WO2014166018A1

WO2014166018A1 - Copper-based alloy pipe containing silicon and aluminum, and preparation method therefor

Info

Publication number: WO2014166018A1
Application number: PCT/CN2013/000791
Authority: WO
Inventors: 孙飞; 赵勇
Original assignee: 苏州金仓合金新材料有限公司
Priority date: 2013-04-10
Filing date: 2013-06-28
Publication date: 2014-10-16
Also published as: CN103194645A

Abstract

A copper-based alloy pipe containing silicon and aluminum, and a preparation method therefor. The copper-based alloy pipe containing silicon and aluminum comprises the following ingredients by mass percent: 72 to 76% of copper, 0.05 to 0.5% of silicon, 1 to 1.8% of aluminum, and a remainder zinc. On the basis of maintaining or not obviously reducing the cutability, wear resistance and antifriction properties, the copper-based alloy pipe ends addition of lead and inhibits dissolution of lead by adding silicon and aluminum elements, thereby effectively reducing the pollution.

Description

TECHNICAL FIELD The present invention relates to the field of non-ferrous metal processing technology, and in particular to a copper-based alloy tube containing silicon and aluminum and a preparation method thereof. Background, book

The reason why lead-containing copper alloy has good cutting performance and anti-friction and wear resistance is mainly due to the fact that lead exists in a single item in copper alloy and can play a good chip breaking effect during cutting. In the friction and wear environment, since the shear strength of lead is very low, the lead on the surface of the copper alloy part makes the friction coefficient of the lead-containing copper alloy relatively low. Therefore, lead is more commonly used in brass alloys.

However, when lead is heated to 400-500 ° C, lead vapor will escape and lead fumes will be formed. In the process of making lead powder and plates with lead ingots, lead dust will be emitted, polluting the air, and lead in the air. When the smoke reaches a certain concentration, it is harmful to the human body. SUMMARY OF THE INVENTION The object of the present invention is to provide a copper-based alloy tube containing silicon and aluminum, which maintains or does not significantly reduce the machinability and wear resistance of the original lead-containing tin bronze, in view of the above-mentioned deficiencies of the prior art. On the basis of friction reduction, the amount of lead added is eliminated and lead dissolution is suppressed by adding silicon and aluminum.

In order to achieve the above object, the technical solution adopted by the present invention is as follows.

A copper-based alloy tube containing silicon and aluminum, the mass percentage composition of which is: copper 72-76%; silicon 0.05-0.5%; aluminum 1-1.8%; balance is zinc. Preferably, the copper-based and aluminum-containing copper-based alloy tube provided by the present invention has a mass percentage composition of: copper 72%; silicon 0.5%; aluminum 1%; and the balance being zinc.

Preferably, the copper-based and aluminum-containing copper-based alloy tubes provided by the present invention have a mass percentage composition of: Copper 76%; silicon 0.05%; aluminum 1.8%; balance is zinc. Preferably, the copper-based and aluminum-containing copper-based alloy tube provided by the present invention has a mass percentage composition of: copper 74%; silicon 0.275%; aluminum 1.4%; and the balance being zinc. The invention further provides a method for preparing a copper-based alloy tube containing the above silicon and aluminum, comprising the steps of:

1) The electrolytic copper, silicon, aluminum and zinc are placed in a power frequency electric furnace according to the ratio, heated to 1200-1250 degrees, and completely heated to 1150 degrees after melting;

2) After thoroughly stirring the completely molten alloy liquid with a graphite rod, it is covered with high-purity flaky graphite powder to prevent oxidation thereof, and the thickness is 10-15 cm _;

3) After 1-1.5 hours of heat preservation, the sample taken from the power frequency electric furnace is subjected to 3-6 component inspections using a German-made Spike direct reading spectrometer to determine that the alloy composition is within the specified range;

4) After further heat preservation for 50-60 minutes, the temperature is raised again to 1200 degrees, and the vibration device of the power frequency electric furnace is turned on, and the hollow blank alloy pipe having an outer diameter of 120 mm, an inner diameter of 60 mm and a length of 550 mm is cast by a horizontal continuous casting method;

5) Annealing the copper tube with a box annealing furnace, the annealing temperature is 200-300 degrees, and the annealing time is 1.5-2 hours, so that the hardness of the copper tube is reduced to 60-70HB;

6) Surface processing of the annealed blank copper tube by an optical spindle machine, processing into an alloy tube with a smooth surface, a diameter of 115 mm, an inner diameter of 65 mm and a length of 550 mm, extruded by a 1000-ton single-action extruder, alloy ingot The heating temperature is 300-350 degrees, the extrusion temperature is 500 degrees, and the extrusion speed is V=15mm/s. After multiple extrusions, the outer diameter of the alloy tube is 100mm, the tolerance is +/_lmm, and the inner diameter is 80mm;

7) Annealing the extruded copper tube with a box annealing furnace, the annealing temperature is 100-200 degrees, and the annealing time is 1.5-2 hours;

8) The copper tube extruded and annealed is tested for a flaw detection ratio of 100%, and the flawed product is cut into a finished product having a length of 300 mm for packaging.

Further, the spectrometer in the step 3) is a Spike direct reading spectrometer.

Further, the number of component inspections in the step 3) is 3-6 times. The invention has the beneficial effects that the silicon-based and aluminum-containing copper-based alloy tubes of the invention can prevent the lead addition amount and pass the basis of maintaining or not significantly reducing the machinability and wear-resisting friction of the original lead-containing tin bronze. The addition of silicon and aluminum elements inhibits lead dissolution, effectively reducing pollution. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of a method for preparing a copper-based alloy tube using silicon and aluminum according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

(1) Example 1

A copper-based alloy tube containing silicon and aluminum, the mass percentage composition of which is: copper 72%; silicon 0.5%; aluminum 1%; balance is zinc.

The preparation method of the copper-based alloy tube of Embodiment 1, as shown in FIG. 1, includes the following steps:

6) Surface-processing the annealed blank copper tube with an optical spindle machine, and the surface is smooth and smooth. The alloy tube with a diameter of 115mm, an inner diameter of 65mm and a length of 550mm is extruded by a 1000-ton single-action extruder. The alloy ingot is heated at a temperature of 300-350 degrees, the extrusion temperature is 500 degrees, and the extrusion speed is V=15 mm/ s, after repeated extrusion, the outer diameter of the alloy tube is 100mm, the tolerance is +/_lmm, and the inner diameter is 80mm;

(2) Example 2

A copper-based alloy tube containing silicon and aluminum, the mass percentage composition of which is: copper 76%; silicon 0.05%; aluminum 1.8%; balance is zinc.

The preparation method of the silicon-based and aluminum-containing copper-based alloy tube of Example 2 was similar to that of Example 1, except that the ratio of the raw materials was proportional.

(3) Example 3

The preparation method of the silicon-based and aluminum-containing copper-based alloy tube of Example 3 was similar to that of Example 1, except that the ratio of the raw materials was proportional.

The performance of the new lead-free copper alloy material for soldering and the conventional solder material provided by the present invention are shown in Table 1.

Table 1 Comparison of performance between copper-based alloy tubes containing silicon and aluminum and lead-containing tin bronze tubes

Example 3 70 0.15 91 Existing contains

Lead alloy tube 60 0.17 80

HPb59-l

The copper-based alloy tube containing silicon and aluminum of the invention is based on maintaining or not significantly reducing the machinability and wear-resisting friction of the original lead-containing tin bronze, preventing the addition of lead and suppressing lead by adding silicon and aluminum elements. Dissolution, control lead dissolution amount below 0.01mg / L. The present invention provides that the silicon and aluminum elements added to the copper-based alloy form a dispersed dispersed single phase in the copper alloy, and these phases act as chip breaking during cutting, thereby improving the cutting performance of the brass. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; the invention is modified or equivalently substituted without departing from the spirit and scope of the invention. Within the scope of protection.

Claims

Claim

A copper-based alloy tube containing silicon and aluminum, characterized in that the mass percentage composition thereof is: copper 72-76%; silicon 0.05-0.5%; aluminum 1-1.8%; balance is zinc.

The copper-based and aluminum-containing copper-based alloy tube according to claim 1, wherein the mass percentage composition is: copper 72%; silicon 0.5%; aluminum 1%; and the balance being zinc.

The copper-based and aluminum-containing copper-based alloy tube according to claim 1, wherein the mass percentage composition is: copper 76%; silicon 0.05%; aluminum 1.8%; and the balance being zinc.

The copper-based and aluminum-containing copper-based alloy tube according to claim 1, wherein the mass percentage composition is: copper 74%; silicon 0.275%; aluminum 1.4%; balance is zinc.

A method of producing a copper-and-aluminum-containing copper-based alloy tube according to any one of claims 1 to 4, characterized in that it comprises the steps of:

3) After 1-1.5 hours of heat preservation, the sample taken from the power frequency electric furnace is subjected to component inspection by a spectrometer to determine that the alloy composition is within the specified range;

6) Surface processing of the annealed blank copper tube by an optical spindle machine, processing into an alloy tube with a smooth surface, a diameter of 115 mm, an inner diameter of 65 mm and a length of 550 mm, extruded by a 1000-ton single-action extruder, alloy ingot The heating temperature is 300-350 degrees, the extrusion temperature is 500 degrees, and the extrusion speed is V=15mm/s. After multiple extrusions, the outer diameter of the alloy tube is 100mm, and the tolerance is +/_lmm, inner diameter is 80mm;

The method for preparing a copper-based and aluminum-containing copper-based alloy tube according to claim 5, wherein the spectrometer in the step 3) is a Spike direct reading spectrometer.

The method for preparing a copper-based and aluminum-containing copper-based alloy tube according to claim 5, wherein the number of components in the step 3) is 3-6 times.