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Process method for preparing high-temperature alloy miniature precision casting part

A technology for precision castings and superalloys, applied in the field of high-temperature alloy precision casting and high-temperature alloys, can solve the problems of poor filling ability and poor fluidity of alloys, and achieve the effect of ensuring integrity and good filling performance

Inactive Publication Date: 2009-10-07
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of alloy is usually used in large-scale castings. Due to the difficulties in shell making, poor alloy fluidity, and poor filling ability, it is rarely used in micro-investment casting. Therefore, it is necessary to develop a new process to make it possible to prepare superalloy miniature parts

Method used

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  • Process method for preparing high-temperature alloy miniature precision casting part
  • Process method for preparing high-temperature alloy miniature precision casting part
  • Process method for preparing high-temperature alloy miniature precision casting part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First prepare the surface coating in the coating room 1. The surface coating is made of aluminum oxide, the powder particle size is 300 / 400 mesh, the binder is silica sol, and the mixer 5 is started to make the density of the coating uniform and try not to get involved. Air; fix the combined wax pattern in the dipping chamber 2, cover the end cover of the dipping chamber, close the paint discharge valve 9, vacuum degree control valve 6, spare valve 12, start the vacuum pump 4, and wait until the vacuum degree reaches 0.02MPa , turn off the vacuum pump 4, close the vacuum gauge 11 and the vacuum control valve 6; open the paint valve 3, so that the paint is sucked into the dipping chamber 2 under vacuum conditions, and when the paint enters 2 / 3 of the volume of the dipping chamber, close the paint Valve 3, keep it for 2 minutes, open the vacuum control valve 6 to deflate, when the pressure of the dipping chamber reaches normal pressure, open the end cover of the dipping ch...

Embodiment 2

[0029] First prepare the surface coating in the coating room 1. The surface coating is made of aluminum oxide, the powder particle size is 300 / 400 mesh, the binder is silica sol, and the mixer 5 is started to make the density of the coating uniform and try not to get involved. Air; fix the assembled wax pattern in the dipping chamber 2, cover the end cover of the dipping chamber 2, close the paint discharge valve 9, the vacuum degree control valve 6, the spare valve 12, start the vacuum pump 4, and wait until the vacuum degree reaches 0.01 MPa, close the vacuum pump 4, close the vacuum gauge 11 and the vacuum degree control valve 6; open the paint valve 3, so that the paint is sucked into the dipping chamber 2 under vacuum conditions, and close when the paint enters 2 / 3 of the volume of the dipping chamber. Paint valve 3, after holding for 2 minutes, open the vacuum control valve 6 to deflate, when the pressure of the dipping chamber 2 reaches normal pressure, open the end cove...

Embodiment 3

[0031]First prepare the surface coating in the coating room 1. The surface coating is made of aluminum oxide, the powder particle size is 400 / 600 mesh, the binder is silica sol, and the mixer 5 is started to make the density of the coating uniform and try not to get involved. Air; fix the combined wax pattern in the dipping chamber 2, cover the end cover of the dipping chamber, close the paint discharge valve 9, vacuum degree control valve 6, spare valve 12, start the vacuum pump 4, and wait until the vacuum degree reaches 0.03MPa , close the vacuum pump 4, close the vacuum gauge 11 and the vacuum degree control valve 6; open the paint control valve 3, so that the paint is sucked into the dipping chamber 2 under vacuum conditions, and when the paint enters 2 / 3 of the volume of the dipping chamber, close Paint valve 3, after holding for 2 minutes, open the vacuum control valve 6 to deflate, when the pressure of the dipping chamber 2 reaches normal pressure, open the end cover of...

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Abstract

The invention relates to a process method for preparing a high-temperature alloy miniature precision casting part. The method comprises the following steps: preparing a wax model or a resin type model after waxing processing of the miniature precision casting part, then, placing the wax model or the resin type model after waxing processing in a dip-coating chamber, taking the silicon-dioxide-based or the alumina-based coating as the surface layer coating, performing vacuum dipcoating, drying in the room temperature air, and then sealing slurry, drying, dewaxing and burning after the conventional coating working procedure to obtain a formwork; then putting the formwork preheated at the high temperature in a casting chamber of a vacuum melting furnace for casting to obtain a miniature casting part with a formwork; and finally, putting the miniature casting part with the formwork in a formwork removal device for formwork removal and post processing to obtain a finished product. The invention has the advantages that the formwork of the miniature casing part can be easily prepared by adopting a vacuum dipcoating process and an additional conventional coating process, and the casting part has good filling capacity; the integrality of the casting part can be ensured by removing the formwork by a chemical method; and the miniature casting parts can be prepared at a large scale.

Description

technical field [0001] The invention belongs to the field of high-temperature alloys, in particular to the field of precision casting of high-temperature alloys. Background technique [0002] Micromachines are widely used in various aspects such as aerospace, navigation, bioengineering, national defense, chemical industry, health care, electronics, and robots. The development of this field will greatly affect the future life of human beings. All countries in the world have paid great attention to this field, and have continuously made new progress. Various new micro-fabrication processes have emerged, such as high-energy beam etching technology, ultra-precision machining technology, micro-EDM technology and so on. In recent years, Germany has adopted the micro-precision casting process to manufacture metal microstructures whose overall size is on the micron scale or with micron-scale microstructures, which are mainly used in the fields of surgical instruments and biotechnolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
Inventor 毛萍莉姜卫国胡壮麒
Owner SHENYANG POLYTECHNIC UNIV
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