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Precise forming method for titanium-aluminum intermetallic compounds

An intermetallic compound, precision molding technology, applied in casting molding equipment, molds, mold components, etc., can solve the problems of poor flow ability, difficult plastic processing, poor formability, etc., to achieve high dimensional accuracy, good surface quality, The effect of less internal inclusions

Active Publication Date: 2016-04-20
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Titanium-aluminum alloy has high chemical activity and is very easy to react with the mold shell material to produce a certain thickness of pollution layer on the surface of the casting, which affects the uniformity of the mechanical properties of the casting and deteriorates the quality of the casting.
At the same time, compared with conventional titanium alloys, titanium-aluminum alloys have lower room temperature plasticity, poor fluidity, and higher shrinkage, so defects such as shrinkage porosity, shrinkage cavities, undercasting, and cracks are prone to occur, especially cracking problems, which have become the needs of titanium-aluminum alloy casting molding. key issues to solve
[0004] Titanium-aluminum-based intermetallic compounds have low room temperature plasticity and poor formability, and there are great difficulties in plastic processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0038] 1. Wax mold preparation

[0039] Imported wax KC2683 and automobile engine supercharged turbo metal mold are used, and the injection pressure is 20±2kg / cm 2 , the holding time is 40s. The diameter of the impeller is 80mm, and the wall thickness ranges from 0.8 to 2.5mm. The wax model is repaired, molded, cleaned and so on. The working environment temperature is controlled at 22°C and the relative humidity is controlled at 60%.

[0040] 2. Preparation of shell surface layer and facing layer

[0041] For surface layer preparation, pour the zirconium acetate binder into 325 mesh yttrium oxide refractory powder, the powder-to-liquid ratio is 2:1, stir for 1 hour, and the viscosity is 50 sec. Apply it on the surface of the treated wax model, sprinkle 80-100 mesh yttrium oxide sand, and dry for 48 hours; prepare the facing layer, prepare the facing layer slurry with a powder-to-liquid ratio of 1.3:1, and stir for 40 Minutes, the viscosity is 15 seconds, spread on the dri...

Embodiment example 2

[0051] Implementation Case 2 is basically the same as Implementation Case 1, the differences are:

[0052] The casting is a reduced diffuser case, with a minimum wall thickness of 1.25mm, an overall wall thickness of 1.5-2.5mm, and a diameter of The wax pattern is prepared by laser rapid prototyping. Use 260 mesh yttrium oxide powder and yttrium sol for the surface layer and facing layer slurry, the powder-liquid ratio of the surface layer is 2.2:1, stir for 1.5 hours, the viscosity is 58 seconds, the ambient temperature of the process is controlled at 24°C, and the humidity is 80% , The natural drying time is 36h. The powder-liquid ratio of the back layer is 1.5:1, the stirring time is 1h, the viscosity is 8sec, the total number of back layers is 10 layers, and the natural drying time of each layer is 24h. In the shell roasting process, the maximum temperature is controlled at 1000°C, and the holding time is 4h. The preheating temperature of the mold shell before casting ...

Embodiment example 3

[0054] Implementation Case 3 is basically the same as Implementation Case 1, the difference lies in:

[0055] Choose a diameter of Diffuser case castings with a wall thickness of 1.5-4mm. The wax model is made of photosensitive resin and prepared by laser rapid prototyping technology. Use 260 mesh yttrium oxide powder and silica sol for the surface layer and facing layer slurry, the powder-liquid ratio of the surface layer is 2.5:1, stir for 1.8h, the viscosity is 60sec, the ambient temperature of the process is controlled at 25°C, and the humidity is 65%. The natural drying time is 12h. The powder-liquid ratio of the back layer is 1.3:1, the stirring time is 1h, the viscosity is 7sec, the total number of back layers is 12 layers, the natural drying time of each layer is 12h, the ambient temperature is 26°C, and the relative humidity is 45%. In the shell roasting process, the maximum temperature is controlled at 1050°C, and the holding time is 5h. The preheating temperatur...

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Abstract

The invention relates to a precise forming method for titanium-aluminum intermetallic compounds. According to the method, yttrium oxide powdery sand is selected as a surface-layer refractory to prepare a ceramic shell for investment casting, and in combination with processes such as a vacuum consumable skull furnace or a vacuum induction water-cooling copper crucible furnace and centrifugal casting, a titanium-aluminum intermetallic compound casting is prepared. The ceramic shell prepared according to the forming method is high in inertia, and good in matching between strength and deformability and collapsibility, and is suitable for investment casting of the titanium-aluminum intermetallic compounds; a prepared casting is complete in forming, the smallest wall thickness can reach 1mm, the dimension precision reaches lower than CT7, a surface pollution layer is thin, surface roughness is less than or equal to 6.3 micrometers, and more importantly, cracks cannot be formed, and therefore, the problems that titanium-aluminum alloy is low in room-temperature plasticity and easy to crack during forming are solved. The forming method is applicable to development and engineering production of various structural parts of the titanium-aluminum intermetallic compounds.

Description

technical field [0001] The invention relates to a technology for precision casting of titanium-aluminum intermetallic compounds. The invention belongs to the technical field of molding technology of titanium-aluminum intermetallic compounds. : Titanium-aluminum intermetallic compounds are also called titanium-aluminum-based alloys, including γ-TiAl-based alloys, Ti 3 Al-based alloy or Ti 2 AlNb alloy. Background technique [0002] With the rapid development of aviation, aerospace technology and the automobile industry, the flight distance, flight speed, and flexibility of various new aircrafts have improved, and higher and higher requirements have been put forward for light, high-strength, heat-resistant materials and their precision molding technology. Require. Titanium-aluminum intermetallic compound (also known as titanium-aluminum alloy) is a new type of light-weight, high-temperature structural material with a density less than 50% of that of nickel-based alloys, an...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22D13/00B22D21/00
CPCB22C9/04B22D13/00B22D21/00
Inventor 魏战雷黄东李建崇赵鹏朱郎平南海
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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