WO2017070807A1

WO2017070807A1 - Tib2-reinforced cast-bronze alloy and method for preparing the alloy

Info

Publication number: WO2017070807A1
Application number: PCT/CN2015/000868
Authority: WO
Inventors: 陆海荣; 孙飞; 赵勇
Original assignee: 苏州天兼新材料科技有限公司
Priority date: 2015-10-30
Filing date: 2015-12-04
Publication date: 2017-05-04
Also published as: CN105200265A

Abstract

A titanium diboride particle-reinforced bronze alloy material, consisting of the following compositions: 2.0-4.0 mass% of Sn, 6.0-9.0 mass% of Zn, 4.0-7.0 mass% of Pb, 0.5-1.5 mass% of Ni, 2.5-4.5 mass% of TiB₂, and the remainder being Cu and unavoidable impurities. By allowing the bronze alloy material to contain a certain amount of titanium diboride, the strength, hardness, and stretchability are all improved significantly. Also provided is a method for use in preparing the titanium boride particle-reinforced copper alloy material.

Description

TiB2 reinforced cast bronze alloy and method for manufacturing the same

Technical field

The present invention relates to a TiB ₂ reinforced cast bronze alloy and a method of making the same.

Background technique

The national standard copper alloy ZCuSn3Zn8Pb6Ni1 is a multi-component cast bronze material, which has the advantages of good wear resistance, easy processing, good casting performance, good air tightness and corrosion resistance. However, due to the lack of strength of the material itself, its application in marine engineering is greatly limited. In order to expand its application in marine engineering, it is necessary to further improve the mechanical properties such as the strength of the material while ensuring that its original characteristics are not affected.

TiB ₂ titanium diboride is a gray or grayish black powder or crystal material with hexagonal crystal structure, high hardness, high melting point, excellent thermal stability, oxidation resistance and electrical conductivity, and oxidation resistance temperature in air. It can reach 1000 ° C, and it does not chemically react in hydrochloric acid and hydrofluoric acid, and its properties are stable. Therefore, it is mainly used for the manufacture of conductive ceramic materials, ceramic cutting tools, molds, and composite ceramic materials.

Particle reinforced composite materials are one of the research hotspots in recent years. The elastic modulus, strength, wear resistance, high temperature strength and fracture toughness of the alloy can be effectively improved by uniformly dispersing particles of a micron-sized carbide, nitride, boride or the like in the alloy. However, there have been no reports of using TiB ₂ particles to improve copper-based alloys.

Summary of the invention

Problem to be solved by the invention

In view of the above, the present invention proposes the use of TiB ₂ particles to enhance the ZCuSn3Zn8Pb6Ni1 casting green steel alloy material to improve its mechanical properties such as strength and thereby expand its application, especially in marine engineering.

Specifically, the present invention achieves the object by the following technical solutions:

According to an embodiment of the present invention, there is provided a TiB ₂ reinforced cast bronze alloy which is composed of 2.0 to 4.0% by mass of Sn, 6.0 to 9.0% by mass of Zn, 4.0 to 7.0% by mass of Pb, and 0.5. ～1.5% by mass of Ni, 2.5-4.5% by mass of TiB ₂ , and the balance being Cu and unavoidable impurities.

According to one embodiment of the present invention, the TiB ₂ reinforced cast bronze alloy further has a TiB ₂ particle diameter of 600 μm to 900 μm and a purity of more than 98%.

According to one embodiment of the present invention, a TiB ₂ reinforced cast bronze alloy, further, the Sn content is 3.0% by mass.

According to one embodiment of the present invention, a TiB ₂ reinforced cast bronze alloy, further, the Zn content is 7.5% by mass.

According to one embodiment of the present invention, a TiB ₂ reinforced cast bronze alloy, further, the Ni content is 1.0% by mass.

According to an embodiment of the present invention, there is provided a method for preparing a TiB ₂ reinforced cast bronze alloy as described above, comprising the steps of:

Step 1: Weigh the predetermined mass ratio of electrolytic copper, Sn, Zn, Pb and Ni, and smelt them in an electric furnace. During the smelting, the volume of the copper alloy melt is controlled to be less than 99% of the volume of the furnace according to the volume of the furnace. The smelting temperature is 1000-1100 ° C, and the time is 4-4.5 hours;

Step 2: detecting the composition of the copper alloy melt, if the composition meets the requirements, continue the following steps, otherwise adjust the content of each element and test again until the composition meets the requirements;

Step 3: adding a predetermined mass ratio of TiB ₂ particles to the tested copper alloy melt, turning on the vibration device of the power frequency electric furnace and stirring, uniformly mixing, and further increasing the temperature to be smelted after the uniform mixing is completed. The smelting temperature is: 1450-1550 ° C and the smelting time is kept for 25-35 minutes;

Step 4: The smelted alloy material is kept at a temperature of 1200-1250 ° C, The time is 30-35 minutes, and the alloy is cast into an alloy rod at a holding temperature of 1200-1250 ° C by continuous casting;

Step 5: The cast alloy bar is subjected to surface processing and packaging.

According to an embodiment of the present invention, there is provided a method of preparing a TiB ₂ reinforced cast bronze alloy, and further, in the first step, the electric furnace is under an argon atmosphere.

According to an embodiment of the present invention, there is provided a method of preparing a TiB ₂ reinforced cast bronze alloy, and further, the tool for performing the stirring in the third step is a graphite rod.

Through the invention, a TiB ₂ particle reinforced bronze alloy material is provided, and the strength thereof is significantly improved compared with the original national standard ZCuSn3Zn8Pb6Ni1 alloy material, and can be applied to a required high corrosion resistance, and requires a high strength ocean. In the project.

DRAWINGS

Figure 1: Flow chart of the preparation process of the bronze alloy of the present invention.

detailed description

A bronze alloy of the composition shown in Table 1 below was obtained by the following procedure:

Step 1: In the experimental conditions of GB/T 1176-2013, it is required to weigh electrolytic copper, Sn, Zn, Pb and Ni as shown in Table 1 below, and smelt them in an electric furnace protected by argon atmosphere. According to the volume of the furnace, the volume of copper water is controlled to be less than 99% of the volume of the furnace, and the melting temperature is maintained at 1000-1100 ° C for a duration of 4 to 4.5 hours;

Step 2: The Spike direct-reading spectrometer is used to test the composition of the molten copper alloy melt to determine whether its chemical composition is within the range required by Table 1 in consideration of the error. If it does not meet the requirements, adjust the corresponding Element content and retest until it meets the requirements;

Step 3: After the content of each component of the copper alloy melt is verified to meet the requirements, the titanium diboride powder having a mass ratio of 600 μm shown in Table 1 below is placed in the copper alloy melt, and then the power frequency electric furnace is turned on. The vibrating device was stirred with a graphite rod to uniformly mix, and after the uniform mixing was completed, the temperature was further raised to 1450-1550 ° C for 25-35 minutes.

Step 4: Insulation and casting, the smelted alloy material is insulated, the holding temperature is 1200-1250 ° C, the time is 30-35 minutes, and the alloy is cast by continuous casting at a holding temperature of 1200-1250 ° C. Alloy bar.

Step 5: The finished casting and the alloy bar are subjected to surface turning processing to obtain the finished product and packaged according to the factory standard of the export-free fumigation wooden box packaging.

Table 1: Composition and content of bronze alloy

Further, a bronze alloy shown in the following Table 2 was prepared by the method described above, which was the same as the composition of Example 1-2, except that the TiB ₂ particle diameters added in the step 3 were respectively 700, 800 and 900 μm.

Table 2: Composition and content of bronze alloy

Brinell hardness measurement: the samples were taken by electric spark cutting from the middle of the ingots with different compositions, and the EDM cutting effect layer was sanded, and further 400 mesh, 600 mesh, 800 mesh, 1200 mesh were used respectively. After the 2000-mesh sandpaper was polished, the polishing treatment was performed, and the Brinell hardness of the above alloy was measured by a Brinell hardness tester of the model MC010-HBS-3000. The pressed material used in the measurement process was a hardened steel ball with a diameter of 10 mm, and a load of 3000 kg was applied. Each sample was averaged after being measured at five different positions.

Tensile strength and elongation measurement: The electroless spark cutting method was used to intercept the tensile specimen from the ingot, and the electrospark cutting effect was used to remove the electrospark cutting influence layer, and further 400 mesh, respectively. Polishing treatment was carried out after grinding of 600 mesh, 800 mesh, 1200 mesh, and 2000 mesh sandpaper. After that, the tensile strength and elongation of the above alloys were measured by the tensile rate of 3 mm/min of the WDW-500E/600E microcomputer-controlled electronic universal testing machine.

The specific results of the mechanical properties are shown in Table 3 below:

Table 3: Mechanical properties of different alloys

It can be seen from the above Table 3 that the hardness, strength and elongation of the national standard ZCuSn3Zn8Pb6Ni1 bronze alloy can be effectively improved by adding 2.5 to 4.5% by mass of titanium diboride.

The instrumental and operational steps and parameters described above are to be understood as being illustrative and not limiting, and modifications may be made within the scope of the above description and claims. That is, the scope of the invention should be determined with reference to the full scope of the appended claims, rather than the above description. In sum, it should be understood that the invention is capable of various modifications and changes.

Industrial applicability

The invention effectively improves the mechanical properties such as strength and hardness of the bronze alloy by adding micron-sized TiB ₂ particles to the national standard ZCuSn3Zn8Pb6Ni1 alloy, so that it can be applied to marine engineering, thereby expanding the application range of the bronze alloy. with broadly application foreground.

Claims

A TiB 2 reinforced cast bronze alloy characterized by comprising: 2.0 to 4.0% by mass of Sn, 6.0 to 9.0% by mass of Zn, 4.0 to 7.0% by mass of Pb, and 0.5 to 1.5% by mass. Ni, 2.5-4.5% by mass of TiB 2 , the balance being Cu and unavoidable impurities.
The TiB 2 reinforced cast bronze alloy according to claim 1, wherein the TiB 2 has a particle diameter of 600 μm to 900 μm and a purity of more than 98%.
The TiB 2 reinforced cast bronze alloy according to claim 1 or 2, wherein the Sn content is 3.0% by mass.
The TiB 2 reinforced cast bronze alloy according to claim 1 or 2, wherein the Zn content is 7.5% by mass.
The TiB 2 reinforced cast bronze alloy according to claim 1 or 2, wherein the Ni content is 1.0% by mass.
A method for producing a TiB 2 reinforced cast bronze alloy according to any one of claims 1 to 5, comprising the steps of:

Step 1: The electrolytic copper, Sn, Zn, Pb and Ni are weighed according to any one of claims 1 to 5, and are smelted in an electric furnace, and the copper alloy is controlled according to the volume of the furnace during the smelting. The melt volume is less than 99% of the volume of the furnace, the melting temperature is 1000-1100 ° C, and the time is 4-4.5 hours;

Step 2: detecting the composition of the copper alloy melt, if the composition meets the requirements, continue the following steps, otherwise adjust the content of each element and test again until the composition meets the requirements;

Step 3: adding a predetermined mass ratio of TiB 2 particles to the tested copper alloy melt, turning on the vibration device of the power frequency electric furnace and stirring, uniformly mixing, and further increasing the temperature to be smelted after the uniform mixing is completed. The smelting temperature is: 1450-1550 ° C and the smelting time is kept for 25-35 minutes;

Step 4: The smelted alloy material is kept at a temperature of 1200-1250 ° C for 30-35 minutes, and the continuous casting method is used at a holding temperature of 1200-1250 ° C. The alloy is cast into an alloy rod;

Step 5: Surface-processing the cast alloy bar to obtain a finished product.
The method of claim 6 wherein said electric furnace of step one is under an argon atmosphere.
The method according to claim 6, wherein the means for performing the agitation in the third step is a graphite rod.