Method for preparing casting titanium and titanium-aluminum base alloy porous ceramic mould shell

A technology of porous ceramics and base alloys, applied in casting molding equipment, molds, mold components, etc., can solve problems such as large residual strength and cracks, and achieve the effects of reducing residual strength, good air permeability, and improving quality

Inactive Publication Date: 2008-01-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the existing cast titanium and titanium-aluminum-based alloy shells have high residual strength and easily cause cracks in the process of solidification and shrinkage of t...

Method used

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  • Method for preparing casting titanium and titanium-aluminum base alloy porous ceramic mould shell

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specific Embodiment approach 1

[0015] Specific implementation mode one: the preparation method of the cast titanium and titanium-aluminum-based alloy porous ceramic shell of the present embodiment is as follows:

[0016] Step 1: Wax mold pressing, the wax material is pressed at a temperature of 50-60°C to form a thin-sheet wax mold, and then cleaned with a wax mold cleaning agent and dried in the air.

[0017] Step 2: Coating and hanging of the shell surface layer: coating and hanging four layers of shell surface layers on the outer surface of the wax model, the production process of each layer of shell surface layer is: coating, sanding, and drying, wherein the coating and hanging It is to immerse the wax model in the surface coating with a viscosity of 80-100s in the flow cup for 3-5 seconds and take it out. When the coating on the wax model flows evenly and no longer drips continuously, sand it. The sanding should be uniform and comprehensive. ; The sanding uses zirconia soil sand with a particle size be...

specific Embodiment approach 2

[0032] Specific embodiment two: the difference between this embodiment and the preparation method of cast titanium and titanium-aluminum-based alloy porous ceramic shell described in specific embodiment one is that the surface coating described in step two is made of zirconium oxide (ZrO 2 ) powder, zirconium sol, defoamer n-octanol and wetting agent JFC, in which zirconia (ZrO 2 ) powder and the zirconium sol have a powder-to-liquid ratio of 3.8g / 1ml, the particle size of the zirconia powder is 150 mesh to 325 mesh, and the mass percentage of the defoamer n-octanol to the zirconium sol is 0.3wt% to 0.06wt%, The mass percentage of the wetting agent JFC in the zirconium sol is 0.2wt%-0.4wt%.

[0033] The preparation method of the surface coating is as follows: adding the zirconium sol with a concentration of 24% into the mixing drum for stirring, adding the defoamer n-octanol and the wetting agent JFC while stirring, and stirring until gelatinous, and mixing the stirred The je...

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and the preparation method of cast titanium and titanium-aluminum-based alloy porous ceramic shells described in specific embodiment two is that the zirconium oxide (ZrO 2 ) The particle size of the powder is 150 mesh to 250 mesh.

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Abstract

Disclosed is a preparation method of a porous ceramic shell of cast titanium and titanium aluminum alloys, relating to the melt mould precise casting field. The invention solves the problem that cracks are caused when the thin-walled titanium and the titanium aluminum alloys castings are solidified and shrunk due to the large residual intensity of the present shell of cast titanium and titanium aluminum alloys. The method is as following: firstly, wax mould pressing; secondly, coating and hanging four surface layers, and the manufacturing processes of each layer are that coating and hanging coatings of the surface layer, sprinkling zirconic sand, drying in the room temperature, and then the next layer is coated and hung; thirdly, coating and hanging two transitional layers, whose differences from coating and hanging the surface layers lie in that each coated and hung transitional layer comprises a high polymer and a back coating of water latex, and bauxite sand of 50 to 70 orders is sprinkled; fourthly, coating and hanging four to eight reinforcing layers, whose differences from hanging and coating the transitional layers lie in that the bauxite sand of 30 to 40 orders is sprinkled; fifthly, coating and hanging the coatings of an outer layer , which will be dried in the room temperature; sixthly, dewaxing by high pressure steam; seventhly, roasting the shell. The invention can be widely applied in the manufacturing of the shell of titanium and titanium aluminum alloys castings for the national defense and domestic use.

Description

technical field [0001] The invention relates to the field of investment precision casting, in particular to a preparation method for casting titanium and titanium-aluminum-based alloy porous ceramic shells. Background technique [0002] Titanium and titanium-aluminum-based alloys have the advantages of low density, high Young's modulus and high-temperature strength, good creep resistance and oxidation resistance, etc. Very good application prospects. However, the bottleneck hindering the large-scale application of titanium and titanium-aluminum-based alloys lies in their room temperature plasticity and difficult processing. As a technology that can produce complex-shaped and near-net-shape structural parts, investment investment casting is suitable for mass production, no machining allowance and complex components that are difficult to machine. At present, titanium and titanium-aluminum-based alloy investment casting technology mainly adopts oxide ceramic shell titanium an...

Claims

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Application Information

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IPC IPC(8): B22C9/04
Inventor 陈玉勇田竞卢玉红孔凡涛王惠光刘志光肖树龙徐丽娟陈艳飞周浩
Owner HARBIN INST OF TECH
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