Preparation method and application of 1100 aluminum alloy extruded material for medical apparatus and instruments

Abstract

The invention provides a preparation method of a 1100 aluminum alloy extruded material for a medical instrument. The preparation method comprises the following steps that a 1100 aluminum alloy cast ingot is subjected to homogenization treatment; the 1100 aluminum alloy cast ingot obtained after homogenization treatment is extruded, the heating temperature of extrusion ranges from 380 DEG C to 420 DEG C, the temperature of an extrusion container ranges from 380 DEG C to 420 DEG C, the temperature of a mold ranges from 380 DEG C to 420 DEG C, and the extrusion speed ranges from 0.8 mm / s to 1.0 mm / s; and the extruded aluminum alloy is stretched and straightened. In the preparation process of the 1100 aluminum alloy extruded material, the contents of Fe and Si elements are reasonably controlled, recrystallization is effectively inhibited, the recrystallization temperature is reduced, control over the grain size of the aluminum alloy is achieved, meanwhile, reasonable extrusion process parameters are set, the depth of a coarse grain layer is effectively reduced, the microstructure uniformity of the aluminum alloy is improved, and the surface quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloys, and in particular to a preparation method and application of an 1100 aluminum alloy extrusion material for medical devices. Background Art

[0002] 1100 aluminum alloy is ordinary industrial pure aluminum with an aluminum content of 99.0%. It cannot be strengthened by heat treatment and has low strength, but has good ductility, formability, weldability and corrosion resistance. 1100 aluminum alloy is also used in medical devices. For example, 1100 aluminum alloy can be used to prepare a certain part of a medical device. The device has extremely high requirements for the uniformity of the material structure and requires that the grain size of different parts of the same cross section is basically the same; at the same time, it is required to strictly control the depth of the coarse grain layer of the extruded material.

[0003] However, the purity of 1100 aluminum alloy is relatively high, and the depth of the coarse grain layer is difficult to control during the extrusion process, and the uniformity of the structure of the extruded material is also difficult to control. Therefore, in order to meet the application of 1100 aluminum alloy in medical devices, it is of great significance to provide a preparation method of 1100 aluminum alloy extrusion material for medical devices. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a method for preparing 1100 aluminum alloy extrusions for medical devices. The extrusions prepared by the preparation method provided in this application have the advantages of high uniformity of structure, high surface quality and low coarse-grained layer.

[0005] In view of this, the present application provides a method for preparing an 1100 aluminum alloy extrusion material for medical devices, comprising the following steps:

[0006] The 1100 aluminum alloy ingot is homogenized;

[0007] Extruding the homogenized 1100 aluminum alloy ingot, wherein the heating temperature of the extrusion is 380-420° C., the temperature of the extrusion barrel is 380-420° C., the temperature of the mold is 380-420° C., and the extrusion speed is 0.8-1.0 mm / s;

[0008] Stretching and straightening the extruded aluminum alloy;

[0009] The 1100 aluminum alloy ingot comprises: Si 0.10-0.20wt%, Fe 0.25-0.35wt%, Cu 0.05-0.20wt%, Ti 0.01-0.06wt%, Mn≤0.05wt%, Zn≤0.01wt%, and the balance is Al.

[0010] Preferably, the heating temperature of the homogenization treatment is 600-650° C., the insulation temperature is 580-620° C., and the insulation time is 3-5 hours.

[0011] Preferably, the heating temperature of the homogenization treatment is 630-640° C., the heating time is 1-h, the insulation temperature is 595-605° C., and the insulation time is 4h.

[0012] Preferably, the average grain size of the ingot after the homogenization treatment is 100-120 μm, and more than 90% of the grain boundary residual phase size is less than 10 μm.

[0013] Preferably, the heating temperature of the extrusion is 390-410° C., the temperature of the extrusion barrel is 390-410° C., the temperature of the mold is 390-410° C., and the extrusion speed is 0.8-0.9 mm / s.

[0014] Preferably, the depth of the coarse-grained layer of the aluminum alloy after extrusion is ≤2 mm.

[0015] Preferably, the grains in the height direction, the grains in the longitudinal section and the grains in the cross section of the aluminum alloy after extrusion are all equiaxed grains.

[0016] Preferably, the average grain size of the aluminum alloy after extrusion is 160-225 μm.

[0017] Preferably, the stretching ratio of the stretching straightening is less than 3.0%.

[0018] The present application also provides the use of the 1100 aluminum alloy prepared by the preparation method in medical devices.

[0019] The present application provides a method for preparing an 1100 aluminum alloy extrusion material for medical devices, which comprises the following steps: firstly, homogenizing an 1100 aluminum alloy ingot, then extruding the homogenized 1100 aluminum alloy ingot, limiting the heating temperature of the extrusion, the temperature of the extrusion barrel, the temperature of the mold and the extrusion speed, and finally stretching and straightening the extruded aluminum alloy; in the process of preparing the 1100 aluminum alloy extrusion material, the present application reasonably controls the content of Fe and Si elements, effectively inhibits recrystallization, reduces the recrystallization temperature, realizes the control of the grain size of the aluminum alloy, and simultaneously sets reasonable extrusion process parameters, effectively reduces the depth of the coarse grain layer, improves the uniformity of the aluminum alloy microstructure, and ensures the surface quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a polarized microstructure metallographic photograph of the aluminum alloy ingot after soaking treatment in an embodiment of the present invention;

[0021] Figure 2 The metallographic structure photos of the aluminum alloy ingot after soaking treatment at different magnifications in the embodiment of the present invention;

[0022] Figure 3is a histogram of the size distribution of the residual phase at the grain boundary of the aluminum alloy ingot after soaking treatment in an embodiment of the present invention;

[0023] Figure 4 The microstructure photos of the aluminum alloy product after extrusion in different directions in the embodiment of the present invention are shown in FIG. 1 , wherein: (a) TL (longitudinal section); (b) LT (transverse section); (c) ST (high direction);

[0024] Figure 5 The photos of the coarse grain depth in the head, middle and tail of aluminum alloy products at different extrusion speeds;

[0025] Figure 6 These are microstructure photos of aluminum alloy products in different directions when the extrusion speed is less than 0.8 mm / s. DETAILED DESCRIPTION

[0026] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0027] In view of the problem that the depth of the coarse-grained layer is difficult to control during the extrusion of 1100 aluminum alloy in the prior art, and the uniformity of the structure of the extruded material is difficult to control, the present application provides a method for preparing an 1100 aluminum alloy extruded material for medical devices, which improves the uniformity of the structure of the 1100 aluminum alloy extruded material by optimizing the alloy composition and the extrusion process, and realizes the control of the depth of the coarse-grained layer, while ensuring the surface quality of the 1100 aluminum alloy extruded material; specifically, the embodiment of the present invention discloses a method for preparing an 1100 aluminum alloy extruded material for medical devices, comprising the following steps:

[0028] The 1100 aluminum alloy ingot is homogenized;

[0029] Extruding the homogenized 1100 aluminum alloy ingot, wherein the heating temperature of the extrusion is 380-420° C., the temperature of the extrusion barrel is 380-420° C., the temperature of the mold is 380-420° C., and the extrusion speed is 0.5-1.0 mm / s;

[0030] Stretching and straightening the extruded aluminum alloy;

[0031] The 1100 aluminum alloy ingot comprises: Si 0.10-0.20wt%, Fe 0.25-0.35wt%, Cu 0.05-0.20wt%, Ti 0.01-0.06wt%, Mn≤0.05wt%, Zn≤0.01wt%, and the balance is Al.

[0032] In the preparation process of 1100 aluminum alloy extrusion material, the present application first limits the composition of 1100 aluminum alloy ingot, which includes: Si 0.10-0.20wt%, Fe 0.25-0.35wt%, Cu0.05-0.20wt%, Ti 0.04-0.06wt%, Mn≤0.05wt%, Zn≤0.01wt%, and the balance is Al; Fe and Si elements can effectively inhibit recrystallization and reduce the recrystallization temperature, but the content of Fe and Si elements is relatively high, and an Fe-rich equilibrium eutectic phase is easily formed at the grain boundary during the melting and casting process. The Fe-rich phase is difficult to reduce the size by means of ingot soaking, processing deformation, etc., but too much Fe-rich phase is easy to affect the use stability of the final product and affect the product quality; therefore, it is necessary to control the grain size of the product by reasonably controlling the content of Fe and Si elements. Specifically, the content of Si is 0.11wt%, 0.12wt%, 0.13wt%, 0.14wt%, 0.15wt%, 0.16wt%, 0.17wt%, 0.18wt%, 0.19wt%; the content of Fe is 0.26wt%, 0.27wt%, 0.28wt%, 0.29wt%, 0.30wt%, 0.31wt%, 0.32wt%, 0.33wt%, 0.34wt%. The content of Cu is 0.06wt%, 0.07wt%, 0.08wt%, 0.09wt%, 0.10wt%, 0.11wt%, 0.12wt%, 0.13wt%, 0.14wt%, 0.15wt%, 0.16wt%, 0.17wt%, 0.18wt%, 0.19wt%. The Ti content is 0.02wt%, 0.03wt%, 0.04wt%, and 0.05wt%.

[0033] After the raw materials are mixed according to the above-mentioned raw material ratio, they are loaded into the furnace, and then melted, slag-scraped, stirred, sampled at temperature, analyzed in front of the furnace, converted into a converter, refined in the furnace, left to stand, refined online, degassed, filtered, and cast in sequence; the above processes are all technical means well known to those skilled in the art, and this application does not impose any particular restrictions on their specific implementation means.

[0034] After casting, the obtained aluminum alloy ingot is subjected to homogenization treatment, and the heating temperature of the homogenization treatment is 600-650°C, the insulation temperature is 580-620°C, and the insulation time is 3-5h; specifically, the heating temperature of the homogenization treatment is 630-640°C, the insulation temperature is 595-605°C, and the insulation time is 4h; the above-mentioned homogenization treatment is conducive to obtaining a uniform and fine microstructure with an average grain size of 110μm, and a small size of the grain boundary residual phase, with more than 90% of the residual phase size less than 10μm.

[0035] The present application then extrude the homogenized 1100 aluminum alloy ingot, wherein the heating temperature of the extrusion is 380-420°C, the temperature of the extrusion barrel is 380-420°C, the temperature of the mold is 380-420°C, and the extrusion speed is 0.8-1.0 mm / s; specifically, the heating temperature of the extrusion is 390-410°C, the temperature of the extrusion barrel is 390-410°C, the temperature of the mold is 390-410°C, and the extrusion speed is 0.8-0.9 mm / s. By adjusting the above extrusion conditions, the present application can make the depth of the coarse grain layer of the aluminum alloy ≤2 mm, and the grains in the height direction, the grains in the longitudinal section, and the grains in the cross section are all equiaxed grains; the average grain size is 160-225 μm.

[0036] The present application finally performs stretching and straightening on the extruded aluminum alloy, and the stretching rate of the stretching and straightening is controlled within 3%.

[0037] The present application provides a method for preparing 1100 aluminum alloy extrusions, which controls the grain size of the aluminum alloy extrusions by optimizing the alloy composition and reasonably controlling the contents of Fe and Si elements; and by reasonably setting the extrusion process parameters, can effectively reduce the depth of the coarse-grained layer, improve the uniformity of the profile microstructure, and ensure the surface quality.

[0038] In order to further understand the present invention, the preparation method of the 1100 aluminum alloy extrusion material for medical devices provided by the present invention is described in detail below in conjunction with the embodiments. The protection scope of the present invention is not limited by the following embodiments.

[0039] Example

[0040] 1. Alloy composition design

[0041] The composition of the 1100 aluminum alloy in this embodiment is specifically shown in Table 1, and the Fe and Si contents are strictly controlled, Si+Fe<0.6wt%;

[0042] Table 1 Chemical composition data of 1100 aluminum alloy in the embodiment

[0043]

[0044] 2. Process flow

[0045] According to the composition of the aluminum alloy in Table 1 above, 1100 aluminum alloy extrusions are prepared, and the preparation process is as follows: batching calculation → preparation and charging → melting → slag removal, stirring, sampling at temperature, analysis in front of the furnace → converter → refining in the furnace → standing → online refinement, degassing, filtering → casting → sawing, soaking → ingot acceptance, wherein batching calculation → preparation and charging → melting → slag removal, stirring, sampling at temperature, analysis in front of the furnace → converter → refining in the furnace → standing → online refinement, degassing, filtering → casting → sawing are all operation means well known to those skilled in the art, and are not specifically described in this embodiment;

[0046] 3. Homogenization process

[0047] The homogenization process of heat treatment during the preparation of 1100 aluminum alloy ingot is shown in Table 2;

[0048] Table 2 1100 alloy ingot soaking system data table

[0049]

[0050] The polarized microstructure metallographic image of the 1100 alloy round ingot prepared according to the above soaking process is as follows: Figure 1 As shown in the figure, it can be seen that the grain structure of the aluminum alloy ingot after heat treatment is uniform, the grains are fine, and the average grain size is about 110μm.

[0051] Figure 2 , Figure 3 The following are the metallographic microstructure photos of 1100 alloy ingot at different magnifications and the size distribution histogram of the residual phase at the grain boundary of the ingot, among which: Figure 3 The figure includes two groups of bar graph data, which are the measurement data in two metallographic fields. It can be seen from the figure that the grain boundary residual phase size of the aluminum alloy ingot after heat treatment is small, and more than 90% of the residual phase size is less than 10μm.

[0052] 4. Extrusion process

[0053] The aluminum alloy ingot after soaking treatment is extruded by horizontal reverse extrusion equipment, and the specific extrusion process parameters are shown in Table 3;

[0054] Table 3 Extrusion process parameter data of aluminum alloy ingot

[0055] Ingot heating temperature / ℃ Extrusion barrel constant temperature / ℃ Mold temperature / ℃ Extrusion setting speed mm / s 400±10 400±10 400±10 0.8

[0056] 5. Stretch straightening

[0057] The extruded aluminum alloy products are stretched and straightened, and the stretching rate is controlled within 3.0%. Defects such as bending, gaps, and angle deviations that cannot be eliminated after stretching are further eliminated through finishing and straightening.

[0058] Table 4 is a table of low-magnification coarse-grained layers of extruded materials, Table 4 is a table of low-magnification coarse-grained rings

[0059]

[0060] It can be seen from Table 4 that the depth of the coarse-grained layer at the head and tail of the extruded material is ≤2mm.

[0061] Figure 4 Table 5 is the statistical table of grain size at different sampling positions of extruded materials;

[0062] Table 5 Statistics of grain size of extruded materials at different sampling locations

[0063]

[0064] It can be seen from the chart that the grains in different sections (height, longitudinal section, cross section) of the extruded material prepared by this extrusion process are all equiaxed crystals, and the difference in grain size is not obvious.

[0065] Comparative Example 1

[0066] The preparation method is the same as the above embodiment, except that the extrusion speed is adjusted to 1.1 mm / s, 1.3 mm / s, 1.5 mm / s, and 1.7 mm / s, respectively. Figure 5 As shown, Figure 5 The depth photos of the coarse grain layer in the head, middle and tail of aluminum alloy products at different extrusion speeds are shown in Figure 1. Figure 5 It can be seen that when the extrusion speed is greater than 1.0 mm / s, the depth of the coarse-grained layer of the extruded material is different at the head, middle and tail, and most of them are greater than 2.0 mm.

[0067] Comparative Example 2

[0068] The preparation method is the same as the above embodiment, except that the extrusion speed is less than 0.8 mm / s. Figure 6 As shown, Figure 6 These are microstructure photos of aluminum alloy products in different directions when the extrusion speed is less than 0.8 mm / s. It can be seen from the figure that the grains of aluminum alloy products in different directions are quite different.

[0069] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0070] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing 1100 aluminum alloy extrusion material for medical devices, comprising the following steps: The 1100 aluminum alloy ingot is homogenized; Extruding the homogenized 1100 aluminum alloy ingot, wherein the heating temperature of the extrusion is 380-420° C., the temperature of the extrusion barrel is 380-420° C., the temperature of the mold is 380-420° C., and the extrusion speed is 0.8-1.0 mm / s; Stretching and straightening the extruded aluminum alloy; The 1100 aluminum alloy ingot comprises: Si 0.10-0.20wt%, Fe 0.25-0.35wt%, Cu 0.05-0.20wt%, Ti 0.01-0.06wt%, Mn≤0.05wt%, Zn≤0.01wt%, and the balance is Al.

2. The preparation method according to claim 1, characterized in that: The heating temperature of the homogenization treatment is 600-650° C., the insulation temperature is 580-620° C., and the insulation time is 3-5 hours.

3. The preparation method according to claim 1 or 2, characterized in that: The heating temperature of the homogenization treatment is 630-640° C., the heating time is 1-h, the insulation temperature is 595-605° C., and the insulation time is 4h.

4. The preparation method according to claim 3, characterized in that: The average grain size of the ingot after the homogenization treatment is 100-120 μm, and the size of more than 90% of the grain boundary residual phase is less than 10 μm.

5. The preparation method according to claim 1, characterized in that: The heating temperature of the extrusion is 390-410° C., the temperature of the extrusion barrel is 390-410° C., the temperature of the mold is 390-410° C., and the extrusion speed is 0.8-0.9 mm / s.

6. The preparation method according to claim 1 or 5, characterized in that: The coarse grain layer depth of the extruded aluminum alloy is ≤2 mm.

7. The preparation method according to claim 1, characterized in that: The grains in the height direction, the grains in the longitudinal section and the grains in the cross section of the aluminum alloy after extrusion are all equiaxed grains.

8. The preparation method according to claim 1, characterized in that: The average grain size of the aluminum alloy after extrusion is 160 to 225 μm.

9. The preparation method according to claim 1, characterized in that: The stretching ratio of the stretching straightening is less than 3.0%.

10. Use of the 1100 aluminum alloy prepared by the preparation method according to any one of claims 1 to 9 in medical devices.

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