High-toughness cermet composite spring and method for manufacturing same

Abstract

The application provides a high-toughness cermet composite spring and a preparation method thereof, and relates to the field of ceramic springs. The preparation method of the high-toughness cermet composite spring comprises the following steps: preparing a silicon nitride granulated powder, chemical nickel plating, heat pressing treatment and spring processing. The preparation method of the high-toughness cermet composite spring effectively improves the compactness, high-temperature bending resistance and fracture toughness of the ceramic spring while improving the compression rate of the ceramic spring and further improving the temperature resistance of the ceramic spring.

Description

Technical Field

[0001] This invention relates to the field of ceramic springs, and in particular to a high-toughness metal-ceramic composite spring and its preparation method. Background Technology

[0002] Metallic materials (such as steel, iron, copper, aluminum, nickel, and their alloys) possess excellent ductility. For example, when used to manufacture springs, they can achieve high compressibility (20%-70%), and even compressibility. Springs made from metallic materials exhibit excellent elasticity and load-bearing capacity, effectively performing functions such as buffering, shock absorption, positioning, and force measurement. They are widely used in aerospace, medical, electrical, transportation, bridge, and construction industries.

[0003] However, the temperature resistance of metallic materials is limited, making them suitable only for applications below 800℃. Their long-term stability in high-temperature environments is poor. When used for extended periods (greater than 2 hours) at 800℃, they exhibit softening creep, reduced working stroke, and decreased load-bearing capacity.

[0004] Ceramic materials possess the advantage of high-temperature resistance, enabling them to operate stably for extended periods in environments exceeding 800°C. However, existing ceramic springs exhibit certain deficiencies in density, high-temperature bending resistance, and fracture toughness, resulting in a maximum compression ratio of only 25%, severely limiting the further expansion of their applications. Furthermore, the temperature resistance of ceramic springs requires further improvement.

[0005] Based on this, a high-toughness metal-ceramic composite spring and its preparation method are provided. While specifically improving the density, high-temperature bending resistance and fracture toughness of the ceramic spring, the compression ratio of the ceramic spring is effectively improved, and its temperature resistance is further improved. This has important technical significance and research value. Summary of the Invention

[0006] To address the technical problems existing in the prior art, this invention provides a method for preparing a high-toughness metal-ceramic composite spring. This method effectively improves the density, high-temperature bending resistance, and fracture toughness of the ceramic spring, while also increasing its compression ratio and further enhancing its temperature resistance. This invention also provides a high-toughness metal-ceramic composite spring prepared using the aforementioned method.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] A method for preparing a high-toughness metal-ceramic composite spring includes the following steps: preparing silicon nitride granulated powder, electroless nickel plating, hot pressing treatment, and spring processing;

[0009] The method for preparing silicon nitride granulated powder is as follows: silicon nitride powder, ferric nitrate, aluminum sol, polystyrene microspheres, and deionized water are mixed and ball-milled to obtain a composite powder slurry; the composite powder slurry is then microwave-vacuum dried to obtain silicon nitride granulated powder.

[0010] The method for electroless nickel plating is as follows: silicon nitride granulated powder is immersed in hydrochloric acid solution, washed with water and dried to obtain a pretreated material; the pretreated material is immersed in magnesium chloride solution, and the solid is separated and collected to obtain an impregnated material; the impregnated material is placed in a nickel plating solution and electroless nickel plating is performed at a temperature of 85-95°C, the solid is separated and collected, and the solid is heat-treated to obtain nickel-plated powder;

[0011] The nickel plating solution is a deionized aqueous solution containing nickel sulfate hexahydrate, sodium hypophosphite, lactic acid, and boric acid.

[0012] Furthermore, the hot pressing method involves filling nickel-plated powder into a mold, and then hot pressing it under inert gas protection to obtain a hollow cylindrical composite material block.

[0013] The spring is manufactured by processing the composite material block through a spiral wire cutting process to obtain a high-toughness metal-ceramic composite spring.

[0014] Preferably, in the preparation of silicon nitride granulated powder, the mass ratio of silicon nitride powder, ferric nitrate, aluminum sol, polystyrene microspheres, and deionized water is 90-92:1-3:5-8:9-15:90-120.

[0015] The silicon nitride powder is a mixture of α-phase silicon nitride powder and β-phase silicon nitride powder, with a mass ratio of α-phase silicon nitride powder to β-phase silicon nitride powder of 30-40:60-70.

[0016] The purity of ferric nitrate is >99.9 wt%;

[0017] The solid content of the aluminum sol is >40 wt%;

[0018] The average particle size of polystyrene microspheres is 2-3 μm.

[0019] Preferably, in the preparation of silicon nitride granulated powder, the ball milling speed is 500-800 r / min and the ball milling time is 2-5 h;

[0020] The vacuum degree of microwave vacuum drying is 0.096-0.1MPa, the microwave frequency is 900-2500MHz, the microwave power is 200-1000w, and the microwave vacuum drying time is 10-12h.

[0021] Preferably, in the electroless nickel plating, the volume ratio of silicon nitride granulated powder to hydrochloric acid solution is 1:2-3, and the concentration of hydrochloric acid solution is 10-12 wt%.

[0022] The impregnation time of silicon nitride granulated powder in hydrochloric acid solution is 10-20 min;

[0023] Wash with water until the pH reaches 5-7.

[0024] Preferably, in the electroless nickel plating, the volume ratio of the pretreatment material to the magnesium chloride solution is 1:1-2, and the concentration of the magnesium chloride solution is 20-30 wt%.

[0025] The pretreatment material is immersed in magnesium chloride solution for 30-40 minutes.

[0026] Preferably, in the electroless nickel plating, the volume ratio of the impregnating material to the nickel plating solution is 1:1-2;

[0027] The electroless nickel plating process at 85-95℃ takes 2-4 hours.

[0028] The heat treatment temperature is 200-400℃, and the heat treatment time is 1-2 hours.

[0029] Preferably, in the electroless nickel plating, the nickel plating solution contains 80-90 g / L of nickel sulfate hexahydrate, 25-30 g / L of sodium hypophosphite, 10-20 g / L of lactic acid, and 5-8 g / L of boric acid.

[0030] Preferably, in the hot pressing process, the hot pressing pressure is 20-50 MPa, the hot pressing temperature is 1400-1700℃, and the hot pressing time is 2-2.5 h.

[0031] A high-toughness metal-ceramic composite spring prepared by the aforementioned method has a compression ratio of 40.9-45.0%.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] (1) The preparation method of the high-toughness metal-ceramic composite spring of the present invention, in the process of preparing silicon nitride granulated powder, iron ions and aluminum ions are used to coat silicon nitride material, which acts as plasticizing agents in the later sintering process to bind silicon nitride particles and improve sintering driving force; at the same time, the liquefaction of iron will also cause an increase in volume, generating compressive stress on the surrounding particles, causing plastic movement, thereby improving the density and high-temperature flexural strength of the material. In the chemical nickel plating and hot pressing treatment, after the silicon nitride granulated powder is chemically nickel plated, it is hot pressed to obtain a composite material block with a stacked biomimetic structure of Ni-P alloy and silicon nitride interleaved, which effectively achieves complementary advantages and is conducive to improving the fracture toughness of the material, increasing the fracture toughness of the material block from 7.5 MPa·m in Comparative Example 1. 1 / 2 Increased to 12.99 MPa·m for composite materials. 1 / 2 This invention combines the temperature resistance of silicon nitride with the fracture elongation characteristics of alloy materials by compositing silicon nitride with nickel alloys. The resulting metal-ceramic composite spring exhibits both excellent temperature resistance and compression performance.

[0034] (2) The high-toughness metal-ceramic composite spring of the present invention has a compression rate of 40.9-45.0%, a density of 96.7-97.3%, a high temperature (1000℃) bending strength of 502-514MPa, and a maximum long-term service temperature of 1200℃.

[0035] (3) The preparation method of the high toughness metal ceramic composite spring of the present invention has easy-to-obtain raw materials, simple process flow, easy-to-control preparation process, and is conducive to large-scale industrial production. Detailed Implementation

[0036] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described. It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, "first," "second," etc., are used to distinguish similar objects and are not used to describe a particular order or sequence. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] This invention provides a method for preparing a high-toughness metal-ceramic composite spring, comprising the following steps: preparing silicon nitride granulated powder, electroless nickel plating, hot pressing treatment, and spring processing.

[0039] The method for preparing silicon nitride granulated powder is as follows: silicon nitride powder, ferric nitrate, aluminum sol, polystyrene microspheres, and deionized water are mixed, and the mixing mass ratio is controlled at 90-92:1-3:5-8:9-15:90-120. The mixture is then subjected to high-energy ball milling at a speed of 500-800 r / min for 2-5 hours to obtain a composite powder slurry. Under a vacuum of 0.096-0.1 MPa, the microwave frequency is controlled at 900-2500 MHz (e.g., 915 MHz or 2450 MHz), and the microwave power is 200-1000 W. The composite powder slurry is then microwave-vacuum dried for 10-12 hours to obtain silicon nitride granulated powder.

[0040] In the preparation of the silicon nitride granulated powder, the silicon nitride powder is a mixture of α-phase silicon nitride powder and β-phase silicon nitride powder, with a mass ratio of α-phase silicon nitride powder to β-phase silicon nitride powder of 30-40:60-70. The purity of ferric nitrate is >99.9wt%. The solid content of aluminum sol is >40wt%. The average particle size of polystyrene microspheres is 2-3μm.

[0041] The method for electroless nickel plating is as follows: Silicon nitride granulated powder is placed in a 10-12 wt% hydrochloric acid solution at a volume ratio of 1:2-3 and immersed for 10-20 minutes. After immersion, it is washed with water until the pH reaches 5-7 and dried for 1-2 hours to obtain a pretreated material. Then, the pretreated material is placed in a 20-30 wt% magnesium chloride solution at a volume ratio of 1:1-2 and immersed for 30-40 minutes to form a catalytically active surface. The solid is collected by filtration to obtain an impregnated material. Then, the impregnated material is placed in a nickel plating solution at a volume ratio of 1:1-2 and heated to 85-95°C in a water bath for 2-4 hours for electroless nickel plating. The solid is collected by filtration and then subjected to heat treatment at 200-400°C for 1-2 hours to obtain nickel-plated powder.

[0042] In the electroless nickel plating process, the nickel plating solution uses deionized water as a solvent, nickel sulfate hexahydrate (NiSO4·6H2O) as the main salt solution to provide nickel ions, sodium hypophosphite (NaH2PO2) as a reducing agent to generate Ni-P alloy, and lactic acid is added to prevent nickel ion precipitation, and boric acid is added to maintain the pH of the solution; the nickel sulfate hexahydrate content in the nickel plating solution is 80-90 g / L, the sodium hypophosphite content is 25-30 g / L, the lactic acid content is 10-20 g / L, and the boric acid content is 5-8 g / L.

[0043] The hot-pressing method involves filling nickel-plated powder into a boron nitride mold (the mold cavity is a hollow cylindrical structure, i.e., an annular cylindrical structure) by vibration compaction. Then, under a nitrogen atmosphere, the hot-pressing pressure is controlled at 20-50 MPa, the hot-pressing temperature at 1400-1700℃, and the hot-pressing treatment is carried out for 2-2.5 hours, resulting in a silicon nitride and nickel-phosphorus (Ni-P) alloy composite material block. This composite material block possesses a laminated structure with alternating Ni-P alloy and silicon nitride layers, and its fracture toughness can reach 12.99 MPa·m. 1 / 2 .

[0044] The spring is processed by spiral wire cutting to produce a spiral compression spring (i.e., a high-toughness metal-ceramic composite spring). The spring has a compression rate of 40-45%, a density of >96%, a high-temperature (1000℃) bending strength of 502-514MPa, and a maximum long-term service temperature of 1200℃.

[0045] The method for preparing a high-toughness metal-ceramic composite spring according to this invention involves using iron and aluminum ions to coat the silicon nitride granulated powder during preparation. These ions act as plasticizing agents during the later sintering process, binding the silicon nitride particles and increasing the sintering driving force. Simultaneously, the liquefaction of iron causes volume increase, generating compressive stress on surrounding particles, resulting in plastic motion and thus improving the material's density and high-temperature flexural strength. In the electroless nickel plating and hot-pressing process, the silicon nitride granulated powder is electrolessly nickel-plated followed by hot-pressing. The resulting composite material block possesses a layered biomimetic structure with alternating Ni-P alloy and silicon nitride layers, effectively achieving complementary advantages and improving the material's fracture toughness from 7.5 MPa·m in Comparative Example 1. 1 / 2 Increased to 12.99 MPa·m for composite materials. 1 / 2 This invention combines the temperature resistance of silicon nitride with the fracture elongation characteristics of alloy materials by compositing silicon nitride with nickel alloys. The resulting metal-ceramic composite spring exhibits both excellent temperature resistance and compression performance.

[0046] This invention also provides a high-toughness metal-ceramic composite spring, which is prepared by the above-described method; the compression ratio of the high-toughness metal-ceramic composite spring is 40.9-45.0%.

[0047] The present invention will be further described below with reference to some specific embodiments.

[0048] Example 1

[0049] This embodiment provides a method for preparing a high-toughness metal-ceramic composite spring, specifically as follows:

[0050] (1) Preparation of silicon nitride granulated powder

[0051] Silicon nitride powder, ferric nitrate, aluminum sol, polystyrene microspheres, and deionized water were mixed in a mass ratio of 90:1:5:9:90 and subjected to high-energy ball milling at a speed of 500 r / min for 5 hours to obtain a composite powder slurry. The composite powder slurry was then microwave-vacuum dried for 10 hours in a vacuum environment of 0.096 MPa at a frequency of 915 MHz and a power of 500 W to obtain granulated silicon nitride powder.

[0052] The silicon nitride powder is a mixture of α-phase silicon nitride powder and β-phase silicon nitride powder, with a mass ratio of 35:65. The purity of ferric nitrate is 99.93 wt%. The solid content of aluminum sol is 41 wt%. The average particle size of the polystyrene microspheres is 2.5 μm.

[0053] (2) Electroless nickel plating

[0054] Silicon nitride granulated powder was placed in a 10wt% hydrochloric acid solution at a volume ratio of 1:2 and immersed for 10 min. After immersion, it was washed with water until the pH reached 7 and dried for 2 h to obtain a pretreated material. Then, the pretreated material was placed in a 20wt% magnesium chloride solution at a volume ratio of 1:1.5 and immersed for 30 min to form a catalytically active surface. The solid was collected by filtration to obtain an impregnated material. Then, the impregnated material was placed in a nickel plating solution at a volume ratio of 1:1.5 and heated to 85℃ in a water bath for 4 h for electroless nickel plating. The solid was collected by filtration and then heat-treated at 200℃ for 2 h to obtain nickel-plated powder.

[0055] The nickel plating solution uses deionized water as a solvent, nickel sulfate hexahydrate (NiSO4·6H2O) as the main salt solution to provide nickel ions, sodium hypophosphite (NaH2PO2) as a reducing agent to generate Ni-P alloy, and adds lactic acid to prevent nickel ion precipitation and boric acid to maintain the pH of the solution. The nickel plating solution contains 80 g / L of nickel sulfate hexahydrate, 25 g / L of sodium hypophosphite, 10 g / L of lactic acid, and 5 g / L of boric acid.

[0056] (3) Hot pressing treatment

[0057] Nickel-plated powder was filled into a boron nitride mold (the mold cavity was a hollow cylindrical structure, i.e., an annular cylindrical structure) by vibration compaction. Then, under a nitrogen atmosphere, the hot-pressing pressure was controlled at 30 MPa and the hot-pressing temperature at 1400℃, and the process was carried out for 2 hours to obtain a silicon nitride and nickel-phosphorus (Ni-P) alloy composite material block. The composite material block possesses a laminated structure with alternating Ni-P alloy and silicon nitride layers, and a fracture toughness of 12.91 MPa·m.1 / 2 .

[0058] (4) Spring machining

[0059] Helical compression springs (i.e., high-toughness metal-ceramic composite springs) are produced by processing composite material blocks using a helical wire cutting process.

[0060] This embodiment also provides a high-toughness metal-ceramic composite spring prepared by the above-described method. Testing showed that the high-toughness metal-ceramic composite spring of this embodiment has a compression rate of 40.9%, a density of 96.7%, a high-temperature (1000℃) bending strength of 502 MPa, and a maximum long-term service temperature of 1200℃.

[0061] Example 2

[0062] This embodiment provides a method for preparing a high-toughness metal-ceramic composite spring, specifically as follows:

[0063] (1) Preparation of silicon nitride granulated powder

[0064] Silicon nitride powder, ferric nitrate, aluminum sol, polystyrene microspheres, and deionized water were mixed in a mass ratio of 91:2.3:7.1:12:105 and subjected to high-energy ball milling at a speed of 650 r / min for 4 hours to obtain a composite powder slurry. The composite powder slurry was then microwave-vacuum dried for 11 hours in a vacuum environment of 0.098 MPa at a frequency of 915 MHz and a power of 450 W to obtain granulated silicon nitride powder.

[0065] The silicon nitride powder is a mixture of α-phase silicon nitride powder and β-phase silicon nitride powder, with a mass ratio of 35:65. The purity of ferric nitrate is 99.93 wt%. The solid content of aluminum sol is 41 wt%. The average particle size of the polystyrene microspheres is 2.5 μm.

[0066] (2) Electroless nickel plating

[0067] Silicon nitride granulated powder was placed in an 11wt% hydrochloric acid solution at a volume ratio of 1:2.5 and immersed for 20 min. After washing with water until the pH reached 7, the powder was dried for 2 h to obtain a pretreated material. Then, the pretreated material was placed in a 25wt% magnesium chloride solution at a volume ratio of 1:1.8 and immersed for 35 min to form a catalytically active surface. The solid was collected by filtration to obtain an impregnated material. Then, the impregnated material was placed in a nickel plating solution at a volume ratio of 1:1.8 and heated to 90°C in a water bath for 3 h for electroless nickel plating. The solid was collected by filtration and then heat-treated at 300°C for 1.5 h to obtain nickel-plated powder.

[0068] The nickel plating solution uses deionized water as a solvent, nickel sulfate hexahydrate (NiSO4·6H2O) as the main salt solution to provide nickel ions, sodium hypophosphite (NaH2PO2) as a reducing agent to generate Ni-P alloy, and adds lactic acid to prevent nickel ion precipitation and boric acid to maintain the pH of the solution. The nickel plating solution contains 85 g / L of nickel sulfate hexahydrate, 27 g / L of sodium hypophosphite, 14 g / L of lactic acid, and 7 g / L of boric acid.

[0069] (3) Hot pressing treatment

[0070] Nickel-plated powder was filled into a boron nitride mold (the mold cavity is a hollow cylindrical structure, i.e., an annular cylindrical structure) by vibration compaction. Then, under nitrogen atmosphere protection, the hot pressing pressure was controlled at 40 MPa and the hot pressing temperature at 1550℃, and the hot pressing treatment was carried out for 2.2 hours to obtain a silicon nitride and nickel-phosphorus (Ni-P) alloy composite block. The composite block has a laminated structure with Ni-P alloy and silicon nitride interleaved, and the fracture toughness is 12.99 MPa·m. 1 / 2 .

[0071] (4) Spring machining

[0072] Helical compression springs (i.e., high-toughness metal-ceramic composite springs) are produced by processing composite material blocks using a helical wire cutting process.

[0073] This embodiment also provides a high-toughness metal-ceramic composite spring prepared by the above-described method. Testing showed that the high-toughness metal-ceramic composite spring of this embodiment has a compression rate of 45.0%, a density of 97.3%, a high-temperature (1000℃) bending strength of 514 MPa, and a maximum long-term service temperature of 1200℃.

[0074] Example 3

[0075] This embodiment provides a method for preparing a high-toughness metal-ceramic composite spring, specifically as follows:

[0076] (1) Preparation of silicon nitride granulated powder

[0077] Silicon nitride powder, ferric nitrate, aluminum sol, polystyrene microspheres, and deionized water were mixed in a mass ratio of 92:3:8:15:120 and subjected to high-energy ball milling at a speed of 800 r / min for 3 hours to obtain a composite powder slurry. The composite powder slurry was then microwave-vacuum dried for 12 hours in a vacuum environment of 0.099 MPa at a frequency of 915 MHz and a power of 400 W to obtain granulated silicon nitride powder.

[0078] The silicon nitride powder is a mixture of α-phase silicon nitride powder and β-phase silicon nitride powder, with a mass ratio of 35:65. The purity of ferric nitrate is 99.93 wt%. The solid content of aluminum sol is 41 wt%. The average particle size of the polystyrene microspheres is 2.5 μm.

[0079] (2) Electroless nickel plating

[0080] Silicon nitride granulated powder was placed in a 12wt% hydrochloric acid solution at a volume ratio of 1:3 and immersed for 20 min. After immersion, it was washed with water until the pH reached 7 and dried for 2 h to obtain a pretreated material. Then, the pretreated material was placed in a 30wt% magnesium chloride solution at a volume ratio of 1:2 and immersed for 40 min to form a catalytically active surface. The solid was collected by filtration to obtain an impregnated material. Then, the impregnated material was placed in a nickel plating solution at a volume ratio of 1:2 and heated to 95℃ in a water bath for 2.5 h for electroless nickel plating. The solid was collected by filtration and then heat-treated at 400℃ for 1 h to obtain nickel-plated powder.

[0081] The nickel plating solution uses deionized water as a solvent, nickel sulfate hexahydrate (NiSO4·6H2O) as the main salt solution to provide nickel ions, sodium hypophosphite (NaH2PO2) as a reducing agent to generate Ni-P alloy, and adds lactic acid to prevent nickel ion precipitation and boric acid to maintain the pH of the solution. The nickel plating solution contains 90 g / L of nickel sulfate hexahydrate, 30 g / L of sodium hypophosphite, 20 g / L of lactic acid, and 8 g / L of boric acid.

[0082] (3) Hot pressing treatment

[0083] Nickel-plated powder was filled into a boron nitride mold (the mold cavity was a hollow cylindrical structure, i.e., an annular cylindrical structure) by vibration compaction. Then, under a nitrogen atmosphere, the hot-pressing pressure was controlled at 50 MPa and the hot-pressing temperature at 1700℃, and the process was carried out for 2 hours to obtain a silicon nitride and nickel-phosphorus (Ni-P) alloy composite material block. The composite material block possesses a laminated structure with alternating Ni-P alloy and silicon nitride layers, and a fracture toughness of 12.96 MPa·m. 1 / 2 .

[0084] (4) Spring machining

[0085] Helical compression springs (i.e., high-toughness metal-ceramic composite springs) are produced by processing composite material blocks using a helical wire cutting process.

[0086] This embodiment also provides a high-toughness metal-ceramic composite spring prepared by the above-described method. Testing showed that the high-toughness metal-ceramic composite spring of this embodiment has a compression rate of 43.6%, a density of 97.1%, a high-temperature (1000℃) bending strength of 511 MPa, and a maximum long-term service temperature of 1200℃.

[0087] Comparative Example 1

[0088] For clear comparison, Comparative Example 1 adopts the technical solution of Example 2, the difference being that: chemical nickel plating is omitted, and silicon nitride granulated powder is directly used in hot pressing.

[0089] The fracture toughness of the material block prepared in Comparative Example 1 was tested to be 7.5 MPa·m. 1 / 2 The prepared ceramic spring has a compression rate of 21.0%, a density of 91.5%, a high-temperature (1000℃) bending strength of 230MPa, and a maximum long-term service temperature of 1000℃.

[0090] As can be seen, the preparation method of the high-toughness metal-ceramic composite spring of the present invention, in the process of preparing silicon nitride granulated powder, uses iron ions and aluminum ions to coat the silicon nitride material, which act as plasticizing agents in the later sintering process to bind the silicon nitride particles and improve the sintering driving force. At the same time, the liquefaction of iron will also cause an increase in volume, generating compressive stress on the surrounding particles, causing plastic movement, thereby improving the density and high-temperature flexural strength of the material. In the chemical nickel plating and hot pressing treatment, after the silicon nitride granulated powder is chemically nickel plated, it is hot pressed to obtain a composite material block with a stacked biomimetic structure of Ni-P alloy and silicon nitride interleaved, effectively achieving complementary advantages, which is beneficial to improving the fracture toughness of the material block from 7.5 MPa·m in Comparative Example 1. 1 / 2 Increased to 12.99 MPa·m for composite materials. 1 / 2 This invention combines the temperature resistance of silicon nitride with the fracture elongation characteristics of alloy materials by compositing silicon nitride with nickel alloys. The resulting metal-ceramic composite spring exhibits both excellent temperature resistance and compression performance.

[0091] Unless otherwise stated, all percentages used in this invention are mass percentages.

[0092] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of producing a high-toughness cermet composite spring, characterized by, The method comprises the following steps: The method comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps:

2. The method of claim 1, wherein the high-toughness cermet composite spring is prepared by the steps of: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps:

3. The method of claim 1, wherein the high-toughness cermet composite spring is prepared by the steps of: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps:

4. The method of claim 1, wherein the high-toughness cermet composite spring is prepared by the steps of: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps:

5. The method of claim 1, wherein the high-toughness cermet composite spring is prepared by the steps of: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps:

6. The method of claim 1, wherein the high-toughness cermet composite spring is prepared by the steps of: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps: The method for preparing the silicon nitride granulated powder comprises the following steps:

7. 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steps: The method 8. The method of claim 1, wherein the high-toughness cermet composite spring is prepared by the steps of: The hot-pressing pressure is 20-50 MPa, the hot-pressing temperature is 1400-1700 DEG C, and the hot-pressing time is 2-2.5 h.

9. A high-toughness cermet composite spring produced by the method of any one of claims 1 to 8, characterized in that The compression rate of the high-toughness cermet composite spring is 40.9-45.0%.