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CaZrO3 mold shell used for titanium and titanium alloy precision casting and preparation method

A technology of precision casting and titanium alloy, applied in the field of CaZrO3 shell and its preparation, can solve the problems of easy gelation, sensitivity to pH value change, etc.

Active Publication Date: 2013-05-01
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zirconia, yttrium oxide, calcium oxide and other oxides that are less reactive with titanium liquid are mainly used in the surface layer and adjacent layer coatings of oxide ceramic shells. Among them, the surface layer coating with yttrium oxide as filler has better casting performance. However, yttrium oxide is prone to hydration, and its slurry is very sensitive to pH changes and is easy to gel
In addition, the oxide ceramic shell cannot avoid the formation of an α fouling layer on the surface of the casting, and the thickness of the α fouling layer ranges from 0.02 to 0.2 mm.

Method used

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  • CaZrO3 mold shell used for titanium and titanium alloy precision casting and preparation method
  • CaZrO3 mold shell used for titanium and titanium alloy precision casting and preparation method
  • CaZrO3 mold shell used for titanium and titanium alloy precision casting and preparation method

Examples

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Effect test

Embodiment 1

[0027] This embodiment is the preparation process and steps of preparing TiAl alloy castings with calcium zirconate shells:

[0028] (1) Preparation of paint: add binder zirconium diacetate to calcium zirconate powder that has been ground and passed through a 200-mesh sieve, and stir continuously with a stirrer to control the viscosity of the paint slurry at about 30s. Calcium zirconate powder The weight ratio of material to binder is 4.5:1;

[0029] (2) Preparation of the mold shell: Dip the wax mold into the above-mentioned coating, wait for a while, let the coating evenly hang on the wax mold, sprinkle sand, and evenly scatter the dry powder of calcium zirconate on the coating. On the coating wax model, the sanding process is repeated once; then the back coating is carried out; the binder used in the back coating is ethyl silicate or silica sol, and the filler used is mullite powder, and the weight ratio of the two is 1:4; apply the back coating slurry to the outer layer o...

Embodiment 2

[0035] This embodiment is the preparation process and steps of preparing TiNi alloy castings with calcium zirconate shells

[0036] (1) Preparation of paint: add binder zirconium diacetate to calcium zirconate powder that has been ground and passed through a 200-mesh sieve, and stir continuously with a stirrer to control the viscosity of the paint slurry at about 30s. Calcium zirconate powder The weight ratio of material to binder is 3.5:1;

[0037] (2) Preparation of the mold shell: Dip the wax mold into the above-mentioned coating, wait for a while, let the coating hang on the wax mold evenly, sprinkle sand, and evenly scatter the dry powder of calcium zirconate on the coating. On the coating wax model, the sanding process is repeated once; then the back coating is carried out; the binder used in the back coating is ethyl silicate or silica sol, and the filler used is mullite powder, and the weight ratio of the two is 1:4; apply the back coating slurry to the outer layer of...

Embodiment 3

[0043] This embodiment is the preparation process and steps of preparing Ti-6Al-4V alloy castings with calcium zirconate shells

[0044] (1) Preparation of paint: add binder zirconium diacetate to calcium zirconate powder that has been ground and passed through a 200-mesh sieve, and stir continuously with a stirrer to control the viscosity of the paint slurry at about 30s. Calcium zirconate powder The weight ratio of material to binder is 4:1;

[0045] (2) Preparation of the mold shell: Dip the wax mold into the above-mentioned coating, wait for a while, let the coating hang on the wax mold evenly, sprinkle sand, and evenly scatter the dry powder of calcium zirconate on the coating. On the coating wax model, the sanding process is repeated once; then the back coating is carried out; the binder used in the back coating is ethyl silicate or silica sol, and the filler used is mullite powder, and the weight ratio of the two is 1:4; apply the back coating slurry to the outer layer o...

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Abstract

The invention discloses a CaZrO3 mold shell used for titanium and titanium alloy precision casting and a preparation method, which is characterized in that calcium zirconate is taken as a filling material, binders which are not reacted with a titanium alloy such as zirconium acetate or yttrium sol are pretreated, molded, hardened, roasted and the like to prepare the mold shell. The mold shell has small reaction degree with titanium and the titanium alloy, the thickness of contamination formed on the casting surface is small; the calcium zirconate ceramic mold shell has high strength, the casting surface has high fineness; a paint containing calcium zirconate is stable and is not easy to be gelled, the suspensibility is good, and the preservation time is long.

Description

technical field [0001] The invention relates to a CaZrO used for precision casting of titanium and titanium alloys 3 Form shell and its preparation method. Background technique [0002] Titanium and titanium alloys have a series of excellent properties such as low density, high specific strength, corrosion resistance, and good biocompatibility, and are widely used in various fields such as aviation, aerospace, chemical industry, and medical treatment. However, titanium is a highly chemically active metal, and in the molten state, it will chemically react with almost all known refractory materials. This requires very high chemical stability of refractory materials and binders used in titanium alloy casting. [0003] At present, the shells for titanium alloy precision casting that are widely used can be roughly divided into: graphite shells, tungsten surface ceramic shells, oxide ceramic shells, etc. Among them, the casting casted by the graphite shell has a layer of carbur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C1/00B22C1/02B22C3/00
Inventor 李重河周菲菲鲁雄刚朱凯亮陈丽娜张东何文英何建平
Owner SHANGHAI UNIV
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