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Method for investment precision casting of high-temperature alloy casting

A high-temperature alloy and precision casting technology, applied in the direction of casting mold, casting mold composition, casting molding equipment, etc., can solve the problem of difficult to repair metal nodule products, etc., to solve the problem of interface reaction, excellent thermal stability and chemical stability , smooth surface effect

Pending Publication Date: 2022-04-15
CSIC NO 12 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for precision investment casting of superalloy castings, which solves the problem that the surface of superalloy castings prepared by the existing investment casting method has metal nodules that are difficult to repair

Method used

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  • Method for investment precision casting of high-temperature alloy casting
  • Method for investment precision casting of high-temperature alloy casting
  • Method for investment precision casting of high-temperature alloy casting

Examples

Experimental program
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Embodiment 1

[0030] Prepare a kind of investment casting precision casting K648 superalloy casting, this casting is a gas turbine insert class casting, such as figure 1 As shown, its shape is arc-shaped sheet, the casting size is 120×35mm, and the overall wall thickness is 2mm, which cannot be realized by ordinary sand casting. Investment casting is used. During the mold making process, the complex inner cavity of the part cannot be core-pulled. Therefore, an arch bridge-shaped ceramic core is designed, such as figure 2 shown.

[0031] The preparation method of the K648 superalloy superalloy casting by investment casting precision casting comprises the following steps:

[0032] Step 1, put cobalt aluminate powder and silica sol with a mass ratio of 1:9 in a container, stir with a stirrer, the stirrer speed is 480r / min, and the stirring time is 3h, so that the mixture is uniform, and the ceramic is obtained core pretreatment agent;

[0033] Step 2, evenly spray the ceramic core pretreat...

Embodiment 2

[0043] A method for precision investment casting K648 superalloy casting, comprising the following steps:

[0044] Step 1, put cobalt aluminate powder and silica sol with a mass ratio of 1:9 in a container, stir with a stirrer, the stirrer speed is 500r / min, and the stirring time is 2.5h, so that the mixture is uniform, and the obtained Ceramic core pretreatment agent;

[0045] Step 2, spray the ceramic core pretreatment agent evenly on the surface of the ceramic core, dry, then spray and dry to ensure that the coating is uniform and free of flow marks;

[0046] Step 3: Put the ceramic core into the wax mold, and prepare the overall wax mold of the ceramic core by using medium-temperature wax press wax. The wax temperature is 50°C, and the wax injection pressure is 30Kg / cm 2 , the pressure holding time is 25s, and the air cooling is 8h, that is, the overall wax mold of the ceramic core is made, and the surface is repaired until there are no defects such as bubbles, shrinkage, b...

Embodiment 3

[0051] A method for precision investment casting K648 superalloy casting, comprising the following steps:

[0052] Step 1, put cobalt aluminate powder and silica sol with a mass ratio of 1:9 in a container, stir with a stirrer, the speed of the stirrer is 600r / min, and the stirring time is 1.5h, so that the mixture is uniform, and the obtained Ceramic core pretreatment agent;

[0053] Step 2, spray the ceramic core pretreatment agent evenly on the surface of the ceramic core, dry, then spray and dry to ensure that the coating is uniform and free of flow marks;

[0054] Step 3: Put the ceramic core into the wax mold, and prepare the overall wax mold of the ceramic core by using medium-temperature wax press wax. The wax temperature is 60°C, and the wax injection pressure is 40Kg / cm 2 , the pressure holding time is 15s, and the air cooling is 5h, that is, the overall wax mold of the ceramic core is made, and the surface is repaired until there are no defects such as bubbles, shr...

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Abstract

The invention discloses a method for investment precision casting of a high-temperature alloy casting, which comprises the following steps of: uniformly mixing cobalt aluminate powder and silica sol to prepare a ceramic core pretreating agent, uniformly spraying the pretreating agent on the surface of a ceramic core, airing, putting the ceramic core into a wax mould, preparing a ceramic core integral wax mould, and carrying out mold casting on the ceramic core integral wax mould to obtain the high-temperature alloy casting. The method comprises the following steps: preparing a mold shell on the surface of a ceramic core integral wax mold, adopting silica sol-zircon sand powder as a surface layer, adopting silica sol-zircon sand powder as other layers, carrying out dewaxing treatment on the prepared mold shell, charging and roasting to form a ceramic mold shell, putting a high-temperature alloy into a vacuum melting furnace to melt into melt, pouring the melt into the ceramic mold shell in a vacuum manner, and cooling a casting in the furnace for 5-7 minutes to obtain a finished product. And taking out and putting into a sand tray until the sand tray is completely cooled to obtain the investment precision casting high-temperature alloy casting. The cobalt aluminate and silica sol coating is formed on the working surface of the ceramic core, so that the interface reaction problem of the ceramic core and a high-temperature alloy melt is solved, and the generation of metal nodule-shaped bulges is avoided.

Description

technical field [0001] The invention belongs to the technical field of investment casting, and relates to a method for precision investment casting of superalloy castings. Background technique [0002] In recent years, cast high-temperature alloys have been widely used in the fields of aero-engines and gas turbines, and are mainly used in hot-end parts of turbine engines. Moreover, with the requirements of engine performance improvement, the structure of high-temperature alloy parts is complex, and the requirements for dimensional accuracy and surface quality are high. They are mostly prepared by investment casting methods. For complex internal airflow cavities, it is difficult to manufacture them by mold core pulling. Ceramic cores are often used instead, and the silicon-based ceramic cores can withstand a temperature of about 1500°C. [0003] In the manufacturing process of K648 superalloy parts, the superalloy melt is prone to interfacial reaction with the silicon-based ...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C9/12B22C3/00B22C7/02B22C9/10
Inventor 高磊马敏团巩红涛王剑张怀章杨小建
Owner CSIC NO 12 RES INST