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Titanium and titanium alloy surface hardening and surface functionalization process

A technology of surface functionalization and treatment process, which is applied in the direction of metal material coating process, heating inorganic powder coating, coating, etc., can solve the problems of large product size limitation, difficult to obtain coating, and difficult promotion, etc., to achieve The effect of simple production equipment, low production cost and wide range of options

Active Publication Date: 2020-09-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, these special process technologies generally have high cost, difficulty in popularization, and relatively large restrictions on product size, especially difficult to obtain coatings with complex shapes, controllable thickness, and controllable porosity (>10mm)

Method used

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  • Titanium and titanium alloy surface hardening and surface functionalization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Put the titanium alloy block (Ti-6Al-4V) into figure 1 As shown in the stainless steel mold, the gap between the mold and the titanium alloy block is at the top of the cylindrical cavity, and the thickness is 5mm. The mixed powder containing 80% titanium powder and 20% carbon fiber is evenly filled in the mold, and the mold is packaged and fastened.

[0038] 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.

[0039] 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 4 hours, and then stop the furnace for cooling.

[0040] 4. Open the vacuum sintering furnace, take out and open the mold, continue to put the sample into ...

Embodiment 2

[0043]1. Put the titanium alloy block (Ti-6Al-4V) into figure 1 The stainless steel mold shown, the gap between the mold and the titanium alloy block is at the top of the cylindrical cavity, the thickness is 5mm, and it will contain 94% titanium powder, 6% B 4 The mixed powder of C is evenly filled in the mold, and the mold is sealed and fastened.

[0044] 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.

[0045] 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 4 hours, and then stop the furnace for cooling.

[0046] 4. Open the vacuum sintering furnace, take out and open the mold, continue to put the sample into the vacuum ...

Embodiment 3

[0049] 1. Put the titanium alloy block (Ti-6Al-4V) into a stainless steel mold, the gap between the mold and the titanium alloy block is the side of the cylinder, the thickness is 2mm, and the mixed powder containing 92% titanium powder and 8% graphite is placed in the mold Fill the mold evenly, seal and fasten the mold.

[0050] 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.

[0051] 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 4 hours, and then stop the furnace for cooling.

[0052] 4. Open the vacuum sintering furnace, take out and open the mold, continue to put the sample into the vacuum sintering furnace, vacuumize...

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Abstract

The present invention relates to a method of forming a surface coating by hydrogen treatment of titanium. The method comprises the steps of loading a to-be-processed workpiece A into a rigid mold, designing the size of an inner cavity of the mold to have a certain gap with the workpiece, and filling titanium-containing mixed powder B into the gap between the rigid mold and the workpiece to obtainan assembly C; loading the assembly into a high-temperature furnace, introducing hydrogen, and absorbing hydrogen; and then carrying out vacuum annealing dehydrogenation on the workpiece and the mold,shrinking the size of the workpiece after dehydrogenation, and conveniently taking out the workpiece from the mold. According to the mentod, in order to improve the quality of the coating, high-temperature sintering can be carried out after the dehydrogenation; and the high temperature sintering temperature is greater than the hydrogen absorption temperature and the dehydrogenation temperature. The invention provides the brand-new coating preparation method for the first time, the coating can be added with a plurality of functions and is convenient for large-scale application, meanwhile, thesurface hardness, density, thickness and porosity of the obtained coating are controllable, the uniformity is good, the surface of a complex shape can be treated, and the performance is obviously improved.

Description

technical field [0001] The invention relates to a process for surface hardening and surface functionalization of titanium and titanium alloys, and in particular to a method for forming a coating on the surface of titanium alloys through hydrogen treatment of titanium. Background technique [0002] Titanium alloys and titanium-based composite materials have a series of advantages such as low density, high specific strength, corrosion resistance, weldability, good medium temperature performance, and non-magnetic properties. They are widely used in aerospace, nuclear energy and chemical industries, and are widely used. important metal materials. [0003] Titanium alloys and titanium-based composite materials are difficult to process, high in processing costs, low in hardness, and poor in wear resistance, which limits the application of final products. Titanium alloy surface modification technology can improve the wear resistance of products, improve the corrosion resistance an...

Claims

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Application Information

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IPC IPC(8): C23C24/08C22F1/18C22F1/02
CPCC22F1/02C22F1/183C23C24/085
Inventor 周承商陈奏君林方睿刘咏
Owner CENT SOUTH UNIV
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