A method for preparing high-quality pure titanium plate from titanium sponge

Abstract

The present invention discloses a method for preparing a high-quality pure titanium plate from sponge titanium, and belongs to the technical field of preparing pure titanium plates. The method for preparing a high-quality pure titanium plate from sponge titanium of the present invention comprises the following steps: pressing the sponge titanium and hot rolling it in an oxygen-free environment to obtain the high-quality pure titanium plate. The process of the present invention is simple, the flow is short, and the cost is low. The plate can be rolled after the sponge titanium is rolled into blocks. There is no need to melt the sponge titanium at high temperature and cast ingots, which eliminates the process of forging the ingots, reduces time costs, and reduces energy loss. It is a new method for preparing pure titanium plates with a short process and high efficiency. In addition, the pure titanium plate prepared by the present invention has excellent strength and relatively good plasticity.

Description

Technical Field

[0001] The invention relates to the technical field of pure titanium plate preparation, in particular to a method for preparing high-quality pure titanium plates from titanium sponge. Background Art

[0002] Pure titanium has been widely used in biomedicine, aerospace, automobile, biology and other fields due to its low density, high specific strength and specific stiffness, good corrosion resistance, especially good high temperature durability and excellent biocompatibility.

[0003] The traditional preparation of pure titanium plates requires melting titanium sponge at high temperature into titanium ingots, then forging and pulling the blanks on a hydraulic press, and finally preparing pure titanium plates through hot rolling and cold rolling processes. Therefore, the traditional preparation process has problems such as cumbersome production process and high production cost, which is not conducive to the widespread use of pure titanium plates. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing high-quality pure titanium plates from sponge titanium to solve the problems existing in the above-mentioned prior art. The method of the present invention does not require processes such as melting and blanking, which greatly shortens the process flow and reduces production costs. The production cost of pure titanium plates produced by the method of the present invention is less than 1 / 2 of that of traditional processes, and the quality of titanium plates is comparable to that of traditional processes, and can be widely used in various civilian industries, such as pure titanium bipolar plates for hydrogen fuel cells, pure titanium handicrafts and daily necessities, etc.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] One of the technical solutions of the present invention: A method for preparing high-quality pure titanium plates from titanium sponge, comprising the following steps:

[0007] The titanium sponge is pressed and then hot-rolled in an oxygen-free environment to obtain the high-quality pure titanium plate.

[0008] After pressing the titanium sponge, it is sealed and welded in a shell made of titanium plate to isolate oxygen and avoid the introduction of impurities, especially oxygen, during the hot rolling process, which would cause the performance of the titanium plate to deteriorate.

[0009] Furthermore, the density of the titanium sponge after pressing is ≥85% (to ensure the control of pores in the subsequent rolling process).

[0010] Furthermore, the titanium sponge includes grade 0 titanium sponge.

[0011] Furthermore, the hot rolling treatment in an oxygen-free environment includes hot rolling treatment in an inert atmosphere, or hot rolling treatment after the titanium sponge is pressed and sealed in a shell made of a titanium plate (the titanium plate is a standard part with a thickness of about 2 mm).

[0012] Furthermore, the thickness of the pressed titanium sponge is 31-41 mm; the thickness ratio of the pressed titanium sponge to the titanium plate is (31-41):2.

[0013] Furthermore, the hot rolling treatment specifically includes: heating to 900-1100° C., keeping the temperature for 30-60 minutes and then hot rolling, with a deformation amount of 20-40% in each pass, until the thickness of the plate is 1-4 mm.

[0014] Furthermore, during the hot rolling process, the deformation amount of the first pass is 20%, and the deformation amount of the subsequent passes is changed to 40% until the total deformation amount reaches 75%, and then the deformation amount of the passes is reduced to 20% until the total deformation amount reaches 90-98%.

[0015] Furthermore, the method further comprises cold rolling the product obtained by the hot rolling treatment, and directly achieving a total deformation of 50-80% to obtain the high-quality pure titanium plate.

[0016] Furthermore, the deformation amount of each cold rolling process is 2-8%.

[0017] The second technical solution of the present invention: a high-quality pure titanium plate prepared by the above method.

[0018] The third technical solution of the present invention: an application of the above-mentioned high-quality pure titanium plate in the preparation of hydrogen fuel cell bipolar plates, handicrafts or daily necessities.

[0019] The present invention discloses the following technical effects:

[0020] The process of the present invention is simple, short and low in cost. The plate can be rolled after the titanium sponge is rolled into blocks. The titanium sponge does not need to be melted at high temperature and cast into ingots, which saves the process of forging the ingots, reduces time cost and energy loss, and is a new method for preparing pure titanium plates with short process and high efficiency. The pure titanium plate prepared by the present invention has excellent strength and relatively good plasticity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a physical picture of the extruded titanium sponge block (before grinding) obtained in Example 1 of the present invention when the oil cylinder pressure is 10 MPa and the pressure holding time is 2 minutes;

[0023] Figure 2 This is a physical picture of a plate with a thickness of 4 mm obtained in Example 1 of the present invention;

[0024] Figure 3 This is a physical picture of a plate with a thickness of 2 mm obtained in Example 2 of the present invention;

[0025] Figure 4 This is a diagram of mechanical properties of a plate with a thickness of 2 mm obtained in Example 2 of the present invention;

[0026] Figure 5 This is a physical picture of the extruded titanium sponge block (before grinding) obtained in Example 3 of the present invention when the cylinder pressure is 15 MPa and the pressure holding time is 4 minutes;

[0027] Figure 6 This is a physical picture of a pure titanium sheet with a thickness of 0.5 mm obtained in Example 3 of the present invention. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0029] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0030] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0031] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present application description and examples are exemplary only.

[0032] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0033] Example 1

[0034] A method for preparing high-quality pure titanium plates from titanium sponge:

[0035] (1) 250 g of grade 0 titanium sponge was placed in a mold and pressed with a 400T hydraulic press. The cylinder pressure was 10 MPa and the pressure holding time was 2 min. The mold was removed to obtain an extruded titanium sponge block with a density of 85%. The actual picture of the extruded titanium sponge block is shown in Figure 1 .

[0036] (2) Grinding the extruded titanium sponge block into a titanium sponge block with a regular shape.

[0037] (3) The titanium sponge block is placed in a shell made of a pure titanium plate (the shell thickness is about 2 mm), and the pure titanium plate shell is completely welded using an argon arc welding process.

[0038] (4) The sealed titanium sponge block (thickness 40 mm) was placed in a muffle furnace for heating at a temperature of 1100° C. for a holding time of 30 min.

[0039] (5) The sample heated in step (4) is rolled on a two-roll mill, and the deformation amount of the first pass during rolling is 20%, and the deformation amount of the subsequent passes is changed to 40%, until the total deformation amount reaches 75%, and then the deformation amount of the passes is reduced to 20%, until the thickness of the block becomes 4 mm, that is, a plate with a thickness of 4 mm is obtained. Finally, the plate is placed in a furnace and cooled to room temperature with the furnace. The actual picture of the 4 mm plate is shown in FIG. Figure 2 .

[0040] The plate obtained in this embodiment was subjected to room temperature tensile test verification, and it was determined that the yield strength was 250 MPa, the tensile strength was 380 MPa, and the elongation was 18%.

[0041] Example 2

[0042] A method for preparing high-quality pure titanium plates from titanium sponge:

[0043] (1) 250 g of grade 0 titanium sponge was placed in a mold and pressed with a 400T hydraulic press. The cylinder pressure was 15 MPa and the pressure holding time was 2 min. The mold was removed to obtain an extruded titanium sponge block with a density of about 95%.

[0044] (2) Grinding the extruded titanium sponge block into a titanium sponge block with a regular shape.

[0045] (3) The titanium sponge block is placed in a shell made of a pure titanium plate (the shell thickness is about 2 mm), and the pure titanium plate shell is completely welded using an argon arc welding process.

[0046] (4) The sealed titanium sponge block (thickness 45 mm) was placed in a muffle furnace for heating at a temperature of 900° C. for a holding time of 60 min.

[0047] (5) The sample heated in step (4) is rolled on a two-roll rolling mill, and the deformation amount of the first pass during rolling is 20%, and the deformation amount of the subsequent passes is changed to 40%, until the total deformation amount reaches 75%, and then the deformation amount of the passes is reduced to 20%, until the thickness of the block becomes 2 mm, that is, a plate with a thickness of 2 mm is obtained, and finally the plate is placed in a furnace and cooled to room temperature with the furnace. The actual picture of the plate with a thickness of 2 mm is shown in FIG. Figure 3 , mechanical properties diagram see Figure 4 .

[0048] The plate obtained in this embodiment was subjected to room temperature tensile test verification, and the yield strength was determined to be 298 MPa, the tensile strength was 420 MPa, and the elongation was 14%.

[0049] Example 3

[0050] A method for preparing high-quality pure titanium plates from titanium sponge:

[0051] (1) 250 g of grade 0 titanium sponge was placed in a mold and pressed with a 400T hydraulic press. The cylinder pressure was 15 MPa and the pressure holding time was 4 min. The mold was removed to obtain an extruded titanium sponge block with a density of about 98%. The actual picture of the extruded titanium sponge block is shown in Figure 5 .

[0052] (2) Grinding the extruded titanium sponge block into a titanium sponge block with a regular shape.

[0053] (3) The titanium sponge block is placed in a shell made of a pure titanium plate (the shell thickness is about 2 mm), and the pure titanium plate shell is completely welded using an argon arc welding process.

[0054] (4) The sealed titanium sponge block (thickness 35 mm) was placed in a muffle furnace for heating at a temperature of 900° C. for a holding time of 60 min.

[0055] (5) The sample heated in step (4) is rolled on a two-roll rolling mill, wherein the deformation amount of the first pass during rolling is 20%, and the deformation amount of the subsequent passes is changed to 40%, until the total deformation amount reaches 75%, and then the deformation amount of the passes is reduced to 20%, until the thickness of the block becomes 1 mm, that is, a plate with a thickness of 1 mm is obtained, and finally the plate is placed in a furnace and cooled to room temperature with the furnace.

[0056] (6) The oxide scale of the plate obtained in step (5) is removed, and cold rolling is performed at room temperature on a two-roll cold rolling mill, with a cold rolling pass deformation of 5%, until the hot-rolled plate with a thickness of 1 mm is rolled into a pure titanium sheet with a thickness of 0.5 mm. The actual picture of the pure titanium sheet is shown in FIG. Figure 6 .

[0057] The pure titanium thin plate obtained in this embodiment was subjected to room temperature tensile test verification, and it was determined that the yield strength was 320 MPa, the tensile strength was 450 MPa, and the elongation was 10%.

[0058] Example 4

[0059] A method for preparing high-quality pure titanium plates from titanium sponge:

[0060] (1) 250 g of grade 0 titanium sponge was placed in a mold and pressed with a 400T hydraulic press. The cylinder pressure was 15 MPa and the pressure holding time was 4 min. The mold was removed to obtain an extruded titanium sponge block with a density of about 98%.

[0061] (2) Grinding the extruded titanium sponge block into a titanium sponge block with a regular shape.

[0062] (3) The titanium sponge block is placed in a shell made of a pure titanium plate (the shell thickness is about 2 mm), and the pure titanium plate shell is completely welded using an argon arc welding process.

[0063] (4) The sealed titanium sponge block (thickness 35 mm) was placed in a muffle furnace for heating at a temperature of 900° C. for a holding time of 60 min.

[0064] (5) The sample heated in step (4) is rolled on a two-roll rolling mill, wherein the deformation amount of the first pass during rolling is 20%, and the deformation amount of the subsequent passes is changed to 40%, until the total deformation amount reaches 75%, and then the deformation amount of the passes is reduced to 20%, until the thickness of the block becomes 1 mm, that is, a plate with a thickness of 1 mm is obtained, and finally the plate is placed in a furnace and cooled to room temperature with the furnace.

[0065] (6) removing the oxide scale of the plate obtained in step (5), and performing cold rolling at room temperature on a two-roll cold rolling mill, with a cold rolling pass deformation of 2%, until the hot-rolled plate with a thickness of 1 mm is rolled into a pure titanium sheet with a thickness of 0.2 mm.

[0066] The pure titanium thin plate obtained in this embodiment was subjected to room temperature tensile test verification, and the yield strength was determined to be 340 MPa, the tensile strength was 480 MPa, and the elongation was 7%.

[0067] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for preparing high-quality pure titanium plate from titanium sponge, characterized in that: The following steps are involved: After pressing the titanium sponge, hot rolling is performed in an oxygen-free environment to obtain the high-quality pure titanium plate; The density of the titanium sponge after pressing is ≥95%; the titanium sponge includes grade 0 titanium sponge; The hot rolling treatment in an oxygen-free environment includes hot rolling treatment in an inert atmosphere, or hot rolling treatment after the titanium sponge is pressed and sealed in a shell made of a titanium plate; The thickness of the pressed titanium sponge is 31-41 mm; the thickness ratio of the pressed titanium sponge to the titanium plate is (31-41):2; The hot rolling treatment specifically includes: heating to 900-1100° C., keeping the temperature for 30-60 minutes and then hot rolling, with the deformation amount of each pass being 20-40% until the total deformation amount reaches 90-98%.

2. The method according to claim 1, characterized in that The method further comprises cold rolling the product obtained by hot rolling, and the direct total deformation reaches 50-80% to obtain the high-quality pure titanium plate.

3. The method according to claim 2, characterized in that The deformation amount of each cold rolling process is 2-8%.

4. Use of a high-quality pure titanium plate prepared by the method according to any one of claims 1 to 3 in the preparation of hydrogen fuel cell bipolar plates, handicrafts or daily necessities.

Images