Sintered leadless free-cutting brass and preparation method thereof

A technology that is easy to cut and brass is applied in the field of metal materials and its manufacturing, which can solve the problems of lead brass polluting the environment, and achieve the effects of stable product quality, reliable production process, and low production and processing costs

Active Publication Date: 2010-01-13
XIAMEN LAVIDA HI TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to effectively solve the problem of lead brass polluting the environment, and can pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Composition of sintered lead-free free-cutting brass powder (all mass fractions), copper (Cu) 53.5%, aluminum (Al) 0.4%, magnesium (Mg) 4.3%, manganese (Mn) 0.2%, cerium (Ce) 0.08 %, the rest is zinc (Zn) and impurities whose total amount is not more than 0.05%. When mixing powder, the mass fraction of BN powder is 0.4%, the mass fraction of binder zinc stearate is 1%, the sintering activator zinc powder is 3%, and the balance is brass powder. The planetary ball mill is used to mix the powder, the ball to material ratio is 10:1 (mass ratio), and 10% of the total mass of the powder is put into ball milling beads before ball milling. The ball milling time is 6 hours, and the powder is pressed immediately after mixing. The sintering process is as follows: heating from room temperature to sintering temperature for 5 hours in order to fully remove the binder. The sintering temperature is 840°C, and the sintering time is 5 hours. The sintering atmosphere is a hydrogen atmos...

Embodiment 2

[0020] Composition of sintered lead-free free-cutting brass powder (all mass fractions), copper (Cu) 53.5%, aluminum (Al) 0.4%, magnesium (Mg) 4.3%, manganese (Mn) 0.2%, cerium (Ce) 0.08 %, the rest is zinc (Zn) and impurities whose total amount is not more than 0.05%. When mixing powder, the mass fraction of BN powder is 1.0%, the mass fraction of binder zinc stearate is 1%, the sintering activator zinc powder is 3%, and the balance is brass powder. The planetary ball mill is used to mix the powder, the ball to material ratio is 10:1 (mass ratio), and 10% of the total mass of the powder is put into ball milling beads before ball milling. The ball milling time is 6 hours, and the powder is pressed immediately after mixing. The sintering process is as follows: heating from room temperature to sintering temperature for 5 hours in order to fully remove the binder. The sintering temperature is 840°C, and the sintering time is 5 hours. The sintering atmosphere is a hydrogen atmos...

Embodiment 3

[0022] Composition of sintered lead-free free-cutting brass powder (all mass fractions), copper (Cu) 53.5%, aluminum (Al) 0.4%, magnesium (Mg) 4.3%, manganese (Mn) 0.2%, cerium (Ce) 0.08 %, the rest is zinc (Zn) and impurities whose total amount is not more than 0.05%. When mixing powder, the mass fraction of BN powder is 1.6%, the mass fraction of binder zinc stearate is 1%, the sintering activator zinc powder is 3%, and the balance is brass powder. The planetary ball mill is used to mix the powder, the ball to material ratio is 10:1 (mass ratio), and 10% of the total mass of the powder is put into ball milling beads before ball milling. The ball milling time is 6 hours, and the powder is pressed immediately after mixing. The sintering process is as follows: heating from room temperature to sintering temperature for 5 hours in order to fully remove the binder. The sintering temperature is 840°C, and the sintering time is 5 hours. The sintering atmosphere is a hydrogen atmos...

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PUM

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Abstract

The invention relates a sintered leadless free-cutting brass and a preparation method thereof and the brass comprises the following elements by weight percent: 48.0%-70.0% of copper, 0.3%-0.4% of aluminum, 4.0%-4.3% of magnesium, 0.1%-0.2% of manganese, 0.08%-0.11% of cerium, 0.01%-0.03% of lanthanum, 0.4-2.4% of BN powder and the balance zinc and not more than 0.05% of impurities; various powders and binding agent are prepared according to the following proportioning by weight percent: 0.4-2.4% of BN powder, 2-4% of zinc powder used as sintering activator, 1% of zinc stearate used as binding agent and the balance brass powder. The preparation method comprises the following steps: using a planetary ball mill to mix powder, the weight ratio of ball to powder is 10:1, the mixing time is 6h, after mixing powders pressing is performed; then sintering is performed, the sintering technology is as follows: the temperature is heated from the room temperature to a sintering temperature, the heating time is 5h, the sintering temperature is 840 DEG C, the sintering time is 2h, the sintering atmosphere is hydrogen atmosphere and after sintering, the temperature is fast cooled to the room temperature. The alloy of the invention contains no lead in composition, is environmentally friendly and has simple production process and the powder metallurgy method is applicable to large-scale batch production and has low processing cost.

Description

technical field [0001] The invention relates to a metal material and its manufacturing technology, in particular to lead-free free-cutting brass and its manufacturing method. Background technique [0002] The solubility of lead in brass melt is very high, but the solid solubility in copper is almost zero, so when the lead brass melt solidifies, lead will precipitate to form dispersed and fine lead particles. Lead is brittle but not hard. On the other hand, the melting point of lead is only 327.5°C. When the lead brass is cut, the temperature rise will make the lead particles softer. When the lead brass is cut, these particles will disperse. The soft lead particle is equivalent to a cavity in the brass, which becomes a source of stress concentration and produces the so-called "notch effect", which causes chips to break easily here. In addition, the contact part between the cutter head and the chip is instantly melted due to the heat of the cutting process, which helps to cha...

Claims

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Application Information

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IPC IPC(8): C22C9/04C22C30/06C22C1/05
Inventor 许传凯胡振青黄劲松章四琪
Owner XIAMEN LAVIDA HI TECH MATERIAL CO LTD
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