High-plasticity rapidly-degradable magnesium alloy and preparation method thereof

A rapid degradation, magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of poor deformation ability and plasticity, and achieve the effects of improving comprehensive performance, plasticity, strength and plasticity

Inactive Publication Date: 2022-03-11
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to solve the problems of poor plasticity and poor deformation ability of the existing magnesium alloy materials used to manufacture fracturing tools, and to provide a high-plasticity rapidly degradable magnesium alloy and its preparation method

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] A high plasticity rapidly degradable magnesium alloy, the preparation method of which is:

[0023] (1) Use pure magnesium, Mg-Gd master alloy, and Mg-Cu master alloy as raw materials, and make ingredients according to the magnesium alloy composition. The magnesium alloy includes the following components in weight percentage: Gd 3.0%, Cu 0.96%, and the balance is Mg.

[0024] (2) After the surface of the raw material is fully polished, it is smelted. First heat up to 750°C, in SF 6 and CO 2 Melting is carried out under the protection of a mixed gas, fully stirred after melting, left to stand, cooled to 720°C and kept for 25 minutes, and finally cooled in a brine bath to obtain an ingot.

[0025] (3) Heat the prepared alloy ingot at 400°C for 10 hours to fully eliminate casting defects.

[0026] (4) The homogenized alloy was preheated at 400°C for 30 minutes, the extrusion temperature was 400°C, the extrusion ratio was 11, and it was formed by one extrusion.

[002...

Embodiment 2

[0029] A high plasticity rapidly degradable magnesium alloy, the preparation method of which is:

[0030] (1) Use pure magnesium, Mg-Gd master alloy, Mg-Cu master alloy, and Mg-Zr master alloy as raw materials, and make ingredients according to the magnesium alloy composition. The magnesium alloy includes the following components by weight percentage: Gd 2.95%, Cu 0.89%, Zr 0.11%, and the balance is Mg.

[0031] (2) After the surface of the raw material is fully polished, it is smelted. First heat up to 750°C, in SF 6 and CO 2 Melting is carried out under the protection of a mixed gas, fully stirred after melting, left to stand, cooled to 720°C and kept for 25 minutes, and finally cooled in a brine bath to obtain an ingot.

[0032] (3) Heat the prepared alloy ingot at 400°C for 10 hours to fully eliminate casting defects.

[0033] (4) The homogenized alloy was preheated at 420°C for 30 minutes, the extrusion temperature was 420°C, the extrusion ratio was 28, and it was f...

Embodiment 3

[0036] A high plasticity rapidly degradable magnesium alloy, the preparation method of which is:

[0037] (1) Use pure magnesium, Mg-Gd master alloy, Mg-Cu master alloy, and Mg-Zr master alloy as raw materials, and make ingredients according to the magnesium alloy composition. The magnesium alloy includes the following components by weight percentage: 3.7% Gd, 0.97% Cu, 0.38% Zr, and the balance is Mg.

[0038] (2) After the surface of the raw material is fully polished, it is smelted. First heat up to 750°C, in SF 6 and CO 2 Melting is carried out under the protection of a mixed gas, fully stirred after melting, left to stand, cooled to 720°C and kept for 25 minutes, and finally cooled in a brine bath to obtain an ingot.

[0039] (3) Heat the prepared alloy ingot at 400°C for 10 hours to fully eliminate casting defects.

[0040] (4) The homogenized alloy was preheated at 420°C for 30 minutes, the extrusion temperature was 420°C, the extrusion ratio was 28, and it was fo...

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Abstract

The invention discloses a high-plasticity rapidly-degradable magnesium alloy and a preparation method thereof. The high-plasticity rapid degradation magnesium alloy comprises the following components in percentage by weight: 1-6% of Gd; 0.05 to 2 percent of Cu; and the balance of Mg and inevitable impurities. The preparation method comprises the following steps: (1) burdening according to magnesium alloy components; (2) in the smelting process, CO2 and SF6 are adopted as protective gas, the temperature is increased to 720-750 DEG C, then heat preservation is conducted, after all the raw materials are smelted, the temperature is reduced to 700-720 DEG C, standing and heat preservation are conducted for 25-30 min, the raw materials are taken out, salt bath water cooling is conducted, and an alloy cast ingot is obtained; (3) the prepared alloy cast ingot is subjected to homogenization treatment for 4-12 h at the temperature of 400-440 DEG C; and (4) the cast ingot is preheated for 30 min at the temperature of 350-430 DEG C, and one-time extrusion forming is conducted according to the extrusion ratio of 11-28. The mechanical property and the degradation rate of the prepared magnesium alloy are obviously improved, the use requirements of fracturing tools are met, the magnesium alloy can be widely applied to the field of energy mining such as oil and gas mining, the mining difficulty is reduced, and the mining efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of magnesium alloys, in particular to a high-plasticity rapidly degradable magnesium alloy and a preparation method thereof. Background technique [0002] With the development of my country's economy, the demand for energy such as oil and natural gas is also increasing. my country's shale gas reserves rank first in the world, and oil shale ranks fourth in the world. The exploitation of shale gas is difficult, and hydraulic fracturing technology is an effective method to improve its exploitation efficiency and save exploitation cost. [0003] After the traditional fracturing operation is completed, the fracturing tools such as fracturing balls and bridge plugs need to be drilled through drilling tools, and then returned to the ground. During the flowback process, unsuccessful flowback such as stuck balls is often encountered, resulting in shortened service life of oil wells, increased production difficulty ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C23/00C22C1/03C22F1/06B21C23/00
CPCC22C23/06C22C23/00C22F1/06C22C1/03B21C23/002
Inventor 王敬丰马凯代朝能王丹芊王叶王金星潘复生
Owner CHONGQING UNIV
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