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Method for producing metallic titanium and titanium alloy castings through ceramic molds

A ceramic type and titanium alloy technology, which is applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve the problems of high price, poor working environment, and complicated cycle, so as to improve the production environment, reduce production costs, and increase The effect of production efficiency

Inactive Publication Date: 2014-03-19
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of investment casting is the complex and long-term process from pressing wax patterns, forming trees, molding, dewaxing, roasting, and then pouring into castings.
[0004] The graphite type has problems such as complex processing, poor working environment, and serious pollution.
[0005] However, due to the high chemical activity of titanium, commonly used refractory materials will react violently with molten titanium, and cannot be used as surface layer modeling materials for investment casting precision casting of titanium alloys.
Among all the materials at present, only calcium oxide, calcium zirconate, yttrium oxide, zirconia or tungsten powder can be used as the surface layer material of molten metal titanium, but the molding materials commonly used in titanium alloy investment precision casting are yttrium oxide and zirconia Or tungsten powder, there are problems of expensive price and complicated production process. Calcium oxide is the best material that does not react with molten titanium metal, but it cannot be applied because of the problem of water absorption. Calcium zirconate has not yet attracted attention

Method used

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  • Method for producing metallic titanium and titanium alloy castings through ceramic molds
  • Method for producing metallic titanium and titanium alloy castings through ceramic molds
  • Method for producing metallic titanium and titanium alloy castings through ceramic molds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] See figure 1 Process flow chart of Ti-6Al-4V alloy casting produced by yttrium oxide ceramic core method.

[0021] After the fused yttrium oxide micro-powder, stabilizer, binder and dispersant are uniformly mixed, the ceramic green body is prepared by isostatic pressing technology, and sintered at 1500-1900°C to form a zirconia ceramic type.

[0022] The Ti-6Al-4V alloy is poured into the zirconia ceramic mold to produce titanium alloy castings. The small and medium-sized titanium alloy castings produced have dense structure, smooth surface, no sticky sand, high dimensional accuracy and no need for processing.

[0023] The yttrium oxide ceramic type is recycled after cleaning and crushing, or as surface sand for precision casting titanium alloy.

Embodiment 2

[0025] See figure 2 Process flow chart of producing titanium-nickel alloy castings by zirconia ceramic core method.

[0026] After uniformly mixing zirconia micropowder, stabilizer, binder and dispersant, the ceramic biscuit is prepared by grouting molding, and after drying and debinding, sintering at 1500-1900 ° C into a zirconia ceramic type .

[0027] The titanium-nickel alloy is poured into the zirconia ceramic mold to produce titanium-nickel alloy castings. The small and medium-sized titanium-nickel alloy castings produced have dense structure, smooth surface, no sticky sand, high dimensional accuracy and no need for processing.

[0028] The zirconia ceramic type is recycled after cleaning and crushing, or recycled as surface sand for precision casting titanium alloy.

Embodiment 3

[0030] See image 3 Process flow chart of producing titanium alloy castings by calcium zirconate ceramic core method.

[0031] The dispersant is ammonium polyacrylate, the organic monomer is acrylic acid monomer (DMAA), the crosslinking agent is MBAM (N, N:-methylenebisacrylamide), the initiator is ammonium persulfate (APS), and the dispersion medium is Deionized water, polyethylene glycol (PEG).

[0032] Add a certain amount of dispersant to the premix (the premix is ​​an aqueous solution of monomers and crosslinking agents, where DMAA:MBAM=10:l, mass ratio), and the amount of dispersant is calcium zirconate powder 0.6% of the mass, adjust the pH value to 9-10 with ammonia water, and the solid phase volume fraction is 50 vol%. Put the required medicines and zirconia balls into a nylon tank for ball milling at a speed of 200 r / min. The material ratio is 2:1 (mass ratio), and the ball milling time is 6 h. Add 1 wt% (mass fraction of the monomer) initiator to the prepared sl...

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Abstract

The invention discloses a method for producing metallic titanium and titanium alloy castings through ceramic molds and relates to a method for producing alloy castings. According to the method, metallic titanium and titanium alloy castings are produced through ceramic molds. The ceramic molds comprise yttrium oxide ceramic molds, zirconia ceramic molds, calcium zirconate ceramic molds or calcium oxide ceramic molds. The forming method for biscuits of the ceramic molds for the titanium alloy castings comprises compression molding forming, isostatic compaction, slip casting, gel casting and hot box core shooter injection molding. The ceramic molds can be recycled or used as surface materials for fired mold precision casting. According to the method, the ceramic molds are not reacted with titanium alloy at the high temperature, and the bright and clean and near-net formed titanium alloy castings are produced; besides, the production cost can be reduced, and the production environment is improved.

Description

technical field [0001] The invention relates to a method for preparing alloy castings, in particular to a method for preparing metallic titanium and titanium alloy castings by using a ceramic type. Background technique [0002] Titanium and titanium alloys are widely used in various fields due to their excellent properties. Graphite type and investment casting are important methods for forming titanium alloy castings, but the production cost of titanium alloy parts remains high, so people are exploring ways to reduce the production cost of titanium alloy parts. [0003] The main advantages of the investment precision casting process are: high dimensional accuracy and good surface quality of the castings, and the ability to produce castings with various complex structures and wide applicability of alloys. Therefore, it is widely used in small and medium-sized titanium and titanium alloy castings. The main disadvantage of investment casting is the complex and long-term pr...

Claims

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Application Information

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IPC IPC(8): B22D21/02B22C9/06
Inventor 曹大力
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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