Preparation method of dual-scale titanium alloy material

A titanium alloy, two-scale technology, applied in the field of metallurgy, can solve the problems of difficult to control the grain size of products, long preparation time, high porosity, improve the density and mechanical properties, uniform grain distribution, and concise production process. Effect

Inactive Publication Date: 2017-12-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of Titanium alloys have several technical benefits compared to previous designs such as complex manufacturing processes or low strengths due to their high specific gravity (density). These improvements make them more suitable for use in various industries like defense industry where weight reduction plays an important role.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the quality of titania or tantalum metal composites made up of finer crystal sizes while reducing defect formation during manufacturing processes such as hot forming/welding techniques. Current methods have limitations in controlling these dimensions accurately without generating unwanted particles, resulting in poor overall physical property values like tensile elongation after being subjected to severe conditions.

Method used

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  • Preparation method of dual-scale titanium alloy material
  • Preparation method of dual-scale titanium alloy material
  • Preparation method of dual-scale titanium alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation process of the experimental fine-grained powder is as follows: on a low-temperature ball mill, liquid N 2 As the medium, ball milled at 600 rpm for 4 hours to obtain fine-grained powder. The XRD comparison patterns of the raw material TC4 titanium alloy powder and the fine-grained TC4 titanium alloy powder prepared by low temperature ball milling are as follows: figure 2 shown.

[0032] The composition ratio of the experimental double-scale titanium alloy material is: by mass, the coarse-grained TC4 alloy powder is 95%, the fine-grained powder is 5%, and the mixed powder is obtained by ball milling at a speed of 300 rpm on a planetary ball mill for 2 hours. The material body is degassed in a vacuum hot-press furnace with a heating rate of 10°C / min, without pressure, and heated to 350°C for 10 hours. After degassing, the surface is activated in a plasma activation sintering furnace. The surface activation time is 30s. The activation voltage is 20kV, th...

Embodiment 2

[0035] The preparation process of the experimental fine-grained powder is as follows: on a low-temperature ball mill, liquid N 2 As the medium, ball milled at 600 rpm for 4 hours to obtain fine-grained powder. The composition ratio of the experimental dual-scale titanium alloy material is: by mass, the coarse-grained TC4 alloy powder is 75%, the fine-grained powder is 25%, and the mixed powder is obtained by ball milling at a speed of 300 rpm on a planetary ball mill for 2 hours. The material body is degassed in a vacuum hot-press furnace with a heating rate of 10°C / min, without pressure, and heated to 350°C for 10 hours. After degassing, the surface is activated in a plasma activation sintering furnace. The surface activation time is 30s. The activation voltage is 20kV, the activation current is 100A, the vacuum degree is ≤10Pa, the temperature rises rapidly after surface activation, the heating rate is 100°C / min, the pressure is 20MPa, the temperature is raised to 900°C and ...

Embodiment 3

[0038] The preparation process of the experimental fine-grained powder is as follows: on a low-temperature ball mill, liquid N 2 As the medium, ball milled at 600 rpm for 4 hours to obtain fine-grained powder. The composition ratio of the experimental double-scale titanium alloy material is: by mass, the coarse-grained TC4 alloy powder is 50%, the fine-grained powder is 50%, and the mixed powder is obtained by ball milling at a speed of 300 rpm on a planetary ball mill for 2 hours. The material body is degassed in a vacuum hot-press furnace with a heating rate of 10°C / min, without pressure, and heated to 350°C for 10 hours. After degassing, the surface is activated in a plasma activation sintering furnace. The surface activation time is 30s. The activation voltage is 20kV, the activation current is 100A, the vacuum degree is ≤10Pa, the temperature rises rapidly after surface activation, the heating rate is 100°C / min, the pressure is 20MPa, the temperature is raised to 900°C an...

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Abstract

The invention discloses a preparation method of a dual-scale titanium alloy material. The preparation method comprises the following steps that titanium alloy powder as the raw materials is subjected to low-temperature ball-milling, and fine-grain titanium alloy powder is obtained; the fine-grain titanium alloy powder and the titanium alloy powder as the raw materials are mixed, and the fine-grain titanium alloy powder in the mixed powder accounts for 5-95 wt%; and the mixed powder is subjected to degassing in a premade graphite mould, the degassed mixed powder is sequentially subjected to surface activation and discharge plasma activated sintering (PAS), and the dual-scale titanium alloy material is obtained. The production process is concise, short in period and high in structure controllability, and the compactness and mechanical property of the titanium alloy material can be effectively improved; and in the obtained dual-scale dual-phase titanium alloy material, dual-scale crystal grains are evenly distributed, the comprehensive mechanical performance is excellent, majority of industrial requirements are met, and the preparation method capable of achieving the industrially applied dual-scale titanium alloy material is provided.

Description

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Claims

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Application Information

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Owner WUHAN UNIV OF TECH
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