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Method for preparing high-strength micro porous metallic titanium block by dealloying titanium-molybdenum alloy

A porous metal and dealloying technology, applied in the field of porous metal materials, can solve the problems of low specific surface area of ​​large-pore porous metals, difficult to prepare active metals, etc., and achieve positive engineering application value, enhanced mechanical properties, and controllable porosity. Effect

Active Publication Date: 2020-03-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a titanium-molybdenum alloy in view of the disadvantages of the large-aperture porous metal prepared by the existing traditional method that the specific surface area is too low and the disadvantages and defects that the dealloying method is difficult to prepare the porous and active metal. Micro-porous metal titanium materials are prepared by dealloying method, and the methods of molten salt electrolytic deoxidation and secondary sintering are used to prepare porous metal titanium blocks with higher mechanical strength

Method used

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  • Method for preparing high-strength micro porous metallic titanium block by dealloying titanium-molybdenum alloy
  • Method for preparing high-strength micro porous metallic titanium block by dealloying titanium-molybdenum alloy
  • Method for preparing high-strength micro porous metallic titanium block by dealloying titanium-molybdenum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The titanium powder and molybdenum powder with a purity of ≥99.0% and a particle size of 2-5 μm are weighed at an atomic ratio of 65:35, and the mixed raw material powder is ball-milled on a light-duty low-energy ball mill at a speed of 240 rpm for 24 hours to make the compound The powder is mixed evenly; the composite powder is sintered in PAS (plasma activated sintering) under low pressure vacuum hot pressing, the vacuum degree is ≤10Pa, the sintering temperature is 900°C, the heating rate is 50°C / min, the holding time is 10min, and the sintering pressure is 50MPa , to obtain titanium-molybdenum alloy bulk. Put the cleaned titanium-molybdenum alloy into aqua regia, place the container at room temperature (20° C.), and record the time. Observe the bubbles of the active metal molybdenum in the container reacting with the aqua regia solution, and find that there are no bubbles in the solution after 20 hours, then take out the metal block and wash it repeatedly with alcoh...

Embodiment 2

[0045] The titanium powder and molybdenum powder with a purity of ≥99.0% and a particle size of 2-5 μm are weighed at an atomic ratio of 65:35, and the mixed raw material powder is ball-milled on a light-duty low-energy ball mill at a speed of 240 rpm for 24 hours to make the compound The powder is mixed evenly; the composite powder is sintered in PAS (plasma activated sintering) under low pressure vacuum hot pressing, the vacuum degree is ≤10Pa, the sintering temperature is 1100°C, the heating rate is 50°C / min, the holding time is 10min, and the sintering pressure is 50MPa , to obtain titanium-molybdenum alloy bulk. Put the cleaned titanium-molybdenum alloy into aqua regia, place the container at room temperature (20° C.), and record the time. Observe the reaction bubbles of active metal molybdenum and sulfuric acid solution in the container, and find that there are no bubbles in the solution after 20 hours, then take out the metal block and wash it repeatedly with alcohol an...

Embodiment 3

[0048] The titanium powder and molybdenum powder with a purity of ≥99.0% and a particle size of 2-5 μm are weighed at an atomic ratio of 65:35, and the mixed raw material powder is ball-milled on a light-duty low-energy ball mill at a speed of 240 rpm for 24 hours to make the compound The powder is mixed evenly; the composite powder is sintered in a PAS (plasma activated sintering) under low pressure vacuum hot pressing, the vacuum degree is ≤10Pa, the sintering temperature is 1300°C, the heating rate is 50°C / min, the holding time is 10min, and the sintering pressure is 50MPa , to obtain titanium-molybdenum alloy bulk. Put the cleaned titanium-molybdenum alloy into aqua regia, place the container at room temperature (20° C.), and record the time. Observe the reaction bubbles of active metal molybdenum and sulfuric acid solution in the container, and find that there are no bubbles in the solution after 20 hours, then take out the metal block and wash it repeatedly with alcohol ...

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Abstract

The invention provides a method for preparing a high-strength micro porous metallic titanium block by dealloying a titanium-molybdenum alloy. The method is characterized in that the titanium-molybdenum alloy is treated through plasma activated sintering, molybdenum in the alloy is corroded selectively in a dealloying manner, obtained porous titanium is subjected to deoxidation and secondary sintering by the combination with a molten salt electrolysis method, so that the purity and the mechanical performance of a porous titanium block are greatly improved, and the high-strength porous titaniumblock is obtained. A titanium-molybdenum bicontinuous three-dimensional network-structured titanium-molybdenum alloy is prepared through plasma activated sintering; the pore structure of the porous metallic titanium block is regulated and controlled by changing the content of titanium and molybdenum elements; the obtained porous titanium is subjected to deoxidation and secondary sintering by adopting the molten salt electrolysis method, so that the purity and the mechanical performance of the porous titanium block are greatly improved; the high-strength porous titanium block of which the aperture is 5-10 [mu]m, the porosity is 78.5%-44.6%, and the compressive strength can reach 152.3 MPa can be obtained by adopting the process; and the method has the advantages of simple process, low cost,high practicability and the like.

Description

technical field [0001] The invention belongs to the technical field of porous metal materials, and in particular relates to a method for preparing a high-strength micron porous metal titanium block by de-alloying a titanium-molybdenum alloy, deoxidizing it by using a molten salt electrolysis method, and performing secondary sintering. Background technique [0002] Porous metal has the characteristics of low relative density, high specific strength, large specific surface area, strong permeability, and good energy absorption. It is a multifunctional material integrating mechanical, thermal, acoustic, and electrical properties. Therefore, porous metals have abundant application fields, such as shock absorbers, filters, heat dissipation media, catalyst supports, sensors, etc. Metal titanium has been widely used in biomaterials and structural materials because of its good biocompatibility, light weight and high strength. Preparation of porous titanium with controllable porosity...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C14/00C22C3/00C25C3/28
CPCC22C1/0458C22C3/00C22C14/00C25C3/28
Inventor 陈斐王昊邹丽杰沈强张联盟
Owner WUHAN UNIV OF TECH
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