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Method for preparing foamed TiAl intermetallic compound

A technology of intermetallic compounds and foams, which is applied in the field of preparing foamed TiAl intermetallic compound materials by adding composite pore-forming agents, which can solve the problems of low porosity, high thermal conductivity, difficulty in applying heat insulation and sound insulation, etc. The process is simple and controllable, which is conducive to the effect of large-scale production

Inactive Publication Date: 2011-05-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the TiAl intermetallic compound porous material prepared by the reaction synthesis method has low porosity and high thermal conductivity, making it difficult to be used in the fields of heat insulation and sound insulation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mix 80% Ti element powder and 20% Al element powder according to the mass ratio, wherein: Ti powder particle size is 300-400 mesh, Al powder particle size is 200-300 mesh, according to the mixed powder of Ti Al powder and pore-forming agent The total volume is 100%, adding ammonium bicarbonate accounting for 25% of the total volume of the mixed powder, urea accounting for 10% of the total volume of the mixed powder, and calcium carbonate accounting for 5% of the total volume of the mixed powder; ball mill mixing, the ball-to-material ratio is 8: 1. The mixing time is 4h. Compression molding is adopted to obtain a molded blank; the pressing pressure is 200MPa; the molded blank is placed in a vacuum degree of 1.0×10 -1 In a Pa heating furnace, heat up to 80°C at a heating rate of 5°C / min, hold for 30 minutes, and degrease at a low temperature stage; then, heat at a heating rate of 5°C / min to 200°C, hold for 80 minutes, and perform degreasing at a medium temperature stage;...

Embodiment 2

[0021] Mix 60% Ti element powder and 40% Al element powder according to the mass ratio, wherein: Ti powder particle size is 200-325 mesh, Al powder particle size is 325-400 mesh, according to the mixed powder of Ti Al powder and pore-forming agent The total volume is 100%, adding ammonium carbonate accounting for 20% of the total volume of the mixed powder, zinc stearate accounting for 30% of the total volume of the mixed powder, and calcium carbonate accounting for 30% of the total volume of the mixed powder; 10:1, the mixing time is 6h. Cold isostatic pressing is used to press and form a compact to obtain a compact; the compaction pressure is 300MPa; the compact is placed in a vacuum of 1.0×10 -2 In a Pa heating furnace, heat up to 60°C at a heating rate of 9°C / min, hold for 60 minutes, and degrease at a low temperature stage; then, heat at a heating rate of 2°C / min to 340°C, hold for 60 minutes, and perform degreasing at a medium temperature stage; finally, Heat up to 840°...

Embodiment 3

[0023] Mix 50% Ti element powder and 50% Al element powder according to the mass ratio, wherein: Ti powder particle size is 100-200 mesh, Al powder particle size is 200-325 mesh, according to the mixed powder of Ti Al powder and pore-forming agent The total volume is 100%, adding ammonium bicarbonate accounting for 15% of the total volume of the mixed powder, zinc stearate accounting for 25% of the total volume of the mixed powder, and magnesium carbonate accounting for 35% of the total volume of the mixed powder; It is 6:1, and the mixing time is 8h. Cold isostatic pressing is used to press and form to obtain a compact; the pressing pressure is 50MPa; the compact is placed in a vacuum at 1.0×10 -3 In a Pa heating furnace, heat up to 70°C at a heating rate of 6°C / min, hold for 90 minutes, and degrease at a low temperature stage; then, heat at a heating rate of 8°C / min to 180°C, hold for 120 minutes, and perform degreasing at a medium temperature stage; finally, Heat up to 800...

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PUM

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Abstract

The invention discloses a method for preparing a foamed TiAl intermetallic compound. The method comprises the following steps of: adding 15 to 35 percent of low-temperature decomposition temperature pore-forming agent, 10 to 40 percent of moderate-temperature decomposition temperature pore-forming agent and 5 to 35 percent of high-temperature decomposition temperature pore-forming agent according to the total volume of 100 percent of mixed powder of TiAl powder and the pore-forming agents; uniformly mixing and performing compression molding; heating under vacuum; preserving heat at a low-temperature stage, a moderate-temperature stage and a high-temperature stage respectively; removing the pore-forming agents in turn; and sintering to obtain a high-porosity foamed TiAl intermetallic compound material with certain strength. The prepared TiAl intermetallic compound porous material has the porosity of over 80 percent, certain structural strength, high porosity, a simple and controllable process, stable quality and high repeatability, contributes to large-scale production and is suitable for the field of high-temperature heat insulation.

Description

technical field [0001] The invention discloses a method for preparing a foamed TiAl intermetallic compound, in particular to a method for preparing a foamed TiAl intermetallic compound material by adding a composite pore-forming agent. The technical field of foam metal material preparation. Background technique [0002] TiAl intermetallic compound is a new type of material between ceramics and metal materials, with excellent material properties, such as low density, high elastic modulus, high thermal conductivity, high specific strength and specific stiffness, excellent High-temperature oxidation resistance, good resistance to various strong acids, strong alkalis, salt spray, chlorine molecules and chloride ion corrosion, and machinability, etc., have very considerable application prospects. [0003] At present, the pore-forming agents used to prepare porous materials mainly include polymethyl methacrylate (PMMA), polyvinyl butyral (PVB) and methyl cellulose, etc. remove. ...

Claims

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Application Information

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IPC IPC(8): C22C1/08
Inventor 江垚贺跃辉
Owner CENT SOUTH UNIV
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