Tantalum foam and preparation method thereof

A technology of foam and tantalum powder, which is applied in the field of foam tantalum and its preparation, can solve the problems of high cost of foam metal tantalum, difficult control, high equipment requirements, etc., and achieve the effect of low cost, simple equipment and easy realization

Inactive Publication Date: 2010-05-19
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high melting point of metal tantalum, the preparation of foamed tantalum in a molten state requires very high equipment, and the control is very difficult, and the cost of the prepared foamed tantalum is also high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 100g 10-20 mesh tantalum powder and 20g 10-20 mesh iron powder, and mix them on a mixer for 8 hours. pressed on hydraulic press The cylinder is put into the vacuum sintering furnace, and the vacuum degree in the vacuum furnace is maintained to be 10 -2 Pa, sinter at 1300°C for 1 hour, then raise the temperature to 1600°C, keep it warm for 3 hours, then drop to room temperature. Take out the cylindrical material block and put it into hydrochloric acid (used hydrochloric acid is the analytical pure hydrochloric acid with a mass fraction of 37%) and water equivolume mixed hydrochloric acid aqueous solution for 12 hours, then put the cylindrical material block into a fresh acid solution, and observe that When the bubbles are generated, it can be seen that the reaction is over and the iron is basically dissolved, then rinse with deionized water until the rinse solution is neutral, and then dry. Finally, put the cylindrical block into the vacuum furnace, and maintain...

Embodiment 2

[0027] Weigh 500g of tantalum chips and 500g of iron chips, the chips have a thickness of 0.1-0.3mm, a width of 0.5-1.5mm, and a length of 3-20mm. By simple hand mixing in the mixing pan, place the mixture in in the cylindrical die. pressed on hydraulic press put the cylinder into the vacuum sintering furnace, and maintain the vacuum degree in the vacuum furnace as 7×10 -3 Pa, sinter at 1300°C for 1 hour, then raise the temperature to 1700°C, keep it warm for 4 hours, and then drop to room temperature. Take out the cylindrical material block and put it into hydrochloric acid (the used hydrochloric acid is the analytically pure hydrochloric acid with a mass fraction of 37%) and water equal-volume mixed hydrochloric acid solution for 24 hours, during which the acid solution is changed twice, and then the cylindrical material block is put into a In the fresh acid solution, no air bubbles are observed, which means that the reaction is over and the iron is basically dissolved....

Embodiment 3

[0030] Weigh 100g of tantalum powder of 40-50 mesh and 60g of iron powder of 10-50 mesh to prepare the foamed tantalum material, and the rest are the same as in Example 1. The obtained foamed tantalum has a porosity of about 52%, the observed pore size is uneven, and the pores in the foamed tantalum are interconnected. The chemical analysis results of the foamed tantalum are as follows: the weight percentage of tantalum is more than 99.9%, and the weight percentage of impurity iron is less than 0.1%.

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Abstract

The invention belongs to the technical field of metal material preparation, and particularly relates to a tantalum foam and a preparation method thereof. The porosity of the tantalum foam is between 20 and 80 percent, pores in the tantalum foam are intercommunicated, and the tantalum foam accounts for over 99.9 percent of the weight of the tantalum. The preparation method comprises the following steps: uniformly mixing one of iron powder, iron dust, cobalt powder or nickel powder and tantalum powder or tantalum dust, and pressing the mixture into blocks; then, putting the blocks into a vacuum furnace, sintering the blocks for 0.5 to 2 hours at the temperature of between 1,200 and 1,400 DEG C, then heating the blocks to between 1,500 and 1,800 DEG C and sintering the blocks for 2 to 6 hours, and cooling the blocks to the room temperature; taking the blocks out, soaking the blocks into aqueous solution of hydrochloric acid till the reaction is finished, then washing the blocks by deionized water till the flushing solution is neutral, drying the blocks, finally putting the blocks into the vacuum furnace for sintering, and cooling the blocks to the room temperature. The process method of the invention has the characteristics of simple equipment implementation, easy control of the porosity of the foam metal, easy realization of special shape of the foam metal, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and in particular relates to foamed tantalum and a preparation method thereof. Background technique [0002] Metal tantalum is a refractory metal with a melting point of 2960°C. Among refractory metals, metal tantalum has excellent corrosion resistance and is the best known pure metal against chloride ion corrosion; and metal tantalum has excellent mechanical properties and processing properties; metal elements in the periodic table Among them, tantalum is the metal element with the best biocompatibility with human body. [0003] Foamed tantalum as a foamed metal has the performance characteristics of the above-mentioned tantalum metal. Due to the existence of pores in the foamed tantalum, the stress on the overall foamed metal block is easier to disperse, and other metals, non- Metals and organic materials are used for special purposes. Therefore, tantalum foam can be used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/02C22C1/08
Inventor 许文江
Owner 有研资源环境技术研究院(北京)有限公司
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