A surface-textured wear-resistant alloy for oil-free lubricated cylinder liners and a method for producing the same
By preparing surface-textured wear-resistant alloys, the wear problem of oil-free lubricated cylinder liners under high temperature and high frequency conditions was solved, and the hardness and friction resistance were improved, making them suitable for the complex working conditions of hot air engines.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 江苏华晨气缸套股份有限公司
- Filing Date
- 2026-05-11
- Publication Date
- 2026-06-05
AI Technical Summary
Existing oilless lubricated cylinder liners are prone to oil film loss, increased friction coefficient, accelerated wear, and deteriorated sealing performance under high temperature, high frequency reciprocating motion, and boundary/dry friction conditions. Furthermore, existing surface strengthening treatments or coatings are prone to adhesive wear and peeling under these conditions, resulting in low bonding strength and complex and expensive preparation.
The preparation method of surface textured wear-resistant alloy is adopted. By mixing elemental powders such as titanium, molybdenum, vanadium, copper, and iron with wear-resistant fillers, hot pressing sintering and graded honing are carried out to form a dense matrix and microstructure. In combination with silane coupling agent to modify silica, wear-resistant fillers are prepared to form a tungsten carbide particle structure with silica as the core, which enhances mechanical interlocking force and reduces adhesive wear.
It improves the hardness and friction resistance of oil-free lubricated cylinder liners, reduces the wear rate, forms a stable composite lubrication mechanism, and adapts to the complex application environment of hot air engines.
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Figure CN122147195A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wear-resistant alloy technology, specifically to a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners and its preparation method. Background Technology
[0002] As an external combustion heat engine, the hot air engine boasts significant advantages such as high thermal efficiency, quiet operation, low emissions, and wide fuel adaptability. Its closed-loop system uses helium or hydrogen as the working fluid. To avoid contamination of the working medium by traditional lubricating oil, which could lead to seal failure or performance degradation, oil-free or lean lubrication methods are typically employed. However, under harsh conditions such as high temperature, high-frequency reciprocating motion, and boundary / dry friction, traditional cylinder liner surfaces are prone to problems such as oil film loss, a sharp increase in the coefficient of friction, accelerated wear, cylinder scoring, and seizing. This directly results in deteriorated sealing performance, reduced energy conversion efficiency, and a significantly shortened service life, making it difficult to meet the requirements for reliable, maintenance-free operation. In existing technologies, surface strengthening treatments (such as laser hardening, ion nitriding, chromium plating, or ceramic coatings) can improve the hardness of the substrate to some extent, but severe adhesive wear and coating peeling still easily occur under dry friction conditions. While wear-resistant alloy coatings possess a certain degree of self-lubrication, their bonding strength with the cylinder liner metal substrate is low, and their manufacturing process is complex and costly, making them unsuitable for the complex application environment of hot air engines.
[0003] Chinese invention patent CN111363971A discloses a low-molybdenum niobium alloy cast iron cylinder liner, its preparation method, and the ferroalloy. The ferroalloy comprises the following components by mass percentage: 2.8-3.0% C; 1.6-2.3% Si; 0.1-0.2% Mo; 0.1-0.18% Nb; 0.05-0.1% S; less than 0.1% P; less than 0.3% Mn; with the balance being Fe. This invention optimizes the elemental content in the cylinder liner, giving it good mechanical properties and high corrosion resistance. The cylinder liner matrix is mainly composed of fine lamellar pearlite, which is stable, resistant to phase transformation, and corrosion, resulting in excellent performance. However, its wear resistance needs further improvement. Summary of the Invention
[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners and its preparation method.
[0005] A method for preparing a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners includes the following steps: (1) Weigh out the following by weight: 1-1.5 parts carbon powder, 2-4 parts titanium powder, 1-3 parts molybdenum powder, 0.5-1.5 parts vanadium powder, 4-6 parts nickel powder, 5-8 parts copper powder, 8-10 parts wear-resistant filler, and 60-70 parts iron powder. (2) After mixing the above raw materials, ball milling is used to obtain powder. The powder is placed in a mold and hot-pressed and sintered to obtain a precursor. (3) The precursor is subjected to coarse honing and fine honing to obtain a surface textured wear-resistant alloy.
[0006] The wear-resistant filler is tungsten carbide coated with silicon dioxide.
[0007] In step (2), the hot pressing sintering temperature is 1100-1200℃, the pressure is 20-25MPa, and the time is 1-2h.
[0008] In step (3), the spindle speed of the rough honing is 150-250 rpm, the reciprocating speed is 8-15 m / min, the honing pressure is 0.3-0.6 MPa, and the machining allowance is 0.03-0.07 mm.
[0009] In step (3), the spindle speed of the fine honing is 200-300 rpm, the reciprocating speed is 10-20 m / min, the honing pressure is 0.2-0.4 MPa, and the machining allowance is 0.001-0.01 mm.
[0010] The wear-resistant filler is prepared by the following method: S1: Mix aqueous ethanol solution and nano-silica, add silane coupling agent, and heat to react to obtain modified silica; S2: Add modified silica to ammonium metatungstate solution, stir and mix well, dry, put into tube furnace and calcine to obtain wear-resistant filler.
[0011] In step S1, the average particle size of the nano-silica is 15-60 nm; the silane coupling agent is γ-aminopropyltriethoxysilane.
[0012] In step S1, the mass ratio of the nano-silica to the silane coupling agent is (10-12):1.
[0013] In step S2, the mass ratio of the modified silica to ammonium metatungstate is (4-5):1.
[0014] In step S2, the calcination temperature is 850-950℃ and the time is 2-4h.
[0015] A surface-textured wear-resistant alloy for oil-free lubricated cylinder liners is prepared by the above method.
[0016] Due to the adoption of the above technical solutions, the beneficial effects of the present invention include: The surface-textured wear-resistant alloy for oil-free lubricated cylinder liners prepared by this invention has excellent hardness and friction resistance. Attached Figure Description
[0017] Figure 1 X-ray diffraction pattern of the wear-resistant filler prepared in Example 2; Figure 2 The image shows a scanning electron microscope (SEM) image of the wear-resistant filler prepared in Example 2. Detailed Implementation
[0018] Example 1: Preparation of anti-wear filler S1: Mix 500 ml of 70 wt% ethanol aqueous solution and 50 g of nano silica (average particle size of 15 nm) with stirring. Add 5 g of γ-aminopropyltriethoxysilane, heat to reflux for 8 h, cool to room temperature, filter, wash with 70 wt% ethanol aqueous solution (3 × 50 ml), and vacuum dry at 60 °C for 12 h to obtain modified silica. S2: Add 40g of modified silica to 150ml of deionized water containing 10g of ammonium metatungstate, stir and mix well, heat to 80℃ and stir until completely evaporated, put the remaining solid into a tube furnace, introduce nitrogen gas (flow rate of 200ml / min) for 30min, then introduce a mixture of methane and hydrogen gas (volume ratio of methane to hydrogen of 1:4) (flow rate of 200ml / min), and simultaneously heat to 850℃ at a rate of 3℃ / min, hold at this temperature for 4h, and allow to cool naturally to room temperature to obtain the wear-resistant filler.
[0019] Example 2 Preparation of anti-wear filler S1: Mix 500 ml of 70 wt% ethanol aqueous solution and 55 g of nano silica (average particle size of 30 nm) with stirring. Add 5 g of γ-aminopropyltriethoxysilane, heat to reflux for 8 h, cool to room temperature, filter, wash with 70 wt% ethanol aqueous solution (3 × 50 ml), and vacuum dry at 60 °C for 12 h to obtain modified silica. S2: Add 45g of modified silica to 150ml of deionized water containing 10g of ammonium metatungstate, stir and mix well, heat to 80℃ and stir until completely evaporated, put the remaining solid into a tube furnace, introduce nitrogen gas (flow rate of 200ml / min) for 30min, then introduce a mixture of methane and hydrogen gas (volume ratio of methane to hydrogen of 1:4) (flow rate of 200ml / min), and simultaneously heat to 900℃ at a rate of 3℃ / min, hold at that temperature for 3h, and naturally cool to room temperature to obtain the wear-resistant filler.
[0020] Figure 1The image shows the X-ray diffraction pattern of the wear-resistant filler. Within the 10°-40° range, the spectrum exhibits a distinct, broad, and raised amorphous diffraction band, a typical characteristic signal of amorphous silica. Above the amorphous band, several sharp and high-intensity crystalline diffraction peaks are superimposed, located at 31.5°, 35.6°, 48.3°, 64.0°, 73.1°, 75.5°, and 77.1°, corresponding to the (001), (100), (110), (002), (200), and (102) crystal planes of tungsten carbide, respectively. This indicates that tungsten carbide in the sample is mainly deposited on the silica surface in a crystalline hexagonal phase.
[0021] Figure 2 The image shows a scanning electron microscope (SEM) image of the wear-resistant filler. As can be seen from the image, the wear-resistant filler particles are nanoscale spherical particles with relatively rough surfaces. The particles are relatively uniform, and the particle surfaces have relatively uniform and obvious granular protrusions.
[0022] Example 3 Preparation of anti-wear filler S1: Mix 500 ml of 70 wt% ethanol aqueous solution and 60 g of nano silica (average particle size of 60 nm) with stirring. Add 5 g of γ-aminopropyltriethoxysilane, heat to reflux for 8 h, cool to room temperature, filter, wash with 70 wt% ethanol aqueous solution (3 × 50 ml), and vacuum dry at 60 °C for 12 h to obtain modified silica. S2: Add 50g of modified silica to 150ml of deionized water containing 10g of ammonium metatungstate, stir and mix well, heat to 80℃ and stir until completely evaporated, put the remaining solid into a tube furnace, introduce nitrogen gas (flow rate of 200ml / min) for 30min, then introduce a mixture of methane and hydrogen gas (volume ratio of methane to hydrogen of 1:4) (flow rate of 200ml / min), and simultaneously heat to 950℃ at a rate of 3℃ / min, hold at that temperature for 2h, and naturally cool to room temperature to obtain the wear-resistant filler.
[0023] Example 4: Preparation of surface-textured wear-resistant alloy for oil-free lubricated cylinder liners (1) Weigh out: 1g carbon powder, 2g titanium powder, 1g molybdenum powder, 0.5g vanadium powder, 4g nickel powder, 5g copper powder, 8g anti-wear filler (prepared in Example 1), and 60g iron powder; (2) The above raw materials are added to a ball mill in sequence, using grinding balls with diameters of 5 mm and 10 mm. The weight ratio of 5 mm grinding balls to 10 mm grinding balls is 3:1, and the ball-to-material ratio is 5:1. The ball milling is carried out in an argon atmosphere, grinding at 100 r / min for 10 min, stopping for 5 min, and grinding for 5 h to obtain powder. The powder is loaded into a mold and placed in a vacuum hot press furnace. The temperature is raised to 1100℃ at a rate of 10℃ / min, the pressure is set to 20 MPa, and the temperature is held for 2 h. The material is then naturally cooled to room temperature, demolded, and the precursor is obtained. (3) The precursor is subjected to rough honing. The rough honing parameters are set as follows: spindle speed is 150 rpm, reciprocating speed is 8 m / min, honing pressure is 0.3 MPa, and machining allowance is 0.03 mm. Then, fine honing is performed. The fine honing parameters are set as follows: spindle speed is 200 rpm, reciprocating speed is 10 m / min, honing pressure is 0.2 MPa, and machining allowance is 0.001 mm to obtain a surface textured wear-resistant alloy.
[0024] Example 5: Preparation of surface-textured wear-resistant alloy for oil-free lubricated cylinder liners (1) Weigh out: 1.2g carbon powder, 2.5g titanium powder, 2g molybdenum powder, 1g vanadium powder, 5g nickel powder, 7g copper powder, 9g anti-wear filler (prepared in Example 2), and 65g iron powder; (2) The above raw materials are added to a ball mill in sequence, using grinding balls with diameters of 5 mm and 10 mm. The weight ratio of 5 mm grinding balls to 10 mm grinding balls is 3:1, and the ball-to-material ratio is 5:1. The ball milling is carried out in an argon atmosphere, grinding at 100 r / min for 10 min, stopping for 5 min, and grinding for 5 h to obtain powder. The powder is loaded into a mold and placed in a vacuum hot press furnace. The temperature is raised to 1150°C at a rate of 10°C / min, the pressure is set to 22 MPa, and the temperature is held for 1.5 h. The mixture is then naturally cooled to room temperature and demolded to obtain the precursor. (3) The precursor is subjected to rough honing. The rough honing parameters are set as follows: spindle speed is 200 rpm, reciprocating speed is 10 m / min, honing pressure is 0.5 MPa, and machining allowance is 0.04 mm. Then, fine honing is performed. The fine honing parameters are set as follows: spindle speed is 250 rpm, reciprocating speed is 15 m / min, honing pressure is 0.3 MPa, and machining allowance is 0.005 mm to obtain a surface textured wear-resistant alloy.
[0025] Example 6: Preparation of surface-textured wear-resistant alloy for oil-free lubricated cylinder liners (1) Weigh out: 1.5g carbon powder, 4g titanium powder, 3g molybdenum powder, 1.5g vanadium powder, 6g nickel powder, 8g copper powder, 10g anti-wear filler (prepared in Example 3), and 70g iron powder; (2) The above raw materials are added to a ball mill in sequence, using grinding balls with diameters of 5 mm and 10 mm. The weight ratio of 5 mm grinding balls to 10 mm grinding balls is 3:1, and the ball-to-material ratio is 5:1. The ball milling is carried out in an argon atmosphere, grinding at 100 r / min for 10 min, stopping for 5 min, and grinding for 5 h to obtain powder. The powder is loaded into a mold and placed in a vacuum hot press furnace. The temperature is raised to 1200℃ at a rate of 10℃ / min, the pressure is set to 25 MPa, and the temperature is held for 1 h. The mixture is then naturally cooled to room temperature, demolded, and the precursor is obtained. (3) The precursor is subjected to rough honing. The rough honing parameters are set as follows: spindle speed is 250 rpm, reciprocating speed is 15 m / min, honing pressure is 0.6 MPa, and machining allowance is 0.07 mm. Then, fine honing is performed. The fine honing parameters are set as follows: spindle speed is 300 rpm, reciprocating speed is 20 m / min, honing pressure is 0.4 MPa, and machining allowance is 0.01 mm to obtain a surface textured wear-resistant alloy.
[0026] Comparative Example 1 (1) Weigh out: 1.2g carbon powder, 2.5g titanium powder, 2g molybdenum powder, 1g vanadium powder, 5g nickel powder, 7g copper powder, 9g anti-wear filler (prepared in Example 2), and 65g iron powder; (2) The above raw materials are added to a ball mill in sequence, using grinding balls with diameters of 5 mm and 10 mm. The weight ratio of 5 mm grinding balls to 10 mm grinding balls is 3:1, and the ball-to-material ratio is 5:1. The ball milling is carried out in an argon atmosphere, grinding at 100 r / min for 10 min, stopping for 5 min, and grinding for 5 h to obtain powder. The powder is loaded into a mold and placed in a vacuum hot press furnace. The temperature is raised to 1150°C at a rate of 10°C / min, the pressure is set to 22 MPa, and the temperature is held for 1.5 h. The mixture is then naturally cooled to room temperature and demolded to obtain the precursor. (3) The precursor is honed. The honing parameters are set as follows: spindle speed is 200 rpm, reciprocating speed is 10 m / min, honing pressure is 0.5 MPa, and machining allowance is 0.04 mm to obtain a surface textured wear-resistant alloy.
[0027] Comparative Example 2 (1) Weigh out: 1g carbon powder, 2g titanium powder, 1g molybdenum powder, 0.5g vanadium powder, 4g nickel powder, 5g copper powder, 8g anti-wear filler (prepared in Example 1), and 60g iron powder; (2) Mix the above raw materials, heat to 1700℃ to melt, pour into a mold, cool naturally to room temperature, demold, and obtain the precursor; (3) The precursor is subjected to rough honing. The rough honing parameters are set as follows: spindle speed is 150 rpm, reciprocating speed is 8 m / min, honing pressure is 0.3 MPa, and machining allowance is 0.03 mm. Then, fine honing is performed. The fine honing parameters are set as follows: spindle speed is 200 rpm, reciprocating speed is 10 m / min, honing pressure is 0.2 MPa, and machining allowance is 0.001 mm to obtain a surface textured wear-resistant alloy.
[0028] Comparative Example 3 The preparation method of the surface textured wear-resistant alloy for oil-free lubricated cylinder liners is basically the same as that in Example 5, except that the amount of anti-wear filler added in the composition is replaced with 2g.
[0029] Comparative Example 4 The preparation method of the surface-textured wear-resistant alloy for oil-free lubricated cylinder liners is basically the same as that in Example 5, except that the wear-resistant filler is replaced with an equal weight of the wear-resistant filler prepared by the following method: 45g of nano-silica (average particle size of 30nm) was added to 150ml of deionized water containing 10g of ammonium metatungstate, stirred and mixed, heated to 80℃ and stirred until completely evaporated, the remaining solid was placed in a tube furnace, nitrogen gas (flow rate of 200ml / min) was introduced for 30min, and then a mixture of methane and hydrogen gas (volume ratio of methane to hydrogen of 1:4, flow rate of 200ml / min) was introduced, and the temperature was raised to 900℃ at a rate of 3℃ / min, held for 3h, and then naturally cooled to room temperature to obtain the wear-resistant filler.
[0030] Comparative Example 5 The preparation method of the surface-textured wear-resistant alloy for oil-free lubricated cylinder liners is basically the same as that in Example 5, except that the wear-resistant filler is replaced with an equal weight of the wear-resistant filler prepared by the following method: The preparation method of the anti-wear filler is basically the same as that in Example 2, except that the nano silica with an average particle size of 15 nm in step S1 is replaced with an equal weight of nano silica with a D50 of 500 nm (model CUP-SI-500nm, produced by Beijing Nanomicro Standard Technology Co., Ltd.).
[0031] Comparative Example 6 The preparation method of the surface-textured wear-resistant alloy for oil-free lubricated cylinder liners is basically the same as that in Example 5, except that the wear-resistant filler is replaced with an equal weight of the wear-resistant filler prepared by the following method: The preparation method of the wear-resistant filler is basically the same as that in Example 2, except that the γ-aminopropyltriethoxysilane in step S1 is replaced with an equal weight of γ-aminopropylmethyldiethoxysilane.
[0032] Comparative Example 7 The preparation method of the surface-textured wear-resistant alloy for oil-free lubricated cylinder liners is basically the same as that in Example 5, except that the wear-resistant filler is replaced with an equal weight of the wear-resistant filler prepared by the following method: The preparation method of the anti-wear filler is basically the same as that in Example 2, except that the amount of γ-aminopropyltriethoxysilane added in step S1 is replaced with 1g.
[0033] Comparative Example 8 The preparation method of the surface-textured wear-resistant alloy for oil-free lubricated cylinder liners is basically the same as that in Example 5, except that the wear-resistant filler is replaced with an equal weight of the wear-resistant filler prepared by the following method: The preparation method of the wear-resistant filler is basically the same as that in Example 2, except that the amount of γ-aminopropyltriethoxysilane added in step S1 is replaced with 10g.
[0034] Comparative Example 9 The preparation method of the surface-textured wear-resistant alloy for oil-free lubricated cylinder liners is basically the same as that in Example 5, except that the wear-resistant filler is replaced with an equal weight of wear-resistant filler prepared by the following method: The preparation method of the wear-resistant filler is basically the same as that in Example 2, except that the amount of ammonium metatungstate added in step S2 is replaced with 5g.
[0035] Comparative Example 10 The preparation method of the surface-textured wear-resistant alloy for oil-free lubricated cylinder liners is basically the same as that in Example 5, except that the wear-resistant filler is replaced with an equal weight of wear-resistant filler prepared by the following method: The preparation method of the wear-resistant filler is basically the same as that in Example 2, except that the amount of ammonium metatungstate added in step S1 is replaced with 40g.
[0036] The nano-silica used in the embodiments and comparative examples of this application are DK-SiO2-15 (average particle size of 15nm), DK-SiO2-30 (average particle size of 30nm), and DK-SiO2-60 (average particle size of 60nm), respectively, and are produced by Suzhou Meibang Nanomaterials Co., Ltd.
[0037] The surface-textured wear-resistant alloys for oil-free lubricated cylinder liners prepared in the examples and comparative examples were tested for hardness and wear resistance. The test results are shown in Table 1.
[0038] Hardness Testing: The hardness of the textured wear-resistant alloy was tested using a Vickers hardness tester. The test load was set to 1 kg, and the loading time was 10 s. The length of the diagonal of the indentation was then measured using a reading microscope, and the Vickers hardness H was calculated using the following formula:
[0039] Where R is the applied load; d is the average value of the two diagonals of the indentation.
[0040] Wear resistance testing: An MS-T3000 ball-and-disc friction and wear tester was used to conduct wear tests on the surface-textured wear-resistant alloy under dry sliding conditions. The test employed a reciprocating linear motion with ball-to-surface contact. The friction pair consisted of a 3mm diameter cemented carbide ball. The test load was 4N, the reciprocating frequency was 10Hz, the stroke length was 10mm, and the test wear time was 60min. The volume of the wear track profile was measured using an optical profilometer, and the wear rate was calculated using the volumetric method, as shown in the following formula:
[0041] Where L is the sliding distance; V is the wear volume; This is the normal load.
[0042] Table 1 Performance Test Data
[0043] As can be seen from the data in Table 1, the surface-textured wear-resistant alloy for oil-free lubricated cylinder liners prepared by the present invention has excellent hardness and friction resistance.
[0044] This invention employs a vacuum hot-pressing sintering process and introduces transition metal elements such as titanium, molybdenum, and vanadium into the alloy system to construct a dense matrix structure, reducing microscopic collapse during friction. A silane coupling agent is used to covalently graft amino groups onto the silica surface, anchoring the tungsten source through charge adsorption and reducing it to tungsten carbide, forming an anti-wear filler with silica as the core and tungsten carbide deposition. This anti-wear filler generates grain boundary pinning and dislocation hindering effects in the alloy matrix, forcing dislocation lines to bypass the high-hardness filler particles under stress, thereby increasing the hardness of the wear-resistant alloy. Its nanoscale spherical surface has a granular protrusion structure, which enhances the mechanical interlocking force between the filler and the alloy matrix, and the high-modulus tungsten carbide shell reduces cutting indentation, improving wear resistance. Furthermore, a graded honing process creates surface texture; its micro-pit structure captures hard wear debris, reducing abrasive wear, and decreasing the contact area, weakening interatomic adhesion and reducing adhesive wear. This deep synergy between micro-fillers and macro-texture ultimately forms a stable composite lubrication mechanism, reducing the wear rate of wear-resistant alloys.
[0045] The surface-textured wear-resistant alloy prepared in Comparative Example 1 underwent only one honing process, resulting in high surface roughness and uneven peak-valley distribution, making it difficult to form a stable friction-reducing interface, leading to an increased friction coefficient and accelerated wear. The surface-textured wear-resistant alloy prepared in Comparative Example 2 using melt casting is prone to elemental segregation during casting, resulting in coarse grains and an inability to form a uniformly distributed, dispersed reinforcing phase, thus reducing alloy hardness. In Comparative Example 5, the increased particle size of the anti-wear filler carrier particles led to a decrease in the specific surface area of the particles, reducing the active sites for silane coupling agent grafting and subsequent anchoring of tungstate ions, affecting the in-situ uniform growth of the tungsten carbide phase, thereby weakening the overall microscopic hardness support of the alloy and increasing the wear rate. In Comparative Example 8, the wear-resistant filler used excessive amounts of γ-aminopropyltriethoxysilane during preparation. The excess silane molecules underwent a condensation reaction in the presence of water, forming a polysiloxane network that coated silica. This resulted in uneven tungsten carbide shell coating, reducing the hardness and wear resistance of the wear-resistant alloy and increasing the wear rate. In Comparative Example 10, the wear-resistant filler contained excessive amounts of ammonium metatungstate, which may have led to an excessively thick WC layer, increased brittleness, and a tendency for micro-fragmentation, further increasing the wear rate.
[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. However, any modifications, alterations, and variations made by those skilled in the art without departing from the scope of the present invention based on the disclosed technical content are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.
Claims
1. A method for preparing a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners, characterized in that, Includes the following steps: (1) Weigh out the following by weight: 1-1.5 parts carbon powder, 2-4 parts titanium powder, 1-3 parts molybdenum powder, 0.5-1.5 parts vanadium powder, 4-6 parts nickel powder, 5-8 parts copper powder, 8-10 parts wear-resistant filler, and 60-70 parts iron powder. (2) After mixing the above raw materials, ball milling is used to obtain powder. The powder is placed in a mold and hot-pressed and sintered to obtain a precursor. (3) The precursor is subjected to coarse honing and fine honing to obtain a surface-textured wear-resistant alloy; The wear-resistant filler is tungsten carbide coated with silicon dioxide.
2. The method for preparing a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners according to claim 1, characterized in that, In step (2), the hot pressing sintering temperature is 1100-1200℃, the pressure is 20-25MPa, and the time is 1-2h.
3. The method for preparing a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners according to claim 1, characterized in that, In step (3), the spindle speed of the rough honing is 150-250 rpm, the reciprocating speed is 8-15 m / min, the honing pressure is 0.3-0.6 MPa, and the machining allowance is 0.03-0.07 mm.
4. The method for preparing a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners according to claim 1, characterized in that, In step (3), the spindle speed of the fine honing is 200-300 rpm, the reciprocating speed is 10-20 m / min, the honing pressure is 0.2-0.4 MPa, and the machining allowance is 0.001-0.01 mm.
5. The method for preparing a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners according to claim 1, characterized in that, The wear-resistant filler is prepared by the following method: S1: Mix aqueous ethanol solution and nano-silica, add silane coupling agent, and heat to react to obtain modified silica; S2: Add modified silica to ammonium metatungstate solution, stir and mix well, dry, put into tube furnace and calcine to obtain wear-resistant filler.
6. The method for preparing a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners according to claim 5, characterized in that, In step S1, the average particle size of the nano-silica is 15-60 nm; the silane coupling agent is γ-aminopropyltriethoxysilane.
7. The method for preparing a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners according to claim 5, characterized in that, In step S1, the mass ratio of the nano-silica to the silane coupling agent is (10-12):
1.
8. The method for preparing a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners according to claim 5, characterized in that, In step S2, the mass ratio of the modified silica to ammonium metatungstate is (4-5):
1.
9. The method for preparing a surface-textured wear-resistant alloy for oil-free lubricated cylinder liners according to claim 5, characterized in that, In step S2, the calcination temperature is 850-950℃ and the time is 2-4h.
10. A surface-textured wear-resistant alloy for oil-free lubricated cylinder liners, characterized in that, It is obtained by the preparation method according to any one of claims 1-9.