Preparation method of a hollow ceramic flow control rod capable of online heating for aluminum casting

Abstract

The present invention relates to the technical field of aluminum casting production equipment, specifically a preparation method of a hollow ceramic flow control rod that can be heated online for aluminum casting, comprising the following preparation steps: S1: selecting ceramic fiber fabric as the main material, and using an aqueous ceramic slurry containing an inorganic sol binder to fully soak the above-mentioned ceramic fiber fabric; S2: after the ceramic fiber fabric is fully soaked by the inorganic sol, a hand-layup molding process is adopted to roll a ceramic fiber blanket or ceramic fiber felt onto a rod-shaped mold, and the excess slurry is squeezed out by a roller rolling method; S3: the rolled ceramic fiber fabric is tightened with an outer mold of a corresponding shape, and is cured at room temperature for 2-10 hours, and then sent into a heating box for heat treatment. After the heating box is cooled, the mold is taken out and the mold is opened. The ceramic control rod is prepared. The present invention is made into a hollow structure by rolling the ceramic fiber fabric onto a rod-shaped mold after it is fully soaked by the inorganic sol, and is quickly heated by the inside during heating.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum smelting and casting production equipment, and in particular to a method for preparing a hollow ceramic flow control rod which can be heated online for aluminum smelting and casting. Background Art

[0002] In the high-end aluminum casting production process, the aluminum alloy melt has a low density and a high kinematic viscosity, so the flow performance of the aluminum alloy melt is very poor. Generally, the method of increasing the superheat of the aluminum alloy melt is used to solve this problem. The flow rate of the aluminum liquid needs to be controlled to ensure the smooth crystallization and successful casting of the aluminum alloy ingot. One of the key core components for controlling the flow rate and flow of the aluminum melt is the ceramic flow control rod / rod or ceramic stopper rod. Currently, most ceramic flow control rods on the market are made of solid materials, which affects the heating and stirring efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for preparing a hollow ceramic flow control rod that can be heated online for aluminum casting. The rod is composed of a three-dimensional woven ceramic material. Unlike traditional ceramic flow control rods, the rod adopts a hollow structure. One end of the flow control rod is open, and the other end is sealed by a high-density ceramic plug, which is firmly bonded to one end of the flow control rod to form a tubular structure with a blind end.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a method for preparing a hollow ceramic flow control rod capable of online heating for aluminum casting, comprising the following preparation steps:

[0005] S1: selecting ceramic fiber fabric as the main material and fully soaking the ceramic fiber fabric in an aqueous ceramic slurry containing an inorganic sol binder;

[0006] S2: After the ceramic fiber fabric is fully soaked in the inorganic sol, the hand lay-up process is used to roll the ceramic fiber blanket or ceramic fiber felt onto a rod-shaped mold, and the excess slurry is squeezed out by rolling;

[0007] S3: The rolled ceramic fiber fabric is clamped with an outer mold of corresponding shape, and is cured at room temperature for 2-10 hours. It is then placed in a heating box for heat treatment. After the heating box cools down, the mold is taken out and opened. The ceramic control rod is then prepared.

[0008] Preferably, the heating method inside the heating box is as follows:

[0009] Heat to 60℃ in 1-3h, keep at 60℃ for 0.5-6h,

[0010] Heat to 80℃ for 0.5h-3h, keep at 80℃ for 0.5-10h,

[0011] Heat from 80℃ to 100℃ for 0.5h-5h, keep at 100℃ for 0.5-10h,

[0012] Heat from 100℃ to 110℃ for 0.5-5h, keep at 110℃ for 5-10h,

[0013] The temperature is raised from 110°C to 300°C in 3-10 hours, then raised from 300°C to 500°C in 3-10 hours, kept at 500°C for 2-8 hours, then stopped heating and allowed to cool naturally to complete the heating process in the heating box.

[0014] Preferably, the ceramic fiber fabric is aluminum silicate fiber, zirconium-containing aluminum silicate fiber, polycrystalline mullite fiber, alumina fiber, high silica fiber or quartz fiber.

[0015] Preferably, the ceramic fiber fabric is a thin fiber needle-punched blanket or fiber felt with a thickness of 3mm-5mm.

[0016] Preferably, the aqueous inorganic sol binder is one or more of silica sol, aluminum sol, dihydroxyaluminum phosphate, and water glass.

[0017] Preferably, the ceramic slurry raw material is one or more of alumina, silicon oxide, boron nitride, silicon carbide, silicon nitride, and kaolin.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The preparation method of the online-heatable hollow ceramic flow control rod for aluminum casting comprises the following steps: first, ceramic fiber fabric is fully soaked in inorganic sol, and then a hand lay-up process is adopted and the fabric is rolled onto a rod-shaped mold to form a hollow structure, so that the interior can be quickly heated during heating. The preparation method has simple procedures and is easy to operate, thereby reducing production costs and improving work efficiency. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] An embodiment of the present invention provides a method for preparing a hollow ceramic flow control rod capable of online heating for aluminum casting, comprising the following preparation steps:

[0022] S1: selecting ceramic fiber fabric as the main material and fully soaking the ceramic fiber fabric in an aqueous ceramic slurry containing an inorganic sol binder;

[0023] S2: After the ceramic fiber fabric is fully soaked in the inorganic sol, the hand lay-up process is used to roll the ceramic fiber blanket or ceramic fiber felt onto a rod-shaped mold, and the excess slurry is squeezed out by rolling;

[0024] S3: The rolled ceramic fiber fabric is clamped with an outer mold of corresponding shape, and is cured at room temperature for 2-10 hours. It is then placed in a heating box for heat treatment. After the heating box cools down, the mold is taken out and opened. The ceramic control rod is then prepared.

[0025] The heating method inside the heating box is as follows:

[0026] Heat to 60℃ in 1-3h, keep at 60℃ for 0.5-6h,

[0027] Heat to 80℃ for 0.5h-3h, keep at 80℃ for 0.5-10h,

[0028] Heat from 80℃ to 100℃ for 0.5h-5h, keep at 100℃ for 0.5-10h,

[0029] Heat from 100℃ to 110℃ for 0.5-5h, keep at 110℃ for 5-10h,

[0030] The temperature is raised from 110°C to 300°C in 3-10 hours, then raised from 300°C to 500°C in 3-10 hours, kept at 500°C for 2-8 hours, then stopped heating and allowed to cool naturally to complete the heating process in the heating box.

[0031] As a further embodiment of the present invention, the ceramic fiber fabric is aluminum silicate fiber, zirconium-containing aluminum silicate fiber, polycrystalline mullite fiber, alumina fiber, high silica fiber or quartz fiber.

[0032] As a further embodiment of the present invention, the ceramic fiber fabric is a fiber needle-punched thin blanket or fiber felt with a thickness of 3mm-5mm.

[0033] As a further step of the present invention, the aqueous inorganic sol binder is one or more of silica sol, aluminum sol, dihydroxyaluminum phosphate, water glass,

[0034] As a further embodiment of the present invention, the ceramic slurry raw material is one or more of aluminum oxide, silicon oxide, boron nitride, silicon carbide, silicon nitride, and kaolin.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A method for preparing a hollow ceramic flow control rod capable of online heating for aluminum casting, characterized in that: The method comprises the following preparation steps: S1: selecting ceramic fiber fabric as the main material and fully soaking the ceramic fiber fabric in an aqueous ceramic slurry containing an inorganic sol binder; S2: After the ceramic fiber fabric is fully soaked in the inorganic sol, the hand lay-up process is used to roll the ceramic fiber fabric onto a rod-shaped mold, and the excess slurry is squeezed out by rolling; S3: The rolled ceramic fiber fabric is clamped with an outer mold of corresponding shape, and is cured at room temperature for 2-10 hours. It is then placed in a heating box for heat treatment. After the heating box cools down, the mold is taken out and opened. The ceramic control rod is then prepared.

2. The method for preparing a hollow ceramic flow control rod capable of online heating for aluminum casting according to claim 1, characterized in that: The heating method inside the heating box is as follows: Heat to 60℃ in 1-3h, keep at 60℃ for 0.5-6h, Heat to 80℃ for 0.5h-3h, keep at 80℃ for 0.5-10h, Heat from 80℃ to 100℃ for 0.5h-5h, keep at 100℃ for 0.5-10h, Heat from 100℃ to 110℃ for 0.5-5h, keep at 110℃ for 5-10h, The temperature is raised from 110°C to 300°C in 3-10 hours, then raised from 300°C to 500°C in 3-10 hours, kept at 500°C for 2-8 hours, then stopped heating and allowed to cool naturally to complete the heating process in the heating box.

3. The method for preparing a hollow ceramic flow control rod capable of online heating for aluminum casting according to claim 2, characterized in that: The fibers of the ceramic fiber fabric are aluminum silicate fibers, zirconium-containing aluminum silicate fibers, polycrystalline mullite fibers, alumina fibers, high-silica fibers or quartz fibers.

4. The method for preparing a hollow ceramic flow control rod capable of online heating for aluminum casting according to claim 3, characterized in that: The ceramic fiber fabric is a thin fiber needle-punched blanket or fiber felt with a thickness of 3mm-5mm.

5. The method for preparing a hollow ceramic flow control rod capable of online heating for aluminum casting according to claim 4, characterized in that: The inorganic sol binder is one or more of silica sol, aluminum sol, dihydroxyaluminum phosphate, and water glass.

6. The method for preparing a hollow ceramic flow control rod capable of online heating for aluminum casting according to claim 1, characterized in that: The raw materials of the water-based ceramic slurry are one or more of aluminum oxide, silicon oxide, boron nitride, silicon carbide, silicon nitride and kaolin.