WO2019029024A1

WO2019029024A1 - Continuously cast alloy material for bearing bush and preparation method thereof

Info

Publication number: WO2019029024A1
Application number: PCT/CN2017/108226
Authority: WO
Inventors: 孙飞; 赵勇; 埃塞尔赛; 佐罗叶斯夫丹尼斯
Original assignee: 苏州列治埃盟新材料技术转移有限公司
Priority date: 2017-08-07
Filing date: 2017-10-30
Publication date: 2019-02-14
Also published as: CN107460364A

Abstract

A continuously cast alloy material for a bearing bush and a preparation method thereof. The alloy material is prepared from the following components: 1.5-3.5 wt% of zinc, 3.5-7.5 wt% of tin, 0.3-1.0 wt% of bismuth, 0.15-0.5 w% of silicon carbide, 0.1-0.5 wt% of aluminum oxide, and the balance of copper. The preparation method thereof comprises the steps of smelting, stirring, inspecting and the like in batches. The alloy material does not contain lead, such that the cutting performance and hardness of the alloy are improved while the requirement for environmental friendliness is met without increasing the cost, and therefore the alloy material is suitable for wear-resistant parts used at high temperature (400 C).

Description

Continuous casting alloy material for bearing bush and preparation method thereof

Technical field

The invention relates to an alloy material and a preparation method thereof, in particular to a continuous casting alloy material for a bearing bush and a preparation method thereof.

Background technique

Copper alloys are alloys based on copper and added to other elements. Existing tin bronze materials tend to add lead in order to achieve their easy chipping performance. With the obvious improvement of environmental awareness, the bronze alloy containing lead can no longer meet the requirements of high-end markets at home and abroad.

Therefore, there is a need for an alloy material that does not require the addition of lead and good machinability and a method for its preparation.

Summary of the invention

The object of the present invention is to provide a continuous casting alloy material for a bearing bush which is excellent in cutting performance and contains no lead element and a preparation method thereof by improving the alloy material composition and the mass ratio between the components.

In order to achieve the above object, the technical solution provided by the present invention is:

A continuous casting alloy material for a bearing bush composed of the following components by weight: 1.5-3.5 wt% of zinc, 3.5-7.5 wt% of tin, 0.3-1.0 wt% of bismuth, 0.15-0.5 wt% of silicon carbide, oxidation Aluminum 0.1-0.5wt%, copper balance.

Further, the continuous casting alloy material for the bearing pad is composed of the following components by weight: zinc 2 wt%, tin 5 wt%, niobium 0.7 wt%, silicon carbide 0.3 wt%, alumina 0.2 wt%, copper balance.

Further, the continuous casting alloy material for the bearing pad is composed of the following components by weight: zinc 1.5 wt%, tin 7.5 wt%, 铋 0.3 wt%, silicon carbide 0.5 wt%, alumina 0.3 Wt%, copper balance.

Further, the continuous casting alloy material for the bearing bush is composed of the following components by weight: zinc 3.5 wt%, tin 3.5 wt%, niobium 0.5 wt%, silicon carbide 0.15 wt%, alumina 0.4 wt%, copper the amount.

Further, hydrazine is a high purity hydrazine having a purity greater than 99.99%.

Further, the silicon carbide is silicon carbide particles having a particle diameter of more than 5 μm and less than 50 μm.

Further, the alumina is alumina particles having a particle diameter of more than 50 μm and less than 100 μm.

A method for preparing a continuous casting alloy material for a bearing bush has the following steps:

Step 1: under normal conditions, the electrolytic copper, tin, zinc are placed in a power frequency electric furnace according to the weight percentage, heated to 1180 ° C completely melted and then kept to 1000 ° C;

Step 2: After thoroughly stirring the alloy liquid obtained in the step 1 with a graphite tool, it is covered with a high-purity flaky graphite powder having a thickness of 6-10 cm to prevent oxidation thereof, and is kept for 1.2-1.5 hours;

Step 3: Sampling from the power frequency electric furnace, checking whether the composition and the weight ratio of each component satisfy zinc: tin: copper = 1.5-3.5: 3.5-7.5: 89.45-91.95, if satisfied, the solution is qualified;

Step 4: Proportionally place bismuth, silicon carbide and alumina in a crucible furnace and heat to 350-400 ° C for 50-60 minutes, and stir with a graphite rod. The stirring speed is 350r/Min to promote uniformity of silicon carbide. The distribution is in the solution of hydrazine, and the temperature is kept for 20-30 minutes after the completion of the stirring;

Step 5: Add the solution of silicon carbide, germanium and aluminum oxide after the completion of the step 4 to the solution which has passed the test in step 3, and stir again with a graphite rod, the stirring speed is 400r/min and the temperature is increased to 1100-1500. °C, again sampled from the power frequency electric furnace, check whether the composition and the weight ratio of each component meet zinc: tin: copper: 铋: silicon carbide: alumina = 1.5-3.5: 3.5-7.5: 89.45-91.95: 0.3-1.0: 0.15-0.5:0.1-0.5, if satisfied, the solution is qualified;

Step 6: Sampling the solution that has passed the test in step 5, and after the solidification and polishing, the metal phase is observed, and if the grain structure is uniform, the solution is qualified;

Step 7: After the solution that has passed the test in step 6 is kept for 30-40 minutes, the temperature is raised again. 1200 ° C, and open the vibration device of the power frequency electric furnace, the vibration frequency is 6 times / sec, cast into a hollow alloy pipe with an outer diameter of Φ25mm-Φ200mm, an inner diameter of Φ10mm-Φ160mm and a length of 500mm by horizontal continuous casting method;

Step 8: Surface turning of the alloy pipe with a high-precision lathe to a surface tolerance of ±0.1 mm, and deburring the ends of the alloy tube and packaging it into the warehouse.

Further, in step 3, the sample taken from the power frequency electric furnace is subjected to three to five component inspections using a Spike direct reading spectrometer.

Compared with the prior art, the beneficial technical effects of the present invention are: replacing the traditional lead element with the strontium element, and adding the nano-scale silicon carbide material, according to a certain distribution ratio, the appropriate temperature, through the cold rise and contraction of the crucible The high toughness and high hardness of the properties and nano-silicon carbide and alumina materials produce a tin bronze that is completely capable of replacing lead. The invention satisfies the requirements for the environmental performance of the alloy without increasing the cost, and further improves the cutting performance and hardness of the alloy, and is more suitable for the wear-resistant parts of the high temperature (400 ° C) condition.

Detailed ways

The continuous casting alloy material for a bearing bush and the preparation method thereof provided by the present invention are further described below in conjunction with the embodiments, but are not intended to limit the scope of application of the present invention.

Example 1

The weight percentage of each component of the continuous casting alloy material for the bearing bush of Embodiment 1 of the present invention is: zinc 2 wt%, tin 5 wt%, niobium 0.7 wt%, silicon carbide 0.3 wt%, alumina 0.2 wt%, copper the amount.

A method for preparing a continuous casting alloy material for a bearing bush according to Embodiment 1 of the present invention comprises the following steps:

Step 2: After thoroughly stirring the alloy liquid obtained in the step 1 with a graphite tool, it is covered with a high-purity flaky graphite powder having a thickness of 8 cm to prevent oxidation thereof, and is kept for 1.3 hours;

Step 3: Sampling from a power frequency electric furnace, using a Spike direct reading spectrometer to perform a three-component test on the sample taken from the power frequency electric furnace to check whether the composition and the weight ratio of each component satisfy zinc: tin: copper = 3: 6: 89.9 , the solution is qualified;

Step 4: Proportionally place bismuth, silicon carbide and alumina in a crucible furnace and heat to 380 ° C for 55 minutes, and stir with a graphite rod. The stirring speed is 350r/Min, which promotes the uniform distribution of silicon carbide in the crucible. In the solution, the mixture is kept for 25 minutes after the completion of the stirring;

Step 5: Add the solution of silicon carbide, ruthenium and alumina after the completion of the step 4 is added to the solution which has passed the test in step 3, and stir again with a graphite rod, the stirring speed is 400 r/min and the temperature is raised to 1300 ° C. The sample was again taken from a power frequency electric furnace, and the composition and the weight ratio of each component were determined to be zinc:tin:copper:铋:silicon carbide:alumina=3:6:89.8:0.7:0.3:0.2, and the solution was qualified;

Step 6: Sampling from the solution that has passed the test in step 5, after it is solidified and polished, the metallographic phase is observed, the grain structure is uniform, and the solution is qualified;

Step 7: After the solution qualified in step 6 is kept for 35 minutes, the temperature is raised again to 1200 ° C, and the vibration device of the power frequency electric furnace is turned on, the vibration frequency is 6 times / sec, and the outer diameter is cast by the horizontal continuous casting method. Φ25mm, hollow alloy pipe with inner diameter of Φ10mm and degree of 500mm;

Further, in step 3, a sample taken from the power frequency electric furnace is subjected to a three-component test using a Spike direct reading spectrometer.

Example 2

The weight percentage of each component of the continuous casting alloy material for the bearing bush of Embodiment 1 of the present invention is: zinc 1.5 wt%, tin 7.5 wt%, 铋0.3 wt%, silicon carbide 0.5 wt%, alumina 0.3 wt%, Copper balance.

Step 1: Put electrolytic copper, tin and zinc on the power frequency according to the weight percentage under normal conditions. In the furnace, heated to 1180 ° C completely melted and then kept to 1000 ° C;

Step 2: After thoroughly stirring the alloy liquid obtained in the step 1 with a graphite tool, it is covered with a high-purity flaky graphite powder having a thickness of 6 cm to prevent oxidation thereof, and is kept for 1.2 hours;

Step 3: Sampling from the power frequency electric furnace, using the Spike direct reading spectrometer to carry out four component inspections on the samples taken from the power frequency electric furnace, and checking the composition and the weight ratio of each component to be zinc: tin: copper = 1.5: 7.5: 89.9 , the solution is qualified;

Step 4: Proportionally place bismuth, silicon carbide and alumina in a crucible furnace and heat to 350 ° C for 50 minutes, and stir with a graphite rod. The stirring speed is 350r/Min, which promotes the uniform distribution of silicon carbide in the crucible. In the solution, the mixture is kept for 20 minutes after the completion of the stirring;

Step 5: Add the solution of silicon carbide, bismuth and aluminum oxide after the completion of the step 4 to the solution which has passed the test in step 3, and stir again with a graphite rod, the stirring speed is 400r/min and the temperature is raised to 1100 ° C. The sample was again taken from a power frequency electric furnace, and the composition and the weight ratio of each component were determined to be zinc:tin:copper:铋:silicon carbide:alumina=1.5:7.5:89.9:0.3:0.5:0.3, and the solution was qualified;

Step 7: After the solution qualified in step 6 is kept for 30 minutes, the temperature is raised again to 1200 ° C, and the vibration device of the power frequency electric furnace is turned on, the vibration frequency is 6 times / sec, and the outer diameter is cast by the horizontal continuous casting method. Φ200mm, hollow alloy pipe with inner diameter of Φ160mm and length of 500mm;

Further, in step 3, the sample taken from the power frequency electric furnace was subjected to four component inspections using a Spike direct reading spectrometer.

Example 3

The weight percentage of each component of the continuous casting alloy material for the bearing bush of Embodiment 1 of the present invention is: zinc 3.5 wt%, tin 3.5 wt%, niobium 0.5 wt%, silicon carbide 0.15 wt%, alumina 0.4 Wt%, copper balance.

Step 2: After thoroughly stirring the alloy liquid obtained in the step 1 with a graphite tool, it is covered with a high-purity flaky graphite powder having a thickness of 10 cm to prevent oxidation thereof, and is kept for 1.5 hours;

Step 3: Sampling from the power frequency electric furnace, using the Spike direct reading spectrometer to carry out five component inspections on the sample taken from the power frequency electric furnace, and checking the composition and the weight ratio of each component to be zinc: tin: copper = 3.5: 3.5: 91.95 , the solution is qualified;

Step 4: Proportionally place bismuth, silicon carbide and alumina in a crucible furnace and heat to 400 ° C for 60 minutes, and stir with a graphite rod. The stirring speed is 350r/Min, which promotes the uniform distribution of silicon carbide in the crucible. In the solution, the mixture is kept for 30 minutes after the completion of the stirring;

Step 5: Add the solution of silicon carbide, ruthenium and alumina after the completion of the step 4 to the solution which has passed the test in step 3, and stir again with a graphite rod, the stirring speed is 400 r/min and the temperature is raised to 1500 ° C. Sampling again from the power frequency electric furnace, checking the composition and the weight ratio of each component is zinc: tin: copper: 铋: silicon carbide: alumina = 3.5: 3.5: 91.95: 0.5: 0.15: 0.4, the solution is qualified;

Step 7: After the solution qualified in step 6 is kept for 40 minutes, the temperature is raised again to 1200 ° C, and the vibration device of the power frequency electric furnace is turned on, the vibration frequency is 6 times / sec, and the outer diameter is cast by the horizontal continuous casting method. Φ100mm, hollow alloy pipe with inner diameter of Φ80mm and length of 500mm;

Further, step 3 uses a Spike direct reading spectrometer to take samples taken from the power frequency electric furnace. Five component tests were performed.

Example 4

The weight percentage of each component of the continuous casting alloy material for the bearing bush of Embodiment 1 of the present invention is: zinc 3 wt%, tin 4 wt%, niobium 1.0 wt%, silicon carbide 0.45 wt%, alumina 0.1 wt%, copper the amount.

Step 2: After thoroughly stirring the alloy liquid obtained in the step 1 with a graphite tool, it is covered with a high-purity flaky graphite powder having a thickness of 7 cm to prevent oxidation thereof, and is kept for 1.4 hours;

Step 3: Sampling from the power frequency electric furnace, using the Spike direct reading spectrometer to perform a six-component test on the sample taken from the power frequency electric furnace, and testing the composition and the weight ratio of each component to be zinc: tin: copper = 3: 4: 91.45 , the solution is qualified;

Step 4: Proportionally place bismuth, silicon carbide and alumina in a crucible furnace and heat to 360 ° C for 58 minutes, and stir with a graphite rod. The stirring speed is 350r/Min, which promotes the uniform distribution of silicon carbide in the crucible. In the solution, the mixture is kept for 27 minutes after the completion of the stirring;

Step 5: Add the solution of silicon carbide, germanium and aluminum oxide after the completion of the step 4 to the solution which has passed the test in step 3, and stir again with a graphite rod, the stirring speed is 400r/min and the temperature is raised to 1400 ° C. The sample was again taken from a power frequency electric furnace, and the composition and the weight ratio of each component were determined to be zinc:tin:copper:铋:silicon carbide:alumina=3:4:9.45:1.0:0.45:0.1, and the solution was qualified;

Step 7: After the solution qualified in step 6 is kept for 37 minutes, the temperature is raised again to 1200 ° C, and the vibration device of the power frequency electric furnace is turned on, the vibration frequency is 6 times / sec, and the outer diameter is cast by the horizontal continuous casting method. Φ100mm, hollow alloy with inner diameter of Φ80mm and length of 500mm Pipe

Further, in step 3, a sample taken from the power frequency electric furnace is subjected to three component tests using a Spike direct reading spectrometer.

Example 5

The weight percentage of each component of the continuous casting alloy material for the bearing bush of Embodiment 1 of the present invention is: zinc 2.5% by weight, tin 6.5 wt%, 铋0.8 wt%, silicon carbide 0.25 wt%, alumina 0.5 wt%, Copper balance.

Step 3: Sampling from the power frequency electric furnace, using a Spike direct reading spectrometer to perform a three-component test on the sample taken from the power frequency electric furnace, and checking the composition and the weight ratio of each component to be zinc: tin: copper = 2.5: 6.5: 89.45, The solution is qualified;

Step 5: Add the solution of silicon carbide, ruthenium and alumina after the completion of the step 4 is added to the solution which has passed the test in step 3, and stir again with a graphite rod, the stirring speed is 400 r/min and the temperature is raised to 1300 ° C. Sampling again from the power frequency electric furnace, checking the composition and the weight ratio of each component is zinc: tin: copper: 铋: silicon carbide: alumina = 2.5: 5.5: 89.45: 0.8: 0.25: 0.5, the solution is qualified;

Step 6: Sampling from the solution that passed the test in step 5, waiting for it to solidify and polishing to observe the gold Phase, uniform grain structure, qualified solution;

Step 7: After the solution qualified in step 6 is kept for 35 minutes, the temperature is raised again to 1200 ° C, and the vibration device of the power frequency electric furnace is turned on, the vibration frequency is 6 times / sec, and the outer diameter is cast by the horizontal continuous casting method. Φ150mm, hollow alloy pipe with inner diameter of Φ100mm and length of 500mm;

Further, in step 3, a sample taken from the power frequency electric furnace was subjected to five component inspections using a Spike direct reading spectrometer.

The performance of a continuous casting alloy material for a bearing bush prepared according to the present invention and a conventional lead-containing bronze material is shown in Figure 1:

Table 1

品名Product name	硬度(HBS)Hardness (HBS)	抗拉强度(MPa)Tensile strength (MPa)
实施例1Example 1	110110	380380
实施例2Example 2	100100	450450
实施例3Example 3	120120	310310
实施例4Example 4	118118	360360
实施例5Example 5	104104	420420
传统含铅青铜材料Traditional lead-containing bronze material	70-8070-80	270270

As can be seen from the data of Table 1 above, the hardness and tensile strength of the continuously cast alloy material for the bearing pad according to the present invention are significantly improved.

The above-mentioned embodiments are merely illustrative of the embodiments of the present invention, and the description thereof is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

A continuous casting alloy material for a bearing bush characterized by being composed of the following components by weight: zinc 1.5-3.5 wt%, tin 3.5-7.5 wt%, 铋0.3-1.0 wt%, silicon carbide 0.15-0.5 Wt%, alumina 0.1-0.5 wt%, copper balance.
A continuously cast alloy material for a bearing bush according to claim 1, which is composed of the following components by weight: zinc 2 wt%, tin 5 wt%, niobium 0.7 wt%, silicon carbide 0.3 wt%, alumina 0.2wt%, copper balance.
A continuously cast alloy material for a bearing bush according to claim 1, which is composed of the following components by weight: zinc 1.5 wt%, tin 7.5 wt%, rhodium 0.3 wt%, silicon carbide 0.5 wt%, Alumina 0.3 wt%, copper balance.
A continuously cast alloy material for a bearing bush according to claim 1, which is composed of the following components by weight: zinc 3.5 wt%, tin 3.5 wt%, 铋 0.5 wt%, silicon carbide 0.15 wt%, Alumina 0.4 wt%, copper balance.
A continuously cast alloy material for a bearing pad according to any one of claims 1 to 4, characterized in that the cerium is a high purity cerium having a purity of more than 99.99%.
A continuously cast alloy material for a bearing bush according to any one of claims 1 to 4, wherein the silicon carbide is silicon carbide particles having a particle diameter of more than 5 μm and less than 50 μm.
A continuously cast alloy material for a bearing bush according to any one of claims 1 to 4, characterized in that the alumina is alumina particles having a particle diameter of more than 50 μm and less than 100 μm.
A method of preparing a continuous casting alloy material for a bearing bush according to any one of claims 1 to 7, characterized by the following steps:

Step 1: under normal conditions, the electrolytic copper, tin, zinc are placed in a power frequency electric furnace according to the weight percentage, heated to 1180 ° C completely melted and then kept to 1000 ° C;

Step 2: After thoroughly stirring the alloy liquid obtained in the step 1 with a graphite tool, it is covered with a high-purity flaky graphite powder having a thickness of 6-10 cm to prevent oxidation thereof, and is kept for 1.2-1.5 hours;

Step 3: sampling from the power frequency electric furnace, checking whether the composition and the weight ratio of each component satisfy zinc: tin: copper = 1.5-3.5: 3.5-7.5: 89.45-91.95, and if satisfied, the solution is qualified;

Step 4: Proportionally place bismuth, silicon carbide and alumina in a crucible furnace and heat to 350-400 ° C for 50-60 minutes, and stir with a graphite rod. The stirring speed is 350r/Min to promote uniformity of silicon carbide. The distribution is in the solution of hydrazine, and the temperature is kept for 20-30 minutes after the completion of the stirring;

Step 5: Add the solution of silicon carbide, germanium and aluminum oxide after the completion of the step 4 to the solution which has passed the test in step 3, and stir again with a graphite rod, the stirring speed is 400r/min and the temperature is increased to 1100-1500. °C, again sampled from the power frequency electric furnace to check whether the composition and the weight ratio of each component satisfy zinc: tin: copper: 铋: silicon carbide: alumina = 1.5-3.5: 3.5-7.5: 89.45-91.95: 0.3- 1.0:0.15-0.5:0.1-0.5, if satisfied, the solution is qualified;

Step 6: Sampling the solution that has passed the test in step 5, and after the solidification and polishing, the metal phase is observed, and if the grain structure is uniform, the solution is qualified;

Step 7: After the solution qualified in step 6 is kept for 30-40 minutes, the temperature is raised again to 1200 ° C, and the vibration device of the power frequency electric furnace is turned on, the vibration frequency is 6 times / sec, and the method is cast by horizontal continuous casting method. a hollow alloy pipe having an outer diameter of Φ25 mm-Φ200 mm and an inner diameter of Φ10 mm-Φ160 mm and a length of 500 mm;

Step 8: Surface turning of the alloy pipe with a high-precision lathe to a surface tolerance of ±0.1 mm, and deburring the ends of the alloy tube and packaging it into the warehouse.
The preparation method according to claim 8, wherein the step 3 performs a three to five component inspection on the sample taken from the power frequency electric furnace by using a Spike direct reading spectrometer.