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A method of regulating hydrogen content to improve the performance of titanium alloy prepared from titanium hydride powder

A technology of titanium hydride powder and hydrogen content, applied in the field of powder metallurgy, can solve the problems of demanding deformation speed and deformation temperature, unsatisfactory mechanical properties and processing properties, poor thermoplasticity of titanium alloys, etc., to improve the microstructure and mechanical properties. , shorten the production and alloy optimization processing process, improve the effect of plastic properties

Active Publication Date: 2019-01-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the microstructure of titanium alloy prepared by powder metallurgy method is relatively coarse, resulting in poor thermoplasticity, mechanical properties and processing properties of titanium alloy, which make the plastic deformation of titanium alloy have strict requirements on deformation speed and deformation temperature.

Method used

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  • A method of regulating hydrogen content to improve the performance of titanium alloy prepared from titanium hydride powder
  • A method of regulating hydrogen content to improve the performance of titanium alloy prepared from titanium hydride powder
  • A method of regulating hydrogen content to improve the performance of titanium alloy prepared from titanium hydride powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) For TiH 2 powder for TG / DSC thermal analysis (eg image 3 shown), to find out the TiH 2 The key dehydrogenation temperature points for decomposition are 400°C, 500°C, 600°C, and 750°C, and a corresponding sintering system is formulated. The heating rate is 5°C / min, and each key dehydrogenation temperature point is kept for 25 minutes respectively, reaching the final sintering temperature of 1400°C Keep warm for 4 hours.

[0027] (2) TiH 2 Press the powder into the crucible after weighing, put the compact into the crucible, and place it in the center of the heating body 5, cover the furnace cover 1, check that the auxiliary equipment is normal, start the control cabinet, input the mass of the compact before sintering on the display terminal, and turn on the cooling system;

[0028] (3) Turn on the vacuum system 7 until the vacuum degree in the furnace reaches 1×10 -3 After Pa, set the sintering system set in 2 on the panel of the control cabinet, and turn on the...

Embodiment 2

[0033] (1) The TiH prepared according to the composition ratio of Ti-6Al-4V alloy 2 The powder and the Al-V alloy powder are ball milled in a planetary ball mill at a rotational speed of 250r / min for 2 hours until fully mixed.

[0034] (2) to TiH 2 and Al-V alloy mixed powder for TG / DSC thermal analysis (such as Figure 4 shown), to find out the TiH 2The key dehydrogenation temperature points for the decomposition of Al-V alloy mixed powder are 420°C, 500°C, 600°C, and 750°C, and the corresponding sintering system is formulated. The heating rate is 8°C / min, and each key dehydrogenation temperature point is kept for 30 minutes. , When it reaches the final sintering temperature of 1150 ° C, it is kept for 3 hours.

[0035] (3) Compress the mixed powder into a crucible after weighing, place the compact in the center of the heating body 5, and cover the furnace cover 1. After checking that the auxiliary equipment is normal, start the control cabinet and input the pressure on th...

Embodiment 3

[0041] (1) TiH prepared according to the ratio of Ti-13Nb-13Zr alloy composition 2 powder, Nb powder and ZrH 2 Put it into a planetary ball mill for ball milling at a speed of 300r / min, and mill for 3 hours until fully mixed.

[0042] (2) to TiH 2 , Nb and ZrH 2 TG / DSC thermal analysis of alloy mixed powder to find out TiH 2 , Nb and ZrH 2 The key dehydrogenation temperature points for the decomposition of alloy mixed powder are 400°C, 500°C, 600°C, 750°C, and 800°C, and the corresponding sintering system is formulated. The heating rate is 10°C / min, and each key dehydrogenation temperature point is kept for 40 minutes respectively. When it reaches the final sintering temperature of 1800°C, it is kept for 2 hours.

[0043] (3) Compress the mixed powder into a crucible after weighing, place the compact in the center of the heating body 5, and cover the furnace cover 1. After checking that the auxiliary equipment is normal, start the control cabinet and input the pressure on...

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Abstract

The invention discloses a method for regulating hydrogen content to improve the performance of titanium alloy prepared by titanium hydride powder, which belongs to the technical field of powder metallurgy. The method of the present invention modifies the properties of the titanium alloy by regulating the hydrogen content in the process of preparing the titanium alloy through the dehydrogenation of the titanium hydride powder, significantly improves the microstructure and mechanical properties of the powder metallurgy titanium alloy, optimizes the sintering process, and greatly shortens the production and processing time. Optimize the processing flow of the alloy to reduce the production cost of titanium alloy. The device of the present invention includes a cooling system, a vacuum system, a heating and heat preservation system, a hydrogen content detection system, a control system and the like. The device can realize multi-temperature section sintering control, and is suitable for titanium alloy products at various sintering temperatures such as 1150~1800°C; it can realize the regulation of hydrogen content in the sintering process of powder metallurgy titanium alloy prepared from TiH2 powder, and carry out titanium alloy production. Hot hydrogen treatment; the hydrogen content of the sintered titanium alloy can meet the GB / T4698-2011 testing standard.

Description

technical field [0001] The invention relates to a method for regulating hydrogen content to improve the performance of titanium alloy prepared by titanium hydride powder, which belongs to the technical field of powder metallurgy. Background technique [0002] Titanium and titanium alloys have been attracting attention due to their low density, high specific strength, good corrosion and heat resistance, and good biocompatibility. However, the high cost of producing titanium alloys limits their use. Using powder metallurgy to TiH 2 The preparation of titanium products from raw materials reduces the investment in titanium processing links and equipment, improves production efficiency, and reduces manufacturing costs. It has become an international research hotspot in recent years. Patent application number 201010274240.2 proposes a process for preparing titanium and titanium alloy products from titanium hydride powder, and patent application number 201110173539.3 proposes a va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04B22F3/00
CPCC22C1/0458B22F3/001B22F3/003
Inventor 张家敏胡慧茹
Owner KUNMING UNIV OF SCI & TECH
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