of the surface, The steps include adding the processed additive particles to a plating solution for bismuth or a bismuth alloy and stirring, The steps include preparing the base of the sliding member, A lamination step involves laminating a bismuth group overlay layer onto the surface of the substrate of the sliding member using a plating solution containing the aforementioned additive particles. A method for manufacturing a sliding member comprising the above. [Claim 6] The manufacturing method according to claim 5, wherein the amount of the additive particles added to the plating solution is 15 g to 150 g per liter of the plating solution. [Claim 7] The manufacturing method according to claim 5, wherein the surface of the additive particles is subjected to plasma treatment or UV irradiation treatment to improve the wettability of the surface to the plating solution.