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Lead-free free-cutting silicon magnesium phosphorus brass alloy and preparation method thereof

A silicon-magnesium-phosphorus brass and easy-cutting technology, which is applied in the field of lead-free easy-cutting silicon-magnesium-phosphorus brass alloy and its preparation, can solve the problems of difficult control of alloy quality, high material hardness, and large amount of addition, and achieve excellent Excellent casting performance and mechanical properties, excellent corrosion resistance, and excellent cutting performance

Active Publication Date: 2017-09-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the research process, there are still key problems to be solved. Adding a single or two main elements, if the amount is too much, on the one hand, it is easy to oxidize and burn during smelting, and it is difficult to control the quality of the alloy; on the other hand, it will make the material The hardness is too high; the addition amount is too small to form effective chip breaking particles, and the cutting performance is not ideal, so that it is difficult to popularize and apply

Method used

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  • Lead-free free-cutting silicon magnesium phosphorus brass alloy and preparation method thereof
  • Lead-free free-cutting silicon magnesium phosphorus brass alloy and preparation method thereof
  • Lead-free free-cutting silicon magnesium phosphorus brass alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Weigh Cu, Zn, Si, Mg, P, Al, and B according to the mass percentage of the lead-free free-cutting silicon-magnesium-phosphorus brass alloy, and Mg, P, Al, and B are all added in the form of master alloys , the mass percentages of the above components are as follows: Cu 60wt%, Si0.9wt%, Mg 0.5wt%, P 0.6wt%, Al 0.3wt%, 0.003wt% B, the rest are Zn and other impurities, the content of impurities is less than 1wt %;

[0050] (2) Melt the alloy in a graphite crucible, first melt Cu and Si, then cool down to 700°C and add Al, Zn, Mg, P, B sequentially, after all the metals are melted, the obtained alloy melt is kept at 1050°C for 20 Minutes to achieve homogenization of the alloy melt composition, slag removal, pouring into a mold preheated to 200°C at 1050°C, cooling to room temperature, and demoulding to obtain the lead-free free-cutting silicon-magnesium-phosphorus brass alloy.

[0051] The X-ray diffraction pattern of the lead-free free-cutting silicon-magnesium-phosp...

Embodiment 2

[0057] (1) Weigh Cu, Zn, Si, Mg, P, Al, B, Re according to the mass percentage of lead-free free-cutting silicon-magnesium-phosphorus brass alloy components, among which Mg, P, Al, B, and Re are all in the middle Added in the form of alloy, the mass percentage of the above components is as follows: Cu 60wt%, Si 0.7wt%, Mg 0.7wt%, P 0.7wt%, Al 0.3wt%, 0.003wt% B, 0.003wt% Re, the rest is Zn and other impurities, the content of which is less than 1wt%;

[0058] (2) Melt the alloy in a graphite crucible, first melt Cu and Si, then cool down to 700°C and add Al, Zn, Mg, P, B, Re in sequence, and after all the metals are melted, the obtained alloy melt is at 1050°C Keeping the temperature for 20 minutes to achieve homogenization of the alloy melt composition, slag breaking, pouring into a mold preheated to 200°C at 1050°C, cooling to room temperature, and demoulding to obtain the lead-free free-cutting silicon-magnesium-phosphorus Brass alloy.

[0059] The X-ray diffraction patte...

Embodiment 3

[0065] (1) Weigh Cu, Zn, Si, Mg, P, and Al respectively according to the mass percentage of lead-free free-cutting silicon-magnesium-phosphorus brass alloy, where Mg, P, and Al are all added in the form of master alloys, and the above components The mass percentages of Al are as follows: Cu 60wt%, Si 0.7wt%, Mg 0.6wt%, P 0.5wt%, Al 0.3wt%, the rest are Zn and other impurities, and the content of impurities is less than 1wt%;

[0066] (2) Melt the alloy in a graphite crucible, first melt Cu and Si, then cool down to 700°C and add Al, Zn, Mg, P sequentially, after all the metals are melted, the obtained alloy melt is kept at 1050°C for 20 minutes, After homogenizing the composition of the alloy melt, slag breaking is carried out, pouring into a mold preheated to 200°C at 1050°C, cooling to room temperature, and demoulding to obtain the lead-free free-cutting silicon-magnesium-phosphorus brass alloy.

[0067] The X-ray diffraction pattern of the lead-free free-cutting silicon-mag...

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Abstract

The invention discloses a lead-free free-cutting silicon magnesium phosphorus brass alloy and a preparation method thereof. The silicon magnesium phosphorus brass alloy comprises, by weight percentage, 60% of Cu, 0.5-0.9% of Si, 0.5-0.9% of Mg, 0.5-0.7% of P, 0.2-0.4% of Al, 0-0.6% of selectively-added elements, and the balance Zn and impurities, wherein the summation of the impurities is less than 1 wt%. According to the lead-free free-cutting silicon magnesium phosphorus brass alloy, the adding proportion of Mg, Si and P is required strictly, and the sum of the contents of the elements of Mg, Si and P is 1.8-2.4 wt%, wherein the sum of the contents of Mg and Si is 1.3-1.6 wt%. The preparation method comprises the following steps of melting components of raw materials, refining at the high temperature after homogenizing the components, pouring, cooling to indoor temperature for demoulding, and obtaining the lead-free free-cutting silicon magnesium phosphorus brass alloy. The lead-free free-cutting silicon magnesium phosphorus brass alloy is excellent in cutting property, corrosion resistance property and mechanical property, and low in cost, can replace lead brass, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of environment-friendly brass alloys, and in particular relates to a lead-free free-cutting silicon-magnesium-phosphorus brass alloy and a preparation method thereof. Background technique [0002] Lead brass has excellent cutting performance, comprehensive performance and price advantages, and has a wide range of applications in various fields such as plumbing and bathroom, electrical and electronic, instrumentation, and machinery manufacturing. However, lead element will be precipitated during processing or use, which will endanger human health. As people's awareness of health and environmental protection continues to increase, developed countries have long restricted and banned lead brass, and my country has also stepped up the research and application of lead-free brass. The copper content of high-copper-silicon brass is as high as 70% or more. Although the comprehensive performance is good, the cost is too high a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04C22C1/03
CPCC22C1/03C22C9/04
Inventor 朱权利田小平杨超
Owner SOUTH CHINA UNIV OF TECH
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