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Hot investment precision casting technique for rare earth ceramic cased titanium alloys

A technology of investment precision casting and yttrium rare earth, which is applied in casting molding equipment, casting molds, cores, etc., can solve the problems of high cost, pollution size of castings, difficult to control, etc., and achieve the effect of low cost, improved quality and performance

Active Publication Date: 2007-02-14
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphite shell titanium alloy investment casting technology has problems such as serious pollution to castings and difficult to control the size, while OW ceramic shell titanium alloy investment casting technology has high cost, strong chilling effect, and easy to cause high Density inclusion problem, surface roughness ≥ 6.3μm, minimum wall thickness of the casting is greater than 1.5mm, and the thickness of the contamination layer on the surface of the casting is about 0.25mm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Yttrium rare earth ceramic shell titanium alloy investment precision casting method, including pressing the wax mold according to the set shape; making the yttrium rare earth ceramic shell based on the wax mold, coating the shell reinforcement layer, dewaxing the shell, and roasting the yttrium rare earth ceramic shell , titanium or titanium alloy pouring, made of titanium or titanium alloy precision castings. Its technical points are:

[0035] 1. Production of yttrium rare earth refractories.

[0036] The yttrium rare earth oxide and stabilizer are uniformly mixed, calcined in a high-temperature kiln, the calcining temperature is controlled at 1850°C, and the calcining time is 24 hours, and crushed into fine powder. The stabilizer is ZrO 2 or CaO. The composition of yttrium rare earth oxide is Y 2 o 3 +ReO is 90%, ZrO 2 6.5% and CaO 3.5%.

[0037] 2. Wax mold pressing

[0038] Wax mold pressing uses medium temperature mold material T-8.5.

[0039] The pressing...

Embodiment 2

[0057] Embodiment 2 is basically the same as Embodiment 1, except that during the manufacturing process of the yttrium rare earth refractory, the calcination temperature is controlled at 1730°C, the calcination time is controlled at 20h, and the yttrium rare earth oxide composition is Y 2 o 3 +ReO is 75%, ZrO 2 20% and CaO 5%; the temperature of the working environment is controlled at 16°C and the relative humidity is controlled at 45% during the wax mold pressing process; the temperature of the working environment is controlled at 16°C, the relative humidity is controlled at 45%, the temperature of the surface coating is controlled at 9°C, the viscosity of the surface coating is controlled at 15sec, and the natural drying time is 10h; Control at 16°C, relative humidity at 45%, temperature of facing paint at 12°C, viscosity of facing layer paint at 10sec, paint mixing time of 0.8h, add Y to the shell facing layer material 2 o 3 20% of the microbeads, and the natural drying...

Embodiment 3

[0059] Embodiment 3 is basically the same as Embodiment 1, except that during the manufacturing process of the yttrium rare earth refractory, the calcination temperature is controlled at 1900°C, the calcination time is controlled at 22h, and the composition of yttrium rare earth oxide is Y 2 o 3 +ReO is 75%, ZrO 2 15% and CaO 10%; the temperature of the working environment is controlled at 28°C during the wax mold pressing process, and the relative humidity is controlled at 75%; the temperature of the working environment is controlled at 28°C, the relative humidity is controlled at 75%, the temperature of the surface coating is controlled at 23°C, the viscosity of the surface coating is controlled at 28sec, and the natural drying time is 24h; Control at 30°C, relative humidity at 85%, temperature of facing paint at 25°C, viscosity of facing layer paint at 18sec, paint mixing time of 2.5h, add Y to the shell facing layer material 2 o 3 45% of microbeads, and the natural dryi...

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Abstract

The invention relates to a microcast technology of rare earth ceramic shell titanium alloy wax mold which comprises the following craft processes: preparing rare earth fire resistive material, coating shell surface course, back padding shell and so on. The procedure of rare earth fire resistive material is mixing rare earth oxide and stabilizer, burning it in high temperature furnace and controlling the temperature at 1850 deg. The procedure of coating shell surface course is mixing rare earth oxide and zirconium acetate solution with the charge ratio: 3.4:1. Immerging the wax mold into surface course paint with the working temperature at 25 deg. and relative humidity at 70%, the temperature of surface course paint at 20 deg. and the viscosity of surface course paint at 22sec. The procedure of back padding shell is putting the shell into case and filling silicate-bonded sand and discharging the gas hole between the case and shell, then drying it.

Description

(1) Technical field [0001] The invention relates to a precision casting technology, in particular to a precision casting method for investment casting of titanium alloy with yttrium rare earth ceramic shell. (2) Background technology [0002] Titanium is a new type of engineering metal material that has risen 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. At present, titanium alloy precision casting mainly adopts graphite shell titanium alloy investment casting technology and OW ceramic shell titanium alloy investment casting technology, and has manufactured a variety of thin-walled and complex titanium precision casting products for military and civilian field...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C3/00
Inventor 谢华生赵军于志强郭培军
Owner SHENYANG RES INST OF FOUNDRY
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