Casting method and application of rare earth metal ceramic composite casting

Abstract

The invention discloses a casting method and application of a rare earth metal ceramic composite casting, and belongs to the technical field of casting of wear-resistant castings. The invention discloses a casting method of a rare earth metal ceramic composite casting. The casting method comprises the following steps: S1, casting a solid model of the casting; s2, brushing a rare earth metal ceramic raw material; s3, common evanescent mode casting coating is brushed; s4, burying in a sand mold for casting; and S5, water toughening treatment is conducted, and a casting head system is removed. According to the casting method of the rare earth metal ceramic composite casting, the cast casting has excellent wear resistance and impact toughness and high overall strength, and can be used for casting of castings such as ball milling and lining plates with high requirements for wear resistance and wear resistance; the casting method of the rare earth metal ceramic composite casting is simple and easy to operate, does not need high temperature and high pressure, has low requirements on equipment and is easy for industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of wear-resistant castings, in particular to a casting method of a rare earth metal ceramic composite casting and application thereof. Background Art

[0002] At present, in equipment in industries such as cement, coal, metallurgy, and mining, some wear-resistant alloy materials are often used to make crusher liners for crushing and grinding ore, coal, cement, and other materials. However, there are still some problems with the use of traditional wear-resistant parts. For example, castings can only exert high wear resistance when austenite is transformed into martensite under high impact. Under low impact, the wear resistance of its austenite matrix is ​​poor, and the use effect is also affected; in addition, some high-chromium cast iron or high-chromium steel wear-resistant liners have poor impact resistance and may crack and be scrapped due to large impact during use, reducing their use efficiency and service life, making it difficult to meet the requirements of large industrial production.

[0003] The Chinese invention patent with application number 201810645302.2 discloses a metal-ceramic composite wear-resistant lining plate and a preparation method thereof. The metal-ceramic composite wear-resistant lining plate disclosed in the invention comprises a porous ceramic matrix and a metal matrix filled in the pores of the porous ceramic matrix. The porous ceramic matrix comprises a first substrate, a second substrate and a reinforcing plate. The reinforcing plate is vertically inlaid inside the first substrate and the second substrate. The first substrate, the second substrate and the reinforcing plate are provided with a plurality of casting through holes. The first substrate, the second substrate and the reinforcing plate are placed in a casting mold, and then the melted metal material is poured into the casting mold, and the metal-ceramic composite wear-resistant lining plate is formed after cooling. The advantage is that the overall strength, impact toughness and wear resistance of the lining plate are improved, but a continuous metal-ceramic material cannot be formed on the surface of the lining plate, and the wear resistance is low. Summary of the invention

[0004] The purpose of the present invention is to provide a casting method of a rare earth metal ceramic composite casting and its application, so as to solve the problem in the prior art that wear-resistant castings need to be under higher impact to exert higher wear resistance and have great limitations on the requirements for casting materials.

[0005] To achieve the above object, the present invention provides a casting method for a rare earth metal ceramic composite casting, comprising the following steps: S1. Cast the physical model of the required casting according to the needs, and open the pouring and rising system; S2, adding rare earth metal ceramic raw materials to the adhesive, stirring and mixing, and applying on the surface of the solid model of the casting. The thickness of the application is determined according to actual needs, and drying after the application is completed; The rare earth metal ceramic raw material includes the following components in parts by weight: 0.01% to 0.05% of lanthanum cerium rare earth oxide, 0.1% to 10% of carbon powder, 0.5% to 30% of titanium powder, 1% to 50% of boron carbide powder, and 5% to 50% of iron powder; the adhesive is one or two of phenolic resin and silicone resin; the mass volume ratio of the rare earth metal ceramic raw material to the adhesive is 1g:1.2mL; S3, applying ordinary lost foam casting coating on the upper surface of the rare earth metal ceramic raw material, and then drying; S4, burying the dried solid model of the casting in the sand mold, with the pouring system facing upward, vibrating and vacuuming, and pouring molten steel; S5. After cooling, a casting is obtained, and the casting is subjected to water toughening treatment. The pouring and riser system is cut and removed, so as to obtain a rare earth metal ceramic composite casting.

[0006] Preferably, the solid model of the casting in step S1 is prepared by using foam plastic, and the foam plastic is selected from one of EPS, STMMA and EPMMA.

[0007] Preferably, the drying in steps S2 and S3 is performed at 50-55°C.

[0008] Preferably, the casting is a liner, a grinding ball or other castings.

[0009] A casting method for rare earth metal ceramic composite castings as described above is applied to the surface of liner plates and ball mill castings.

[0010] Therefore, the present invention provides a casting method for rare earth metal ceramic composite castings and its application, and its specific technical effects are as follows: (1) The casting method of the rare earth metal ceramic composite casting provided by the present invention is that the raw materials in the rare earth metal ceramic react to form TiC-TiB2 metal ceramic by pouring molten metal; the rare earth metal ceramic has excellent wettability with the iron-based casting liquid, and the rare earth metal ceramic is cast and infiltrated into the surface and the interior of the casting, so that the two are closely connected, the transition is natural, the structure is stable, and the strength is high, thereby improving the wear resistance of the casting surface, extending the service life, reducing the number of casting replacements, and reducing the cost of use; (2) The casting method of the rare earth metal ceramic composite casting provided by the present invention is simple and easy to operate, and can be used for casting castings with high requirements for wear resistance and abrasion resistance, such as ball mills and liner plates. It does not require high temperature and high pressure, has low requirements for equipment, and is easy to industrialize. DETAILED DESCRIPTION

[0011] The technical solution of the present invention is further illustrated by the following embodiments.

[0012] In order to make the purpose, technical scheme and advantages of the present application clearer, more thorough and complete, the technical scheme of the present invention is clearly and completely described below by examples. The following detailed description is the description of the embodiments, and is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs.

[0013] The instruments, equipment, reagents and materials used in the examples were all obtained through commercial channels, among which lanthanum-cerium mixed rare earth oxide was purchased from Shandong Desheng New Materials Co., Ltd.

[0014] Embodiment 1 Casting a rare earth metal ceramic composite liner casting, the specific steps are as follows: S1. Prepare rare earth metal ceramic raw materials, accurately weigh 0.2g of lanthanum-cerium mixed rare earth oxide, 20g of carbon powder, 100g of titanium powder, 150g of boron carbide powder, and 729.8g of iron powder. Mix all the components evenly, then add 1200mL of phenolic resin and mix evenly.

[0015] S2. Cut the EPS foam plastic according to the required size of the liner casting, and open a pouring and riser system to obtain a solid model of the liner casting. Apply the mixture of rare earth metal ceramic powder and adhesive prepared in step S1 on the surface of the solid model of the liner casting, wait for the surface to solidify slightly, and repeat the application step to a set thickness.

[0016] S3. After the painting is completed, the solid model of the liner casting is placed in a 50°C drying room for surface drying. After drying, a layer of ordinary lost foam casting paint is applied and dried in a 50°C drying room.

[0017] S4, burying the solid model of the liner casting dried after the treatment in step S3 into the lost foam casting sand box, shaking it, evacuating it, pouring casting water, and obtaining the casting after cooling, performing water toughening treatment on the casting, cutting and removing the pouring and riser system, and obtaining the rare earth metal ceramic composite liner casting.

[0018] Embodiment 2 Casting a rare earth metal ceramic composite high chromium steel liner casting, the specific steps are as follows: S1. Prepare rare earth metal ceramic raw materials, accurately weigh 0.3g lanthanum cerium oxide, 50g carbon powder, 150g titanium powder, 200g boron carbide powder, 599.7g iron powder, mix all the components evenly, then add 1200mL silicone resin and mix evenly.

[0019] S2. Cut the EPS foam plastic according to the required size of the liner casting, and open a pouring and riser system to obtain a solid model of the liner casting. Apply the mixture of rare earth metal ceramic powder and adhesive prepared in step S1 on the surface of the solid model of the liner casting, wait for the surface to solidify slightly, and repeat the application step to a set thickness.

[0020] S3. After the painting is completed, the solid model of the liner casting is placed in a 50°C drying room for surface drying. After drying, a layer of ordinary lost foam casting paint is applied and dried in a 50°C drying room.

[0021] S4, burying the solid model of the liner casting dried after the treatment in step S3 into the lost foam casting sand box, shaking it, evacuating it, pouring high chromium molten steel, and obtaining the casting after cooling, performing water toughening treatment on the casting, cutting and removing the pouring and riser system, and obtaining the rare earth metal ceramic composite high chromium steel liner casting.

[0022] Embodiment 3 Casting a rare earth metal ceramic composite cast iron liner casting, the specific steps are as follows: S1. Prepare rare earth metal ceramic raw materials, accurately weigh 0.5g lanthanum cerium oxide, 100g carbon powder, 300g titanium powder, 300g boron carbide powder, 299.5g iron powder, mix all the components evenly, then add 500mL phenolic resin and 700mL silicone resin and mix evenly.

[0023] S2. Cut the EPS foam plastic according to the required size of the liner casting, and open a pouring and riser system to obtain a solid model of the liner casting. Apply the mixture of rare earth metal ceramic powder and adhesive prepared in step S1 on the surface of the solid model of the liner casting, wait for the surface to solidify slightly, and repeat the application step to a set thickness.

[0024] S3. After the painting is completed, the solid model of the liner casting is placed in a 50°C drying room for surface drying. After drying, a layer of ordinary lost foam casting paint is applied and dried in a 50°C drying room.

[0025] S4, burying the solid model of the liner casting dried after the treatment in step S3 into the lost foam casting sand box, shaking it, evacuating it, pouring high-temperature molten iron, and obtaining the casting after cooling, performing water toughening treatment on the casting, cutting and removing the pouring and riser system, and obtaining the rare earth metal ceramic composite cast iron liner casting.

[0026] Embodiment 4 The hardness and wear resistance of the rare earth metal ceramic composite liner casting cast in Example 1, the rare earth metal ceramic composite high chromium steel liner casting cast in Example 2, and the rare earth metal ceramic composite cast iron liner casting cast in Example 3 are examined. The specific steps are as follows: The hardness of the rare earth metal ceramic composite liner casting cast in Example 1, the rare earth metal ceramic composite high chromium steel liner casting cast in Example 2, and the rare earth metal ceramic composite cast iron liner casting cast in Example 3 were measured using a HMAS-D1000SZ fiber Vickers hardness tester. The results are shown in Table 1.

[0027] Table 1 ;

[0028] The wear resistance test was carried out using the MFT-R4000 electrochemical corrosion friction and wear tester. The parameters were set as follows: high-speed linear reciprocating motion trajectory was selected. The ball is used as the friction pair, the load is 5N, the wear time is 20min, the friction stroke is 10mm, and the fixed frequency is 2Hz. The test results of the rare earth metal ceramic composite castings prepared in Examples 1 to 3 are shown in Table 2.

[0029] Table 2 ;

[0030] Therefore, by using the casting method of the rare earth metal ceramic composite casting provided by the present invention, the cast casting has excellent wear resistance and impact toughness, high overall strength, and can be used for casting castings such as ball mills and liners that have high requirements for wear resistance and abrasion resistance; the casting method of the rare earth metal ceramic composite casting provided is simple and easy to operate, does not require high temperature and high pressure, has low equipment requirements, and is easy to industrialize.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A casting method for a rare earth metal ceramic composite casting, characterized in that: The following steps are involved: S1. Cast the physical model of the required casting according to the needs, and open the pouring and rising system; S2, adding rare earth metal ceramic raw materials to the adhesive, stirring and mixing, and applying on the surface of the solid model of the casting. The thickness of the application is determined according to actual needs, and drying after the application is completed; The rare earth metal ceramic raw material includes the following components by weight: 0.01% to 0.05% of lanthanum cerium rare earth oxide, 0.1% to 10% of carbon powder, 0.5% to 30% of titanium powder, 1% to 50% of boron carbide powder, and 5% to 50% of iron powder; the adhesive is one or two of phenolic resin and silicone resin; the mass volume ratio of the rare earth metal ceramic raw material to the adhesive is 1g:1.2mL; S3, applying ordinary lost foam casting coating on the upper surface of the rare earth metal ceramic raw material, and then drying; S4, burying the dried solid model of the casting in the sand mold, with the pouring system facing upward, vibrating and vacuuming, and pouring molten steel; S5. After cooling, a casting is obtained, and the casting is subjected to water toughening treatment. The pouring and riser system is cut and removed, so as to obtain a rare earth metal ceramic composite casting.

2. The casting method of a rare earth metal ceramic composite casting according to claim 1, characterized in that: In step S1, the solid model of the casting is prepared by using foam plastic, and the foam plastic is selected from one of EPS, STMMA and EPMMA.

3. The casting method of a rare earth metal ceramic composite casting according to claim 1, characterized in that: The drying in steps S2 and S3 is performed at 50-55°C.

4. The casting method of a rare earth metal ceramic composite casting according to claim 1, characterized in that: The castings are liners, grinding balls or other castings.

5. Application of the casting method of the rare earth metal ceramic composite casting as claimed in any one of claims 1 to 4 on the surface of liner plates and ball mill castings.