Beryllium-free high-strength copper alloy powder suitable for laser additive manufacturing and preparation method of beryllium-free high-strength copper alloy powder

Abstract

The invention discloses beryllium-free high-strength copper alloy powder suitable for laser additive manufacturing and a preparation method of the beryllium-free high-strength copper alloy powder. The alloy powder comprises 20%-25% of Ni, 5%-8% of Sn, 1.5%-2.2% of Al, 0.5%-1.0% of Co, 0.2%-1.0% of Nb, 0.05%-0.15% of Ti, 0.5%-1.0% of V, 0.002%-0.006% of B and the balance Cu. Vacuum induction melting gas atomization preparation is adopted, the preparation process is designed and controlled, and finally, the alloy powder of 15-53 microns is prepared. The yield strength of copper alloy basically reaches the strength level of copper-beryllium alloy, the comprehensive performance of replacing the copper-beryllium alloy is met, and the beryllium-free copper alloy reduces damage to human health and pollution to the environment in the powder production and use process. According to the preparation method, the fine powder yield is high, and the prepared copper alloy powder has the characteristics of uniform chemical components, extremely low oxygen content, low hollow sphere rate, good fluidity and the like, and meets the performance requirements of the selective laser melting additive manufacturing technology on the copper alloy powder.

Description

technical field [0001] The invention belongs to the technical field of new metal materials for additive manufacturing, and more specifically relates to a beryllium-free high-strength copper alloy powder suitable for laser additive manufacturing and a preparation method thereof. Background technique [0002] Copper-beryllium alloy is a high-strength and high-conductivity copper-based alloy. Its yield strength can reach more than 960MPa, and its tensile strength can reach more than 1400MPa. It also has high hardness, wear resistance, corrosion resistance, low temperature resistance, fast heat dissipation, and non-magnetic properties. , high electrical conductivity, impact and no sparks and other comprehensive properties; widely used in aerospace bushings, bearing bushes, die-casting molds, mold inserts and other fields. But because metal beryllium (Be) is poisonous, and 1~2wt.% Be element is added in this kind of copper alloy, therefore can damage people's health during proces...

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Problems solved by technology

The nominal composition (wt.%) of an existing Cu-Ni-Sn-based amplitude modulation decomposition alloy is 9.5-10.5Ni, 7.5-8.5Sn, 1.0Zn, and the rest is Cu (C96800); its yield strength is 680-820MPa , while its tensile strength is limited within 930MPa

Another option as copper beryllium alloy is aluminum bronze, an existing aluminum bronze has a nominal composition (wt.%) of 18Al, 14Mn, 3Fe, 2Ni, and the rest is Cu (ZCuAl18Mn14Fe3Ni2), and its yield strength is lower than 420MPa

The nominal composition (wt.%) of an existing aluminum brass is 25Zn, 6Al, 3Fe, 3Mn, and the rest is Cu (ZCuAl6Fe3Mn3), and its yield strength is limited within 450MPa

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