Multi-layer double-phase cross-scale structure pure titanium and preparation method thereof

A cross-scale, pure titanium technology, applied in the field of metal material processing and preparation or medical surgical implants, to achieve the effect of simple preparation process

Active Publication Date: 2022-04-29
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention provides a multi-layer dual-phase cross-scale structure pure titanium and its preparation method, which is a technical means for preparing multi-layer dual-phase cross-scale structur

Method used

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  • Multi-layer double-phase cross-scale structure pure titanium and preparation method thereof
  • Multi-layer double-phase cross-scale structure pure titanium and preparation method thereof
  • Multi-layer double-phase cross-scale structure pure titanium and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] The method for preparing pure titanium with a multi-layer dual-phase cross-scale structure is implemented according to the following specific steps:

[0034] Step 1, room temperature rolling:

[0035] Take a pure titanium plate with a thickness of 8mm as the initial material, cut length × width × height = 40 × 12 × 8mm from the initial material 3 pure titanium plate;

[0036] Adjust the distance between the rolls of the rolling mill to be 8mm, and the rotational speed is equal to 20mm / s.

[0037] Adjust the distance between the rolls to reduce it by 0.1 mm, send the sample into the rolls to complete one pass of rolling, change the feeding direction of the plate, and then carry out the second pass of rolling on the plate.

[0038] Repeat the above rolling process until a pure titanium plate with a thickness of 1 mm is obtained.

[0039] The microstructure of the room temperature rolled samples consisted of elongated lath-like α grains with an average grain size of abo...

Embodiment 2

[0052] In step 3, the excitation current of the electron beam etching heat treatment is 10mA, and the recovery annealing is as follows: put the sample into a vacuum tube furnace, raise the heating rate from room temperature to 300°C at a heating rate of 8°C / min, keep it warm for 10min, and then heat it at 5°C The cooling rate per minute is reduced to ambient temperature (below 50°C), cooled, and the vacuum tube furnace is filled with gas, and the recovered nanocrystalline α-titanium is taken out. All the other steps are identical to Example 1.

[0053] figure 1 The connecting line of the hollow circle in the above step is the hardness distribution pattern of each layer of the multi-layer dual-phase cross-scale structure pure titanium prepared in the above step Example 2. Compared with Example 1, the hardness value of the matrix nanocrystalline α-titanium is reduced to about 260HV. As it gets closer to the center of the etching heat treatment, the hardness value has a similar ...

Embodiment 3

[0056] In step 3, the excitation current of the electron beam etching heat treatment is 10mA, the moving speed of the electron gun is 2m / min, and the recovery annealing is: put the sample into a vacuum tube furnace, and raise the heating rate from room temperature to 200°C at a heating rate of 10°C / min , keep warm for 10 minutes, then lower the temperature below 50°C at a cooling rate of 3°C / min, cool down, inflate the vacuum tube furnace, and take out the recovered nanocrystalline α-titanium. All the other steps are identical to Example 1.

[0057] From Figure 7 It can be seen that, unlike Examples 1 and 2, the matrix nanocrystals in Example 3 do not exist and become completely fine-grained α-Ti, which will lead to a decrease in the overall strength of the sample and cannot maintain nano-crystalline α-Ti-fine-grained α Titanium-coarse-grained β-titanium multilayer dual-phase cross-scale structure. This is because the electron gun moves too slowly and the heat input is too ...

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Abstract

The invention discloses multi-layer double-phase cross-scale structure pure titanium and a preparation method thereof. The multi-layer double-phase cross-scale structure is composed of nanocrystalline alpha titanium, fine grain alpha titanium and coarse grain beta titanium. The preparation method of the multi-layer double-phase cross-scale structure pure titanium comprises the following steps that 1, a titanium plate is subjected to multi-pass rolling at the room temperature, and nanocrystalline alpha pure titanium is obtained; 2, carrying out recovery annealing on the nanocrystalline alpha pure titanium obtained in the step 1; and 3, the nanocrystalline alpha pure titanium obtained in the step 2 is subjected to etching heat treatment in a vacuum environment through a high-energy electron beam, and the multi-layer double-phase nanocrystalline alpha titanium-fine grain alpha titanium-coarse grain beta titanium cross-scale structure is obtained. According to the method, the problem that the pure titanium with the cross-scale uneven structure is obtained from the nanocrystalline pure titanium is solved, the obtained multi-layer double-phase pure titanium with the cross-scale structure can be used as a biological implant bearing structure material, the preparation process is simple and efficient, and large-scale production can be achieved. In addition, the preparation method disclosed by the invention can also be applied to the fields of surface modification of nanocrystalline materials and the like.

Description

technical field [0001] The invention relates to the technical field of metal material processing and preparation or medical surgical implants, in particular to a multilayer dual-phase cross-scale structure pure titanium and a preparation method thereof. Background technique [0002] After several generations of materials development, the mechanical properties of nanocrystalline metal materials have been greatly improved, and the mechanical properties such as material strength, fatigue damage resistance, and friction and wear resistance have been greatly improved to better meet engineering needs. However, the practical engineering applications of nanocrystalline metal materials still have great limitations, including their low ductility, low damage tolerance, low thermal stability and other shortcomings. Therefore, material scientists focus on developing new structural materials that combine the advantages of traditional metal materials and nanocrystalline metal materials. Cr...

Claims

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Application Information

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IPC IPC(8): C22F1/18C21D8/02C21D1/26C22F3/00
CPCC22F1/183C21D8/0247C21D8/0236C21D1/26C22F3/00C22C2200/04
Inventor 黄崇湘王明赛何琼郭凤娇
Owner SICHUAN UNIV
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