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Zn-Mg biphasic heterogeneous material and preparation method thereof

A zn-mg, dissimilar technology, applied in the field of Zn-Mg biphasic heterogeneous materials and its preparation, can solve the problems of high elastic modulus and obvious stress shielding effect

Active Publication Date: 2021-03-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the second problem of the existing Zn-Mg alloy is: the elastic modulus is high, and the stress shielding effect is obvious

Method used

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  • Zn-Mg biphasic heterogeneous material and preparation method thereof
  • Zn-Mg biphasic heterogeneous material and preparation method thereof
  • Zn-Mg biphasic heterogeneous material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Preparation of Zn-Mg dual-phase heterogeneous material by variable temperature accumulative rolling + recrystallization gap annealing

[0021] The preparation process route is: laminated billets→variable temperature accumulative stack rolling→recrystallization gap annealing→deep processing into devices. The specific instructions are as follows:

[0022] (1) Stacked blanks: First, mechanically polish the 0.5-10mm thick zinc plate (see Table 1-1 for composition) and 0.1-2mm thick magnesium plate (see Table 1-2 for composition) to obtain a clean surface, and then Fold them together, wrap and seal with aluminum foil.

[0023] (2) Variable-temperature accumulative stack rolling: heat the above-mentioned billets at 320-380° C. for 1-30 minutes, and then carry out the first rolling pass, with the reduction of each pass being 40%-80%. Cut the obtained Zn / Mg composite plate from the middle into two plates of equal length, mechanically polish the surface, stack and f...

Embodiment 2

[0030]Example 2: Preparation of Zn-Mg dual-phase heterogeneous material by variable temperature accumulative extrusion + recrystallization gap annealing

[0031] The preparation process route is: laminated billets→variable temperature accumulative extrusion→recrystallization gap annealing→deep processing into devices. The specific instructions are as follows:

[0032] (1) Stacked billets: pickling all Zn and Mg rods and pipes before stacking billets to obtain a clean surface. The center is a Mg rod with a diameter of 5-10mm, and zinc tubes with a wall thickness of 1-5mm are laminated in the order from the core to the outer layer Mg / Zn / Mg / Zn... (see Table 1-1 for composition) and Magnesium tubes with a wall thickness of 0.1 to 1 mm (see Table 1-2 for composition) form a multi-layer ring sleeve assembly. The number of layers of the multi-layer ring sleeve assembly is 2 to 10 layers.

[0033] (2) Accumulative extrusion with variable temperature: The above-mentioned billets are...

Embodiment 3

[0036] Embodiment 3: Performance test of Zn-Mg two-phase heterogeneous material and its comparison material

[0037] Performance tests were performed on the Zn-Mg biphasic heterogeneous materials prepared in Examples 1 and 2. Tensile samples were prepared according to the national standard GB / T228.1-2010 "Metallic Materials Tensile Test Part 1, Room Temperature Test Method", and the measured yield strength was >250MPa, tensile strength >300MPa, and elongation >20%. The hardness measured by the Vickers hardness tester model HV-1000 is >80HV. According to American Standard ASTM G31-2012 "Standard Guide for Laboratory Immersion Corrosion Testing of Metals", the degradation rate of the material in Hank's solution at 37°C is 30-500 μm / year. According to the national standard GB / T 22315-2008 "Metallic Materials. Elastic Modulus and Poisson's Ratio Test Method", the elastic modulus is 60-90GPa. The alloy extract was prepared according to the national standard GB / T16886.5-2017 "Biol...

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Abstract

The invention discloses a Zn-Mg biphasic heterogeneous material and a preparation method thereof. The material is composed of Zn phases and Mg phases, the Zn phases are pure zinc or zinc alloys, the volume fraction of the Zn phases is 30%-99%, the grain size is smaller than or equal to 5 [mu]m, the Mg phases are pure magnesium or magnesium alloys, the Mg phases account for the remaining volume fraction, and the grain size is smaller than or equal to 10 [mu]m; the Mg phases are discontinuously distributed in the Zn phases, the size of the Mg phases is smaller than or equal to 50 [mu]m, and thedistance between every two adjacent Mg phases is larger than or equal to 50 nm; and the small Zn grains surround the large Mg grains. Compared with zinc alloy, the elastic modulus is obviously reduced, the stress shielding effect on bone tissue is reduced, and bone healing is facilitated. According to the material, Zn<2+> and Mg<2+> ions are separated out from the Zn phases and the Mg phases respectively, so that the concentration difference of the Zn phases and the Mg phases in surrounding bone tissues is realized, the osteogenesis promoting biological effect of the Zn phases and the Mg phases is maximized, the micro-roughness of the surfaces of the Mg phases and the Zn phases can be maintained in an in-vivo degradation process, and the material is more suitable for osteogenesis-related cells. The material can effectively avoid local swelling caused by the fact that release of a large amount of hydrogen exceeds the tissue removal capacity in a short time in the degradation process ofthe magnesium alloy.

Description

technical field [0001] The invention belongs to the field of nonferrous metal preparation and processing, and in particular relates to a Zn-Mg two-phase heterogeneous material and a preparation method thereof. Background technique [0002] With the increasing demand for degradable orthopedic implant materials, medical biodegradable metal materials represented by the essential elements magnesium, zinc and their alloys have attracted great attention in recent years. Magnesium has excellent osteogenic properties, can participate in the activation of various enzymes in the human body, reduce the excitability of the nervous system, and participate in protein synthesis. The phase structure of the existing zinc alloy is that the second phase of intermetallic compound (IM) is distributed in the Zn matrix, which is called Zn-IM structure for short. Specific to Zn-Mg alloys, IM includes Mg 2 Zn 11 , MgZn 2 Wait. With the increase of Mg content, the plasticity of Zn-Mg alloy decre...

Claims

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Application Information

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IPC IPC(8): C22C18/00C22C23/04C22F1/06C22F1/16C21D1/26A61L31/14A61L31/02A61L27/58A61L27/04
CPCA61L27/047A61L27/58A61L31/022A61L31/148A61L2430/02C21D1/26C22C18/00C22C23/04C22F1/06C22F1/165
Inventor 石章智陈虹廷孙疆游明乐
Owner UNIV OF SCI & TECH BEIJING
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