Method for preparing titanium alloy mold shell

A titanium alloy and formwork technology, which is applied in the field of casting titanium alloys, can solve problems such as poor stability, low manufacturing precision of titanium alloy formwork, and hazards, and achieve stable performance, avoid high-temperature heat treatment process, and simple process conditions.

Inactive Publication Date: 2018-02-16
BAOJI YONGSHENGTAI TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a titanium alloy formwork, which solves

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0025] A kind of preparation method of titanium alloy mold shell of the present invention, specifically implement according to the following steps:

[0026] Step 1, the preparation of titanium dioxide sol:

[0027] According to the ratio of the molar ratio of the titanium compound to the alcohol of 1:1 to 8, the titanium compound and the alcohol are configured into an alcohol solution of the titanium compound, and the alcohol solution of the titanium compound is added dropwise to nitric acid or nitric acid with a pH of 1.0 to 4.0 while stirring. Hydrolyzed in an aqueous solution of hydrochloric acid and the molar ratio of the titanium compound to the aqueous acid solution is 1:75-90, after reflux at 50-75°C for 6-40 hours, evaporate the resulting sol at 50-55°C to remove the alcohol Class, obtain titanium dioxide sol;

[0028] Wherein, the titanium compound is an organic titanium compound, and the organic titanium compound is tetraethyl titanate, tetra-n-propyl titanate, tetr...

Embodiment 1

[0037] According to the ratio of the molar ratio of titanium compound to alcohol of 1:1, tetraethyl titanate and methanol are configured into an alcohol solution of titanium compound, and the alcohol solution of titanium compound is added dropwise to the aqueous solution of nitric acid with a pH of 1.0 while stirring Hydrolyzed in medium, and the molar ratio of titanium compound and acid aqueous solution is 1:75, after refluxing at 50°C for 6 hours, the obtained sol is evaporated at 50°C to remove alcohols to obtain titanium dioxide sol; the particle size is 200 ~400 mesh boron nitride powder and titanium dioxide sol are configured into a slurry with a flow cup viscosity of 10 seconds in a weight ratio of 2:1; the above slurry is coated and hung on a wax model, and the sanding particle size is 40~100 mesh. Mullite sand was dried at 30°C for 4 hours to prepare the surface layer; 200-400 mesh Al 2 o 3The powder and titanium dioxide sol are configured into a slurry with a flow c...

Embodiment 2

[0039] According to the ratio of the molar ratio of titanium compound to alcohol of 1:3, tetraethyl titanate and methanol are configured into an alcohol solution of titanium compound, and the alcohol solution of titanium compound is added dropwise to the aqueous solution of nitric acid with a pH of 3.0 while stirring Hydrolyzed in medium, and the molar ratio of titanium compound and acid aqueous solution is 1:80, after refluxing at 60°C for 10 hours, the obtained sol is evaporated at 55°C to remove alcohols to obtain titanium dioxide sol; the particle size is 200 ~400 mesh boron nitride powder and titanium dioxide sol are configured into a slurry with a flow cup viscosity of 15 seconds at a weight ratio of 3:1; the above slurry is coated and hung on a wax model, and the sanding particle size is 40~100 mesh. Mullite sand was dried at 40°C for 5 hours to prepare the surface layer; 200-400 mesh Al 2 o 3 The powder and titanium dioxide sol are configured into a slurry with a flow...

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Abstract

The invention discloses a method for preparing a titanium alloy mold shell. The method for preparing the titanium alloy mold shell comprises the steps that firstly, titanium dioxide sol is prepared and serves as a binder, then is mixed with boron nitride powder and Al2O3 powder and slurry is prepared for manufacturing the titanium alloy mold shell, finally, dewaxing and sintering are conducted, and the environment-friendly titanium alloy mold shell with good stability is obtained. According to the method for preparing the titanium alloy mold shell, boron nitride is used as a surface layer, Y2O3 and Al2O3 are used as a transition layer, electro-melting mullite is used as a stuccoing layer, combination firmness of the surface layer and the back layer is ensured, selection and combination ofkinds of ceramics solve the problems of low precision, poor stability and existing of certain harm in existing titanium alloy mold shell preparing, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of casting titanium alloys, and relates to a preparation method of a titanium alloy mold shell. Background technique [0002] Titanium is a new type of engineering metal material that rises rapidly after steel, iron, copper and aluminum. It has the characteristics of high strength, low density, corrosion resistance, non-magnetic properties, and good biocompatibility, and is more and more popular among people. In the early stage, it was mainly used in the military field, and now it is gradually expanding to the civilian field, and the growth is rapid. [0003] At present, the mold shells used for titanium alloy precision casting can be roughly divided into: graphite mold shells, tungsten surface ceramic mold shells, oxide ceramic mold shells, etc. Among them, the casting casted by the graphite formwork has a layer of carburized α brittle layer on the surface with a thickness of about 0.2-0.3 mm, which may ca...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C3/00B22C13/08
CPCB22C1/00B22C3/00B22C13/085
Inventor 周辉良刘宝权王荣生文锐
Owner BAOJI YONGSHENGTAI TITANIUM IND
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