Shell for titanium and titanium alloy precision casting and preparation method thereof

A precision casting and titanium alloy technology, which is applied in the field of alloy precision casting, can solve problems such as easy gelation and sensitivity to pH changes

Active Publication Date: 2013-03-27
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Shell for titanium and titanium alloy precision casting and preparation method thereof
  • Shell for titanium and titanium alloy precision casting and preparation method thereof
  • Shell for titanium and titanium alloy precision casting and preparation method thereof

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Embodiment Construction

[0015] Specific embodiments of the present invention will now be described below.

[0016] The mold shell preparation process and steps of the present embodiment are as follows:

[0017] (1) Preparation of coating: Add zirconium diacetate binder to the finely ground barium zirconate powder that has passed through a 325-mesh sieve and continuously stir it with a stirrer to control the viscosity of the coating slurry at about 30s. The weight ratio of the binder is 4:1;

[0018] (2) Preparation of the mold shell: Dip the wax mold into the above-prepared paint, wait for a while, and when the paint is evenly coated on the wax mold, you can sprinkle sand, and evenly scatter the barium zirconate dry powder on the paint and hang it. The process of coating wax mold and sanding is repeated once; then the back layer coating is carried out; the binder used in the back layer coating is ethyl silicate or silica sol, the filler used is mullite powder, and the back layer coating slurry is us...

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Abstract

The invention discloses a shell for titanium and titanium alloy precision casting and a preparation method thereof, and belongs to the technical field of the alloy precision casting. Through taking barium zirconate as packing, and taking zirconium acetate or yttrium sol which does not react with titanium as a binder, the shell disclosed by the invention is prepared through the steps of: pre-treating, molding, hardening, sintering, and the like. The extent of the reaction between the shell and the titanium as well as titanium alloys is small, and the thickness of a sticky dirty layer formed on the surface of a casting piece is small; the barium zirconate ceramic shell is high in strength, and the roughness of the surface of the casting piece is high; and in addition, a barium zirconate containing coating is stable and uneasy to gelatinize, good in suspension property, and long in retention time.

Description

technical field [0001] The invention relates to a mold shell for precision casting of titanium and titanium alloys and a preparation method thereof, and belongs to the technical field of alloy precision casting. Background technique [0002] Titanium and titanium alloys are widely used in aerospace industry, energy industry, marine transportation, chemical industry, etc. due to their excellent properties such as low density, high specific strength, and corrosion resistance. However, titanium and titanium alloys have high chemical activity at high temperatures and undergo chemical reactions with various commonly used refractory materials. This requires very high chemical stability of refractory materials and binders used in titanium alloy casting. At present, the most commonly used titanium alloy precision casting molds can be roughly divided into: graphite molds, tungsten surface ceramic molds, oxide ceramic molds, etc. Among them, the casting cast from the graphite shell ...

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 姜敏鲁雄刚李重河张如林谭光祥张东何文英何建平
Owner SHANGHAI UNIV
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