Method for preparing unleaded free-cutting brass

A technology that is easy to cut and brass is applied in the field of metal material manufacturing, which can solve the problems of lead brass polluting the environment and achieve excellent cutting performance

Active Publication Date: 2012-05-30
HUNAN TERRY NEW MATERIALS COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to effectively solve the problem of lead-brass polluting the environment, provide a low-cost preparation method of lead-free free-cutting bra...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017]The mass fraction of each element in the brass powder is: copper (Cu) 54.0%, the rest is zinc (Zn), the total amount of impurities is not more than 0.5%, and the content of any impurity is not more than 0.05%. The second phase fine powder is graphite fine powder with a particle size of 10 μm, the particle size of the brass powder is ≤106 μm, and the particle size of the phosphorus-containing copper powder is ≤75 μm. The proportion of various powders is as follows: the mass fraction of sintering activator phosphorus-containing copper powder is 0.5%, the mass fraction of phosphorus contained in phosphorus-containing copper powder is 1.8%; the mass fraction of graphite fine powder is 0.06%; the binder stearic acid The mass fraction of zinc is 0.5%; the mass fraction of dispersant is 0.3%; the balance is brass powder. The powder is mixed using a V-shaped mixer (without balls), and the mixing time is 6 hours. After the mixing is completed, it is pressed. After pressing, it is...

Embodiment 2

[0019] The mass fractions of each element in the brass powder are: copper (Cu) 54.0%, nickel (Ni) 0.1%, tin (Sn) 0.17%, the rest is zinc (Zn), the total amount of impurities is not more than 0.5%, any one The impurity content is not more than 0.05%. The second phase fine powder is hexagonal boron nitride fine powder with a particle size of 5 μm, the particle size of the brass powder is ≤106 μm, and the particle size of the phosphorus-containing copper powder is ≤75 μm. The proportion of various powders is as follows: the mass fraction of phosphorus-containing copper powder for sintering activator is 0.5%, the mass fraction of phosphorus contained in phosphorus-containing copper powder is 1.8%; the mass fraction of hexagonal boron nitride micropowder is 0.11%; binder The mass fraction of zinc stearate is 0.7%; the mass fraction of dispersant is 0.37%; the balance is brass powder. The powder is mixed using a V-shaped mixer (without balls), and the mixing time is 6 hours. After ...

Embodiment 3

[0021] The mass fractions of each element in brass powder are: copper (Cu) 54.0%, nickel (Ni) 0.2%, manganese (Mn) 0.3%, magnesium (Mg) 0.1%, silicon (Si) 1.0%, and the rest is zinc (Zn), the total amount of impurities is not more than 0.5%, and the content of any impurity is not more than 0.05%. The second phase fine powder is a mixed powder of manganese sulfide fine powder and graphite fine powder, the particle size is 2.3 μm, the particle size of brass powder is ≤106 μm, and the particle size of phosphorus-containing copper powder is ≤75 μm. The proportion of various powders is as follows: the mass fraction of phosphorus-containing copper powder in sintering activator is 0.5%, the mass fraction of phosphorus contained in phosphorus-containing copper powder is 1.8%; the mass fraction of mixed powder of manganese sulfide and graphite micro-powder is 0.22% ; The mass fraction of the binder zinc stearate is 0.9%; the mass fraction of the dispersant is 0.44%; the balance is bras...

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Abstract

A method for preparing unleaded free-cutting brass is used for production by means of a powder activation sintering process. Powder and binder include, in mass fraction ratio, sintering activator which contains from 0.2% to 0.5% of phosphorous copper powder and from 0.06% to 0.40% of second-phase micropowder, binder which contains from 0.5% to 1.0% of zinc stearate, from 0.3% to 0.5% of dispersant PVA (polyvinyl alcohol), and the rest percentage of brass powder. Sintering is performed after mixing and pressing, and the sintering process includes that heating is performed from the room temperature to the sintering temperature ranging from 830 DEG C to 850 DEG C in a reducing atmosphere, wherein the heating time ranges from 2 hours to 5 hours, and the sintering time ranges from 45 minutes to 75 minutes. The second-phase micropowder is graphite micropowder, hexagonal boron nitride micropowder, manganese sulfide micropowder or molybdenum disulfide micropowder, the granularity of the second-phase micropowder ranges from 1 micrometer to 10 micrometers, the granularity of the brass powder is not larger than 106 micrometers, and the granularity of the phosphorous copper powder is not larger than 75 micrometers. The brass prepared by the method does not contain lead, bismuth and antimony, and the method is environment-friendly, suitable for mass production and low in production cost.

Description

technical field [0001] The invention relates to a metal material manufacturing technology, especially a manufacturing method of lead-free free-cutting brass. Background technique [0002] Lead brass has excellent cold and hot processing performance, excellent cutting performance and self-lubricating characteristics, and can meet the machining requirements of various shapes of parts. Leaded brass was once recognized as an important basic material in the world and widely used in civil water supply systems, electronics, automobile and machinery manufacturing and other fields. Because lead brass is widely used, there are a lot of discarded lead brass parts, of which only a small amount is recycled, and many small parts are discarded as garbage. Discarded lead brass is in contact with the soil, and the lead contained in it enters the soil under the long-term action of rainwater and the atmosphere, thereby polluting the soil and water sources. When waste lead brass is incinerate...

Claims

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Application Information

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IPC IPC(8): C22C9/04C22C1/05
Inventor 黄劲松金志红黄韶松
Owner HUNAN TERRY NEW MATERIALS COMPANY
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