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Preparation method of high-performance medical magnesium alloy thin-wall pipes

A technology for thin-walled pipes and magnesium alloy pipes, which is applied in the field of metal material processing, can solve the problems of restricting the popularization and application of magnesium alloy thin-walled pipes, difficult production of long thin-walled pipes, cumbersome operations, etc., and achieves good surface quality and easy processing and forming. , the effect of simple process equipment

Active Publication Date: 2018-07-10
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, methods such as reciprocating extrusion and equal channel angular extrusion can be used to prepare magnesium alloy pipes with a wall thickness not greater than 0.3mm. Although these methods can effectively improve the structure and properties of magnesium alloy materials, they are cumbersome to operate and require turning or rotating devices. , and it is difficult to produce long thin-walled pipes with low efficiency and high cost, which greatly limits the popularization and application of magnesium alloy thin-walled pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] Its concrete preparation steps are as follows:

[0015] Step 1: After inserting the mandrel coated with graphite emulsion lubricant into the magnesium alloy tube, perform multi-pass hot spinning processing at 350 ° C ~ 450 ° C, the total deformation is not less than 50%, and the outer diameter is 5.5 ~ Magnesium alloy tube billets with a thickness of 10.0mm and a wall thickness of 0.5-1.5mm;

[0016] Step 2: Clean the surface of the magnesium alloy tube blank, and then undergo 5 to 20 passes of long core rod drawing or long core rod drawing combined with empty drawing to form an outer diameter of 1.5 to 5.0 mm and a wall thickness of 0.1 to 0.3 mm medical magnesium alloy thin-walled tubing, the deformation of each pass is 5-20%, the drawing speed is 1-5m / min, vegetable oil is used as a lubricant during the drawing process, and vacuum annealing is carried out 3-12 times , the annealing temperature is 300-400°C, and the annealing time is 1h.

Embodiment 1

[0019] The invention prepares AZ31 magnesium alloy thin-wall pipes with an outer diameter of 5.0 mm and a wall thickness of 0.3 mm.

[0020] After inserting the mandrel coated with graphite emulsion lubricant into an AZ31 magnesium alloy tube with an outer diameter of 12.0mm and a wall thickness of 2.0mm, a second pass of hot spinning was performed at 350°C, with a total deformation of 72.5%. AZ31 magnesium alloy tube billet with an outer diameter of 6.5mm and a wall thickness of 1.1mm; AZ31 magnesium alloy tube blanks are surface cleaned and then drawn with a long core rod for 7 times to have an outer diameter of 5.0mm and a wall thickness of 0.3mm Medical AZ31 magnesium alloy thin-walled pipes, the deformation of each pass is between 5 and 20%, the drawing speed is 1m / min, vegetable oil is used as a lubricant during the drawing process, and vacuum annealing is carried out 4 times, vacuum The annealing temperature is 400°C, and the annealing time is 1h.

Embodiment 2

[0022] The invention prepares Mg-Zn-Gd magnesium alloy thin-walled tubes with an outer diameter of 3.0 mm and a wall thickness of 0.1 mm.

[0023] Insert the mandrel coated with graphite emulsion lubricant into a Mg-Zn-Gd magnesium alloy tube with an outer diameter of 9.8 mm and a wall thickness of 1.8 mm, and then perform two-pass hot spinning at 400 °C, with a total deformation of 68 %, to obtain a Mg-Zn-Gd magnesium alloy tube billet with an outer diameter of 6.0 mm and a wall thickness of 0.9 mm; the Mg-Zn-Gd magnesium alloy tube billet was cleaned by surface cleaning, and then drawn by 12 passes of long mandrel. For medical Mg-Zn-Gd magnesium alloy thin-walled pipes with an outer diameter of 3.0mm and a wall thickness of 0.1mm, the deformation of each drawing is between 5 and 20%, and the drawing speed is 5m / min. Vegetable oil was used as lubricant in the method, and vacuum annealing was carried out 8 times, the vacuum annealing temperature was 400°C, and the annealing ti...

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PUM

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Abstract

The invention provides a preparation method of high-performance medical magnesium alloy thin-wall pipes. The preparation method is characterized in that small-size magnesium alloy pipe blanks are prepared through a hot-swage method, after the magnesium alloy pipe blanks are subjected to surface cleaning, multi-pass drawing is directly carried out, necessary intermediate annealing treatment is usedin assistance, and therefore the high-performance medical magnesium alloy thin-wall pipes are obtained. The small-size magnesium alloy pipe blanks are prepared through the hot-swage method, the magnesium alloy pipe blanks are directly drawn, and the thin-wall pipes are formed. Technological equipment is simple, forming is easy, the quality of the alloy pipes can be effectively improved, the yieldof the alloy pipes can be effectively increased, and the obtained magnesium alloy thin-wall pipes are uniform in wall thickness, high in dimensional precision and good in surface quality.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a method for preparing a high-performance medical magnesium alloy thin-walled pipe. Background technique [0002] Interventional stents have the advantages of supporting stenotic and occluded vessels, reducing elastic recoil and reshaping of vessels, and maintaining smooth blood flow in the lumen, and have attractive application prospects in the field of cardiovascular treatment. Magnesium alloy is an ideal material for making interventional stents due to its significant advantages such as degradability, good biocompatibility, low thrombogenicity, low inflammatory response, and mechanical properties close to human bone in the human body. However, magnesium alloy has a close-packed hexagonal crystal structure and poor deformation processing ability, so it is very difficult to manufacture interventional stents with it. Obtaining thin-walled tubing with high quali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06C22F1/06C22F1/02
CPCB21C37/06C22F1/02C22F1/06
Inventor 甘春雷王顺成黎小辉郑开宏周楠李继林
Owner GUANGDONG INST OF NEW MATERIALS