CN114231880B

CN114231880B - Tool and method for manufacturing the same

Info

Publication number: CN114231880B
Application number: CN202111551360.7A
Authority: CN
Inventors: 王业友; 瞿义生; 张明
Original assignee: Wuhan Supor Cookware Co Ltd
Current assignee: Wuhan Supor Cookware Co Ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2024-02-02
Anticipated expiration: 2041-12-17
Also published as: CN114231880A

Abstract

The application provides a tool and a method of manufacturing the same. The cutter comprises a cutter body and a composite coating, wherein the composite coating is formed on the surface of the cutter body by adopting composite powder, the composite powder comprises first powder and second powder, the first powder is metal powder, the second powder is hard powder, and the hardness of the hard powder is higher than that of the metal powder. The tool according to the present application is resistant to wear and is permanently sharp.

Description

Tool and method for manufacturing the same

Technical Field

The application relates to the technical field of cutters, in particular to a cutter and a manufacturing method thereof.

Background

The knife is a tool commonly used for cutting vegetables or meat. The existing kitchen cutters are generally made of stainless steel materials, for example, 3Cr13 stainless steel is mainly used, and the kitchen cutters are usually manufactured by heat treatment of the whole material. However, since the hardness of the cutter blade formed by heat treatment is low, the wear resistance is poor.

In the prior art, in order to improve the hardness and wear resistance of a cutter, laser cladding is generally used for forming an alloy coating on the surface of the cutter, but the wear resistance and lasting sharpness of the cutter formed by the method still need to be improved. Therefore, designing a tool that has good wear resistance and can be kept sharp is a problem to be solved.

Disclosure of Invention

It is therefore an object of the present application to provide a tool and a method of manufacturing the same, which solves the problems of the prior art that the wear resistance and the durable sharpness of the tool need to be improved.

According to a first aspect of the present application, there is provided a tool comprising: a cutter body and a composite coating; and the composite coating is formed on the surface of the cutter body by adopting composite powder, wherein the composite powder comprises first powder and second powder, the first powder is metal powder, the second powder is hard powder, and the hardness of the hard powder is higher than that of the metal powder.

In an embodiment, the metal powder includes AT least one of a titanium powder and a stainless steel powder, and the hard powder includes AT least one of a tungsten powder, a titanium oxide powder, an AT-series powder, an aluminum oxide powder, a titanium nitride powder, and a titanium carbide powder.

In an embodiment, the composite coating has a thickness of 10 μm to 50 μm, a porosity of 2% -5%, and a number of pores per 10 square microns on the tool body of 3-10.

In an embodiment, in the composite coating layer, the weight of the metal powder is 90% -97% of the total weight of the composite coating layer, the weight of the hard powder is 3% -10% of the total weight of the composite coating layer, and the sum of the weight percentages of the metal powder and the hard powder is 100%.

According to a second aspect of the present application, there is provided a method of manufacturing a tool, the method comprising: providing a cutter body; providing a composite powder, wherein the composite powder comprises a first powder and a second powder, the first powder is metal powder, the second powder is hard powder, and the hardness of the hard powder is higher than that of the metal powder; and spraying the surface of the cutter body with the composite powder to form a composite coating on the surface of the cutter body.

In an embodiment, the step of providing a composite powder may include mixing a metal powder and a hard powder to form a composite powder.

In other embodiments, the step of providing the composite powder may include providing a metal powder, a hard powder, and a binder, forming the metal powder, the hard powder, and the binder into a slurry, and spray drying the slurry to form the composite powder.

In an embodiment, the preparing the metal powder, the hard powder, and the binder into a slurry may include pretreating the metal powder and the hard powder with the binder to obtain the metal powder with the surface-attached binder and the hard powder with the surface-attached binder, respectively, and forming the metal powder with the surface-attached binder, the hard powder with the surface-attached binder, and the binder into a slurry.

Specifically, the pretreatment of the metal powder and the hard powder through the binder respectively comprises the steps of mixing the metal powder and the hard powder with the binder respectively to form corresponding suspensions, retaining corresponding solids after filtering the corresponding suspensions, and preserving the solids at a preset temperature for a preset time to form the metal powder with the binder attached to the surface and the hard powder with the binder attached to the surface respectively.

In an embodiment, the metal powder comprises AT least one of a titanium powder and a stainless steel powder, the hard powder comprises AT least one of a tungsten powder, a titanium oxide powder, an AT-series powder, an aluminum oxide powder, a titanium nitride powder, and a titanium carbide powder, and the binder comprises an alcoholic binder.

In the examples, the particle size of the metal powder ranges from 20 to 50um, the particle size of the hard powder ranges from 1 to 10um, and the particle size of the composite powder formed by spray drying ranges from 20 to 80um.

In an embodiment, the method of manufacturing a cutter further comprises sintering the composite powder obtained by the spray drying treatment, thereby obtaining the composite powder having a granular form.

Drawings

The foregoing and other objects and features of the application will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a tool according to an embodiment of the present application;

fig. 2 is a partial cross-sectional view of fig. 1 according to an embodiment of the present application.

Detailed Description

The inventive concepts of the present application will be described more fully hereinafter.

The tool has wear resistance by arranging the composite coating containing the hard powder on the surface of the tool. Tungsten powder, titanium oxide powder, AT-series powder, aluminum oxide powder, titanium nitride powder, and titanium carbide powder as materials capable of enhancing hardness, and since they have good properties (high hardness, low price, etc.) and can satisfy the requirements of food safety, it is possible to realize a tool having wear resistance by providing a coating layer having a hard powder on the surface of the tool.

However, since these powders are difficult to melt, it is difficult to form a coating layer on the surface of the tool alone, and therefore, in order to impart a certain wear resistance to the tool, it is necessary not only to select a suitable hard material but also to consider how to form it better on the tool.

The inventor researches and discovers that a composite coating with certain hardness can be formed on the surface of a cutter by spraying the composite powder formed by metal powder and hard powder, so that the cutter with better wear resistance can be obtained.

As shown in fig. 1 and 2, embodiments of the present application provide a tool that includes a tool body 10 and a composite coating 20, the tool being at least capable of being used to cut food materials, the composite powder being sprayed onto the surface of the tool body 10 to form the composite coating 20. The composite powder includes a first powder and a second powder, the first powder is a metal powder, the second powder is a hard powder, and the hardness of the hard powder is higher than that of the metal powder, so that the composite coating 20 can be a mixed layer formed by the metal powder and the hard powder.

In the tool according to the embodiment of the present application, the composite coating layer 20 contains the hard powder, so that the tool has a certain hardness, and the composite coating layer 20 also contains the metal powder having a hardness lower than that of the hard powder, so that the tool has a certain toughness. Therefore, the cutter has better wear resistance and can be sharp for a long time.

The metal powder is present in the form of particles as one component of the composite powder, and may include at least one of titanium and stainless steel. In the composite coating 20, the weight of the metal powder is 90% -97% of the total weight of the composite coating, the weight of the hard powder is 3% -10% of the total weight of the composite coating, and the sum of the weight percentages of the metal powder and the hard powder is 100%. When the metal powder is sufficiently melted, while the metal powder is in a molten state, the hard powder is not melted due to the high melting point, and the hard powder can be bonded to the tool body 10 by means of the melt of the metal powder. In addition, titanium and stainless steel have a certain corrosion resistance, so that the obtained tool is not easy to rust.

The hard powder plays a role in increasing the hardness of the tool in the finally formed composite coating layer 20, and exists in the form of particles, and may include AT least one of tungsten powder, titanium oxide powder, AT-series powder (composite powder formed of aluminum oxide and titanium oxide, such as but not limited to AT 13), aluminum oxide powder, titanium nitride powder, and titanium carbide powder.

In an embodiment, the thickness of the composite coating can be 10-50 μm, and the thickness of the composite coating is smaller than 10 μm, so that the abrasion resistance is improved and the lasting sharpness is not obvious; if the thickness of the composite coating is more than 50 mu m, the spraying time is too long, and the yield in the manufacturing process is reduced. In addition, the difficulty of sharpening a knife can be increased if the thickness of the composite coating is too thick. The porosity of the composite coating 20 may be 2% -5%, and a suitable porosity may further improve the toughness of the composite coating, and may alleviate the increase in brittleness of the composite coating caused by the addition of the hard powder, and reduce the risk of coating collapse.

Hereinafter, a method of manufacturing the tool of the present application will be described in detail with reference to examples.

The embodiment of the application also provides a manufacturing method of the cutter, which comprises the following steps:

in step S101, a cutter body 10 is provided, the cutter being at least for cutting food material. Illustratively, the cutter may be at least one of a slicing cutter, a scissors and a multi-purpose cutter, and the cutter body 10 may be made of stainless steel or titanium, and may be specifically made of 3Cr13 stainless steel.

Step S102, providing composite powder, wherein the composite powder comprises first powder and second powder, the first powder is metal powder, the second powder is hard powder, and the hardness of the hard powder is higher than that of the metal powder.

Step S103, spraying the surface of the tool body 10 with the composite powder to form the composite coating layer 20 on the surface of the tool body 10.

In an embodiment, the composite coating 20 may be provided on a portion of the surface of the cutter body 10 that contacts the food material, for example, at the edge of the blade, and may have a width of 1-15mm. But may of course also be provided on the entire surface of the tool body 10. The composite coating 20 may be applied on one side or both sides during the manufacturing process as desired, and the scope and location of the formation of the composite coating 20 is not limited in this application.

In embodiments, the step of providing the tool body 10 may include treating the surface of the tool body 10, where the treatment includes chemical and/or mechanical treatments to facilitate the formation of the composite coating 20 in a subsequent process.

The present application may mix metal powder and hard powder to form a composite powder. However, in order to make the mixing of the two powders more uniform and to improve the utilization of the raw materials, the composite powder may be formed by, for example, granulation or the like. The method of producing the composite powder of the present application will be described below by taking a method of producing the composite powder in a granulation manner as an example.

According to further embodiments of the present application, the step of providing a composite powder may include providing a metal powder and a hard powder, providing a binder, forming the metal powder, the hard powder, and the binder into a slurry, and subjecting the slurry to a spray drying process to form the composite powder.

In an embodiment, providing the metal powder and the hard powder may include preparing the metal powder and the hard powder, respectively, and the metal powder may include at least one of a titanium powder and a stainless steel powder. The metal powder can be in a spherical or spheroidic structure with uniform size, and the metal powder can be in a strip shape, a diamond shape or the like, so that the metal powder can be uniformly melted in the subsequent spraying process. The hard powder may include AT least one of tungsten powder, titanium oxide powder, AT-series powder, aluminum oxide powder, titanium nitride powder, and titanium carbide powder. Providing the binder may include providing an alcohol-based binder, and in particular, may include at least one of a polyvinyl alcohol-based binder, a polypropylene alcohol-based binder, and other higher alcohol-based binders having six or more carbon atoms.

In order to facilitate the subsequent spraying process, metal powder and/or hard powder with smaller particle size difference can be selected, for example, raw materials can be respectively ball-milled to obtain metal powder and hard powder, and then the metal powder and the hard powder with proper particle size are screened for later use.

In an embodiment, the particle size of the metal powder is 20 to 50 μm and the particle size of the hard powder is 1 to 10 μm. Here, the particle size of the above-mentioned material may be the maximum length of each material particle, and the material is not particularly limited to have a spherical or spheroid shape. For example, but not limited to, when a material has an oval shape, the particle size dimension of the material may refer to the length of its major axis. In an embodiment, the particle size of the composite powder obtained after the spray drying treatment may be 20 to 80um.

According to the method of making a tool of the present application, forming the metal powder, the hard powder, and the binder into a slurry may include first preparing the binder into a slurry. Then, the prepared metal powder and hard powder are added to the above slurry, thereby obtaining a slurry required for subsequent spray drying. Here, the weight ratio of the metal powder and the hard powder may be determined according to the desired ratio of the respective components in the composite coating layer. Illustratively, the metal powder and the hard powder of the present application may have a weight ratio of 9:1 to 97:3. the two kinds of powder may be added to the slurry to form a slurry, or may be mixed and then added to the slurry to form a slurry. However, the order and manner of feeding the two powders is not limited by the present application.

The step of preparing a binder into a slurry according to the present application includes dissolving the binder, dispersant, and defoamer into deionized water to prepare a slurry. Wherein the binder can comprise an alcohol binder, the defoamer can be polyether modified silicone oil or organic silicone oil, and the dispersant can be citric acid or triethylhexyl phosphoric acid. According to the application, the dispersing agent and the defoaming agent are selected as the auxiliary agents, so that the two kinds of powder can be uniformly dispersed in the slurry, and of course, other suitable auxiliary agents can be selected according to actual needs, and the application is not limited to the above.

As an example, the slurry may include, in weight percent, 1% -4% binder, 0.5% -1% dispersant, 1% -2% defoamer, and balance deionized water. The weight ratio of dispersant and defoamer in the slurry is proportional to the weight ratio of binder, respectively, that is, the higher the binder content, the higher the dispersant to defoamer ratio.

In an embodiment, the prepared metal powder and hard powder may be added to the above prepared slurry in an amount of 20% -70% by weight of the total weight of the metal powder and hard powder based on the total weight of the slurry. When the total weight ratio of the metal powder and the hard powder is less than 20%, the weight ratio of the solid in the slurry is small, and the weight ratio of the liquid is relatively large, so that the granulating time is long, and the cost is too high; when the total weight ratio of the metal powder and the hard powder is more than 70%, the weight ratio of the solid in the slurry is large, and the weight ratio of the liquid is relatively small, so that the subsequent spraying process cannot be stably performed, and the production stability is affected.

According to the method for preparing composite powder, after pulping is finished, the slurry is subjected to spray drying. According to some embodiments of the present application, the slurry may be delivered to a high-speed liquid-slinging disc to form droplets, which are then blown into a drying tower with hot air, the droplets undergoing a short dwell during descent, ultimately forming a composite powder with particles of hard powder bonded in metal powder by a binder.

According to the method of producing a composite powder of the present application, since both the particle diameters of the metal powder and the hard powder are small, the particle diameters of the particles of the composite powder formed by the adhesion of the metal powder and the hard powder via the binder are also relatively small, and thus a relatively low rotational speed is required. The particle size of the hard powder is smaller than that of the metal powder, so that the hard powder can be reliably and uniformly formed in the metal powder to form granular granulated powder by controlling the rotating speed of the liquid throwing disc in the process of high-speed movement on the liquid throwing disc. According to some embodiments of the present application, the rotational speed of the high-speed slinger disc may be controlled in the range of 6000 rpm to 10000 rpm, preferably 7000 rpm to 8000 rpm. The relatively low temperature hot air can reduce the loss of the binder, so that enough binder is reserved in the particles of the obtained composite powder, and corresponding pores can be formed synchronously in the process of binder loss. According to some embodiments of the present application, the temperature of the hot air may be controlled in the range of 60 ℃ to 100 ℃, the temperature of the drying tower may be controlled in the range of 100 ℃ to 400 ℃, and the short residence time of the droplets within the drying tower may be controlled in the range of 5 seconds to 15 seconds.

According to the method for producing a composite powder of the present application, the composite powder obtained after spray-drying is sintered.

After the spray drying is completed, the obtained composite powder also contains a certain amount of moisture, so that the composite powder needs to be sintered, and the moisture in the composite powder can be removed. According to some embodiments of the present application, the sintering curve (i.e., specific parameters in the sintering step) may be formulated according to physical properties of the raw material, which is not particularly limited herein, and one skilled in the art may formulate the sintering curve according to the characteristics of the raw material powder under the teachings of the present application. As an example, the initial temperature of sintering may be 20 ℃ to 30 ℃, the temperature rising rate may be 5 ℃ to 10 ℃/min, the temperature rising to 200 ℃, and then the temperature is kept for 3 hours to 10 hours.

According to the method, due to the fact that the particle size of the composite powder is small, the required effect can be achieved through the slow heating speed and the short heat preservation time, and energy sources can be saved. In addition, corresponding pores can be formed in the particles of the composite powder in the drying process, and the finally formed composite powder has proper porosity, so that the formation of the pores in the composite coating can be facilitated, the toughness of the cutter is better, and the service life of the cutter is further prolonged. The voids may be created during spraying of the composite powder, such as, but not limited to, consumption of binder due to high temperatures during spraying with the composite powder to form the composite coating, thereby enabling the creation of corresponding voids.

In the composite powder obtained by the granulation method according to the application, the weight of the metal powder is 88% -97% of the total weight of the composite powder, the weight of the hard powder is 1% -10% of the total weight of the composite powder, the weight of the binder is 1% -4% of the total weight of the composite powder, and the sum of the weight percentages of the metal powder, the hard powder and the binder is 100%. The composite coating can be formed on the surface of the tool body by spraying, and the porosity of the composite coating is 2-5%.

According to the resultant composite powder in the form of particles, the composite powder is thermally sprayed onto the surface of the tool body 10 to form the composite coating 20 on the surface thereof. In the composite coating, the larger the porosity is, the stronger the impact resistance of the composite coating is, but if the single pore is too large, the lower the strength of the composite coating is, the problem that the coating is easy to collapse is solved, so that the proper porosity and pore size can ensure the strength of the coating and the toughness of the coating. Although porosity can be controlled by thermal spraying processes, the individual pores formed by thermal spraying are too large, and it is desirable to have a relatively small individual pore size to provide a coating that has both strength and toughness. Therefore, by increasing the binder ratio in the composite powder, the binder volatilizes after the thermal spraying process, and the pores formed by the binder volatilization are smaller and uniform in size because the binder is uniformly adhered to the powder surface.

The inventor researches and discovers that the metal powder and the hard powder can be pretreated to ensure that a certain amount of binder can be reserved on the surface of the metal powder and the hard powder, so that the aim of forming the composite powder with higher content of binder is fulfilled. The preparation method of the composite powder of the present application will be briefly described below taking as an example the pretreatment of two powders followed by spray-drying treatment to form a composite powder.

In an embodiment, slurrying the metal powder, the hard powder, and the binder includes pre-treating the metal powder and the hard powder with the binder, respectively, to obtain a surface-adherent metal powder and a surface-adherent hard powder, and slurrying the surface-adherent metal powder, the surface-adherent hard powder, and the binder.

In an embodiment, the pre-treating the metal powder and the hard powder with the binder, respectively, may include mixing the metal powder and the hard powder with the binder, respectively, to form corresponding suspensions, filtering the corresponding suspensions to remove the liquid while retaining the corresponding solids, and incubating the solids at a preset temperature for a preset time to form the metal powder with the surface-attached binder and the hard powder with the surface-attached binder, respectively. Here, the time of heat preservation and the time of stirring are both related to the particle size corresponding to the powder, and the smaller the particle size is, the longer the time of heat preservation and the time of stirring are, so that a structure in which the adhesive adheres to the powder surface is formed. According to the present application, the binder can be made to adhere to the powder surface like a viscous state by the pretreatment, and is not easily soluble in the step of the subsequent spray-drying treatment, further increasing the ratio of the binder that can be finally formed in the composite powder. Also, in consideration of the viscosity of the binder, the binder may be diluted with deionized water first so that the powder can be uniformly mixed in the slurry.

According to an exemplary embodiment of the present application, the metal powder, the binder, and the deionized water may be mixed according to 0.5 to 1.5:0.2-0.7:8.0 to 9.0, preferably, metal powder, a binder and deionized water can be prepared according to the mass ratio of 1:0.5:8.5 weight ratio. And stirring the suspension for 10-30 min, and then filtering to remove the liquid and keep the solid. Then, the solid is kept at 150-200 ℃ for 3-8 hours to completely remove the water, and the metal powder with the adhesive attached to the surface is obtained. The method for producing the hard powder having the surface-mounted binder according to the present application can be obtained by referring to the above method. The hard powder according to the present application has a small particle size relative to the metal powder, and thus requires a long stirring time and a long holding time, and may be exemplified by 30 to 60 minutes and 3 to 10 hours.

According to the method of preparing a composite powder of the present application, after preparing a slurry, the slurry is spray-dried to form a composite powder, and after spray-drying, the obtained composite powder may be further sintered to obtain a composite powder in the form of particles. In the composite powder obtained by the combination of pretreatment and granulation, the weight of the metal powder is 88% -97% of the total weight of the composite powder, the weight of the hard powder is 1% -10% of the total weight of the composite powder, the weight of the binder is 2% -4% of the total weight of the composite powder, and the sum of the weight percentages of the metal powder, the hard powder and the binder is 100%. The composite coating can be formed on the surface of the tool body by spraying, and the porosity of the composite coating is 3.5% -5%.

According to the method for preparing the cutter, the powder obtained by sintering can be screened after the sintering step, so that the composite powder with different particle size ranges can be obtained. Can be screened into composite powder with different particle size ranges according to the requirement so as to be applied to different products.

According to the method of manufacturing a cutter according to the present application, the particles of the finally formed composite powder do not refer to one particle in the quantitative sense, but may be a plurality of particles aggregated together. The particle size of the finally formed composite powder particles is not smaller than the original various powder particle sizes.

According to the composite powder obtained in the form of particles, the composite powder is sprayed on the surface of the tool body 10 to form a composite coating on the surface thereof to obtain the intended tool.

Specifically, thermal spraying may be used for spraying, where parameters of thermal spraying are: current flow: 250-600A; voltage: 30-120V; main gas (argon) flow: 1000-5000L/h; hydrogen flow rate: 20-300L/h; powder feeding air pressure: 200-800L/h; powder feeding amount: 20-200 g/min; spray (distance of gun nozzle from workpiece) distance: 8-40 cm; spray angle: 30-80 degrees; workpiece temperature: 10-150 ℃.

The following describes the technical solution of the present application in detail with reference to examples, but the scope of protection of the present application is not limited to the examples.

Example 1

The tool according to example 1 was prepared by the following method.

Step S10, the surface of the cutter body is pretreated, the material is specifically 3Cr13, specifically, an alkaline solvent and clear water are adopted to clean the surface of the cutter body in sequence, and then the cutter body is dried.

Step S20: stainless steel powder with surface attached with polyacrylate is prepared. Stainless steel powder having an average particle diameter of 30 μm was prepared as the metal powder, and polypropylene alcohol was selected as the binder. According to stainless steel powder: and (3) polyacrylate: the mass ratio of deionized water is 1:0.5:8.5 preparing a suspension, stirring for 20min, and then filtering to remove the liquid and retain the solid therein. Then, the solid was incubated at 200℃for 4 hours, and the moisture was removed to obtain a stainless steel powder with a surface to which a polypropylene alcohol was attached.

Step S30: alumina powder with a surface attached to a polypropylene alcohol was prepared. Alumina powder having an average particle diameter of 5 μm was prepared as a hard powder, and polyacrylate was selected as a binder. According to the alumina powder: and (3) polyacrylate: the mass ratio of deionized water is 1:0.5:8.5 preparing a suspension, stirring for 50min, and then filtering and retaining solids therein. Then, the solid was incubated at 200℃for 7 hours, and the moisture was removed to obtain an alumina powder with a surface adhered with a polyallylamine.

Step S40: the slurry required for spray drying was prepared.

Preparing slurry: the slurry can comprise 3% of the polyacrylate, 0.8% of the triethylhexyl phosphoric acid, 1.5% of the organic silicone oil and the balance of deionized water according to the weight percentage, and the slurry is formed by mixing the components.

Preparing slurry: stainless steel powder with surface attached to the polypropylene alcohol and alumina powder with surface attached to the polypropylene alcohol were mixed according to 24:1, and adding the prepared two kinds of powder to the prepared slurry so as to prepare the slurry, wherein the total weight of the stainless steel powder with the surface attached with the polypropylene alcohol and the alumina powder with the surface attached with the polypropylene alcohol accounts for 45% of the total weight of the slurry.

Step S50: the slurry was spray dried.

And (3) conveying the slurry to a high-speed liquid throwing disc with the speed of 7500 r/min, throwing the slurry out of the liquid throwing disc to form liquid drops, blowing the liquid drops into a drying tower with the temperature of 300 ℃ by hot air with the temperature of 80 ℃, and falling down after short stay in the falling process to obtain composite powder containing certain moisture.

Step S60: sintering the formed composite powder to remove the moisture contained in the composite powder, wherein the sintering parameters are as follows: the initial temperature of sintering may be 25 ℃, the temperature rising speed may be 8 ℃ per minute, the temperature is raised to 200 ℃, and then the temperature is kept for 7 hours, thereby obtaining the composite powder in the form of particles. In the particles of the composite powder, the weight of the stainless steel powder was 92.5% of the total weight of the particles, the weight of the polyacrylate was 3.5% of the total weight of the particles, and the weight of the alumina powder was 4% of the total weight of the particles, based on the total weight of the particles, as analyzed by XRD diffraction.

Step S70, carrying out thermal spraying on the surface of the cutter by adopting composite powder, wherein the spraying parameters are as follows: current flow: 350A; voltage: 80V; main gas (argon) flow: 2500L/h; hydrogen flow rate: 85L/h; powder feeding air pressure: 500L/h; powder feeding amount: 50g/min; spray (distance of gun nozzle from workpiece) distance: 30cm; spray angle: 50 °; workpiece temperature: the tool of example 1 was obtained at 90 ℃. The resulting composite coating layer on the surface of the tool had a thickness of 20 μm and a porosity of 3.8%, and in the final composite coating layer, the weight of the stainless steel powder was 96.4% of the total weight of the composite coating layer, and the weight of the alumina powder was 3.6% of the total weight of the composite coating layer, based on the total weight of the composite coating layer.

Example 2

The tool according to example 2 was prepared by the following method.

Step S10, preprocessing the surface of the cutter body, specifically, cleaning the surface of the cutter body by adopting an alkaline solvent and clear water in sequence, and then drying;

step S20, preparing composite powder.

Stainless steel powder having an average particle diameter of 30 μm was prepared as a metal powder, alumina powder having an average particle diameter of 5 μm was prepared as a hard powder, and the stainless steel powder was prepared by: the alumina powder was mixed at a weight ratio of 24:1 to form a composite powder.

Step S30, performing thermal spraying on the surface of the cutter by adopting composite powder to form a composite coating, wherein the spraying parameters are as follows: current flow: 350A; voltage: 80V; main gas (argon) flow: 2500L/h; hydrogen flow rate: 85L/h; powder feeding air pressure: 500L/h; powder feeding amount: 50g/min; spray (distance of gun nozzle from workpiece) distance: 30cm; spray angle: 50 °; workpiece temperature: the tool of example 2 was obtained at 90 ℃. The resulting composite coating layer on the surface of the tool had a thickness of 20 μm and a porosity of 2.5%, and in the composite coating layer, the weight of the stainless steel powder was 96.3% based on the total weight of the composite coating layer, and the weight of the alumina powder was 3.7% based on the total weight of the composite coating layer.

Example 3

A tool according to example 3 was manufactured in the same manner as in example 1, except that titanium powder was used instead of stainless steel powder in the composite powder. The resulting composite coating layer on the surface of the tool had a thickness of 20 μm and a porosity of 3.7%, and in the composite coating layer, the weight of titanium powder was 96.2% based on the total weight of the composite coating layer, and the weight of alumina powder was 3.8% based on the total weight of the composite coating layer.

Example 4

A tool according to example 4 was manufactured in the same manner as in example 1, except that titanium carbide powder was used instead of alumina in the composite powder. The resulting composite coating layer on the surface of the tool had a thickness of 20 μm and a porosity of 3.7%, and in the composite coating layer, the weight of the stainless steel powder was 96.3% based on the total weight of the composite coating layer, and the weight of the titanium carbide powder was 3.7% based on the total weight of the composite coating layer.

Example 5

A cutter according to example 5 was manufactured in the same manner as in example 1, except that the stainless steel powder and the alumina powder were not pretreated, and only the stainless steel powder and the alumina powder were mixed in the slurry to form the slurry (i.e., steps S20 to S30 were not included). The resulting composite coating layer on the surface of the tool had a thickness of 20 μm and a porosity of 2.8%, and in the composite coating layer, the weight of the stainless steel powder was 96.1% based on the total weight of the composite coating layer, and the weight of the alumina powder was 3.9% based on the total weight of the composite coating layer.

Comparative example 1

A tool according to comparative example 1 was manufactured in the same manner as in example 1, except that titanium powder was used instead of alumina in the composite powder (the hardness of the titanium powder is less than that of the 3Cr13 stainless steel). The resulting composite coating layer on the surface of the tool had a thickness of 20 μm and a porosity of 3.7%, and in the composite coating layer, the weight of the stainless steel powder was 96.2% based on the total weight of the composite coating layer, and the weight of the titanium powder was 3.8% based on the total weight of the composite coating layer.

Comparative example 2

Commercial cutters.

The compositions according to examples 1 to 5 and comparative examples 1 to 2 of the present application are shown in the following table 1:

table 1 parameters of examples and comparative examples of the present application

Performance index test

The test results of examples 1-5 and comparative examples 1-2 are shown in Table 2, and the specific performance test methods are as follows:

(1) Hardness: the Vickers hardness test method in 6.2.9.2.2 of GB/T40356-2021 is used for testing hardness, the hardness and sharpness are in corresponding relation, and the higher the hardness is, the higher the sharpness is.

(2) Sharpness degree: the sharpness test method in annex C in GB/T40356-2021 tests the sharpness of the cutter; the greater the sharpness value, the sharper the tool.

(3) Durability degree: the durability test method in annex C in GB/T40356-2021 tests the durability of the cutter, and the larger the durability value, the more durable the cutter.

Table 2: test results schematic table of examples and comparative examples of the present application

Sequence number	Hardness (Hv)	Sharpness (mm)	Durability (mm)
				Example 1	735	55	235
Example 2	736	56	211
				Example 3	689	51	231
Example 4	741	56	234
				Example 5	735	55	219
Comparative example 1	510	26	232
				Comparative example 2	515	30	150

From the above, it can be seen from table 2 that: the cutters of examples 1 to 5 have better hardness and sharpness and are durable sharp, and in addition, the cutters of the present application have the characteristic of corrosion resistance.

Although embodiments of the present application have been described in detail hereinabove, various modifications and variations may be made to the embodiments of the present application by those skilled in the art without departing from the spirit and scope of the present application. It will be appreciated that such modifications and variations will still fall within the spirit and scope of the embodiments of the present application as defined by the appended claims, as will occur to those skilled in the art.

Claims

1. A method of manufacturing a cutter, the cutter being a kitchen cutter, the method comprising:

providing a cutter body;

providing a composite powder comprising a first powder and a second powder, the first powder being a metal powder and the second powder being a hard powder, the hard powder having a hardness higher than the hardness of the metal powder, wherein the step of providing the composite powder comprises: the method comprises the steps of respectively pre-treating metal powder and hard powder through an alcohol binder to obtain metal powder with the surface attached with the alcohol binder and hard powder with the surface attached with the alcohol binder, forming slurry from the metal powder with the surface attached with the alcohol binder, the hard powder with the surface attached with the alcohol binder and the binder, and performing spray drying treatment on the slurry to form the composite powder;

and carrying out thermal spraying on the surface of the cutter body by adopting the composite powder, so that the alcohol binder in the composite powder volatilizes to form a composite coating with 3.5-5% of porosity and 3-10 pores per 10 square micrometers on the surface of the cutter body.

2. The method of manufacturing a tool according to claim 1, wherein the pre-treating the metal powder and the hard powder with a binder, respectively, comprises:

and mixing the metal powder and the hard powder with the alcohol binder respectively to form corresponding suspension, filtering the corresponding suspension, retaining corresponding solid, and preserving the solid at a preset temperature for a preset time to form the metal powder with the alcohol binder attached to the surface and the hard powder with the alcohol binder attached to the surface respectively.

3. The method of manufacturing a tool according to claim 1, wherein the metal powder comprises at least one of titanium powder and stainless steel powder.

4. The method of manufacturing a tool according to claim 1, wherein the hard powder includes AT least one of tungsten powder, titanium oxide powder, AT-series powder, aluminum oxide powder, titanium nitride powder, and titanium carbide powder.

5. The method of manufacturing a tool according to claim 1, wherein the metal powder has a particle size ranging from 20 μm to 50 μm and the hard powder has a particle size ranging from 1 μm to 10 μm.

6. The method of manufacturing a cutter according to claim 1, wherein the particle size of the composite powder formed by spray drying is in the range of 20 μm to 80 μm.

7. The method of manufacturing a cutter according to claim 1, further comprising sintering the composite powder obtained by the spray drying treatment, thereby obtaining the composite powder having a granular form.

8. A tool manufactured by the method for manufacturing a tool according to any one of claims 1 to 7.

9. The tool according to claim 8, wherein,

the thickness of the composite coating is 10-50 mu m.

10. The tool according to claim 8, wherein in the composite coating layer, the weight of the metal powder is 90% -97% of the total weight of the composite coating layer, the weight of the hard powder is 3% -10% of the total weight of the composite coating layer, and the sum of the weight percentages of the metal powder and the hard powder is 100%.