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Method for promoting green body densification by utilizing hydrogen absorption expansion of titanium-containing substance

A densification and material technology, which is applied in the densification of metal matrix composites, alloys, and metals, can solve problems such as high costs, achieve low production costs, uniform structure, and improve product performance.

Active Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processes are more expensive

Method used

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  • Method for promoting green body densification by utilizing hydrogen absorption expansion of titanium-containing substance
  • Method for promoting green body densification by utilizing hydrogen absorption expansion of titanium-containing substance
  • Method for promoting green body densification by utilizing hydrogen absorption expansion of titanium-containing substance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 1. Put a titanium product with a density of 83% (industrial pure titanium, titanium content > 98%) into a stainless steel mold. The fit gap between the product and the mold is less than 0.1 mm, and the mold is packaged and fastened.

[0066] 2. Put the assembled mold into an atmosphere sintering furnace, heat it to 800°C under an argon atmosphere, and keep it warm for one hour; inject hydrogen (hydrogen gas flow rate is 1L / min), and cool down to 600°C at a rate of 1°C / min. Keep feeding hydrogen and keep it warm for 4 hours, and the furnace is cold.

[0067] 3. Turn to vacuum sintering furnace, vacuumize (vacuum degree is less than 10 -3 Pa), raise the temperature to 650°C, keep the furnace for 2 hours, and then stop the furnace for cooling.

[0068] 4. Open the vacuum sintering furnace, take out and open the mold, and obtain a titanium alloy product with a density greater than 91%.

Embodiment 2

[0072] 1. Put the titanium alloy product with a density of 93% into a stainless steel mold, the fit gap between the product and the mold is less than 0.1 mm, and then seal and fasten the mold.

[0073] 2. Put the assembled mold into an atmosphere sintering furnace, heat it to 800°C under an argon atmosphere, and keep it warm for 1 hour; inject hydrogen (hydrogen gas flow rate is 1L / min), and cool down to 650°C at a rate of 0.5°C / min. Keep feeding hydrogen and keep it warm for 4 hours, and the furnace is cold.

[0074] 3. Put the mold into the vacuum sintering furnace, vacuumize (vacuum degree is less than 10 -3 Pa), raise the temperature to 800°C, keep the furnace for 2 hours, and then stop the furnace for cooling.

[0075] 4. Open the vacuum sintering furnace, take out and open the mold, and obtain a titanium alloy product with a density greater than 99.5%.

Embodiment 3

[0079] 1. Put a stainless steel mold into a titanium alloy with a composition of Ti-6Al-4V and a density of 88%, and seal and fasten the mold.

[0080] 2. Put the assembled mold into the atmosphere sintering furnace, heat it up to 800°C in an argon atmosphere, and keep it warm for one hour; change the hydrogen gas (hydrogen flow rate is 1L / min), cool down to 650°C at a rate of 2°C / min, and keep Introduce hydrogen and keep warm for 4 hours, and the furnace is cooled.

[0081] 3. Turn to vacuum sintering furnace, vacuumize (vacuum degree is less than 10 -3 Pa), raise the temperature to 750°C, keep the furnace for 2 hours, and then stop the furnace for cooling.

[0082] 4. Open the vacuum sintering furnace, take out and open the mold, and obtain a titanium alloy product with a density greater than 95%.

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Abstract

The invention relates to a method for promoting green body densification by utilizing hydrogen absorption expansion of a titanium-containing substance. According to the method, a titanium-containing substance block, or material formed by filling the titanium-containing substance block and a material to be densified, or material formed by enabling titanium-containing substance powder to be tightlymatched with the material to be densified is loaded into a rigid mold, and a pretreatment assembly is obtained; hydrogen is introduced into the pretreatment assembly to enable the titanium-containingsubstance to absorb hydrogen; and the titanium-containing substance self and / or the material to be densified is densified by utilizing the volume expansion effect of the titanium-containing substance.The invention provides a method for preparing a high-density or full-density green body at a medium-low temperature in a hydrogen atmosphere. According to the method, the structure can be refined while the density is improved and the defects are repaired, and the mechanical property of the material is effectively improved.

Description

technical field [0001] The invention relates to a method for densification of metals, alloys and metal-based composite materials; in particular, it relates to a method for promoting the densification of blanks by using titanium-containing substances to absorb hydrogen and expand. Background technique [0002] Titanium alloy is an important metal developed in the middle of the 20th century. Because of its excellent properties such as low density, high specific strength, good corrosion resistance, high heat resistance, non-magnetic, and good welding performance, it has attracted widespread attention. There are many ways to prepare titanium alloys, including casting, laser forming and powder metallurgy forming, but its high cost affects its wide application. [0003] During the preparation and use of titanium alloys, certain pores are often generated inside the material. Liquid metal will shrink in volume during cooling and solidification, which can form porosity or shrinkage ...

Claims

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Application Information

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IPC IPC(8): B22F3/24B30B12/00
CPCB22F3/24B30B12/00
Inventor 周承商林方睿刘咏孙沛陈奏君
Owner CENT SOUTH UNIV