Preparation method of titanium-nickel-zirconium alloy filter element

Abstract

The invention discloses a preparation method of a titanium-nickel-zirconium alloy filter element, and relates to the technical field of filter elements. The method comprises the steps that electrolytic nickel, titanium sponge and zirconium sponge are subjected to vacuum melting to obtain a titanium-nickel-zirconium alloy cast ingot, the mass percent of the electrolytic nickel is 49%-50%, the mass percent of the titanium sponge is 50%-51%, and the mass percent of the zirconium sponge is 0.1%-0.3%; processing the titanium-nickel-zirconium alloy ingot into alloy powder; processing the alloy powder into a tubular degreased blank; the tubular degreased blank is heated to 1000-1200 DEG C and then subjected to first-time heat preservation treatment, and a first heat preservation blank is obtained; cooling the first heat preservation blank to 350-450 DEG C, and carrying out second heat preservation treatment to obtain a second heat preservation blank; and under the argon atmosphere, the second heat preservation blank is cooled to the normal temperature, and the titanium-nickel-zirconium alloy filtering element is obtained.

Description

Technical Field

[0001] The present application relates to the technical field of filter elements, and in particular to a method for preparing a titanium-nickel-zirconium alloy filter element. Background Art

[0002] Alloy filter elements can filter gas and filtrate, and are widely used in coal chemical industry, fine chemical industry, biomedicine and aerospace. The current stainless steel filter elements do not have superelasticity, and there is a risk of failure such as rupture caused by excessive deformation under conditions of large pressure difference and large impact. At the same time, traditional stainless steel porous filter elements cannot serve for a long time in special corrosive environments due to their composition, and their fatigue resistance and wear resistance are not outstanding. Summary of the invention

[0003] The present application provides a method for preparing a titanium-nickel-zirconium alloy filter element, which can improve the performance of the filter element.

[0004] In order to achieve the above purpose, this application adopts the following technical solutions:

[0005] In a first aspect of an embodiment of the present application, a method for preparing a titanium-nickel-zirconium alloy filter element is provided, the method comprising:

[0006] Vacuum melting electrolytic nickel, titanium sponge and zirconium sponge to obtain a titanium-nickel-zirconium alloy ingot, wherein the mass percentage of the electrolytic nickel is 49%-50%, the mass percentage of the titanium sponge is 50%-51%, and the mass percentage of the zirconium sponge is 0.1-0.3%;

[0007] Processing the titanium-nickel-zirconium alloy ingot into alloy powder;

[0008] Processing the alloy powder into a tubular degreased blank;

[0009] The tubular defatted blank is heated to 1000-1200° C. and then subjected to a first heat preservation treatment to obtain a first heat preservation blank;

[0010] The first heat-insulated blank is cooled to 350-450° C. and then subjected to a second heat-insulated treatment to obtain a second heat-insulated blank;

[0011] Under an argon atmosphere, the second heat-insulated blank is cooled to room temperature to obtain a titanium-nickel-zirconium alloy filter element.

[0012] As a possible implementation method, processing the titanium-nickel-zirconium alloy ingot into alloy powder includes:

[0013] Processing the titanium-nickel-zirconium alloy ingot into a rod by a hot working method, wherein the diameter of the rod is 60-80 mm;

[0014] The rod is processed into the alloy powder.

[0015] As a possible implementation manner, processing the rod into the alloy powder includes:

[0016] The rod material is prepared into the alloy powder by using a plasma rotary motor atomization powder making device.

[0017] As a possible implementation method, the step of processing the alloy powder into a tubular degreased blank comprises:

[0018] The alloy powder is placed in a PVB aqueous solution for dissolution to obtain a solution, wherein the mass fraction of the PVB aqueous solution is 2%-20%;

[0019] The dissolved solution is dried to prepare powder to obtain granulated particles;

[0020] The granulated particles are processed into the tubular defatted blanks.

[0021] As a possible implementation, the step of processing the granulated particles into the tubular defatted blank comprises:

[0022] After the granulated particles are pressed, a formed tubular blank is obtained;

[0023] After the tubular blank is subjected to a degreasing treatment, the tubular defatted blank is obtained.

[0024] As a possible implementation method, the dissolving solution is dried to prepare powder to obtain granulated particles, comprising:

[0025] After drying the dissolved liquid, crushing it into powder;

[0026] The powder is put into a vibrating powder screening machine to be dispersed by mechanical vibration, and then sieved by a sieve to obtain granulated particles.

[0027] As a possible implementation, the granulated particles are pressed to obtain a formed tubular blank, comprising:

[0028] After the granulated particles are loaded into the component mold, they are mechanically vibrated and packaged, and then put into a cold isostatic press for pressing, and then demolded to obtain the tubular blank. The component mold is made of a rubber sleeve and a dense metal rod.

[0029] As a possible implementation, the step of degreasing the tubular blank to obtain the tubular defatted blank comprises:

[0030] The tubular blank is placed in a degreasing furnace, and the degreasing furnace is heated to 400-550° C. and kept warm for 1-3 hours to obtain the tubular degreased blank.

[0031] As a possible implementation, the first heat preservation treatment is performed after heating the tubular defatted blank to 1000-1200° C., comprising:

[0032] The tubular defatted blank is placed in a vacuum sintering furnace, and the vacuum sintering furnace is heated to 1000-1200° C. and then subjected to a first heat preservation treatment;

[0033] The step of cooling the first heat-insulated blank to 350-450° C. and then performing a second heat-insulating treatment comprises:

[0034] After the vacuum sintering furnace is cooled to the temperature of 350-450° C., the first heat-insulating blank is subjected to a second heat-insulating treatment.

[0035] A second aspect of an embodiment of the present application provides a titanium-nickel-zirconium alloy filter element, which is prepared by the method for preparing a titanium-nickel-zirconium alloy filter element provided in the first aspect of an embodiment of the present application.

[0036] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0037] A method for preparing a titanium-nickel-zirconium alloy filter element is provided in an embodiment of the present application. The method comprises the following steps: vacuum melting electrolytic nickel, sponge titanium and sponge zirconium to obtain a titanium-nickel-zirconium alloy ingot, wherein the mass percentage of the electrolytic nickel is 49%-50%, the mass percentage of the sponge titanium is 50%-51%, and the mass percentage of the sponge zirconium is 0.1-0.3%; the titanium-nickel-zirconium alloy ingot is then processed into alloy powder, and the alloy powder is then processed into a tubular degreased blank, the tubular degreased blank is heated to 1000-1200°C and subjected to a first insulation treatment to obtain a first insulation blank, the first insulation blank is cooled to 350-450°C and subjected to a second insulation treatment to obtain a second insulation blank, and finally the second insulation blank is cooled to room temperature under an argon atmosphere to obtain a titanium-nickel-zirconium alloy filter element.

[0038] Since the prepared titanium-nickel-zirconium alloy filter element is mainly a binary alloy composed of titanium and nickel, the crystal structure of the titanium-nickel alloy will change under the change of temperature and applied stress, that is, the transformation of austenite phase and martensite phase. The phase transformation sequence of the titanium-nickel alloy when cooling or applying stress is austenite phase-R phase-martensite phase. The characteristics of this martensitic phase transformation of the titanium-nickel alloy make it superelastic. On the basis of the titanium-nickel alloy, a small amount of zirconium, which is in the same family as titanium and has similar physical and chemical properties and can form an infinite substitution solid solution, can be added to increase the martensitic phase transformation temperature and shape memory performance of the titanium-nickel alloy, improve the alloy strength, and further improve its wear resistance. Compared with conventional stainless steel porous filter elements, the titanium-nickel-zirconium alloy filter element of the present application has superelasticity (phase transformation pseudoelasticity can reach about 8%), shape memory performance and high damping performance, and also has good mechanical properties, excellent fatigue resistance, wear resistance and corrosion resistance, and excellent biocompatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A flow chart of a method for preparing a titanium-nickel-zirconium alloy filter element provided in an embodiment of the present application;

[0040] Figure 2 A cross-sectional microscopic image of a titanium-nickel-zirconium alloy filter element provided in an embodiment of the present application;

[0041] Figure 3 A macroscopic structural cross-sectional view of a titanium-nickel-zirconium alloy filter element provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0044] Additionally, the use of “based on” or “according to” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” or “according to” one or more conditions or values ​​may, in practice, be based on additional conditions or beyond values.

[0045] The present application embodiment provides a method for preparing a titanium-nickel-zirconium alloy filter element, such as Figure 1 As shown, the method comprises the following steps:

[0046] Step 101, vacuum melting the electrolytic nickel, sponge titanium and sponge zirconium to obtain a titanium-nickel-zirconium alloy ingot, wherein the mass percentage of the electrolytic nickel is 49%-50%, the mass percentage of the sponge titanium is 50%-51%, and the mass percentage of the sponge zirconium is 0.1-0.3%.

[0047] Among them, the electrolytic nickel raw materials meet the standards of Ni9990 and above in GB / T 6516-2010 "Electrolytic Nickel", the sponge titanium raw materials meet the standards of Grade 2 and above in GB / T 2524-2002 "Sponge Titanium", and the sponge zirconium raw materials meet the standards of HZr-2 and above in YS / T 397-2015 "Sponge Zirconium".

[0048] Step 102: Processing the titanium-nickel-zirconium alloy ingot into alloy powder.

[0049] Optionally, the process of step 102 may be:

[0050] The titanium-nickel-zirconium alloy ingot can be processed into a rod by a hot working method, wherein the diameter of the rod is 60-80 mm, and the rod is processed into the alloy powder.

[0051] Specifically, the process of processing the rod into the alloy powder may be:

[0052] The rod material is prepared into the alloy powder by using a plasma rotary motor atomization powder making device.

[0053] Step 103: Processing the alloy powder into a tubular degreased blank.

[0054] Optionally, the process of step 103 may be:

[0055] The alloy powder is placed in a PVB aqueous solution for dissolution to obtain a solution, wherein the mass fraction of the PVB aqueous solution is 2%-20%;

[0056] The dissolved solution is dried to prepare powder to obtain granulated particles;

[0057] The granulated particles are processed into the tubular defatted blanks.

[0058] Specifically, the above-mentioned processing of the granulated particles into the tubular defatted blank comprises:

[0059] After the granulated particles are pressed, a formed tubular blank is obtained; after the tubular blank is degreased, the tubular defatted blank is obtained.

[0060] Specifically, the process of drying the dissolved solution to prepare powder and obtaining granulated particles may be:

[0061] The dissolved liquid is dried and crushed into powder; the powder is put into a vibrating powder screening machine to be dispersed by mechanical vibration and then sieved by a sieve to obtain granulated particles.

[0062] Specifically, after the granulated particles are pressed, a formed tubular blank is obtained, which comprises:

[0063] After the granulated particles are loaded into the component mold, they are mechanically vibrated and packaged, and then put into a cold isostatic press for pressing, and then demolded to obtain the tubular blank. The component mold is made of a rubber sleeve and a dense metal rod.

[0064] Specifically, the tubular defatted blank is obtained after the tubular blank is degreased, which includes: placing the tubular blank in a degreasing furnace, heating the degreasing furnace to 400-550° C., and keeping the temperature for 1-3 hours to obtain the tubular defatted blank.

[0065] Step 104, heating the tubular defatted blank to 1000-1200°C and performing a first heat preservation treatment to obtain a first heat preservation blank.

[0066] Optionally, the process of step 104 may be: placing the tubular defatted blank into a vacuum sintering furnace, heating the vacuum sintering furnace to 1000-1200° C., and then performing a first heat preservation treatment.

[0067] Step 105, cooling the first heat-insulated blank to 350-450°C and performing a second heat-insulating treatment to obtain a second heat-insulated blank.

[0068] Optionally, the process of step 105 may be: after cooling the vacuum sintering furnace to the temperature of 350-450° C., the first heat-insulating blank is subjected to a second heat-insulating treatment.

[0069] Step 106: Cool the second heat-insulated blank to room temperature under an argon atmosphere to obtain a titanium-nickel-zirconium alloy filter element.

[0070] In the actual preparation process, after the second heat-insulating blank is obtained, argon gas can be passed through the furnace for cooling, and a superelastic titanium-nickel-zirconium alloy filter element can be obtained after it is taken out of the furnace.

[0071] The filtering principle of the titanium-nickel-zirconium alloy filter element is to achieve filtration through the gaps between the metal particles between the titanium-nickel-zirconium alloy filter elements. The filtering accuracy of the titanium-nickel-zirconium alloy filter element is controlled by controlling the particle size of the above-mentioned granulated particles. Among them, the filtering accuracy can be the particle size of the substance being filtered out.

[0072] The titanium-nickel-zirconium alloy filter element prepared by the above-mentioned titanium-nickel-zirconium alloy filter element preparation method has a composition ratio of titanium 49%-50% (mass percentage), nickel 50%-51% (mass percentage), and zirconium 0.1-0.3% (mass percentage). Since the main ratio of its titanium and nickel component content is a binary alloy composed of titanium and nickel, its alloy component ratio determines its microscopic crystal structure, and its crystal structure determines the macroscopic properties of the alloy.

[0073] The crystal structure of titanium-nickel alloy will change under the change of temperature and external stress, that is, the transformation of austenite phase and martensite phase. The phase transformation sequence of titanium-nickel alloy when cooling or applying external stress is parent phase (austenite phase)-R phase-martensite phase. Austenite is the state when the temperature is high or when the load is removed, with a cubic crystal structure and a relatively stable shape; R phase has a rhombus crystal structure and is a transition phase between austenite and martensite; martensite phase is the state when the temperature is relatively low or when external force is applied (activated by external force), with a hexagonal monoclinic crystal structure, ductility, reproducibility, less stable, and easier to deform. The ductility of this martensite phase can produce a strain far greater than its elastic limit under the condition of loading stress, and gradually recover the strain when unloading until it returns to its original state of austenite phase.

[0074] It is precisely because of the martensitic phase transformation characteristics of the crystal structure of titanium-nickel alloy that it has superelasticity. The so-called superelasticity refers to the phenomenon that the sample produces a strain far greater than its elastic limit strain under the action of external force, and the strain can automatically recover when unloading. That is, in the parent phase (austenite phase) state, due to the effect of external stress, stress-induced martensitic phase transformation occurs, so that the alloy exhibits mechanical behavior different from ordinary materials, its elastic limit is far greater than ordinary materials, and it no longer obeys Hooke's law.

[0075] On the basis of titanium-nickel alloy, by adding a small amount of zirconium, an element in the same family as titanium, with similar physical and chemical properties and capable of forming an infinite substitution solid solution, the martensitic phase transition temperature and shape memory properties of the titanium-nickel alloy can be increased, the strength of the alloy can be enhanced, and its wear resistance can be further improved.

[0076] Compared with conventional stainless steel powder porous filter elements, the titanium-nickel-zirconium alloy filter element provided in the embodiment of the present application has superelasticity (phase change pseudoelasticity can reach about 8%), good shock absorption characteristics, corrosion resistance in special working conditions, good wear resistance and other properties.

[0077] In engineering applications, the superelasticity of titanium-nickel-zirconium alloy filter elements can be used to twist and back-blow the filter element to remove the outer filter shell. The filter shell is a shell structure where the filtered material that cannot pass through the filter element accumulates and wraps around the filter element. Back-blow is to use the filtered liquid or gas phase to pressurize the filter in the reverse direction to pass through the filter element to impact the accumulation on the other side. This can greatly improve the filtration efficiency. Traditional stainless steel filter elements cannot remove the filter shell by twisting.

[0078] The titanium-nickel-zirconium alloy filter element of the present application has good shock-absorbing properties and is also of great value in engineering applications. The reason for the partial failure of traditional metal filter elements is that local fatigue cracking caused by vibration causes the element to fail. The titanium-nickel alloy porous filter element with shock-absorbing properties can produce a martensitic phase transformation due to the external force applied by the vibration. The ductility of this martensitic phase can produce a strain far greater than its elastic limit under loading stress conditions, thereby greatly reducing the damage caused by vibration to the element and extending the service life.

[0079] The preparation method of the titanium-nickel-zirconium alloy filter element provided in the above-mentioned embodiment. The present application also provides some specific embodiments. The following embodiments describe the technical solution of the present application in more detail, and these embodiments are only used for illustrative purposes, because it is obvious to those skilled in the art to make various modifications and changes within the scope of the disclosure of the present application. The reagents and raw materials used in the embodiments can be obtained by commercial purchase or synthesized according to conventional methods, and can be used directly without further treatment, and the instruments and devices used in the embodiments can be obtained by commercial purchase.

[0080] Embodiment 1

[0081] 1. Ingredients. Prepare the raw materials of 5-50mm flake electrolytic nickel (in accordance with the standard of Ni9990 and above in GB / T 6516-2010 "Electrolytic Nickel"), 5-20mm sponge titanium (in accordance with the standard of Grade 2 and above in GB / T 2524-2002 "Sponge Titanium"), and 5-10mm sponge zirconium (in accordance with the standard of HZr-2 and above in YS / T 397-2015 "Sponge Zirconium") according to the ratio of 49% (mass percentage) of titanium, 50.9% (mass percentage) of nickel, and 0.1% (mass percentage) of zirconium.

[0082] 2. Put the preliminarily mixed raw materials into a graphite crucible and melt them in a vacuum induction melting furnace. The vacuum degree is maintained at 8×10 -1 Pa, fully melt and stir for not less than 30 minutes, maintain vacuum degree while cooling in the furnace, pour out the titanium-nickel-zirconium alloy ingot, and use a lathe to remove the outer skin flash.

[0083] 3. The titanium-nickel-zirconium alloy ingot is loaded into an electric heating furnace with a loading temperature lower than 500°C and a holding temperature of 850°C. After holding for 2 hours, the alloy ingot is uprooted twice with a 2500t fast forging machine and forged into a rod with a diameter of about 80 mm, and the rod is turned into an outer circle.

[0084] 4. Use plasma rotating electrode atomization powder making equipment to prepare alloy powder from the rods, and sieve out powder with a mesh size of 100-160;

[0085] 5. Place the alloy powder in a 2% by mass PVB (polyvinyl butyral ester, content of more than 99%) aqueous solution, fully soak and stir, then dry and crush, put the powder into a vibrating powder screening machine to disperse it by mechanical vibration, and sieve it to obtain granulated particles;

[0086] 6. The granulated particles are loaded into a component mold consisting of a rubber sleeve and a dense metal rod, mechanically vibrated and packaged, and then placed in a cold isostatic press for pressing. After demolding, a formed tubular blank is obtained, wherein the pressing pressure is 800t and the pressure is maintained for 10 minutes.

[0087] 7. Put the tubular blank into the degreasing furnace, heat it to a degreasing platform of 400°C, keep it warm for 3 hours, remove the adhesive PVB in the tubular blank, and obtain a tubular degreased blank.

[0088] 8. Place the tubular defatted blank into a vacuum sintering furnace, heat the vacuum sintering furnace to a sintering temperature platform of 1000°C, and then keep it warm for 3 hours to allow the atoms between the metal powder particles to fully diffuse and form a sintering neck to obtain the first insulation blank.

[0089] 9. Cool the vacuum sintering furnace to 450°C, keep it warm for 10 minutes, and perform an aging treatment process to obtain a second insulation blank. This treatment can make the blank super elastic.

[0090] 10. Cooling with argon gas in a vacuum sintering furnace will yield a superelastic titanium-nickel-zirconium alloy filter element.

[0091] Embodiment 2

[0092] 1. Ingredients. Cut the electrolytic nickel plate with a thickness of less than 3mm into strips (in accordance with the standard of Ni9990 and above in GB / T 6516-2010 "Electrolytic Nickel"), 5-25mm titanium sponge (in accordance with the standard of Grade 2 and above in GB / T 2524-2002 "Titanium Sponge"), and 5-20mm zirconium sponge (in accordance with the standard of HZr-2 and above in YS / T 397-2015 "Zirconium Sponge"). Prepare the raw materials according to the ratio of titanium 49.5% (mass percentage), nickel 50.3% (mass percentage), and zirconium 0.2% (mass percentage);

[0093] 2. Put the preliminarily mixed raw materials into a graphite crucible and melt them in a vacuum induction melting furnace. The vacuum degree is maintained at 8×10 -1 Pa, fully melt and stir for not less than 30 minutes, keep the vacuum degree and cool in the furnace, pour out the titanium-nickel-zirconium alloy ingot, and use a lathe to remove the outer skin flash;

[0094] 3. The titanium-nickel-zirconium alloy ingot is loaded into an electric heating furnace with a loading temperature lower than 500°C and a holding temperature of 880°C. After holding for 1.5 hours, the alloy ingot is uprooted twice with a 2500t fast forging machine and forged into a bar with a diameter of about 70mm, and the bar is turned externally;

[0095] 4. Use plasma rotating electrode atomization powder making equipment to prepare alloy powder from the rods, and sieve out powder with a mesh size of 160-325;

[0096] 5. Place the alloy powder in a 10% by mass PVB (polyvinyl butyral ester, content of more than 99%) aqueous solution, fully soak and stir, then dry and crush, put the powder into a vibrating powder screening machine to disperse it by mechanical vibration, and sieve it to obtain granulated particles;

[0097] 6. Put the granulated particles into the component mold composed of a rubber sleeve and a dense metal rod, compact them mechanically, package them, and then put them into a cold isostatic press for pressing at a pressure of 900t and hold the pressure for 10 minutes;

[0098] 7. Put the tubular blank into the degreasing furnace, heat it to the degreasing platform of 450°C, keep it warm for 2 hours, remove the adhesive PVB in the tubular blank, and obtain the tubular degreased blank.

[0099] 8. Place the tubular defatted blank into a vacuum sintering furnace, heat the vacuum sintering furnace to a sintering temperature platform of 1100°C, and then keep it warm for 2 hours to allow the atoms between the metal powder particles to fully diffuse and form a sintering neck to obtain the first insulation blank.

[0100] 9. Cool the vacuum sintering furnace to 400°C, keep it warm for 15 minutes, and carry out aging treatment to obtain the second insulation blank. This treatment can make the blank super elastic.

[0101] 10. Cooling with argon gas in a vacuum sintering furnace will yield a superelastic titanium-nickel-zirconium alloy filter element.

[0102] Embodiment 3

[0103] 1. Ingredients. Prepare the raw materials of electrolytic nickel blocks with a thickness of less than 5 mm (in accordance with the standards of Ni9990 and above in GB / T 6516-2010 "Electrolytic Nickel"), sponge titanium with a specification of 5-25 mm (in accordance with the standards of Grade 2 and above in GB / T 2524-2002 "Sponge Titanium"), and sponge zirconium with a specification of 5-20 mm (in accordance with the standards of HZr-2 and above in YS / T 397-2015 "Sponge Zirconium") according to the ratio of 49.5% (mass percentage) of titanium, 50.3% (mass percentage) of nickel, and 0.2% (mass percentage) of zirconium;

[0104] 2. Put the preliminarily mixed raw materials into a graphite crucible and melt them in a vacuum induction melting furnace. The vacuum degree is maintained at 8×10 -1 Pa, fully melt and stir for not less than 30 minutes, keep the vacuum degree and cool in the furnace, pour out the titanium-nickel-zirconium alloy ingot, and use a lathe to remove the outer skin flash;

[0105] 3. The titanium-nickel-zirconium alloy ingot is loaded into an electric heating furnace with a loading temperature lower than 500°C and a holding temperature of 900°C. After holding for 1.5 hours, the alloy ingot is uprooted twice with a 2500t fast forging machine and forged into a bar with a diameter of about 70mm, and the bar is turned externally;

[0106] 4. Use plasma rotating electrode atomization powder making equipment to prepare alloy powder from the rods, and sieve out powder with a mesh size of 100-200;

[0107] 5. Place the alloy powder in a 20% by mass PVB (polyvinyl butyral ester, content of more than 99%) aqueous solution, fully soak and stir, then dry and crush, put the powder into a vibrating powder screening machine to disperse it by mechanical vibration, and sieve it to obtain granulated particles;

[0108] 6. The granulated particles are loaded into a component mold consisting of a rubber sleeve and a dense metal rod, mechanically vibrated and packaged, and then placed in a cold isostatic press for pressing. After demolding, a formed tubular blank is obtained. The pressing pressure is 950t, the pressure is maintained for 10 minutes, and the formed tubular blank is obtained after demolding.

[0109] 7. Put the tubular blank into the degreasing furnace, heat it to the degreasing platform of 550°C, keep it warm for 1 hour, remove the adhesive PVB in the tubular blank, and obtain the tubular degreased blank;

[0110] 8. Place the tubular defatted blank into a vacuum sintering furnace, heat the vacuum sintering furnace to a sintering temperature platform of 1200°C, and then keep it warm for 2 hours to allow the atoms between the metal powder particles to fully diffuse and form a sintering neck to obtain the first insulation blank.

[0111] 9. Cool the vacuum sintering furnace to 350°C, keep it warm for 20 minutes, and perform an aging treatment process to obtain a second insulation blank. This treatment can make the blank super elastic.

[0112] 10. Cooling with argon gas in a vacuum sintering furnace will yield a superelastic titanium-nickel-zirconium alloy filter element.

[0113] The cross-sectional microscopic image of the titanium-nickel-zirconium alloy filter element prepared by the titanium-nickel-zirconium alloy filter element preparation method provided in the above embodiment 3 is as follows: Figure 2 As shown, the macroscopic structural cross-section of the titanium-nickel-zirconium alloy filter element is as follows Figure 3 shown.

[0114] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for preparing a titanium-nickel-zirconium alloy filter element, characterized in that: The method comprises: Vacuum melting electrolytic nickel, titanium sponge and zirconium sponge to obtain a titanium-nickel-zirconium alloy ingot, wherein the mass percentage of the electrolytic nickel is 49%-50%, the mass percentage of the titanium sponge is 50%-51%, and the mass percentage of the zirconium sponge is 0.1-0.3%; Processing the titanium-nickel-zirconium alloy ingot into alloy powder; Processing the alloy powder into a tubular degreased blank; The tubular defatted blank is heated to 1000-1200° C. and then subjected to a first heat preservation treatment to obtain a first heat preservation blank; The first heat-insulated blank is cooled to 350-450° C. and then subjected to a second heat-insulated treatment to obtain a second heat-insulated blank; Under an argon atmosphere, the second heat-insulated blank is cooled to room temperature to obtain a titanium-nickel-zirconium alloy filter element.

2. The method according to claim 1, characterized in that The step of processing the titanium-nickel-zirconium alloy ingot into alloy powder comprises: Processing the titanium-nickel-zirconium alloy ingot into a rod by a hot working method, wherein the diameter of the rod is 60-80 mm; The rod is processed into the alloy powder.

3. The method according to claim 2, characterized in that The step of processing the rod into the alloy powder comprises: The rod material is prepared into the alloy powder by using a plasma rotary motor atomization powder making device.

4. The method according to claim 1, characterized in that: The step of processing the alloy powder into a tubular degreased blank comprises: The alloy powder is placed in a PVB aqueous solution for dissolution to obtain a solution, wherein the mass fraction of the PVB aqueous solution is 2%-20%; The dissolved solution is dried to prepare powder to obtain granulated particles; The granulated particles are processed into the tubular defatted blanks.

5. The method according to claim 4, characterized in that The step of processing the granulated particles into the tubular defatted blank comprises: After the granulated particles are pressed, a formed tubular blank is obtained; After the tubular blank is subjected to a degreasing treatment, the tubular defatted blank is obtained.

6. The method according to claim 4, characterized in that The method of drying the dissolved solution to prepare a powder to obtain granulated particles comprises: After drying the dissolved liquid, crushing it into powder; The powder is put into a vibrating powder screening machine to be dispersed by mechanical vibration, and then sieved by a sieve to obtain granulated particles.

7. The method according to claim 5, characterized in that After the granulated particles are pressed, a formed tubular blank is obtained, comprising: After the granulated particles are loaded into the component mold, they are mechanically vibrated and packaged, and then put into a cold isostatic press for pressing, and then demolded to obtain the tubular blank. The component mold is made of a rubber sleeve and a dense metal rod.

8. The method according to claim 5, characterized in that After the tubular blank is subjected to degreasing treatment, the tubular defatted blank is obtained, comprising: The tubular blank is placed in a degreasing furnace, and the degreasing furnace is heated to 400-550° C. and kept warm for 1-3 hours to obtain the tubular degreased blank.

9. The method according to claim 1, characterized in that: The first heat preservation treatment is performed after heating the tubular defatted blank to 1000-1200° C., comprising: The tubular defatted blank is placed in a vacuum sintering furnace, and the vacuum sintering furnace is heated to 1000-1200° C. and then subjected to a first heat preservation treatment; The step of cooling the first heat-insulated blank to 350-450° C. and then performing a second heat-insulating treatment comprises: After the vacuum sintering furnace is cooled to the temperature of 350-450° C., the first heat-insulating blank is subjected to a second heat-insulating treatment.

10. A titanium-nickel-zirconium alloy filter element, characterized in that: The titanium-nickel-zirconium alloy filter element is prepared by the method for preparing a titanium-nickel-zirconium alloy filter element according to any one of claims 1 to 9.

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