Novel outflow pipe for copper and copper alloy casting and preparation method thereof

Abstract

The invention discloses a novel outflow pipe for copper and copper alloy casting and a preparation method thereof.The novel outflow pipe for copper and copper alloy casting is formed by mixing and casting, by weight, 20-25 parts of SiC, 55-65 parts of Al2O3, 8-10 parts of MgO, 1.5-2 parts of TiO2, 0.5-0.8 part of sodium silicate and 2-5 parts of ammonium borate. The prepared novel outflow pipe for copper and copper alloy casting has the advantages of being stable in property, not prone to oxidation, compact in structure, firm and durable, and capable of being well used for copper and copper alloy casting. After use, the inner wall of the outflow pipe is smooth, residual metal is not easy to adhere to the outflow pipe, and the outflow pipe can be used repeatedly; the novel outflow pipe for copper and copper alloy casting ensures stable properties in the casting process, can be used for multiple times in a high-temperature aerobic environment, effectively improves the product quality, reduces the production cost, and has a good application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of copper and copper alloy casting, and particularly relates to a novel outlet pipe for copper and copper alloy casting and a preparation method thereof. Background Art

[0002] In the copper and copper alloy casting industry, a flow tube made of graphite is used to guide the copper liquid during casting. Graphite products react with oxygen under high temperature and oxidize, resulting in loss and failure of the flow tube. At present, in order to prevent graphite from oxidizing at high temperature during casting of copper and copper alloys, an anti-oxidation coating is generally applied to the outer layer of the graphite flow tube to slow down the oxidation rate of graphite. This method has a certain inhibitory effect on graphite oxidation, but the part where the inner cavity of the graphite flow tube contacts the copper liquid, due to direct contact with the high-temperature copper liquid, the oxygen element in the high-temperature copper liquid reacts with the graphite, resulting in corrosion of large and small pits in the inner cavity of the graphite flow tube. Under the impact of the flow of high-temperature copper liquid, it is gradually damaged. At the end of casting, the metal remains in the rough and uneven inner cavity surface of the flow tube, resulting in blockage of the inner cavity of the flow tube and making it unable to continue to be used.

[0003] The oxidation rate of the outer layer of the graphite outlet tube is slowed down by applying an anti-oxidation coating on the outer layer, but there is still no solution to the oxidation of the inner cavity of the graphite outlet tube. In addition, the outlet tube is blocked due to the metal remaining in the inner cavity of the graphite and cannot be used any further, resulting in increased costs.

[0004] Therefore, designing a new type of outlet pipe for copper and copper alloy casting to ensure the stability of the casting process and to allow repeated use is an effective way to improve product quality and reduce production costs, and is crucial to industrial production. Summary of the invention

[0005] In view of the problem that during the casting process of copper and copper alloys, outlet tubes made of graphite material are prone to oxidation under high temperature conditions and the properties of product materials are unstable, the present invention provides a new outlet tube for casting copper and copper alloys and a preparation method thereof, which ensures the stability of the properties of the casting process and can be used multiple times in a high-temperature aerobic environment, effectively improving product quality and reducing production costs.

[0006] The present invention is achieved through the following technical solutions: A novel outlet pipe for copper and copper alloy casting is prepared by mixing and casting the following components in parts by weight: 20-25 parts of SiC, 55-65 parts of Al2O3, 8-10 parts of MgO, 1.5-2 parts of TiO2, 0.5-0.8 parts of sodium silicate and 2-5 parts of ammonium borate.

[0007] Furthermore, the method for preparing the novel outlet pipe for copper and copper alloy casting comprises the following steps: (1) During the stirring process, SiC particles, MgO particles, and TiO2 particles are sequentially added to the Al2O3 particles, and after mixing, sodium silicate and ammonium borate are added and mixed to obtain a mixture; (2) The mixture of step (1) is pounded into a mold and sintered at high temperature to obtain a novel outlet pipe for copper and copper alloy casting.

[0008] Furthermore, the SiC particle size is 0.2-0.5 mm; the Al2O3 particle size is 0.5~5.0 mm; the MgO particle size is 0.05~2 mm; and the TiO2 particle size is 0.05~0.2 mm.

[0009] Furthermore, the Al2O3 includes 30-35% Al2O3 with a particle size of 0.5-1.0 mm, 35-40% Al2O3 with a particle size of 1.0-2.5 mm, and 25-30% Al2O3 with a particle size of 2.5-5.0 mm.

[0010] Furthermore, the sodium silicate is added in the form of 45-55% water-soluble sodium silicate, and the ammonium borate is added in the form of an ammonium borate aqueous solution, the mass percentage concentration of the ammonium borate aqueous solution is 20-25%, and it is added by spraying using a high-pressure spray bottle.

[0011] Furthermore, the water-soluble silicate is water-soluble sodium silicate.

[0012] Furthermore, in step (2), the high temperature sintering temperature is 650-680°C, and the high temperature sintering time is 4-6h.

[0013] Furthermore, the material sintered at high temperature in step (2) is naturally cooled to room temperature and then polished with sandpaper to make it smooth.

[0014] Beneficial Effects The new type of outlet pipe for copper and copper alloy casting prepared by the present invention has the characteristics of stable properties and not easy to oxidize. It has a compact structure, is strong and durable, and can be well used for copper and copper alloy casting. After use, the inner wall of the outlet pipe is smooth, and it is not easy to adhere to residual metal, and it can be used many times; the new type of outlet pipe for copper and copper alloy casting in the present invention ensures the stability of the casting process, can be used many times in a high temperature oxygen environment, effectively improves product quality, reduces production costs, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram of a new type of outlet pipe spare mold for copper and copper alloy casting according to the present invention. DETAILED DESCRIPTION

[0016] The following is a comprehensive and detailed description of the technical solutions involved in this patent. The examples described are only part of the embodiments of the present invention, not all. Based on the embodiments of the present invention, other embodiments without creative adjustments to the design ideas are within the protection scope of the present invention.

[0017] Example 1 (1) 22 parts of SiC were crushed into particles with a particle size of 0.2-0.5 mm, 60.2 parts of Al2O3 were crushed and sieved, with the particle size of 0.5-1.0 mm accounting for 35%, the particle size of 1.0-2.5 mm accounting for 35%, and the particle size of 2.5-5.0 mm accounting for 30%; 10 parts of MgO were crushed into particles with a particle size of 0.05-0.2 mm; 2 parts of TiO2 were crushed into particles with a particle size of 0.05-0.2 mm; 5 parts of ammonium borate were prepared into an aqueous solution with a mass percentage concentration of 25%; (2) Al2O3 particles of different sizes are mixed in a mixer according to the proportion. During the mixing process, SiC particles, MgO particles, and TiO2 particles are added in sequence. After mixing for 5 minutes, 0.8 parts of a 50wt% water-soluble sodium silicate and ammonium borate aqueous solution is sprayed into the mixed particles using a high-pressure spray bottle, and the mixing is continued to obtain a mixture. (3) The mixture of step (2) is placed in a corresponding mold (the mold is as shown in FIG. Figure 1 The copper and copper alloy castings are rammed and formed in a box furnace for high-temperature sintering at a temperature of 680°C and a sintering time of 4 hours. After the sintered discharge pipe is cooled, the surface is polished and smoothed with sandpaper to obtain a new type of discharge pipe for copper and copper alloy casting.

[0018] The new type of outlet pipe for copper and copper alloy casting prepared in Example 1 of the present invention shows good application effect. A 15t vertical semi-continuous casting unit is used to cast copper flat square ingots. The copper liquid temperature is 1180°C. Compared with the traditional graphite outlet pipe, the use effect is shown in Table 1 below: Table 1 As can be seen from Table 1, the new outlet pipe for copper and copper alloy casting prepared by the present invention shows good application effect. Compared with the traditional graphite outlet pipe, the service life is increased by 600%.

[0019] Example 2 (1) 25 parts of SiC were crushed into particles with a particle size of 0.2-0.5 mm, 60 parts of Al2O3 were crushed and sieved, and the particle size of 0.5-1.0 mm accounted for 33%, the particle size of 1.0-2.5 mm accounted for 37%, and the particle size of 2.5-5.0 mm accounted for 30%; 8 parts of MgO were crushed into particles with a particle size of 0.05-0.2 mm; 2 parts of TiO2 were crushed into particles with a particle size of 0.05-0.2 mm; 4.3 parts of ammonium borate were prepared into an aqueous solution with a mass percentage concentration of 25%; (2) Al2O3 particles of different sizes are mixed in a mixer according to the proportion. During the mixing process, SiC particles, MgO particles, and TiO2 particles are added in sequence. After mixing for 5 minutes, 0.7 parts of a 50wt% water-soluble sodium silicate and ammonium borate aqueous solution is sprayed into the mixed particles using a high-pressure spray bottle, and the mixing is continued to obtain a mixture. (3) The mixture of step (2) is placed in a corresponding mold (the mold is as shown in FIG. Figure 1 The copper and copper alloy castings are rammed and formed in a box furnace for high-temperature sintering at a temperature of 650°C and a sintering time of 5 hours. After the sintered discharge pipe is cooled, the surface is smoothed with sandpaper to obtain a new type of discharge pipe for copper and copper alloy casting.

[0020] The new type of outlet pipe for copper and copper alloy casting prepared in Example 1 of the present invention shows good application effect. A 15t vertical semi-continuous casting unit is used to cast copper flat square ingots. The copper liquid temperature is 1180°C. Compared with the traditional graphite outlet pipe, the use effect is shown in Table 2 below: Table 2 As can be seen from Table 2, the new outlet pipe for copper and copper alloy casting prepared by the present invention shows good application effect. Compared with the traditional graphite outlet pipe, its service life is increased by 580%.

[0021] The above examples are only preferred examples of the present invention and are not intended to limit the present invention. Except for the technical features described in the specification, all other technical features are known to those skilled in the art.

Claims

1. A new type of outlet pipe for copper and copper alloy casting, characterized in that: The invention comprises the following components in parts by weight, which are mixed and casted: 20-25 parts of SiC, 55-65 parts of Al2O3, 8-10 parts of MgO, 1.5-2 parts of TiO2, 0.5-0.8 parts of sodium silicate and 2-5 parts of ammonium borate.

2. A method for preparing a novel outlet pipe for copper and copper alloy casting according to claim 1, characterized in that: The following steps are involved: (1) During the stirring process, SiC particles, MgO particles, and TiO2 particles are sequentially added to the Al2O3 particles, and after mixing, sodium silicate and ammonium borate are added and mixed to obtain a mixture; (2) The mixture of step (1) is pounded into a mold and sintered at high temperature to obtain a novel outlet pipe for copper and copper alloy casting.

3. The method for preparing a novel outlet pipe for copper and copper alloy casting according to claim 2, characterized in that: The SiC particle size is 0.2-0.5 mm; the Al2O3 particle size is 0.5-5.0 mm; the MgO particle size is 0.05-2 mm; and the TiO2 particle size is 0.05-0.2 mm.

4. The method for preparing a novel outlet pipe for copper and copper alloy casting according to claim 3, characterized in that: The Al2O3 comprises 30-35% Al2O3 with a particle size of 0.5-1.0 mm, 35-40% Al2O3 with a particle size of 1.0-2.5 mm and 25-30% Al2O3 with a particle size of 2.5-5.0 mm.

5. The method for preparing a novel outlet pipe for copper and copper alloy casting according to claim 2, characterized in that: The sodium silicate is added in the form of 45-55% water-soluble sodium silicate, and the ammonium borate is added in the form of an ammonium borate aqueous solution with a mass percentage concentration of 20-25%, and is added by spraying with a high-pressure spray bottle.

6. The method for preparing a novel outlet pipe for copper and copper alloy casting according to claim 5, characterized in that: The water-soluble silicate is water-soluble sodium silicate.

7. The method for preparing a novel outlet pipe for copper and copper alloy casting according to claim 2, characterized in that: In step (2), the high temperature sintering temperature is 650-680°C, and the high temperature sintering time is 4-6h.

8. The method for preparing a novel outlet pipe for copper and copper alloy casting according to claim 2, characterized in that: After the high temperature sintering in step (2), the material is naturally cooled to room temperature and then polished with sandpaper to make it smooth.

Images