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Problems solved by technology
Therefore, the different shrinkage rates of various parts of the casting during the mold design will make the mold design extremely complicated, resulting in the disadvantage that the dimensional accuracy is not easy to control; The surface of the shell is rough, especially in the field of large-scale thin-walled castings of high-temperature alloys, which affects the surface quality of the castings and makes it difficult to clean the castings. Since the impurities on the surface of the shell cannot be removed, the secondary roasting of the shell can easily cause the shell to crack and cannot be recycled. Utilization, increased manufacturing cost
Method used
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Examples
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Effect test
Embodiment 1
[0023] Prepare the mold shell of the guide vane casting of K438 superalloy, specifically comprise the following steps:
[0024] A. Dry the surface of the wax pattern module after degreasing;
[0025] B. Prepare the shell surface layer slurry, mix according to the weight ratio of 15% of silica sol, 75% of zircon powder with a particle size of 300 mesh to 1250 mesh, and then add cobalt aluminate accounting for 7% by weight. 0.5% wetting agent, this wetting agent is the mixture of polyoxyethylene ether concentrate and carboxymethyl cellulose, the mass ratio of polyoxyethylene ether and carboxymethyl cellulose in this wetting agent is 6:4; Add 0.5% n-butanol by weight (other embodiments can be at least one of n-octanol, polydimethylsiloxane or ethylene glycol butyl ether phosphate) as a defoamer, and add 1.0% by weight % of distilled water, adding a strengthening agent accounting for 1.0% by weight, the strengthening agent is a mixture of styrene-butadiene latex, acrylic acid, an...
Embodiment 2
[0036] Prepare the shell of the ring-by-ring casting of K4169 superalloy, specifically comprising the following steps:
[0037] A. Dry the surface of the wax pattern module after degreasing;
[0038] B. Prepare the shell surface layer slurry, mix according to the weight ratio of 20% of silica sol, 70% of zircon powder with a particle size of 300 mesh to 1250 mesh, and then add cobalt aluminate accounting for 7% by weight, adding 0.5% wetting agent, the wetting agent is a mixture of polyoxyethylene ether concentrate and carboxymethyl cellulose, the mass percentage of polyoxyethylene ether and carboxymethyl cellulose is 6:4; adding accounted for 0.5% by weight % n-butanol (other embodiments can be at least one of n-octanol, polydimethylsiloxane or ethylene glycol butyl ether phosphate) as a defoamer, adding 1.0% by weight of distilled water, adding The strengthening agent accounting for 1.0% by weight, the strengthening agent is a mixture of styrene-butadiene latex, acrylic aci...
Embodiment 3
[0049] Prepare the mold shell of the nozzle ring casting of K403 superalloy, specifically comprise the following steps:
[0050] A. Dry the surface of the wax pattern module after degreasing;
[0051] B. Prepare the shell surface layer slurry, mix according to the weight ratio of 15% of silica sol, 73% of zircon powder with a particle size of 300 mesh to 1250 mesh, and then add cobalt aluminate accounting for 10% by weight, adding 0.25% wetting agent, the wetting agent is a mixture of polyoxyethylene ether concentrate and carboxymethyl cellulose, the mass percentage of polyoxyethylene ether and carboxymethyl cellulose is 8:2; adding accounted for 0.25% by weight % n-butanol (other embodiments can be at least one of n-octanol, polydimethylsiloxane or ethylene glycol butyl ether phosphate) as a defoamer, add 1% distilled water by weight, add The strengthening agent accounting for 0.5% by weight, the strengthening agent is a mixture of styrene-butadiene latex, acrylic acid, and ...
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Abstract
The invention relates to a shell of a ring-in-ring casting of K4169 high-temperature alloy. The shell comprises a shell surface layer and a multi-layer type shell back layer. The shell surface layer is formed by shell surface layer slurry and surface layer stuccoing materials in a solidification combination manner. The grain size of zircon powder for preparing the slurry as in the shell surface layer slurry ranges from 300 meshes to 1, 250 meshes. The aggregate of a surface layer stuccoing layer is the zircon powder, and the grain size of the aggregate ranges from 100 meshes to 150 meshes. Theshell back layer is formed by shell back layer slurry and back layer stuccoing materials in a solidification combination manner. The grain size of melted quartz powder and the grain size of melted quartz sand for preparing the slurry as in the shell back layer slurry range from 100 meshes to 1, 250 meshes. The aggregate of the back layer stuccoing layer is the quartz sand with the grain size ranging from 10 meshes to 50 meshes. Because the zircon powder is used as the surface layer slurry of the shell, and the melted quartz with an extremely small expansion coefficient is used as the back layer slurry, the coefficient of thermal expansion of an obtained shell is small, the grain size of used powder is strictly controlled, and the difference between the coefficient of thermal expansion ofthe shell surface layer and the coefficient of thermal expansion of the shell back layer is narrowed down.
Description
technical field [0001] The invention relates to the technical field of investment casting, in particular to a shell of a ring-by-ring casting of a K4169 superalloy. Background technique [0002] With the improvement of energy utilization efficiency, more and more components are designed based on complex aerodynamic principles or fluid dynamics, with complex shapes and high requirements for integrity and precision. Investment casting can cast parts with extremely complex shapes as a whole, so it has become the main method or even the only method for producing complex metal components. Since the investment casting process has the characteristics of long process, many processes, and complex influencing factors, it is not easy to obtain near-net-shape castings. Among the many processes of investment casting, there are three key processes that have a great influence on the size and deformation of castings, namely wax mold preparation, mold shell preparation, and casting solidifi...
Claims
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Application Information
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