Method for preparing high-air permeability and high-strength ceramic shell mold for anti-gravity casting

A technology of anti-gravity casting and air permeability, which is applied in the direction of casting molding equipment, molds, mold components, etc., and can solve the problem of air permeability reduction

Active Publication Date: 2010-12-29
BEIJING CISRI GAONA TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, increasing the density or thickness of the ceramic shell will lead to a decrease in air permeability

Method used

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  • Method for preparing high-air permeability and high-strength ceramic shell mold for anti-gravity casting
  • Method for preparing high-air permeability and high-strength ceramic shell mold for anti-gravity casting
  • Method for preparing high-air permeability and high-strength ceramic shell mold for anti-gravity casting

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[0021] In the constant temperature and humidity room (temperature 22 ℃, relative humidity 60%), measure the required silica sol according to the back layer slurry ratio given in Table 1, pour it into the back layer paint bucket, rotate the back layer paint bucket, The coal gangue powder is then added to the back coat paint bucket. Stir the slurry with a shovel to disperse the dough, then add 3% edible dextrin by weight of the slurry and stir evenly, then mechanically stir for 1 hour as a back coat coating. Immerse the module in the slurry, let the module and the slurry fully wet, then take it out, rotate the hand-held module continuously, control the excess slurry on the module, and then sprinkle the gangue sand. The 1st and 2nd layers of the back layer are made of 30-60 mesh fine sand, and each layer of paint is dried for 24 hours. After the second layer of back coating, the module is wound with a temperature-resistant carbon fiber rope with a specification of 12K-24K / strand...

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Abstract

The invention discloses a method for preparing a high-air permeability and high-strength ceramic shell mold for anti-gravity casting, and belongs to the field of investment casting. The method comprises the following steps of: preparing back coating slurry, and back-coating a first layer of coating and a second layer of coating; adding a temperature-resistant carbon fiber rope: drying the second back coating for 20 to 24 hours, and winding the temperature-resistant carbon fiber rope in the specification of 12-24K / strand and with the monofilament diameter of 6 mu m at intervals of 1 to 3mm; coating a third back coating and a subsequent back coating on the shell mold until the sixth layer or seventh layer, and after all back coating is coated, dewaxing and roasting a module to prepare the ceramic shell mold. The method has the advantages that: the air permeability and the strength of the ceramic shell mold reach the expected level; and anti-gravity casting experiments by using the shell mold prove that 70 percent of TiAl alloy turbocharger turbine wheels have complete mold-filling.

Description

technical field [0001] The invention belongs to the technical field of investment precision casting, and in particular provides a method for preparing a high-permeability and high-strength ceramic shell for anti-gravity casting. Background technique [0002] Titanium-aluminum alloy is a lightweight new high-temperature material (3.9g / cm 3 ), used in automotive engine supercharger turbine castings can improve the acceleration performance of the engine and improve combustion efficiency due to the weight reduction of components. However, the low density of titanium-aluminum alloy is not conducive to casting, and its solidification range is narrow, and the melt fluidity is poor, so it needs to be formed by special casting method. Japan's Daido Steel Works Co., Ltd. has developed a titanium-aluminum alloy supercharger turbine for vehicles by using the anti-gravity casting method, and it has successfully entered commercial applications (Toshimitsu Tetsui. Mater Sci Eng [J], 2002,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
Inventor 李胜王新英朱春雷张继
Owner BEIJING CISRI GAONA TECH
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