Method for preparing shell primary layer coating for titanium alloy precision investment casting

A technology of investment precision casting and titanium alloy, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of complex preparation process control and short service life of surface coatings, and achieve simplified process control and weakened hydration The effect of increasing the strength of the shell

Inactive Publication Date: 2015-09-23
HEBEI GANGYAN DEKAI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of shell surface coating for titanium alloy investment precision casting, to solve the problem that when yttrium oxide is used as the shell surface refractory material, it is easy to gel due to hydration, and the life of the surface coating is short. Preparation process control complex issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation steps of the mold shell surface coating for the titanium alloy investment precision casting of the present embodiment are as follows:

[0017] 1. Pretreatment of surface layer refractories: fused yttrium oxide powder is sieved through 250-mesh and 325-mesh sieves to obtain coarse powder (between 250 and 325 mesh) and fine powder (fine than 325 mesh). The fine powder weight ratio is 3:2 preparation, obtains surface layer refractory material powder;

[0018] 2. Prepare composite binder: prepare 50% acetic acid solution with pure acetic acid and distilled water at a mass ratio of 1:1, then mix it with zirconium acetate binder at a mass ratio of 1:1, stir well and add Mix an equal volume of absolute ethanol and stir for 20 minutes to obtain a composite binder;

[0019] 3. Prepare the surface coating: add 1mL of aerosol OT and 0.8mL of n-octanol to the composite binder prepared in step 2 per kilogram, then add 2.5kg of yttrium oxide powder pretreated in step...

Embodiment 2

[0022] Embodiment 2 is basically the same as Embodiment 1, except that in the refractory pretreatment process, the ratio of coarse powder to fine powder is 3:2.5; in the process of preparing the composite binder, the organic acid used It is citric acid, and the mass ratio of acid solution and zirconium acetate is 1:1, and stirs for 15 minutes; in the process of preparing the surface coating, add 1.5mL of aerosol OT and 1.2mL of n-octanol per kilogram of binder, Then add 3 kg of yttrium oxide powder, and stir for 4 hours to prepare the surface coating.

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Abstract

The invention discloses a method for preparing a shell primary layer coating for titanium alloy precision investment casting. The method includes the steps that electric melting yttrium oxide powder with a certain coarse and fine powder ratio is obtained through preprocessing of primary layer fireproof materials, a compound binding agent is prepared from organic acid, an inert organic solvent and acetic acid zirconium, and finally the primary layer coating is prepared. According to the method for preparing the shell primary layer coating for titanium alloy precision investment casting, the specific surface area of the yttrium oxide powder is reduced, organic acid and yttrium oxide can generate hydroxide of yttrium salt, the hydration of yttrium oxide is weakened, and the function of the high-temperature binding agent is achieved; viscosity is adjusted regularly, volatilization is reduced regularly, and stability of the coating is kept. The performance of the primary layer coating prepared through the method is stable and can be prolonged for 20 days, the temperature of the coating is 20+ / -5 DEG C, and therefore preparing and preserving can be conducted in a common constant-temperature and constant-humidity environment, and the coating preparing and preserving technology control is simplified.

Description

technical field [0001] The invention belongs to the technical field of alloy investment precision casting, and in particular relates to a method for preparing a mold shell surface coating for titanium alloy investment precision casting. Background technique [0002] Titanium alloy has a series of excellent properties such as low density, high specific strength, corrosion resistance, and good biocompatibility, and is widely used in aerospace, ocean transportation, energy, chemical, medical and health industries. Titanium alloy investment casting is a near-net shape process, which can greatly reduce production costs and shorten the manufacturing period compared with traditional machining. But titanium is a highly chemically active metal that reacts with almost all known refractory materials in the molten state. This requires that the refractory materials and binders for titanium alloy casting have very high chemical stability, so as to weaken the chemical reaction between the...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 杨武强邵冲朱小平
Owner HEBEI GANGYAN DEKAI TECH CO LTD
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