Preparation method of high porosity ultra-thin metal titanium plate

Abstract

The application provides a preparation method of a high-porosity ultra-thin metal titanium plate, comprising the following steps: raw material preparation: uniformly mixing titanium powder and a pore-forming agent as raw material powder for standby; first rolling: weighing the raw material powder required for a single green body, and rolling the weighed raw material powder through a rolling mill to obtain a green body; sintering forming: sintering the green body to obtain a formed body; second rolling: second rolling of the formed body through a rolling mill to obtain the metal titanium plate. By adding a cleaning brush to the driving roller to control the surface finish of the roller, the raw material powder is uniformly fed from the roller inlet, a large-size high-porosity ultra-thin metal titanium plate with a thickness less than 0.29 mm, a porosity greater than or equal to 65%, and a width of 300-500 mm and good air permeability is prepared, and the limitation of the rolling process on the thickness uniformity and the porosity uniformity of the large-size porous plate is solved. The powder rolling process is optimized, and the flexibility and controllability of the powder rolling process are improved.

Description

Technical Field

[0001] This invention relates to the processing of porous metal materials, and particularly to a method for preparing a high-porosity ultrathin titanium plate. Background Technology

[0002] Powder rolling technology involves feeding raw material powder between two rollers rotating in opposite directions. The powder is then pressed against the rollers to form a plate-shaped billet with a specific size and porosity. High-temperature treatment processes, such as sintering, are then used to eliminate green stress and improve the bonding strength of the green billet, resulting in a porous material with the target pore size and porosity. Due to its simple process, low energy consumption, and low cost, powder rolling technology has become an important technique in continuous forming. Titanium, with its high electrical conductivity, good mechanical properties, and stable chemical properties, is used to produce porous tubular, plate, and composite materials. Porous titanium plates prepared using powder rolling have been widely used in metallurgy, chemical engineering, and water treatment. However, due to limitations imposed by the intrinsic properties of the raw materials, feeding methods, and mill performance, powder-rolled porous metal plates are mostly small-sized plates with a width less than 300 mm, a thickness greater than 0.5 mm, and a porosity less than 60%. This cannot meet the needs of industries such as water electrolysis, chlor-alkali, and pharmaceuticals for porous titanium filter elements.

[0003] Chinese patent application number CN201911203716.0 discloses a method for improving the uniformity of large-size powder-rolled porous metal plates. This invention increases the friction between the roller surface and the powder by adding a forming agent to the raw material powder, uniformly coating the roller surface with a layer of feed powder, improving the roller's gripping ability on the un-introduced raw material powder, and improving the uniformity of the thickness and porosity of the rolled porous metal plate, thus preparing a 450mm wide porous metal plate. However, by only controlling the feeding speed during rolling, it is difficult to ensure the uniformity of the powder at various positions across the width, and the control of thickness and porosity is quite difficult.

[0004] Chinese patent application number CN201711218485.1 discloses a rolling process for cold-rolled thin titanium strip with a width of 1250mm. This invention obtains a large-size thin titanium strip with a final thickness of 0.3mm by subjecting hot-rolled pure titanium strip to two annealing and pickling processes followed by two cold rolling processes. This patent stabilizes the rolling process by adding a pre-rolling heat treatment step and increasing the number of rolling passes, avoiding defects such as deformation and surface texture during rolling. However, the preparation process is complex, involves many steps, and has many uncertainties.

[0005] Application number CN201310640177.3 discloses a rolling method for ultrathin titanium strip. The method uses room temperature cold rolling to roll the titanium strip to be rolled in a 16-roll mill through 6 passes of rolling with different tensions to obtain an ultrathin titanium strip with a final thickness of 0.0086-0.0095mm. The titanium strip used in this patent is a dense material. However, for the preparation of porous metal materials, this process is prone to causing irreversible damage to the rolled parts, and the yield will be greatly affected.

[0006] Given the aforementioned drawbacks of existing technologies, there is a need for a method for preparing ultrathin titanium plates with high porosity. Summary of the Invention

[0007] The purpose of this invention is to provide a method for preparing ultra-thin metallic titanium plates with high porosity. This method optimizes the powder rolling process and controls the consistency of the roll state to prepare metallic titanium plates with characteristics such as large size, thin thickness, uniform pores, and good air permeability. The process is simple and highly operable.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A method for preparing a high-porosity ultrathin titanium plate includes the following steps:

[0010] Raw material preparation: Mix titanium powder and pore-forming agent evenly and set aside as raw material powder;

[0011] One-time rolling: Weigh the raw material powder required for a single green billet, and roll the weighed raw material powder through a rolling mill to obtain the green billet;

[0012] Sintering and forming: The green blank is sintered to obtain a shaped blank;

[0013] Secondary rolling: The formed billet is rolled a second time using a rolling mill to obtain the titanium metal plate.

[0014] Furthermore, in the above-mentioned method for preparing the titanium plate, the titanium powder has a particle size of -200 mesh, and the particle size of the titanium powder is consistent with that of the pore-forming agent powder.

[0015] Furthermore, in the above-mentioned method for preparing the titanium plate, the pore-forming agent is one or more of ammonium bicarbonate, urea, PVA, and PVP.

[0016] Furthermore, in the above-mentioned method for preparing the titanium plate, in the raw material preparation step, the ratio of the titanium powder to the pore-forming agent by mass is 10-50:1, and the mixing time of the titanium powder and the pore-forming agent is greater than 2 hours.

[0017] Furthermore, in the above-mentioned method for preparing titanium plates, the rolling mill includes two active rolls and two driven rolls. The feeding device is located directly above the rolling mill, and the discharge port of the chamber of the feeding device is aligned with the gap between the two active rolls. In the first rolling step, the feeding device is placed directly above the rolling mill, and the discharge port of the chamber is aligned with the gap between the active rolls. The weighed raw material powder is loaded into the chamber of the feeding device. The spacing of the active rolls of the rolling mill is adjusted to 0.2mm-0.4mm, the roll speed is 1m / min-2m / min, the rolling angle is 50°-70°, and the rolling force is 6t-9t. After starting the rolling mill, the feeding device is turned on, and the raw material powder enters the rolling mill in a self-propelled, vertical, and uniform feeding manner.

[0018] Furthermore, in the above-mentioned method for preparing titanium metal plates, cleaning brushes are provided on the lower sides of the two active rolls of the rolling mill. When the rolling mill is working, the cleaning brushes continuously clean the surface of the active rolls to keep the surface of the active rolls in a clean state, so that the raw material powder passes through the two active rolls of the rolling mill at a uniform speed to obtain a green billet.

[0019] Furthermore, in the above-mentioned method for preparing titanium metal plates, in the sintering and forming step, the green blank is placed in a graphite sintering boat and sintered at high temperature in a sintering furnace.

[0020] Furthermore, in the above-mentioned method for preparing titanium metal plates, in the sintering and forming step, the sintering temperature is 900℃-1200℃, and the temperature is held for 2h-4h to completely remove the pore-forming agent and form a stable sintering neck between the particles of the raw material powder. After cooling in the furnace and air cooling, the plate is taken out of the furnace. The sintering furnace is a vacuum sintering furnace or an atmosphere sintering furnace.

[0021] Furthermore, in the above-mentioned method for preparing titanium metal plates, in the secondary rolling step, the spacing of the active rolls of the rolling mill is 0.1mm-0.3mm, the roll speed is 1m / min-2m / min, the rolling angle is 50°-70°, and the rolling force is 1t-5t.

[0022] Furthermore, in the above-mentioned method for preparing the titanium plate, the average thickness deviation of the titanium plate is ≤0.02mm, the thickness of the titanium plate is <0.29mm, the width of the titanium plate is 300mm-500mm, the porosity of the titanium plate is ≥65%, and the tensile strength of the titanium plate is >10MPa.

[0023] Analysis reveals that this invention discloses a method for preparing high-porosity ultrathin metallic titanium plates. This method controls the surface smoothness of the rollers by adding a cleaning brush to the active roller, ensuring uniform feeding of raw material powder from the roller inlet. This produces large-size, high-porosity ultrathin metallic titanium plates with good air permeability, a thickness of less than 0.29 mm, a porosity of greater than or equal to 65%, and a width of 300 mm-500 mm. This solves the limitations of rolling processes on the thickness and porosity uniformity of large-size porous plates. The method optimizes the powder rolling process by controlling parameters such as powder feeding, rolling angle, and rolling force, improving the flexibility and controllability of the powder rolling process and addressing the problem of mutual constraints between product size, porosity, and throughput in traditional titanium plate preparation methods. This reduces the processing cost of ultrathin titanium plates and expands the application scenarios of large-size ultrathin titanium plates to meet the needs of industries such as water electrolysis and pharmaceuticals. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0025] Figure 1 A schematic diagram of the structure of a feeding device and a rolling mill according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached diagram: 1. Driven roller; 2. Driven roller; 3. Feed inlet; 4. Chamber; 5. Raw material powder; 6. Green body; 7. Cleaning brush. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0028] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art. Unless otherwise specified, the experimental reagents used in the following embodiments are conventional biochemical reagents; the amounts of experimental reagents used are, unless otherwise specified, the amounts used in conventional experimental operations; and the experimental methods used are, unless otherwise specified, conventional methods.

[0029] like Figure 1 As shown in the embodiment of the present invention, a method for preparing a high-porosity ultrathin titanium plate is provided, comprising the following steps:

[0030] Step 1), Raw material preparation: Use a powder mixing device to uniformly mix the dried titanium powder with the pore-forming agent, and use it as raw material powder for later use.

[0031] The raw material for preparing the titanium plate is titanium powder with a particle size of -200 mesh. An auxiliary material, a pore-forming agent, is added to the titanium powder to control the porosity of the titanium plate. The particle size of the titanium powder and the pore-forming agent powder are consistent. The pore-forming agent is one or more of ammonium bicarbonate, urea, PVA, and PVP. The ratio of titanium powder to pore-forming agent by mass is 10-50:1 (e.g., 10:1, 15:1, 20:1, 25:1, 30:1, 35:1, 40:1, 45:1, 50:1). The mixing time of titanium powder and pore-forming agent is greater than 2 hours.

[0032] Step 2), one-time rolling: Weigh the raw material powder required for a single green billet, and roll the weighed raw material powder through a rolling mill to obtain the green billet.

[0033] Place the feeding device directly above the rolling mill and align the discharge port of the chamber with the gap of the drive roll 1. Load the weighed raw material powder into the chamber of the feeding device. Adjust the spacing of the drive roll 1 of the rolling mill to 0.2mm-0.4mm (e.g., 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm) and the roll speed to 1m / min-2m / min (e.g., 1.0m / min, 1.1m / min, 1.2m / min, 1.3m / min, 1.4m / min, 1.5m / min, 1.6m / min, 1.7m / min, 1.8m / min, 1.9m / min, 2.0m / min). This setting can ensure the thickness and uniformity of the rolled green billet. The rolling angle of the rolls is 50°-70° (e.g., 50°, 52°, 54°, 56°, 58°, 60°, 62°, 64°, 66°, 68°, 70°), and the rolling force is 6t-9t (e.g., 6t, 6.5t, 7t, 7.5t, 8t, 8.5t, 9t), preferably 8t. After starting the mill, the feeding device is activated, and the raw material powder enters the mill in a self-propelled, vertical, and uniform feeding manner.

[0034] like Figure 1As shown, the rolling mill is a four-high horizontal rolling mill, comprising two drive rolls 1 and two driven rolls 2. A feeding device is located directly above the mill, with the outlet of the feeding device's chamber 4 aligned with the gap between the two drive rolls 1. A feeding port 3 is located at the upper end of the feeding device. Raw material powder 5 is fed into the chamber 4 of the feeding device through the feeding port 3. After being rolled by the drive rolls 1 and driven rolls 2, the raw material powder 5 forms a green titanium plate 6. Cleaning brushes 7 are installed on the lower sides of each of the two drive rolls 1. During mill operation, the cleaning brushes 7 continuously clean the surface of the drive rolls 1, keeping the surface of the drive rolls 1 clean and ensuring that the raw material powder 5 passes uniformly between the two drive rolls 1.

[0035] By controlling the surface smoothness of the drive roll 1 with a cleaning brush 7, the roll maintains a consistent state during operation, ensuring that the raw material powder is fed uniformly from the inlet of the drive roll 1 and maintaining a uniform feeding speed. This avoids the raw material powder adhering to the surface of the drive roll 1 from affecting the uniformity of feeding and the thickness of the rolled product, while also avoiding porosity loss caused by forced feeding. Through the autonomous vertical uniform feeding of the raw material powder, large-sized metal titanium plates with a width of 300mm to 500mm are rolled out. The green plates have high porosity, good thickness uniformity, and an average thickness deviation of ≤0.02mm.

[0036] Step 3) Sintering and shaping: The green blank is sintered to obtain the shaped blank.

[0037] The green blanks are placed in a graphite sintering boat and sintered at high temperature in a sintering furnace. The sintering furnace can be a vacuum sintering furnace or an atmosphere sintering furnace. The atmosphere gas in the atmosphere sintering furnace is argon or other inert gas. The sintering temperature is 900℃-1200℃ (e.g., 900℃, 920℃, 940℃, 960℃, 980℃, 1000℃, 1020℃, 1040℃, 1060℃, 1080℃). The temperature is set at 1100℃, 1120℃, 1140℃, 1160℃, 1180℃, or 1200℃, and held for 2-4 hours (e.g., 2h, 2.2h, 2.4h, 2.6h, 2.8h, 3h, 3.2h, 3.4h, 3.6h, 3.8h, or 4h) to completely remove the pore-forming agent and form stable sintering necks between the raw material powder particles. The powder is then cooled in the furnace and air-cooled before being removed from the furnace.

[0038] Step 4) Secondary Rolling: The formed billet is subjected to secondary rolling through a rolling mill. The spacing of the driving rolls 1 of the rolling mill is 0.1mm-0.3mm (e.g., 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm), and the roll speed is 1m / min-2m / min (e.g., 1m / min, 1.1m / min, 1.2m / min, 1.3m / min, 1.4m / min). Rolling speeds of 1.5 m / min, 1.6 m / min, 1.7 m / min, 1.8 m / min, 1.9 m / min, and 2 m / min are used. Rolling angles range from 50° to 70° (e.g., 50°, 52°, 54°, 56°, 58°, 60°, 62°, 64°, 66°, 68°, and 70°), and rolling forces range from 1 t to 5 t (1 t, 1.5 t, 2 t, 2.5 t, 3 t, 3.5 t, 4 t, 4.5 t, and 5 t). Preferably, the rolling force is 3 t, yielding metallic titanium plates. The above rolling force parameters improve the flexibility and controllability of the powder rolling process.

[0039] The titanium plates prepared by the above method have an average thickness deviation of ≤0.02mm, a thickness of less than 0.29mm, a width of 300mm-500mm, a porosity of ≥65%, and a tensile strength >10MPa. These thin, highly permeable, and mechanically strong titanium plates meet the requirements of conventional applications and can replace porous materials in industries such as water electrolysis, biopharmaceuticals, and petrochemicals due to their excellent electrical conductivity and chemical stability. The large-size, ultra-thin porous titanium plates prepared by this method exhibit stable chemical properties. When placed in a weakly acidic or neutral solution for 100 hours, their pore size and permeability do not change significantly, allowing for stable operation in weakly acidic environments such as fuel cells and water electrolysis, effectively extending their service life and addressing the high cost of titanium plates used in fuel cells, water electrolysis, and pharmaceuticals. The preparation method is simple to operate, highly efficient, involves few steps, has a simple process, and exhibits high process stability.

[0040] Example 1

[0041] 1. Raw material preparation: Dry -325 to +500 mesh metallic titanium powder and pore-forming agent powder of the same particle size are mixed at a ratio of 50:1 for 3 hours. After mixing evenly, it is ready for use. The pore-forming agent is ammonium bicarbonate.

[0042] 2. Single Rolling: Place the feeding device directly above the rolling mill, align the discharge port with the gap of the drive roll 1, and weigh the raw material powder required for a single green sheet and load it into the feeding device chamber. Adjust the spacing of the drive roll 1 of the rolling mill to 0.3mm, the roll speed to 1.5m / min, the rolling angle to 60°, and the rolling force to 8t. After starting the rolling mill, the raw titanium powder passes uniformly through the two rolls of the rolling mill and through the cleaning brush 7 section of the roll surface to circulate and remove the adhering powder particles, resulting in a metal titanium plate green sheet with a width of 300mm and a thickness of 0.35mm after a single rolling.

[0043] 3. Sintering and forming: The raw titanium plate is placed in a graphite sintering boat and sintered at high temperature in a vacuum sintering furnace at 1100℃ for 3 hours to form sintering necks between the raw material powder particles. The sintered body is cooled with the furnace and then air-cooled before being taken out of the furnace.

[0044] 4. Secondary rolling: The sintered titanium metal plate is subjected to secondary rolling using a rolling mill. The spacing of the active roll 1 of the rolling mill is adjusted to 0.25 mm, the roll speed is 1.5 m / min, the rolling angle is 60°, and the rolling force is 3 t to obtain the titanium metal plate.

[0045] The titanium metal plate prepared by the above method has a thickness of 0.27 mm, a thickness deviation of 0.02 mm, a width of 300 mm, a porosity of 67%, and a tensile strength of 47 MPa.

[0046] Example 2

[0047] 1. Raw material preparation: Dry -325~+500 mesh metallic titanium powder and pore-forming agent powder of the same particle size are mixed at a ratio of 30:1 for 4 hours. After mixing evenly, it is ready for use. The pore-forming agent is urea.

[0048] 2. Single Rolling: Place the feeding device directly above the rolling mill, align the discharge port with the gap of the drive roll 1, and weigh the raw material powder required for a single green sheet and load it into the feeding device chamber. Adjust the spacing of the drive roll 1 of the rolling mill to 0.35mm, the roll speed to 1.5m / min, the rolling angle to 60°, and the rolling force to 8t. After starting the rolling mill, the raw titanium powder passes uniformly through the two rolls of the rolling mill and through the cleaning brush 7 section of the roll surface to have the adhering powder particles circulated and removed, resulting in a metal titanium plate green sheet with a width of 300mm and a thickness of 0.35mm after a single rolling.

[0049] 3. Sintering and forming: The raw titanium plate is placed in a graphite sintering boat and sintered at high temperature in a vacuum sintering furnace at 1000℃ for 4 hours to form sintering necks between the raw material powder particles. The sintered body is cooled with the furnace and then air-cooled before being taken out of the furnace.

[0050] 4. Secondary rolling: The sintered titanium metal plate is subjected to secondary rolling using a rolling mill. The spacing of the active roll 1 of the rolling mill is adjusted to 0.25 mm, the roll speed is 1.5 m / min, the rolling angle is 60°, and the rolling force is 3 t to obtain the titanium metal plate.

[0051] The titanium metal plate prepared by the above method has a thickness of 0.27 mm, a thickness deviation of 0.02 mm, a width of 300 mm, a porosity of 67%, and a tensile strength of 45 MPa.

[0052] Example 3

[0053] 1. Raw material preparation: Dry -500 mesh metallic titanium powder and pore-forming agent powder of the same particle size are mixed at a ratio of 50:1 for 3 hours. After mixing evenly, it is ready for use. The pore-forming agent is PVA.

[0054] 2. Single Rolling: Place the feeding device directly above the rolling mill, align the discharge port with the gap of the drive roll 1, and weigh the raw material powder required for a single green sheet and load it into the feeding device chamber. Adjust the spacing of the drive roll 1 of the rolling mill to 0.4 mm, the roll speed to 1.5 m / min, the rolling angle to 60°, and the rolling force to 9 t. After starting the rolling mill, the raw titanium powder passes through the two rolls of the rolling mill at a uniform speed. The surface of the rolls is cleaned by the circulating cleaning brush 7 to remove the adhering powder particles, resulting in a metal titanium plate green sheet with a width of 500 mm and a thickness of 0.32 mm after a single rolling.

[0055] 3. Sintering and forming: The raw titanium plate is placed in a graphite sintering boat and sintered at high temperature in an Ar atmosphere sintering furnace. The sintering temperature is 950℃ and the holding time is 3h, so that sintering necks are formed between the particles of the raw material powder. The sintered body is cooled with the furnace and then air-cooled before being taken out of the furnace.

[0056] 4. Secondary rolling: The sintered titanium metal plate is subjected to secondary rolling using a rolling mill. The spacing of the active roll 1 of the rolling mill is adjusted to 0.27 mm, the roll speed is 1.5 m / min, the rolling angle is 60°, and the rolling force is 4 t to obtain the titanium metal plate.

[0057] The titanium metal plate prepared by the above method has a thickness of 0.28 mm, a thickness deviation of 0.02 mm, a width of 500 mm, a porosity of 65%, and a tensile strength of 49 MPa.

[0058] Example 4

[0059] 1. Raw material preparation: Dry -500 mesh metallic titanium powder and pore-forming agent powder of the same particle size are mixed at a ratio of 30:1 for 4 hours. After mixing evenly, it is ready for use. The pore-forming agent is PVA.

[0060] 2. Single Rolling: Place the feeding device directly above the rolling mill, align the discharge port with the gap of the drive roll 1, and weigh the raw material powder required for a single green sheet and load it into the feeding device chamber. Adjust the spacing of the drive roll 1 of the rolling mill to 0.35mm, the roll speed to 1.5m / min, the rolling angle to 60°, and the rolling force to 9t. After starting the rolling mill, the raw titanium powder passes through the two rolls of the rolling mill at a uniform speed. The surface of the rolls, after passing through the cleaning brush 7, is circulated to remove the adhering powder particles, resulting in a metal titanium plate green sheet with a width of 500mm and a thickness of 0.32mm after a single rolling.

[0061] 3. Sintering and forming: The raw titanium plate is placed in a graphite sintering boat and sintered at high temperature in an Ar atmosphere sintering furnace. The sintering temperature is 950℃ and the holding time is 4h, so that sintering necks are formed between the particles of the raw material powder. The sintered body is cooled with the furnace and then air-cooled before being taken out of the furnace.

[0062] 4. Secondary rolling: The sintered titanium metal plate is rolled a second time using a rolling mill. The mill roll spacing is adjusted to 0.27 mm, the roll speed to 1.5 m / min, the rolling angle to 60°, and the rolling force to 4 t to obtain the titanium metal plate.

[0063] The titanium metal plate prepared by the above method has a thickness of 0.28 mm, a thickness deviation of 0.02 mm, a width of 500 mm, a porosity of 66%, and a tensile strength of 49 MPa.

[0064] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0065] 1. By adding a cleaning brush 7 to the active roller to control the surface smoothness of the roller, the raw material powder is fed evenly from the roller inlet, and large-size high-porosity ultra-thin metal titanium plates with good air permeability, such as a thickness of less than 0.29mm, a porosity of greater than or equal to 65%, and a width of 300mm-500mm, are prepared, thus solving the limitation of rolling process on the thickness uniformity and porosity uniformity of large-size perforated plates.

[0066] 3. Optimize the powder rolling process, control parameters such as powder feeding, rolling angle, and rolling force, improve the flexibility and controllability of the powder rolling process, and improve the problem of mutual constraints between product size, porosity, and throughput in traditional titanium plate preparation methods.

[0067] 4. Reduce the processing cost of ultra-thin titanium plates, expand the application scenarios of large-size ultra-thin titanium plates, and meet the needs of industries such as fuel cells, water electrolysis, and pharmaceuticals.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a high-porosity ultrathin titanium plate, characterized in that, Includes the following steps: Raw material preparation: Mix titanium powder and pore-forming agent evenly and set aside as raw material powder; One-time rolling: Weigh the raw material powder required for a single green billet, adjust the spacing of the drive rolls of the rolling mill to 0.2mm-0.4mm, the roll speed to 1m / min-2m / min, the rolling angle to 50°-70°, and the rolling force to 6t-9t. The weighed raw material powder is rolled by the rolling mill to obtain a green billet of titanium metal plate with a width of 300mm-500mm. The average thickness deviation of the green billet is ≤0.02mm. Sintering and shaping: The green blank is sintered at a temperature of 900℃-1200℃ and held for 2h-4h to completely remove the pore-forming agent and form a stable sintering neck between the particles of the raw material powder. After cooling in the furnace and air cooling, it is taken out of the furnace to obtain the shaped blank. Secondary rolling: The formed billet is subjected to secondary rolling through a rolling mill. The spacing between the drive rolls of the rolling mill is 0.1mm-0.3mm, the roll speed is 1m / min-2m / min, the rolling angle is 50°-70°, and the rolling force is 1t-5t, to obtain the titanium metal plate. Cleaning brushes are installed on the lower sides of each of the two drive rolls of the rolling mill. During the operation of the rolling mill, the cleaning brushes continuously clean the surface of the drive rolls, keeping the surface of the drive rolls clean and allowing the raw material powder to pass between the two drive rolls at a constant speed and quantity to obtain green billets. The titanium powder has a particle size of -200 mesh. The particle size of the titanium powder is the same as that of the pore-forming agent powder. In the raw material preparation step, the ratio of titanium powder to pore-forming agent by mass is 10-50:1, and the mixing time of titanium powder and pore-forming agent is greater than 2 hours. The porosity of the titanium plate is ≥65%. The thickness of the titanium plate is <0.29 mm. The average thickness deviation of the titanium plate is ≤0.02mm. The width of the titanium plate is 300mm-500mm. The tensile strength of the titanium plate is >10 MPa. The pore-forming agent is one or more of ammonium bicarbonate, urea, PVA, and PVP.

2. The method for preparing a titanium plate according to claim 1, characterized in that, The rolling mill includes two drive rolls and two driven rolls. The feeding device is located directly above the rolling mill, and the discharge port of the feeding device's chamber is aligned with the gap between the two drive rolls. In the first rolling step, the feeding device is placed directly above the rolling mill, and the discharge port of the chamber is aligned with the gap of the drive roll. The weighed raw material powder is then loaded into the chamber of the feeding device. After the rolling mill is started, the feeding device is activated, and the raw material powder enters the rolling mill in a self-propelled, vertical, and uniform feeding manner.

3. The method for preparing a metallic titanium plate according to claim 1, characterized in that, In the sintering and forming step, the green blank is placed in a graphite sintering boat and sintered at high temperature in a sintering furnace.

4. The method for preparing a metallic titanium plate according to claim 3, characterized in that, The sintering furnace is a vacuum sintering furnace or an atmosphere sintering furnace.

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