A method of manufacturing a disposable inner-lining crucible and a disposable inner-lining crucible

Abstract

The application discloses a preparation method of a disposable inner lining crucible, which comprises the following steps: (1) ingredient ball milling: melt quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, water reducing agent, methyl cellulose, a binding agent and water are added into a ball mill for ball milling to obtain a slurry; (2) high-pressure slurry injection forming: the slurry is injected into a microporous resin mold at a pressure of 0.8-1.5 MPa, and after pressure maintaining for 30-40 min, the mold is demolded to obtain a blank; (3) drying: the blank is dried at 50-60 DEG C for 6-10 h, and then the temperature is increased to 80-120 DEG C for drying for 6-10 h; (4) calcining: the blank is calcined at 1100-1300 DEG C for 25-50 h, and the disposable crucible is obtained. The disposable crucible prepared by the preparation method has excellent high-temperature bending strength, high-temperature compressive strength, high-temperature load softening temperature and high-temperature thermal stability, and can meet the requirements of the precision casting industry.

Description

Technical Field

[0001] The invention belongs to the technical field of refractory materials, and in particular relates to a preparation method of a disposable lined crucible and the disposable lined crucible. Background Art

[0002] Crucible is a commonly used tool in the metallurgical industry. It has good thermal stability and can meet the general requirements for casting molten steel. However, for some special precision casting industries, such as aerospace alloy casting, in order to minimize the risk of alloy contamination during the casting process, higher requirements are placed on the high-temperature flexural strength, high-temperature load softening temperature and high-temperature thermal stability of the crucible used for casting. The existing crucible preparation process is ordinary pouring or isostatic pressing. The products manufactured by these processes are easily corroded on the inner wall of the crucible during alloy casting, resulting in the final precision castings failing to meet the quality requirements during alloy casting. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a method for preparing a disposable lined crucible and a disposable lined crucible. The disposable crucible produced by this method has excellent high-temperature flexural strength, high-temperature refraction under load temperature, and high-temperature thermal stability, meeting the requirements of the precision casting industry.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A method for preparing a disposable lined crucible comprises the following steps:

[0006] (1) Ball milling: adding fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducing agent, binder and water into a ball mill and milling to obtain a slurry;

[0007] (2) High-pressure grouting molding: The slurry is injected into a microporous resin mold at a pressure of 0.8-1.5 MPa, and the mold is demoulded after maintaining the pressure for 30-40 minutes to obtain an embryo body;

[0008] (3) Drying: Dry the embryo at 50-60°C for 6-10 hours, then heat to 80-120°C and dry for 6-10 hours;

[0009] (4) Firing: calcining the embryo at 1100-1300° C. for 25-50 h.

[0010] Preferably, the raw materials of the disposable lined crucible include, by weight: 40-60 parts of fused quartz material; 30-40 parts of corundum material; 30-40 parts of aluminum powder; 2-5 parts of kaolin; 0.05-0.3 parts of polyvinyl alcohol; 0.05-0.2 parts of methyl cellulose; 0.01-0.1 parts of water reducer; and 0.1-1.5 parts of binder.

[0011] Preferably, the fused quartz material is a mixture of 50 mesh fused quartz, 100 mesh fused quartz, 150 mesh fused quartz and 200 mesh fused quartz in a mass ratio of (10-15):(10-15):(10-15):(10-15).

[0012] Preferably, the corundum material is a mixture of 200 mesh corundum and 325 mesh corundum in a mass ratio of (15-20): (15-20).

[0013] Preferably, the content of aluminum oxide in the corundum material is above 99%.

[0014] Preferably, the particle size of the aluminum powder is 1000-1500 mesh.

[0015] Preferably, the particle size of the kaolin is 800-1200 mesh.

[0016] Preferably, the binder is a high-purity polysaccharide substance or an aqueous resin.

[0017] Preferably, the water reducer is at least one of sodium lignin sulfonate, sulfonated melamine and sodium polyacrylate.

[0018] Preferably, in step (1), the weight ratio of water, material and balls during the ball milling process is (0.15-0.2):1:(2-3), and the ball milling time is 2-8 hours.

[0019] Preferably, in step (1), the grinding balls used in the ball milling process are composed of high-aluminum balls with a diameter of 10 mm, high-aluminum balls with a diameter of 20 mm and high-aluminum balls with a diameter of 30 mm, and the ratio of high-aluminum balls with a diameter of 10 mm, high-aluminum balls with a diameter of 20 mm and high-aluminum balls with a diameter of 30 mm is 3:4:3.

[0020] Preferably, in step (4), the calcination temperature is 1200-1250° C., and the calcination time is 30-40 h.

[0021] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0022] The beneficial effects of the present invention are:

[0023] The disposable lined crucible of the present invention is essentially different from the traditional crucible when used. When using the traditional crucible, the crucible is placed in a vacuum furnace or a medium frequency furnace, and the contact parts of the crucible and the furnace body are densely packed with furnace lining materials, which can protect the crucible. The disposable lined crucible is placed in an ordinary crucible in a furnace that has been built. There is a gap of several millimeters between the disposable lined crucible and the outer lined crucible (the ordinary crucible in the furnace that has been built). Therefore, the disposable lined crucible needs to have excellent thermal stability, high-temperature flexural strength, high-temperature compressive strength, high-load softening temperature and high-temperature corrosion resistance. Its various performance index requirements are much higher than those of traditional crucibles, so the production process, formula and quality requirements are also higher.

[0024] The disposable lined crucible preparation method of the present invention adopts high-pressure grouting molding and controls specific pressure and firing temperature, so that the final disposable lined crucible has a room-temperature compressive strength of more than 75 MPa, a high-temperature load softening temperature (0.5 MPa) of 1780°C or above, and a high-temperature thermal stability (1300°C, water cooling) of 10 or more hot and cold cycles. It has excellent high-temperature flexural strength, high-temperature load softening temperature and high-temperature thermal stability. When used once, even if the side wall has no external support, it will not crack or the inner wall will peel off, and can meet the high standards of the precision casting industry.

[0025] The disposable lined crucible preparation method of the present invention adopts a microporous resin mold instead of a conventional gypsum mold, which can prevent impurities from being introduced during the preparation process, so that the inner and outer walls of the prepared disposable lined crucible are smoother, without residual large bubbles, and have better appearance quality. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to specific embodiments.

[0027] Example 1:

[0028] A method for preparing a disposable lined crucible comprises the following steps:

[0029] (1) Ball milling of ingredients: melt quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducing agent, binder and water are added into a ball mill for ball milling to obtain a slurry, wherein the water reducing agent is sulfonated melamine, the binder is gum arabic, and the raw materials specifically include, by weight fraction: 50 mesh melt quartz: 10 parts; 100 mesh melt quartz: 10 parts; 150 mesh melt quartz: 10 parts; 200 mesh melt quartz: 10 parts; 200 mesh corundum: 15 parts; 325 mesh corundum: 15 parts; 1000 mesh aluminum powder: 30 parts; 800 mesh kaolin: 2 parts; polyvinyl alcohol 0.05 parts; methyl cellulose: 0.05 parts; water reducing agent: 0.01 parts; binder: 0.1 parts, wherein the content of alumina in the 200 mesh corundum is 99.6%, the content of alumina in the 325 mesh corundum is 99.8%, the weight ratio of water, material and ball during ball milling is 0.15:1:2, the ball milling time is 8h, the grinding balls used during ball milling are composed of high-aluminum balls with a diameter of 10mm, high-aluminum balls with a diameter of 20mm and high-aluminum balls with a diameter of 30mm, and the ratio of high-aluminum balls with a diameter of 10mm, high-aluminum balls with a diameter of 20mm and high-aluminum balls with a diameter of 30mm is 3:4:3;

[0030] (2) High-pressure slurry forming: the slurry is injected into a microporous resin mold at a pressure of 0.8MPa, and after pressure maintaining for 40min, the mold is demolded to obtain a green body;

[0031] (3) Drying: the green body is dried at 50℃ for 10h, and then the temperature is raised to 80℃ for drying for 10h;

[0032] (4) Sintering: the green body is calcined at 1100℃ for 50h, and the disposable inner lining crucible is obtained.

[0033] A disposable inner lining crucible is prepared by the preparation method as described above.

[0034] Example 2:

[0035] A preparation method of a disposable inner lining crucible, comprising the following steps:

[0036] (1) Ball milling: fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, a water reducer, a binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium polyacrylate, the binder is a water-based resin with a high degree of polymerization, and the raw materials specifically include, by weight, 50 mesh fused quartz: 15 parts; 100 mesh fused quartz: 15 parts; 150 mesh fused quartz: 15 parts; 200 mesh fused quartz: 15 parts; 200 mesh corundum: 20 parts; 325 mesh corundum: 20 parts; 1500 mesh aluminum powder: 40 parts; 1200 mesh kaolin: 5 parts; 0.3 parts of polyvinyl alcohol; 0.2 parts of methyl cellulose; 0.1 parts of water reducer; 1.5 parts of binder, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.2:1:3, and the ball milling time is 2 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0037] (2) High-pressure grouting molding: the slurry is injected into a microporous resin mold at a pressure of 1.5 MPa, and the mold is demoulded after maintaining the pressure for 30 minutes to obtain an embryonic body;

[0038] (3) Drying: Dry the embryo at 60°C for 6 hours, then heat to 120°C and dry for 6 hours;

[0039] (4) Firing: calcining the embryo at 1300° C. for 25 h.

[0040] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0041] Example 3:

[0042] A method for preparing a disposable lined crucible comprises the following steps:

[0043] (1) Ball milling of ingredients: melt quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducing agent, binder and water are added into a ball mill for ball milling to obtain a slurry, wherein the water reducing agent is sodium lignosulfonate, the binder is a water-based resin with high polymerization degree, and the raw materials specifically include, by weight fraction: 50 mesh melt quartz: 12 parts; 100 mesh melt quartz: 13 parts; 150 mesh melt quartz: 12 parts; 200 mesh melt quartz: 12 parts; 200 mesh corundum: 18 parts; 325 mesh corundum: 17 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol 0.1 part; methyl cellulose: 0.1 part; water reducing agent: 0.05 part; binder: 0.9 part, wherein the content of aluminum oxide in the 200 mesh corundum is 99.6%, the content of aluminum oxide in the 325 mesh corundum is 99.8%, the weight ratio of water, material and ball during ball milling is 0.18:1:2.5, the ball milling time is 6h, the grinding balls used during ball milling are composed of high-aluminum balls with a diameter of 10mm, high-aluminum balls with a diameter of 20mm and high-aluminum balls with a diameter of 30mm, and the ratio of high-aluminum balls with a diameter of 10mm, high-aluminum balls with a diameter of 20mm and high-aluminum balls with a diameter of 30mm is 3:4:3;

[0044] (2) High-pressure slurry forming: the slurry is injected into a microporous resin mold at a pressure of 1.2MPa, and after pressure maintaining for 35min, the mold is demolded to obtain a green body;

[0045] (3) Drying: the green body is dried at 55℃ for 8h, and then the temperature is raised to 100℃ for drying for 8h;

[0046] (4) Sintering: the green body is calcined at 1200℃ for 30h to obtain a disposable inner lining crucible.

[0047] A disposable inner lining crucible is prepared by the preparation method described above.

[0048] Example 4:

[0049] A preparation method of a disposable inner lining crucible, comprising the following steps:

[0050] (1) Ball milling: Fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, a water reducer, a binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a water-based resin with a high degree of polymerization, and the raw materials include, by weight, 50 mesh fused quartz: 11 parts; 100 mesh fused quartz: 12 parts; 150 mesh fused quartz: 13 parts; 200 mesh fused quartz: 14 parts; 200 mesh corundum: 16 parts; 325 mesh corundum: 18 parts; 1500 mesh aluminum powder: 36 parts; 1200 mesh kaolin: 4 parts; polyvinyl alcohol; 0.2 parts of enol; 0.15 parts of methyl cellulose; 0.05 parts of water reducer; 0.5 parts of binder, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.18:1:2.5, and the ball milling time is 6 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0051] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.2 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0052] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0053] (4) Firing: calcining the embryo at 1200° C. for 30 h.

[0054] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0055] Example 5:

[0056] A method for preparing a disposable lined crucible comprises the following steps:

[0057] (1) Ball milling: Fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a water-based resin with a high degree of polymerization, and the raw materials include, by weight, 50 mesh fused quartz: 13 parts; 100 mesh fused quartz: 14 parts; 150 mesh fused quartz: 11 parts; 200 mesh fused quartz: 12 parts; 200 mesh corundum: 17 parts; 325 mesh corundum: 19 parts; 1500 mesh aluminum powder: 38 parts; 1200 mesh kaolin: 3.5 parts; polyvinyl alcohol; 0.15 parts of enol; 0.12 parts of methyl cellulose; 0.05 parts of water reducer; 0.6 parts of binder, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.18:1:2.5, and the ball milling time is 6 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0058] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.2 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0059] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0060] (4) Firing: calcining the embryo at 1200° C. for 30 h.

[0061] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0062] Example 6: (Compared with Example 3, the fused quartz in the raw material is only 50 mesh fused quartz)

[0063] A method for preparing a disposable lined crucible comprises the following steps:

[0064] (1) Ball milling: Fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a water-based resin with a high degree of polymerization, and the raw materials include, by weight, 50 mesh fused quartz: 49 parts; 200 mesh corundum: 18 parts; 325 mesh corundum: 17 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol: 0.1 parts; methyl cellulose: 0.1 parts; water reducer ... Water: 0.05 parts; binder: 0.9 parts, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.18:1:2.5, and the ball milling time is 6 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0065] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.2 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0066] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0067] (4) Firing: calcining the embryo at 1200° C. for 30 h.

[0068] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0069] Example 7: (Compared with Example 3, the fused quartz in the raw material is only 100 mesh fused quartz)

[0070] A method for preparing a disposable lined crucible comprises the following steps:

[0071] (1) Ball milling: Fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a water-based resin with a high degree of polymerization, and the raw materials include, by weight, 100 mesh fused quartz: 49 parts; 200 mesh corundum: 18 parts; 325 mesh corundum: 17 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol: 0.1 parts; methyl cellulose: 0.1 parts; water reducer ... Water: 0.05 parts; binder: 0.9 parts, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.18:1:2.5, and the ball milling time is 6 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0072] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.2 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0073] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0074] (4) Firing: calcining the embryo at 1200° C. for 30 h.

[0075] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0076] Example 8: (Compared with Example 3, the fused quartz in the raw material is only 150 mesh fused quartz)

[0077] A method for preparing a disposable lined crucible comprises the following steps:

[0078] (1) Ball milling: Fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a water-based resin with a high degree of polymerization, and the raw materials include, by weight, 150 mesh fused quartz: 49 parts; 200 mesh corundum: 18 parts; 325 mesh corundum: 17 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol: 0.1 parts; methyl cellulose: 0.1 parts; water reducer ... Water: 0.05 parts; binder: 0.9 parts, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.18:1:2.5, and the ball milling time is 6 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0079] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.2 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0080] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0081] (4) Firing: calcining the embryo at 1200° C. for 30 h.

[0082] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0083] Example 9: (Compared with Example 3, the fused quartz in the raw material is only 200 mesh fused quartz)

[0084] A method for preparing a disposable lined crucible comprises the following steps:

[0085] (1) Ball milling: Fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a water-based resin with a high degree of polymerization, and the raw materials include, by weight: 200 mesh fused quartz: 49 parts; 200 mesh corundum: 18 parts; 325 mesh corundum: 17 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol: 0.1 parts; methyl cellulose: 0.1 parts; water reducer ... Water: 0.05 parts; binder: 0.9 parts, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.18:1:2.5, and the ball milling time is 6 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0086] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.2 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0087] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0088] (4) Firing: calcining the embryo at 1200° C. for 30 h.

[0089] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0090] Example 10: (Compared with Example 3, the corundum in the raw material is only 200 mesh corundum)

[0091] A method for preparing a disposable lined crucible comprises the following steps:

[0092] (1) Ball milling: fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a high-polymerization water-based resin, and the raw materials are specifically included in parts by weight: 50 mesh fused quartz: 12 parts; 100 mesh fused quartz: 13 parts; 150 mesh fused quartz: 12 parts; 200 mesh fused quartz: 12 parts; 200 mesh corundum: 35 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol 0.1 parts; methyl cellulose: 0.1 parts; water reducing agent: 0.05 parts; binder: 0.9 parts, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and ball in the ball milling process is 0.18:1:2.5, the ball milling time is 6 hours, and the grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0093] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.2 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0094] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0095] (4) Firing: calcining the embryo at 1200° C. for 30 h.

[0096] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0097] Example 11: (Compared with Example 3, the corundum in the raw material is only 325 mesh corundum)

[0098] A method for preparing a disposable lined crucible comprises the following steps:

[0099] (1) Ball milling: fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a high-polymerization water-based resin, and the raw materials include, by weight, 50 mesh fused quartz: 12 parts; 100 mesh fused quartz: 13 parts; 150 mesh fused quartz: 12 parts; 200 mesh fused quartz: 12 parts; 325 mesh corundum: 35 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol 0.1 parts; methyl cellulose: 0.1 parts; water reducing agent: 0.05 parts; binder: 0.9 parts, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and ball in the ball milling process is 0.18:1:2.5, the ball milling time is 6 hours, and the grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0100] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.2 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0101] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0102] (4) Firing: calcining the embryo at 1200° C. for 30 h.

[0103] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0104] Comparative Example 1: (Compared with Example 3, the pressure of high-pressure grouting molding is 0.7 MPa)

[0105] A method for preparing a disposable lined crucible comprises the following steps:

[0106] (1) Ball milling: Fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a water-based resin with a high degree of polymerization, and the raw materials include, by weight, 50 mesh fused quartz: 12 parts; 100 mesh fused quartz: 13 parts; 150 mesh fused quartz: 12 parts; 200 mesh fused quartz: 12 parts; 200 mesh corundum: 18 parts; 325 mesh corundum: 17 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol; 0.1 part of enol; 0.1 part of methyl cellulose; 0.05 part of water reducer; 0.9 part of binder, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.18:1:2.5, and the ball milling time is 6 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0107] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 0.7 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0108] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0109] (4) Firing: calcining the embryo at 1200° C. for 30 h.

[0110] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0111] Comparative Example 2: (Compared with Example 3, the pressure of high-pressure grouting molding is 1.6 MPa)

[0112] A method for preparing a disposable lined crucible comprises the following steps:

[0113] (1) Ball milling: Fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a water-based resin with a high degree of polymerization, and the raw materials include, by weight, 50 mesh fused quartz: 12 parts; 100 mesh fused quartz: 13 parts; 150 mesh fused quartz: 12 parts; 200 mesh fused quartz: 12 parts; 200 mesh corundum: 18 parts; 325 mesh corundum: 17 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol; 0.1 part of enol; 0.1 part of methyl cellulose; 0.05 part of water reducer; 0.9 part of binder, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.18:1:2.5, and the ball milling time is 6 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0114] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.6 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0115] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0116] (4) Firing: calcining the embryo at 1200° C. for 30 h.

[0117] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0118] Comparative Example 3: (Compared with Example 3, the calcination temperature during sintering was 1050°C)

[0119] A method for preparing a disposable lined crucible comprises the following steps:

[0120] (1) Ball milling: Fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a water-based resin with a high degree of polymerization, and the raw materials include, by weight, 50 mesh fused quartz: 12 parts; 100 mesh fused quartz: 13 parts; 150 mesh fused quartz: 12 parts; 200 mesh fused quartz: 12 parts; 200 mesh corundum: 18 parts; 325 mesh corundum: 17 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol; 0.1 part of enol; 0.1 part of methyl cellulose; 0.05 part of water reducer; 0.9 part of binder, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.18:1:2.5, and the ball milling time is 6 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0121] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.2 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0122] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0123] (4) Firing: calcining the embryo at 1050°C for 30 hours to obtain the embryo.

[0124] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0125] Comparative Example 4: (Compared with Example 3, the calcination temperature during sintering was 1350°C)

[0126] A method for preparing a disposable lined crucible comprises the following steps:

[0127] (1) Ball milling: Fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducer, binder and water are added to a ball mill for ball milling to obtain a slurry, wherein the water reducer is sodium lignin sulfonate, the binder is a water-based resin with a high degree of polymerization, and the raw materials include, by weight, 50 mesh fused quartz: 12 parts; 100 mesh fused quartz: 13 parts; 150 mesh fused quartz: 12 parts; 200 mesh fused quartz: 12 parts; 200 mesh corundum: 18 parts; 325 mesh corundum: 17 parts; 1500 mesh aluminum powder: 35 parts; 1200 mesh kaolin: 3 parts; polyvinyl alcohol; 0.1 part of enol; 0.1 part of methyl cellulose; 0.05 part of water reducer; 0.9 part of binder, wherein the content of alumina in 200 mesh corundum is 99.6%, and the content of alumina in 325 mesh corundum is 99.8%. The weight ratio of water, material and balls in the ball milling process is 0.18:1:2.5, and the ball milling time is 6 hours. The grinding balls used in the ball milling process are composed of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm, and the ratio of high-alumina balls with a diameter of 10 mm, high-alumina balls with a diameter of 20 mm and high-alumina balls with a diameter of 30 mm is 3:4:3;

[0128] (2) High-pressure grouting molding: The slurry was injected into a microporous resin mold at a pressure of 1.2 MPa, and the mold was demoulded after maintaining the pressure for 35 minutes to obtain an embryonic body;

[0129] (3) Drying: Dry the embryo at 55°C for 8 h, then heat to 100°C and dry for 8 h;

[0130] (4) Firing: calcining the embryo at 1350°C for 30 hours to obtain the embryo.

[0131] A disposable lined crucible is prepared by the above-mentioned preparation method.

[0132] Test example:

[0133] The room temperature compressive strength, high temperature refraction under load temperature and high temperature thermal stability of the disposable lined crucibles of Examples 1-11 and Comparative Examples 1-4 were tested respectively. The test results are shown in Table 1.

[0134] Table 1: Performance test results

[0135]

[0136]

[0137] As can be seen from Table 1, the disposable lined crucible of the present invention has a room temperature compressive strength of more than 75 MPa, a high temperature load softening temperature (0.5 MPa) of 1780°C and above, and a high temperature thermal stability (1300°C, water cooling) of 10 or more hot and cold cycles. It has excellent high temperature flexural strength, high temperature load softening temperature and high temperature thermal stability, and can meet the requirements of the precision casting industry.

[0138] At the same time, by comparing Example 3 with Examples 6-9, it can be seen that when other conditions are the same, when the fused quartz material is mixed with 50 mesh fused quartz, 100 mesh fused quartz, 150 mesh fused quartz and 200 mesh fused quartz in a mass ratio of (10-15): (10-15): (10-15): (10-15), the disposable lined crucible finally prepared has better high-temperature flexural strength, high-temperature load softening temperature, high-temperature thermal stability and high-temperature compressive strength.

[0139] By comparing Example 3 with Examples 10-11, it can be seen that when other conditions are the same, when the corundum material is mixed with 200 mesh corundum and 325 mesh corundum in a mass ratio of (15-20): (15-20), the disposable lined crucible finally obtained has better high-temperature flexural strength, high-temperature load softening temperature, high-temperature thermal stability and high-temperature compressive strength.

[0140] By comparing Example 3 with Comparative Examples 1-2, it can be seen that the pressure of high-pressure grouting molding has a greater influence on the high-temperature thermal stability of the disposable lined crucible finally obtained. When the pressure of high-pressure grouting molding is 0.8-1.5 MPa, the disposable lined crucible obtained has better high-temperature thermal stability.

[0141] By comparing Example 3 with Comparative Examples 3-4, it can be seen that the calcination temperature during firing has a greater influence on the high-temperature flexural strength of the disposable lined crucible finally obtained. When the calcination temperature is 1100-1300°C, the disposable lined crucible obtained has better compressive strength at room temperature.

[0142] Pouring test: The disposable lined crucibles of Examples 1-11 were used for pouring tests. Specifically, the disposable lined crucible was placed in an outer lined crucible to melt the alloy. There was a gap of 2-5 mm between the inner wall of the outer lined crucible and the outer wall of the disposable lined crucible. After heating to 1700°C and maintaining the temperature for 20 minutes, the liquid alloy in the disposable lined crucible was poured out and cast into shape. The cracking of the disposable lined crucible and the peeling of the inner wall were observed. The test results are shown in Table 2.

[0143] Table 2: Cracking and inner wall peeling of disposable lined crucible

[0144] project Whether it is cracked Is there any peeling on the inner wall? Example 1 No cracking No peeling Example 2 No cracking No peeling Example 3 No cracking No peeling Example 4 No cracking No peeling Example 5 No cracking No peeling Example 6 No cracking No peeling Example 7 No cracking No peeling Example 8 No cracking No peeling Example 9 No cracking No peeling Example 10 No cracking No peeling Example 11 No cracking No peeling

[0145] As can be seen from Table 2, when the disposable lined crucible of the present invention is used, without external support on the side wall, no cracking or inner wall peeling occurs, and it can meet the high standards of the precision casting industry.

[0146] The above embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A method for preparing a disposable lined crucible, characterized in that: The following steps are involved: (1) Ball milling: adding fused quartz material, corundum material, aluminum powder, kaolin, polyvinyl alcohol, methyl cellulose, water reducing agent, binder and water into a ball mill and milling to obtain a slurry; (2) High-pressure grouting molding: The slurry is injected into a microporous resin mold at a pressure of 0.8-1.5 MPa, and the mold is demoulded after maintaining the pressure for 30-40 minutes to obtain an embryonic body; (3) Drying: Dry the embryo at 50-60°C for 6-10 hours, then heat to 80-120°C and dry for 6-10 hours; (4) Firing: calcining the embryo at 1100-1300° C. for 25-50 hours to obtain the disposable lined crucible; the raw materials of the disposable lined crucible include, in parts by weight: Fused quartz material: 40-60 parts; Corundum material: 30-40 parts; Aluminum powder: 30-40 parts; Kaolin: 2-5 parts; Polyvinyl alcohol 0.05-0.3 parts; Methyl cellulose: 0.05-0.2 parts; Water reducing agent: 0.01-0.1 parts; Binder: 0.1-1.5 parts; the fused quartz material is prepared by mixing 50 mesh fused quartz, 100 mesh fused quartz, 150 mesh fused quartz and 200 mesh fused quartz in a mass ratio of (10-15): (10-15): (10-15): (10-15); the corundum material is prepared by mixing 200 mesh corundum and 325 mesh corundum in a mass ratio of (15-20): (15-20).

2. The method for preparing a disposable lined crucible according to claim 1, wherein: The particle size of the aluminum powder is 1000-1500 mesh.

3. The method for preparing a disposable lined crucible according to claim 1, wherein: The particle size of the kaolin is 800-1200 meshes.

4. The method for preparing a disposable lined crucible according to claim 1, wherein: The water reducer is at least one of sodium lignin sulfonate, sulfonated melamine and sodium polyacrylate.

5. The method for preparing a disposable lined crucible according to claim 1, wherein: In step (1), the weight ratio of water, material and balls during the ball milling process is (0.15-0.2):1:(2-3), and the ball milling time is 2-8 hours.

6. The method for preparing a disposable lined crucible according to claim 1, wherein: In step (4), the calcination temperature is 1200-1250° C., and the calcination time is 30-40 hours.

7. A disposable lined crucible, characterized in that: The invention is prepared by the preparation method according to any one of claims 1 to 6.

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