High-strength high-ductility biodegradable Zn-Mn-Mg series zinc alloy and preparation method thereof

A zn-mn-mg, biodegradable technology, applied in the field of composition design and preparation and processing of medical materials, can solve the problem of not providing data on the yield strength of zinc alloys, and achieve the effects of low cost, brittleness inhibition, and short process flow

Active Publication Date: 2018-09-28
北京尚宁科智医疗器械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent Document 9 does not provide data on the yield strength of the zinc alloy, and it can be inferred from the rule that the yield strength of

Method used

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  • High-strength high-ductility biodegradable Zn-Mn-Mg series zinc alloy and preparation method thereof
  • High-strength high-ductility biodegradable Zn-Mn-Mg series zinc alloy and preparation method thereof
  • High-strength high-ductility biodegradable Zn-Mn-Mg series zinc alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Composition, Preparation, Microstructure and Properties of High Strength and High Plasticity Zn-Mn-Mg Ternary Zinc Alloy.

[0064] The chemical composition of the zinc alloy is shown in Table 1-1, and the balance is Zn. The preparation process of the alloy is: vacuum directional solidification→extrusion. Using high-purity Zn blocks and high-purity Mn and Mg powders as raw materials, the vacuum degree of vacuum directional solidification is 2×10 -4 Pa, the heating temperature is 700°C, the standing time is 10 minutes, the cooling medium is liquid metal, and the pull-down speed is 50 μm / s.

[0065] The extrusion is carried out at 230° C., the extrusion speed is 2 mm / min, and the extrusion ratio is 16.

[0066] Samples were cut from the extruded rods of the zinc alloy to be tested for electrochemical corrosion, immersion corrosion, cytotoxicity and tensile mechanical properties at room temperature.

[0067] The preparation method of the electrochemical corrosion sample ...

Embodiment 2

[0079] Composition, Preparation, Microstructure and Properties of High Strength and High Plasticity Zn-Mn-Mg Quaternary Alloys.

[0080] The chemical composition of the zinc alloy is shown in Table 2-1, and the balance is Zn. The preparation process of the zinc alloy is: vacuum directional solidification→extrusion→two-stage heat treatment→cold rolling→drawing. Using high-purity Zn block, high-purity Mn, Mg, Cu, Ag, Fe, Ti powder and high-purity Na block as raw materials, the vacuum directional solidification and extrusion process follows the method provided in Example 1.

[0081] The first-stage heat treatment regime of the two-stage heat treatment is 380° C. for 3 hours, and the second-stage heat treatment is 120° C. for 20 minutes. Using transmission electron microscope and scanning electron microscope to observe the alloy structure after two-stage heat treatment, micron-sized MnZn with a size of 1-10 μm was observed 13 and Mg 2 Zn 11 Particles and nanoscale MnZn with a ...

Embodiment 3

[0094] Composition, preparation, microstructure and properties of high-strength and high-plasticity Zn-Mn-Mg series quinary alloys.

[0095] The chemical composition of the zinc alloy is shown in Table 3-1, and the balance is Zn. It uses high-purity Zn block and high-purity Mn, Mg, Ca, Sr, Ti, Cu, Ag powder as raw materials. The preparation process of the zinc alloy is: vacuum directional solidification→first extrusion→two-stage heat treatment→second extrusion→annealing (optional).

[0096] The vacuum degree of the vacuum directional solidification is 8×10 -3 Pa, the heating temperature is 750°C, the melt resting time is 8 minutes, the cooling medium is circulating cooling water whose temperature is maintained at 15±1°C, and the pull-down speed is 100μm / s.

[0097] The first extrusion is carried out at 260° C., the extrusion speed is 3 mm / min, and the extrusion ratio is 25.

[0098] The first-stage heat treatment system of the two-stage heat treatment is 380°C for 10 hours,...

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Abstract

The invention relates to high-strength high-ductility biodegradable Zn-Mn-Mg series zinc alloy and a preparation method. The alloy is prepared from the 0.02 to 0.49% of Mn and 0.001 to 0.3% of Mg, wherein Mn is a main alloying element, Mg is a secondary alloying element, and the Mn content is not lower than the Mg content in the alloy; at least one of Na, K, Ca, Sr, Ti, Fe, Cu and Ag elements is selected, the total content of the alloying elements added to the Zn-Mn-Mg series zinc alloy does not exceed 2%, and the balance is Zn. The basic preparation process of the zinc alloy comprises the steps of vacuum directional solidification and extrusion; on the basis of the steps, at least one of the following processing methods can be selected for processing again: two-stage heat treatment, extrusion, rolling, drawing and annealing. According to the preparation process, the processing plasticity of the zinc alloy can be given to the maximum, and multiphase multiscale directional tissues can be obtained, so that the alloy has excellent overall performance. The tensile mechanical properties of the zinc alloy at room temperature include the yield strength of 260 to 430 MPa, the tensile strength of 305 to 580 MPa and the elongation of 18.5 to 55%, and the zinc alloy is suitable for medical implants and is especially suitable for biodegradable stents.

Description

technical field [0001] The invention relates to the composition design, preparation method and application field of a high-strength and high-plastic biodegradable Zn-Mn-Mg zinc alloy, and belongs to the technical field of composition design, preparation and processing of medical materials. Background technique [0002] The degradation rate of pure zinc in the human body is between iron and magnesium, and it has been proved by animal experiments that it is an ideal medical degradable implant material. However, the mechanical properties of pure zinc are poor, and structural medical implants that need to bear a certain load cannot meet the design requirements. Alloying is one of the main means to improve the mechanical properties of pure zinc, and the added elements must be harmless to the human body. Appropriate amounts of manganese and magnesium are beneficial to the human body. Among them, manganese is an essential trace element for the human body. It constitutes several en...

Claims

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Application Information

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IPC IPC(8): C22C18/00C22C1/02C22F1/16
CPCC22C1/02C22C18/00C22F1/16
Inventor 石章智于静刘雪峰王鲁宁
Owner 北京尚宁科智医疗器械有限公司
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