NL2033628B1 - Corrosion-resistant titanium alloy and preparation method thereof and corrosion-resistant flexible bearing - Google Patents
Corrosion-resistant titanium alloy and preparation method thereof and corrosion-resistant flexible bearing Download PDFInfo
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- NL2033628B1 NL2033628B1 NL2033628A NL2033628A NL2033628B1 NL 2033628 B1 NL2033628 B1 NL 2033628B1 NL 2033628 A NL2033628 A NL 2033628A NL 2033628 A NL2033628 A NL 2033628A NL 2033628 B1 NL2033628 B1 NL 2033628B1
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- flexible bearing
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000005260 corrosion Methods 0.000 title abstract description 77
- 230000007797 corrosion Effects 0.000 title abstract description 77
- 239000010936 titanium Substances 0.000 claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000005266 casting Methods 0.000 claims description 25
- 238000005496 tempering Methods 0.000 claims description 19
- 238000012545 processing Methods 0.000 claims description 18
- 238000005096 rolling process Methods 0.000 claims description 18
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims 4
- 230000008018 melting Effects 0.000 claims 4
- 238000000465 moulding Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- 229910045601 alloy Inorganic materials 0.000 abstract description 9
- 239000000956 alloy Substances 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000010349 cathodic reaction Methods 0.000 abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 229910052726 zirconium Inorganic materials 0.000 abstract description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 14
- 238000003723 Smelting Methods 0.000 description 12
- 230000002378 acidificating effect Effects 0.000 description 7
- 239000011780 sodium chloride Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000000306 component Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 238000010894 electron beam technology Methods 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000010422 painting Methods 0.000 description 5
- 239000011253 protective coating Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 229910009972 Ti2Ni Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 206010067484 Adverse reaction Diseases 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000006838 adverse reaction Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/62—Selection of substances
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2204/00—Metallic materials; Alloys
- F16C2204/40—Alloys based on refractory metals
- F16C2204/42—Alloys based on titanium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
Abstract
The present invention provides a corrosion-resistant titanium alloy, a preparation method thereof and a corrosion-resistant flexible bearing, and belongs to the technical field of titanium alloys. The present invention uses Ti as a base material, its chemical activity is very high, and a highly stable passive film may be formed on the surface at a room temperature, thereby the corrosion resistance is improved, an Mo element is a ß stabilized element, which may promote the formation of the ß phase; an Ni element added may be alloyed with a Ti element, which may form TizNi in Ot-Tl so as to accelerate a cathodic reaction, an Al element is a typical et stable element; and Zr belongs to an easily passivated alloy element, which may reduce the anodic activity of the titanium alloy. The addition of the Mo, Ni, Al, Zr elements may improve the corrosion resistance.
Description
CORROSION-RESISTANT TITANIUM ALLOY AND PREPARATION
METHOD THEREOF AND CORROSION-RESISTANT FLEXIBLE BEARING
[01] The present invention relates to the technical field of titanium alloys, in particular to a corrosion-resistant titanium alloy, a preparation method thereof and a corrosion-resistant flexible bearing.
[02] A flexible bearing is a core component of a harmonic reducer, and it is widely used in aerospace, robotics, precision instruments and many other fields. The traditional flexible bearing mainly bears the alternating stress, and achieves the performance requirements of the high reduction ratio by a certain elastic deformation generated by the cooperation of a thin wall of the bearing and a cam. It has the characteristics of large transmission ratio, wide application range, large bearing capacity, small density, and ability to transmit movement to a confined space. At present, inner and outer rings of the flexible bearing are both made of high-carbon chromium bearing steel or aluminum alloy, it has certain strength and toughness, but its corrosion resistance is ordinary, and it may not be used in an acidic medium for a long time. Therefore, how to make the flexible bearing serve in the acidic medium for a long time becomes a problem to be solved in this field.
[03] A purpose of the present invention is to provide a corrosion-resistant titanium alloy, a preparation method thereof and a corrosion-resistant flexible bearing. The corrosion-resistant titanium alloy provided by the present invention has the excellent corrosion resistance, and it is prepared into inner and outer rings of the flexible bearing so that the flexible bearing may be served in an acidic medium for a long time.
[04] In order to achieve the above purpose of the present invention, the present invention provides the following technical schemes:
[05] The present invention provides a corrosion-resistant titanium alloy, and the chemical components include: 0.1~0.5% of Mo, 0.3~0.6% of Ni, 0.1~0.5% of Al, 0.1~0.5% of Zr and the balance of Ti according to the mass percentage.
[06] Preferably, the chemical components include: 0.2~0.4% of Mo, 0.4~0.5% of
Ni, 0.3~0.4% of Al, 0.2~0.3% of Zr and the balance of Ti according to the mass percentage.
[07] The present invention further provides a preparation method for the corrosion-resistant titanium alloy in the above technical scheme, including the following steps:
[08] (1) performing smelting and casting on a raw material of the corrosion-resistant titanium alloy successively, to obtain a casting piece; and
[09] (2) performing forging-free direct rolling processing, quenching and tempering on the casting piece obtained in the step (1) successively, to obtain the corrosion-resistant titanium alloy.
[10] Preferably, in the step (1), the temperature of the smelting is 1726~1826C, and the time of the smelting is 10~15 min.
[11] Preferably, in the step (1), the smelting is performed under a vacuum condition.
[12] Preferably, the vacuum degree under the vacuum condition is less than 107% hPa.
[13] Preferably, in the step (2), the temperature of the forging-free direct rolling processing is 900~950 °C, and the strain rate of the forging-free direct rolling processing is 0.01-0.1 s't.
[14] Preferably, in the step (2), the temperature of the quenching is 800~900°C, and the time of the quenching is 5-10 s.
[15] Preferably, in the step (2), the temperature of the tempering is 520-560 °C, and the holding time of the tempering is 3-4 h.
[16] The present invention further provides a corrosion-resistant flexible bearing,
and the material of an inner ring and an outer ring of the corrosion-resistant flexible bearing is the corrosion-resistant titanium alloy in the above technical scheme or the corrosion-resistant titanium alloy prepared by the preparation method in the above technical scheme.
[17] The present invention provides a corrosion-resistant titanium alloy, and the chemical components include: 0.1~0.5% of Mo, 0.3~0.6% of Ni, 0.1~0.5% of Al, 0.1~0.5% of Zr and the balance of Ti according to the mass percentage. The present invention uses Ti as a base material, its chemical activity is very high, and a highly stable passive film may be formed on the surface at a room temperature, thereby the corrosion resistance is improved; an Mo element belongs to a thermodynamic stability element, and may improve the atomic bonding strength of a and B phases, and at the same time, the Mo element is a B stabilized element, which may promote the formation of the B phase, and the B phase may effectively prevent the propagation of an a phase crack, thereby the stress corrosion is effectively weakened; an Ni element added may be alloyed with a Ti element, which may form Ti2Ni in o-Ti so as to accelerate a cathodic reaction, and improve the corrosion resistance; an Al element is a typical a stable element, it may improve the properties of the alloy by forming replacement solid solution and then forming the solid solution strengthening effect; and Zr belongs to an easily passivated alloy element, which may reduce the anodic activity of the titanium alloy, thereby its passivation ability is increased, and the corrosion resistance of the titanium alloy is improved. Experimental results show that the inner and outer rings of the flexible bearing prepared from the titanium alloy provided by the present invention are assembled with a cage and a ceramic ball to form the flexible bearing, the open circuit potential in 3.5% NaCl solution is -0.466 V, the corrosion potential is -0.482~-0.486 V, the current density is 12.788 u A*cm?2~19.289 u A*cm™, and it may be served in an acidic medium for a long time.
[18] FIG. 1 is a structure schematic diagram of a flexible bearing provided by the present invention;
[19] FIG. 2 is an open circuit potential curve of the flexible bearing prepared in
Application examples 1 and 2 in 3.5% NaCl solution; and
[20] FIG. 3 is a polarization curve of the flexible bearing prepared in Application examples 1 and 2 in 3.5% NaCl solution.
[21] The present invention provides a corrosion-resistant titanium alloy, and the chemical components include: 0.1~0.5% of Mo, 0.3~0.6% of Ni, 0.1~0.5% of Al, 0.1~0.5% of Zr and the balance of Ti according to the mass percentage.
[22] Calculated by the mass percentage, the corrosion-resistant titanium alloy provided by the present invention includes 0.1~0.5% of Mo, preferably 0.2~0.4%, and more preferably 0.3%. In the present invention, the Mo element belongs to a thermodynamic stability element, and may improve the atomic bonding strength of a and B phases, and at the same time, the Mo element is a B stabilized element, which may promote the formation of the phase, and the phase may effectively prevent the propagation of an a phase crack, thereby the stress corrosion is effectively weakened
[23] Calculated by the mass percentage, the corrosion-resistant titanium alloy provided by the present invention includes 0.3~0.6% of Ni, preferably 0.4~0.5%, and more preferably 0.45%. In the present invention, the Ni element added may be alloyed with a Ti element, which may form Ti2Ni in a-Ti so as to accelerate a cathodic reaction, and improve the corrosion resistance.
[24] Calculated by the mass percentage, the corrosion-resistant titanium alloy provided by the present invention includes 0.1~0.5% of Al, preferably 0.3~0.4%, and more preferably 0.35%. In the present invention, the Al element is a typical o stable element, and it may improve the properties of the alloy by forming replacement solid solution and then forming the solid solution strengthening effect; and by controlling the content of the Al element, the present invention may avoid the occurrence of a brittle phase with Ti due to its excessive content, as to generate an adverse effect on the alloy properties.
[25] Calculated by the mass percentage, the corrosion-resistant titanium alloy provided by the present invention includes 0.1~0.5% of Zr, preferably 0.2~0.3%, and more preferably 0.25%. In the present invention, Zr belongs to an easily passivated 5 alloy element, which may reduce the anodic activity of the titanium alloy, thereby its passivation ability is increased, and the corrosion resistance is improved; and at a high temperature, the Zr element may significantly improve the strength of the alloy.
[26] Calculated by the mass percentage, the corrosion-resistant titanium alloy provided by the present invention includes the balance of Ti. In the present invention, the Ti element is a base material, its chemical activity is very high, and a highly stable passive film may be formed on the surface at a room temperature, thereby the corrosion resistance is improved.
[27] The present invention uses Ti as the base material, its chemical activity is very high, and the highly stable passive film may be formed on the surface at the room temperature, thereby the corrosion resistance is improved; the Mo element belongs to the thermodynamic stability element, and may improve the atomic bonding strength of a and B phases, and at the same time, the Mo element is the B stabilized element, which may promote the formation of the B phase, and the B phase may effectively prevent the propagation of the a phase crack, thereby the stress corrosion is effectively weakened; the Ni element added may be alloyed with the Ti element, which may form
Ti2Ni in o-Ti so as to accelerate the cathodic reaction, and improve the corrosion resistance; the Al element is the typical a stable element, it may improve the properties of the alloy by forming the replacement solid solution and then forming the solid solution strengthening effect; and Zr belongs to the easily passivated alloy element, which may reduce the anodic activity of the titanium alloy, thereby its passivation ability is increased, and the corrosion resistance of the titanium alloy is improved.
[28] In the present invention, it is achieved that the titanium alloy has the properties of good corrosion resistance, low elastic modulus, and high strength and toughness, and is suitable for the flexible bearing by a reasonable proportion.
[29] The present invention further provides a preparation method for the corrosion-resistant titanium alloy in the above technical scheme, including the following steps:
[30] (1) performing smelting and casting on a raw material of the corrosion-resistant titanium alloy successively, to obtain a casting piece; and
[31] (2) performing forging-free direct rolling processing, quenching and tempering on the casting piece obtained in the step (1) successively, to obtain the corrosion-resistant titanium alloy.
[32] In the present invention, the smelting and casting are performed on the raw material of the corrosion-resistant titanium alloy successively, to obtain the casting piece.
[33] The present invention has no special restriction on the source of the raw material of the corrosion-resistant titanium alloy, and commercially available products familiar to those skilled in the art may be used.
[34] In the present invention, the smelting is preferably performed in an electron beam cooling bed furnace. The present invention has no special restriction on the model of the electron beam cooling bed furnace, and instruments and devices familiar to those skilled in the art may be used.
[35] In the present invention, the temperature of the smelting is preferably 1726-1826°C, more preferably 1758~1800°C; and the time of the smelting is preferably 10-15 min, more preferably 12-15 min.
[36] In the present invention, the smelting is preferably performed under a vacuum condition; and the vacuum degree under the vacuum condition is preferably <10™* hPa.
[37] In the present invention, a mold is preferably pre-heated before the casting. In the present invention, the temperature of the pre-heating is preferably 300°C; and the holding time of the pre-heating is preferably 2 h. In the present invention, the pre-heating of the mold before the casting may prevent an adverse reaction of water vapor.
[38] The present invention has no special restriction on an operation of the casting,
and casting operations familiar to those skilled in the art may be used.
[39] After the casting piece is obtained, the present invention performs the forging-free direct rolling processing, quenching and tempering on the casting piece successively, to obtain the corrosion-resistant titanium alloy.
[40] In the present invention, the temperature of the forging-free direct rolling processing is preferably 900~950°C, more preferably 920~950°C; and the strain rate of the forging-free direct rolling processing is preferably 0.01~0.1 s°, more preferably 0.05-0.08 s!. The present invention adopts the forging-free direct rolling processing without secondary heating and a cogging forging process, an electron beam (EB) furnace is directly used to smelt an ingot for rolling, so that the whole processing flow is shortened, the energy consumption is reduced, and the cost is reduced.
[41] After the forging-free direct rolling processing is completed, the present invention preferably performs lathe machining and surface painting of Cr0s protective coating on a product obtained by the forging-free direct rolling processing successively.
[42] The present invention has no special restriction on an operation of the lathe machining, and the operation may be performed according to the required part size.
[43] The present invention has no special restriction on the source of the Cr20; protective coating, and commercially available products familiar to those skilled in the art may be used. The present invention has no special restriction on an operation of the painting, and painting operations familiar to those skilled in the art may be used. The present invention has no special restriction on the thickness of the painting, and the thickness familiar to those skilled in the art may be used. In the present invention, the surfacing painting of the Cr20: protective coating may prevent subsequent oxidation in a heat treatment process.
[44] In the present invention, the temperature of the quenching is preferably 800~900°C, more preferably 850°C; and the time of the quenching is preferably 5-10 s, more preferably 5~8 s. In the present invention, the quenching is preferably oil quenching.
[45] In the present invention, the temperature of the tempering is preferably 520~560C, more preferably 540~550°C; the holding time of the tempering is preferably 3~4 h, more preferably 3.5 h; and the cooling of the tempering is preferably air cooling.
[46] The preparation method for the corrosion-resistant titanium alloy provided by the present invention is simple in operation and low in cost. Appropriate steps and parameters are selected, so that materials are mutually combined to play the best role, and have a good application value.
[47] The present invention further provides a corrosion-resistant flexible bearing, and the material of an inner ring and an outer ring of the corrosion-resistant flexible bearing is the corrosion-resistant titanium alloy in the above technical scheme or the corrosion-resistant titanium alloy prepared by the preparation method in the above technical scheme.
[48] In the present invention, a preparation method for the inner ring and the outer ring of the corrosion-resistant flexible bearing is preferably as follows: performing finish turning and ultra precision grinding on the corrosion-resistant titanium alloy successively. The present invention has no special restriction on operations of the finish turning and the ultra precision grinding, and it may be adjusted according to the sizes of the required flexible bearing inner ring and outer ring.
[49] In the present invention, the corrosion-resistant flexible bearing is preferably composed of the outer ring, the inner ring, a cage and a ball; the material of the cage 1s preferably nylon; and the material of the ball is preferably ceramic. The present invention has no special restriction on the source of the cage and ball material, and commercially available products familiar to those skilled in the art may be used.
[50] The present invention has no special restriction on a combination mode of the outer ring, the inner ring, the cage and the ball, and combination modes familiar to those skilled in the art may be used.
[51] The flexible bearing provided by the present invention not only has the excellent corrosion resistance, but also has the characteristics of low elastic modulus,
high strength and toughness, low density, high specific strength and specific fracture toughness, good fatigue strength and crack growth resistance.
[52] The flexible bearing provided by the present invention adopts the outer ring and the inner ring made of the titanium alloy specially designed for a working condition of the acidic medium, it has the characteristics of low elastic modulus and high strength and toughness, and at the same time, the cage and the ball are made of the nylon and ceramic materials with the high corrosion resistance.
[83] A structure schematic diagram of the flexible bearing provided by the present invention is shown in FIG. 1, and it may be seen from FIG. 1 that the flexible bearing includes the corrosion-resistant titanium alloy outer ring, the corrosion-resistant titanium alloy inner ring, the nylon cage and the ceramic ball. [S4] The technical schemes of the present invention are clearly and completely described below in combination with embodiments of the present invention.
Apparently, the embodiments described are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to a scope of protection of the present invention. [S5] Embodiment 1 [S6] Chemical components of a corrosion-resistant titanium alloy are: 0.4% of Mo, 0.5% of Ni, 0.4% of Al, 0.3% of Zr and the balance of Ti according to the mass percentage; and
[57] a preparation method for the corrosion-resistant titanium alloy includes the following steps:
[58] (1) After Mo, Ni, Al, Zr and Ti are weighed and mixed according to the above weight proportion, it is smelted in an electron beam cooling bed furnace with a vacuum degree below 107% hPa, and then rapidly cast in a casting mold, to obtain a casting piece, herein the temperature of the smelting is 1758°C, and the time is 15 min; and the casting mould needs to be pre-heated to 300°C in advance, and the holding time is 2 h;
[59] (2) the casting piece obtained in the step (1) is heated to 900°C, forging-free direct rolling processing is performed, and then it is turned into inner and outer ring blank pieces, after that, a layer of Cr20: protective coating is painted on the surface of the blank piece, subsequently it is heated to 900°C and oil quenching is performed for s, after that, tempering is performed, and it is air-cooled to obtain the 5 corrosion-resistant titanium alloy, herein the strain rate of the forging-free direct rolling processing is 0.1 st; and the temperature of the tempering is 540°C, and the holding time of the tempering is 4 h.
[60] Application example 1
[61] Finish turning and ultra precision grinding are performed on the corrosion-resistant titanium alloy prepared in Embodiment 1 successively, to obtain an inner ring and an outer ring of a flexible bearing, and then the inner ring and the outer ring are assembled with a cage and a ceramic ball, to obtain the flexible bearing.
[62] Embodiment 2
[63] Chemical components of a corrosion-resistant titanium alloy are: 0.1% of Mo, 0.6% of Ni, 0.3% of Al, 0.2% of Zr and the balance of Ti according to the mass percentage; and
[64] a preparation method for the corrosion-resistant titanium alloy includes the following steps:
[65] (1) After Mo, Ni, Al, Zr and Ti are weighed and mixed according to the above weight proportion, it is smelted in an electron beam cooling bed furnace with a vacuum degree below 107% hPa, and then rapidly cast in a casting mold, to obtain a casting piece, herein the temperature of the smelting is 1758°C, and the time is 15 min; and the casting mould needs to be pre-heated to 300°C in advance, and the holding time is 2 h;
[66] (2) the casting piece obtained in the step (1) is heated to 950°C, forging-free direct rolling processing is performed, and then it is turned into inner and outer ring blank pieces, after that, a layer of Cr203 protective coating is painted on the surface of the blank piece, subsequently it is heated to 900°C and oil quenching is performed for 5 s, after that, tempering is performed, and it is air-cooled to obtain the corrosion-resistant titanium alloy, herein the strain rate of the forging-free direct rolling processing is 0.1 st; and the temperature of the tempering is 550°C, and the holding time of the tempering is 3 h.
[67] Application example 2
[68] Finish turning and ultra precision grinding are performed on the corrosion-resistant titanium alloy prepared in Embodiment 2 successively, to obtain an inner ring and an outer ring of a flexible bearing, and then the inner ring and the outer ring are assembled with a cage and a ceramic ball, to obtain the flexible bearing.
[69] The flexible bearings prepared by Application examples 1 and 2 are put into 3.5% NaCl solution for a corrosion resistance test, herein an open circuit potential curve of the flexible bearings prepared by Application examples 1 and 2 in 3.5% NaCl solution is shown in FIG. 2, a polarization curve is shown in FIG. 3, and corrosion resistance test results are shown in Table 1.
[70] Table 1: Test results of open circuit potential, corrosion potential and corrosion current density of flexible bearing in 3.5% NaCl solution
[71] op en Corrosion current
Open circuit potential/V potential/V density/uAscm?
Embodiment doa | -0.486
[72] It may be seen from Table 1 that the open circuit potentials of the flexible bearings prepared by Application examples 1 and 2 in 3.5% NaCl solution are -0.466V, and its corrosion potentials and current densities are -0.482 V, -0.486 V and 12.788 pA *cm?, 19.289 pAscm™ respectively, they all have the excellent corrosion resistance, and may be served in the acidic medium for a long time.
[73] It may be seen from the above embodiments and application examples that the corrosion-resistant titanium alloy provided by the present invention has the excellent corrosion resistance, and it is prepared into the inner and outer rings of the flexible bearing so that the flexible bearing may be served in the acidic medium for a long time.
[74] The above are only preferred implementation modes of the present invention.
It should be pointed out that for those of ordinary skill in the art, a plurality of improvements and modifications may also be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the scope of protection of the present invention.
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