A kind of lead-free free-cutting brass containing metal hydride and preparation method thereof

Abstract

The invention discloses metal hydride containing lead-free brass easy to cut and a preparing method of the metal hydride containing lead-free brass easy to cut. The metal hydride containing lead-freebrass is characterized by comprising 1-15 wt% of metal hydride. The preparing method comprises the following steps that under a certain hydrogen condition, an alloy element, capable of being hydrogenated, in an alloy absorbs hydrogen, the metal hydride is generated, finally, the metal hydride containing lead-free brass easy to cut is obtained, the raw material brass alloy at least comprises one alloy element capable of being hydrogenated, and it is required that a uniform alloy or solid solution can be formed by the alloy element capable of being hydrogenated and a matrix alloy element. The provided preparing method of the metal hydride containing lead-free brass easy to cut can be used for large-scale production, the obtained metal hydride containing lead-free brass easy to cut is applicable to the metal machining field, and particularly, the brass cutting machining performance is improved; and according to the method, the technology is simple, storage of needed raw materials is rich,the obtained metal hydride containing lead-free brass easy to cut is free of pollution, and the environment protection requirement is met.

Description

technical field [0001] The invention belongs to the technical field of material preparation. It relates to a brass alloy and a preparation method thereof. Background technique [0002] Although brass (Cu-Zn alloy) has excellent electrical and thermal conductivity and antibacterial properties, its extremely poor cutting performance limits its application range. At present, there are two commonly used measures to improve the machinability of materials: one is to adjust the chemical composition of materials; the other is to change the metallographic structure and physical properties of materials through heat treatment. In mass production, the cutting performance is generally improved by adjusting the chemical composition of the material. Lead brass (Cu-Zn-Pb alloy) is widely used in plumbing equipment, toys, clocks and other industries because it overcomes the shortcomings of brass's extremely poor cutting performance. However, the inherent water-soluble lead leaching of lea...

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Problems solved by technology

Among the lead-like elements, bismuth brass was the first to be studied. The mechanism of bismuth improving the cutting performance of brass is similar to that of lead. It has very little solid solubility in the brass matrix and is distributed on the brass matrix in a dispersed state. The chip breaking effect produced by the distributed elemental brittle particles improves the machinability of brass, but the grain boundary embrittlement caused by bismuth and other lead-like elements will damage the mechanical properties of the alloy, and the scarcity of resources of bismuth and other lead-like elements also limits this. A wide range of applications of alloys; magnesium and copper form intermetallic compounds with high melting point, high hardness and high brittleness. These intermetallic compounds can break chips and reduce welding during cutting. It is easy to corrode, which leads to poor corrosion resistance of the alloy; because graphite is brittle and soft, it is considered to replace lead as an alloying element to improve the cutting performance of brass, but graphite has poor wettability and low density, and is easy to Floating, it is difficult to generate graphite particles uniformly distributed like lead particles on the brass substrate

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