Method for preparing TiAl-based alloy formwork by precision-investment casting

A technology of investment precision casting and base alloy, which is applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve the problems of slow drying of shell making, long production cycle of castings, high cost, and achieve high hygroscopicity and save production. The effect of high production cycle and moisture absorption speed

Inactive Publication Date: 2009-06-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the problems of slow shell drying, long casting production cycle and high cost in the existing TiAl

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0008] Specific embodiment one: the preparation method of investment casting precision casting TiAl base alloy mold shell of the present embodiment is implemented according to the following steps: one, adopt SolidWorks software to design three-dimensional CAD model, save as STL file after converting with magic software, then STL file The data information is sent to the SLS rapid prototyping machine, the polystyrene powder with a diameter of less than 0.2mm is sintered layer by layer with selective laser sintering technology, and the investment mold is made after dipping in wax, and then the surface and interior of the investment mold are cleaned with industrial alcohol , dry in the air; 2. Add 60-mesh bauxite sand and polyvinyl alcohol 1788 powder into distilled water and stir at a stirring speed of 300-400r / min until the polyvinyl alcohol 1788 powder is evenly wrapped on the surface of the bauxite sand, and then At 60-80°C, dry for 3-4 hours and grind for 1 hour; 3. After mixi...

specific Embodiment approach 2

[0015] Embodiment 2: This embodiment differs from Embodiment 1 in that the stirring speed in step 2 is 320-380 r / min. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment differs from Embodiment 1 in that the stirring speed in step 2 is 350 r / min. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a method for preparing a shuttering for a precision investment casting TiAl-based alloy, and relates to a method for preparing an oxide ceramic shuttering. The method solves the problems of slow drying for making the shuttering, longer production period for cast and high cost during production of a TiAl-based alloy precise cast. The preparation method comprises: firstly, adopting SLS technology to prepare a fusible pattern; secondly, coating polyvinyl alcohol on the surface of bauxite and grinding the bauxite into granules; thirdly, smearing a shuttering surface layer; fourthly, smearing a shuttering back layer; fifthly, removing wax from the shuttering, and roasting the shuttering; and sixthly, casting the TiAl-based alloy in vacuum to obtain the TiAl-based alloy cast. The method only needs 13 to 15 days to obtain the TiAl-based alloy precise cast from CAD design, but the prior method at least needs 45 to 60 days, so the method saves nearly two thirds of production period, and the manufacturing cost is correspondingly lowered.

Description

technical field [0001] The invention relates to a preparation method of an oxide ceramic mold shell. Background technique [0002] Lightweight and high temperature resistant structural materials and their preparation and processing technology are important material basis for the development of aerospace. As the flight speed of new aircraft increases and the flight speed increases, the demand for lightweight high-temperature resistant structural materials for new aircraft is extremely urgent. The TiAl-based alloy has a low density (4g / cm 3 ), high strength (700MPa), high stiffness (20°C, 175GPa; 700°C, 150GPa), high temperature resistance (use temperature up to 750°C) and excellent oxidation resistance (better oxidation resistance below 800°C) , is expected to replace nickel-based superalloys (density 8.7g / cm 3 ) and applied to the manufacture of new aircraft. However, the low room temperature brittleness and difficult processing of TiAl-based alloys are the bottlenecks t...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C7/02B22C3/00
Inventor 陈玉勇陈艳飞田竟肖树龙孔凡涛徐丽娟王惠光刘志光
Owner HARBIN INST OF TECH
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