Preparation method of boron nitride ceramic shell for titanium and titanium alloy precision casting

A technology of precision casting and boron nitride, applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of harm to human health, sensitivity to pH value changes, pollution of the environment, etc., and achieve small reaction and stable performance , the effect of high finish

Inactive Publication Date: 2006-12-13
SHANGHAI UNIV
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  • Abstract
  • Description
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Problems solved by technology

The tungsten surface layer melting model shell α must be dewaxed by solvent, which is harmful to human health and also pollutes the environment; in addition, the tungsten surface layer shell is roasted in a reducing atmosphere, and the mold material deposited on the surface of the shell is dewaxed The ash is difficult to burn off, and it is easy to react with liquid titanium during pouring, forming pores on the surface of the casting
Zirconia, yttrium oxide and other oxides that are l

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Process and steps in the present embodiment are as follows:

[0013] (1) Preparation of paint: add binder zirconium diacetate to the finely ground boron nitride powder (its particle size is equivalent to 40μ) passed through a 325 mesh sieve, and stir continuously with a stirrer to control the viscosity of the paint slurry 30S; the weight ratio of boron nitride powder and binder is 3:1;

[0014] (2) Preparation of the mold shell: Dip the wax mold into the prepared coating slurry, wait for a while, let the coating evenly hang on the wax mold, and then remove the sand, that is, evenly remove the boron nitride dry powder on the coating On the wax pattern with the coating on it, after the coating is fully dried and hardened, repeat the process of dipping and removing the sand once; Mullite fine powder, the back coating slurry is coated on the outer layer of the above-mentioned coating wax model, and then sanded with coarser mullite powder; the back coating is repeated 3 tim...

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PUM

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Abstract

The invention relates to a method for preparing boron nitride ceramic molding shell, which is used for titanium and titanium alloy accurate casting. It belongs to field of shaping thermo-stable ceramic molding shell material. The invention comprises following steps: preparing coating slurry with refined boron nitride powder and binding agent zirconium acetate or silica sol according to proportion by weight of 3:1; immersing wax tank into said coating slurry to make slurry be coated on wax mold evenly; spreading sand, spreading boron nitride powder on wax mold; repeating said dip-coating and sand-spreading steps for 1 to 2 times after drying and hardening; preparing slurry with binding agent and mullet powder, back coating with prepared slurry for 3-5 times; drying, demolding, and sintering wax mold with several coating layers under condition of 900-1100 Deg. C and nitrogen; getting boron nitride ceramic molding shell material.

Description

technical field [0001] The invention relates to a method for preparing a boron nitride ceramic shell used for precision casting of titanium and titanium alloys. The invention belongs to the technical field of high-temperature-resistant ceramic formwork material molding technology. Background technique [0002] Titanium and titanium alloys are widely used in the aerospace industry, energy industry, marine transportation industry, and chemical industry due to their low density, high specific strength, and a series of excellent properties such as corrosion resistance. However, titanium and titanium alloys have high chemical activity at high temperatures, and they need to chemically react with various commonly used refractory materials. This requires the refractory materials and binders used in titanium alloy casting to have very high chemical stability. At present, the shells for titanium alloy precision casting that are widely used can be roughly divided into: graphite shell...

Claims

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Application Information

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IPC IPC(8): B22C9/06
Inventor 毛协民李重河沈彬刘宏葆周星朱明蒋留全
Owner SHANGHAI UNIV
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