A kitchen knife laser cladding preparation method based on powder high-entropy alloy steel and a kitchen knife obtained by the method

Abstract

The application belongs to the technical field of kitchen knives, and particularly relates to a kitchen knife laser cladding preparation method based on powder high-entropy alloy steel and a kitchen knife obtained by the method. The preparation method comprises the following steps: 1) obtaining a powder high-entropy alloy steel material, the composition and content of which are specifically as follows: Ni: 24.5-26.5 wt.%, Cr: 17.5-18.5 wt.%, Ti: 8.5-9.5 wt.%, Cu: 6.5-7.5 wt.%, Ag: 8.5-9.5 wt.%, Al: 6-7.5 wt.%, B: 0.75-1.05 wt.%, Nb: 0.90-1.05 wt.%, La: 1.10-1.15 wt.%, and the rest is Fe and inevitable impurities; 2) mixing the powder high-entropy alloy steel material and propyl alcohol, coating the mixture on the surface of a knife base after uniform mixing, and then performing laser cladding after drying; and 3) laser cladding to obtain a kitchen knife based on powder high-entropy alloy steel. The kitchen knife provided by the application has high hardness and high wear resistance, and also has certain antibacterial performance, and is particularly suitable for being used as a material of a kitchen knife.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of kitchen knives, and particularly relates to a kitchen knife laser cladding preparation method based on powder high-entropy alloy steel and a kitchen knife obtained through the method. BACKGROUND

[0002] Kitchen knives are usually made of stainless steel, which is easy to wear and breed bacteria after long-term use due to the limitation of the material itself. In order to improve the hardness and wear resistance of the knife and prolong the service life of the knife, a technology of spraying an alloy coating on the knife by laser cladding is developed. However, the performance of the alloy coating determines the hardness and wear resistance of the whole knife.

[0003] Ye Wuyi prepared a cast CuCoNiCrAlFe alloy by using an electric arc smelting technology, found that the alloy only has a simple solid solution structure, and named this new alloy as a high-entropy alloy. The high-entropy alloy is composed of five or more than five metal elements with equal atomic ratio or near equal atomic ratio, and each element accounts for about 5% to 35%. Due to the high-entropy effect in thermodynamics, the slow diffusion effect in kinetics, the lattice distortion effect in structure and the "cocktail" effect in performance, the high-entropy alloy has excellent properties such as high strength, high hardness, good ductility, wear resistance and corrosion resistance.

[0004] Due to the excellent performance of the high-entropy alloy, its application fields are very wide, such as being used for manufacturing hard tool materials, high-temperature resistant materials and precision castings. Therefore, the combination of the high-entropy alloy technology into the field of kitchen knives is expected to improve the comprehensive performance of the kitchen knives. SUMMARY

[0005] In order to solve the problems of the prior art, the application provides a kitchen knife laser cladding preparation method based on powder high-entropy alloy steel and a kitchen knife obtained through the method. The kitchen knife provided by the application has high hardness, high wear resistance and certain antibacterial properties, and is particularly suitable for being used as a kitchen knife material.

[0006] The technical scheme provided by the application is as follows:

[0007] A kitchen knife laser cladding preparation method based on powder high-entropy alloy steel, comprising the following steps:

[0008] 1) obtain a powder high-entropy alloy steel material, the components and contents of which are specifically as follows: Ni: 24.5-26.5 wt.%, Cr: 17.5-18.5 wt.%, Ti: 8.5-9.5 wt.%, Cu: 6.5-7.5 wt.%, Ag: 8.5-9.5 wt.%, Al: 6-7.5 wt.%, B: 0.75-1.05 wt.%, Nb: 0.90-1.05 wt.%, La: 1.10-1.15 wt.%, and the balance being Fe and inevitable impurities;

[0009] 2) mix the powder high-entropy alloy steel material and propanol, coat the mixture on the surface of a cutter substrate after uniform mixing, and dry the mixture before laser cladding;

[0010] 3) laser cladding to obtain a kitchen cutter based on the powder high-entropy alloy steel.

[0011] Based on the above technical solution, a kitchen cutter with high hardness and high wear resistance and certain antibacterial performance can be obtained.

[0012] Ni: Nickel is a ferrophilic element and is easy to combine with iron in the alloy system to improve the hardness of the alloy. Nickel is insoluble in water and forms a dense oxide film on the surface at room temperature in humid air, which can prevent the bulk metal from continuing to oxidize and improve the wear resistance of the alloy surface.

[0013] Cr: Chromium is a strong carbide-forming element that can form a large amount of Cr 23 C6 and other carbides, effectively improving the wear resistance of the alloy. A higher chromium content can enhance the hardenability of the alloy, making the alloy less prone to cracking in extreme working conditions such as rapid cooling and heating, thereby prolonging the service life.

[0014] Ti: Titanium is easy to form an interstitial solid solution structure with the alloy, which can improve the overall mechanical properties of the alloy to a certain extent under the action of solid solution strengthening. In addition, titanium has the effect of refining the grain structure of the alloy, forming a fine and dense structure that positively affects the strength and toughness of the alloy. During wear, titanium is easy to oxidize to form an oxide film, which plays a lubricating and protective role during friction, thereby reducing the wear rate of the alloy.

[0015] Cu and Ag: can effectively improve the antibacterial performance of the alloy.

[0016] The cutter substrate material can be stainless steel 3Cr13 as the base material.

[0017] Specifically, in step 1):

[0018] The purity of each component in the powder high-entropy alloy steel material is greater than or equal to 99%;

[0019] The particle size of the powder high-entropy alloy steel material is 250-400 mesh.

[0020] Specifically, in step 2), the mass percentage of the powder high-entropy alloy steel material and propanol is (90-95%):(5-10%).

[0021] Specifically, in step 2), the coating thickness is 1-2 mm.

[0022] Specifically, in step 2), during the coating process, ethanol is uniformly added dropwise, and the mass ratio of ethanol to propanol is 1:(5-10).

[0023] Specifically, in step 3), the laser power is 1600-1800 KW, the spot diameter is 0.6-0.8 mm, the scanning speed is 120-150 mm / min, the defocusing amount is 0, the protective gas is argon, nitrogen or helium, and the gas flow is 30-40 L / min.

[0024] Specifically, in step 3), argon is used as the protective gas, and the gas flow is 35-40 L / min.

[0025] The application also provides a kitchen knife prepared by the above preparation method.

[0026] Specifically, the use environment humidity is 20-95%, including an environment prone to bacterial growth.

[0027] The application also provides the use of the above kitchen knife for making kitchen knives. DETAILED DESCRIPTION

[0028] The principles and characteristics of the application are described below, and the examples are only used to explain the application and not to limit the scope of the application.

[0029] Example 1

[0030] The preparation method of the kitchen knife based on powder high-entropy alloy steel specifically includes the following steps:

[0031] 1) Obtain a powder high-entropy alloy steel material, and the components and contents are specifically as follows: Ni: 25.5 wt.%, Cr: 17.5 wt.%, Ti: 9.5 wt.%, Cu: 7 wt.%, Ag: 9 wt.%, Al: 6.5 wt.%, B: 1.05 wt.%, Nb: 1.05 wt.%, La: 1.15 wt.%, and the rest is Fe and unavoidable impurities.

[0032] 2) mixing the powder high-entropy alloy steel material and propanol, coating on the surface of the cutter substrate after uniform mixing, and then performing laser cladding after drying, the mass percentage of the powder high-entropy alloy steel material and propanol being 95%:5%, and the coating thickness being 2mm;

[0033] 3) laser cladding, to obtain the kitchen cutter based on the powder high-entropy alloy steel, the laser power being 1800KW, the spot diameter being 0.7mm, the scanning speed being 120mm / min, the defocusing amount being 0, argon being used as the protective gas, and the gas flow being 40L / min.

[0034] Example 2

[0035] The preparation method of the kitchen cutter based on the powder high-entropy alloy steel specifically comprises the following steps:

[0036] 1) obtaining a powder high-entropy alloy steel material, the composition and content of which are specifically as follows: Ni: 25.5wt.%, Cr: 17.5wt.%, Ti: 9.5wt.%, Cu: 7wt.%, Ag: 9wt.%, Al: 6.5wt.%, B: 1.05wt.%, Nb: 1.05wt.%, La: 1.15wt.%, and the rest being Fe and inevitable impurities.

[0037] 2) mixing the powder high-entropy alloy steel material and propanol, coating on the surface of the cutter substrate after uniform mixing, and then performing laser cladding after drying, the mass percentage of the powder high-entropy alloy steel material and propanol being 95%:5%, and the coating thickness being 2mm;

[0038] 3) laser cladding, to obtain the kitchen cutter based on the powder high-entropy alloy steel, the laser power being 1800KW, the spot diameter being 0.7mm, the scanning speed being 120mm / min, the defocusing amount being 0, argon being used as the protective gas, and the gas flow being 40L / min.

[0039] Example 3

[0040] The preparation method of the kitchen cutter based on the powder high-entropy alloy steel specifically comprises the following steps:

[0041] 1) obtaining a powder high-entropy alloy steel material, the composition and content of which are specifically as follows: Ni: 25.5wt.%, Cr: 17.5wt.%, Ti: 9.5wt.%, Cu: 7wt.%, Ag: 9wt.%, Al: 6.5wt.%, B: 1.05wt.%, Nb: 1.05wt.%, La: 1.15wt.%, and the rest being Fe and inevitable impurities.

[0042] 2) the powder high-entropy alloy steel material and propanol are mixed, after uniform mixing, coated on the surface of the cutter base, after drying, laser cladding is carried out, the mass percentage of the powder high-entropy alloy steel material and propanol is 95%:5%, the coating thickness is 1mm;

[0043] 3) laser cladding, to obtain the kitchen cutter based on the powder high-entropy alloy steel, the laser power is 1750KW, the spot diameter is 0.7mm, the scanning speed is 125mm / min, the defocusing amount is 0, argon is used as the protective gas, and the gas flow is 40L / min.

[0044] Comparative example 1

[0045] The preparation method of the kitchen cutter based on the powder high-entropy alloy steel specifically includes the following steps:

[0046] 1) obtain a powder high-entropy alloy steel material, the components and contents of which are specifically: Ni: 25.5wt.%, Cr: 17.5wt.%, Ti: 9.5wt.%, Ag: 9wt.%, Al: 6.5wt.%, B: 1.05wt.%, Nb: 1.05wt.%, La: 1.15wt.%, and the rest is Fe and inevitable impurities.

[0047] 2) the powder high-entropy alloy steel material and propanol are mixed, after uniform mixing, coated on the surface of the cutter base, after drying, laser cladding is carried out, the mass percentage of the powder high-entropy alloy steel material and propanol is 95%:5%, the coating thickness is 2mm;

[0048] 3) laser cladding, to obtain the kitchen cutter based on the powder high-entropy alloy steel, the laser power is 1800KW, the spot diameter is 0.7mm, the scanning speed is 120mm / min, the defocusing amount is 0, argon is used as the protective gas, and the gas flow is 40L / min.

[0049] Comparative example 2

[0050] The preparation method of the kitchen cutter based on the powder high-entropy alloy steel specifically includes the following steps:

[0051] 1) obtain a powder high-entropy alloy steel material, the components and contents of which are specifically: Ni: 25.5wt.%, Cr: 17.5wt.%, Ti: 9.5wt.%, Cu: 7wt.%, Al: 6.5wt.%, B: 1.05wt.%, Nb: 1.05wt.%, La: 1.15wt.%, and the rest is Fe and inevitable impurities.

[0052] 2) the powder high-entropy alloy steel material and propanol are mixed, after uniform mixing, coated on the surface of the cutter base, after drying, laser cladding is carried out, the mass percentage of the powder high-entropy alloy steel material and propanol is 95%:5%, the coating thickness is 2mm;

[0053] 3) laser cladding, to obtain the kitchen cutter based on the powder high-entropy alloy steel, the laser power is 1800KW, the spot diameter is 0.7mm, the scanning speed is 120mm / min, the defocusing amount is 0, argon is used as the protective gas, and the gas flow is 40L / min.

[0054] Comparative Example 3

[0055] The preparation method of the kitchen cutter based on the powder high-entropy alloy steel specifically comprises the following steps:

[0056] 1) obtain a powder high-entropy alloy steel material, the components and contents of which are specifically: Ni: 25.5wt.%, Cr: 17.5wt.%, Ti: 9.5wt.%, Cu: 4wt.%, Ag: 5wt.%, Al: 6.5wt.%, B: 1.05wt.%, Nb: 1.05wt.%, La: 1.15wt.%, and the rest is Fe and inevitable impurities.

[0057] 2) the powder high-entropy alloy steel material and propanol are mixed, after uniform mixing, coated on the surface of the cutter base, after drying, laser cladding is carried out, the mass percentage of the powder high-entropy alloy steel material and propanol is 95%:5%, the coating thickness is 2mm;

[0058] 3) laser cladding, to obtain the kitchen cutter based on the powder high-entropy alloy steel, the laser power is 1800KW, the spot diameter is 0.7mm, the scanning speed is 120mm / min, the defocusing amount is 0, argon is used as the protective gas, and the gas flow is 40L / min.

[0059] Comparative Example 4

[0060] The preparation method of the kitchen cutter based on the powder high-entropy alloy steel specifically comprises the following steps:

[0061] 1) obtain a powder high-entropy alloy steel material, the components and contents of which are specifically: Ni: 25.5wt.%, Cr: 17.5wt.%, Ti: 9.5wt.%, Cu: 7wt.%, Ag: 9wt.%, Al: 9.5wt.%, B: 1.05wt.%, Nb: 1.05wt.%, La: 1.15wt.%, and the rest is Fe and inevitable impurities.

[0062] 2) The powder high-entropy alloy steel material and propanol are mixed, and after uniform mixing, they are coated on the surface of the tool substrate. After drying, laser cladding is performed. The mass percentage of the powder high-entropy alloy steel material and propanol is 95%:5%, and the coating thickness is 2 mm;

[0063] 3) Laser cladding is performed to obtain a kitchen tool based on a powder high-entropy alloy steel. The laser power is 1800 KW, the spot diameter is 0.7 mm, the scanning speed is 120 mm / min, the defocusing amount is 0, argon is used as the protective gas, and the gas flow is 40 L / min.

[0064] Comparative Example 5

[0065] The preparation method of the kitchen tool based on the powder high-entropy alloy steel specifically includes the following steps:

[0066] 1) A powder high-entropy alloy steel material is obtained. The components and contents are specifically as follows: Ni: 25.5 wt.%, Cr: 17.5 wt.%, Ti: 9.5 wt.%, Cu: 7 wt.%, Ag: 9 wt.%, Al: 3 wt.%, B: 1.05 wt.%, Nb: 1.05 wt.%, La: 1.15 wt.%, and the rest is Fe and unavoidable impurities.

[0067] 2) The powder high-entropy alloy steel material and propanol are mixed, and after uniform mixing, they are coated on the surface of the tool substrate. After drying, laser cladding is performed. The mass percentage of the powder high-entropy alloy steel material and propanol is 95%:5%, and the coating thickness is 2 mm;

[0068] 3) Laser cladding is performed to obtain a kitchen tool based on a powder high-entropy alloy steel. The laser power is 1800 KW, the spot diameter is 0.7 mm, the scanning speed is 120 mm / min, the defocusing amount is 0, argon is used as the protective gas, and the gas flow is 40 L / min.

[0069] Test formation:

[0070] After the tool preparation of each example and comparative example is completed, a sample with a size of 20x20 mm is cut along the cross section of the tool edge of the tool by using a wire cutting machine. After the sample is treated, microstructure analysis is performed.

[0071] A HV-1000 Vickers hardness tester is used to test the microhardness of the cladding layer.

[0072] After sterilization of the sample, Escherichia coli and Staphylococcus aureus are cultured in Luria-Bertani broth. The temperature is set to 37°C, and the time is set to 18 hours. Then, a bacteria-phosphate buffered saline co-culture solution with a concentration of 10 5 CFU / mL is prepared to perform antibacterial experiments.

[0073] Microhardness test and antibacterial test were carried out on each of the examples and each of the comparative examples, and the test results are as follows:

[0074] Example 1: The sample hardness can reach 874HV1. The antibacterial rate against E. coli can reach 99% in 48 hours, and the antibacterial rate against S. aureus can reach 99% in 48 hours.

[0075] Example 2: The sample hardness can reach 853HV1. The antibacterial rate against E. coli can reach 96% in 48 hours, and the antibacterial rate against S. aureus can reach 97% in 48 hours.

[0076] Example 3: The sample hardness can reach 821HV1. The antibacterial rate against E. coli can reach 97% in 48 hours, and the antibacterial rate against S. aureus can reach 97% in 48 hours.

[0077] Comparative Example 1: The sample hardness can reach 674HV1. The antibacterial rate against E. coli can reach 68% in 48 hours, and the antibacterial rate against S. aureus can reach 62% in 48 hours.

[0078] Comparative Example 2: The sample hardness can reach 630HV1. The antibacterial rate against E. coli can reach 61% in 48 hours, and the antibacterial rate against S. aureus can reach 64% in 48 hours.

[0079] Comparative Example 3: The sample hardness can reach 732HV1. The antibacterial rate against E. coli can reach 76% in 48 hours, and the antibacterial rate against S. aureus can reach 69% in 48 hours.

[0080] Comparative Example 4: The sample hardness can reach 785HV1. The antibacterial rate against E. coli can reach 81% in 48 hours, and the antibacterial rate against S. aureus can reach 83% in 48 hours.

[0081] Comparative Example 5: The sample hardness can reach 811HV1. The antibacterial rate against E. coli can reach 84% in 48 hours, and the antibacterial rate against S. aureus can reach 82% in 48 hours.

[0082] It can be seen that the amount of copper, silver and aluminum changes, which significantly affects the sample hardness and antibacterial rate, respectively.

[0083] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A kitchen knife laser cladding preparation method based on powder high-entropy alloy steel, characterized by, The specific steps are as follows: 1) obtain a powder high-entropy alloy steel material, and the components and contents are specifically: Ni: 24.5-26.5wt.%, Cr: 17.5-18.5wt.%, Ti: 8.5-9.5wt.%, Cu: 6.5-7.5wt.%, Ag: 8.5-9.5wt.%, Al: 6-7.5wt.%, B: 0.75-1.05wt.%, Nb: 0.90-1.05wt.%, La: 1.10-1.15wt.%, and the rest is Fe and unavoidable impurities; 2) mix the powder high-entropy alloy steel material and propanol, coat on the surface of the cutter substrate after uniform mixing, and then dry and perform laser cladding; 3) laser cladding to obtain a kitchen cutter based on powder high-entropy alloy steel.

2. The method for laser cladding of kitchen knives based on powder high-entropy alloy steel according to claim 1, characterized in that, In step 1): The purity of each component in the powder high-entropy alloy steel material is greater than or equal to 99%; The particle size of the powder high-entropy alloy steel material is 250-400 mesh.

3. The method for preparing kitchen knives based on powder high-entropy alloy steel by laser cladding according to claim 1, characterized in that, In step 2): the mass percentages of the powder high-entropy alloy steel material and propanol are 90%-95% and 5%-10%, respectively.

4. The method for laser cladding of kitchen knives based on powder high-entropy alloy steel according to claim 1, characterized in that, In step 2): the coating thickness is 1-2 mm.

5. The method for laser cladding of kitchen knives based on powder high-entropy alloy steel according to claim 4, characterized in that, In step 2): during the coating process, ethanol is added uniformly, and the mass ratio of ethanol to propanol is 1:(5-10).

6. The method for laser cladding of kitchen knives based on powder high-entropy alloy steel according to claim 1, characterized in that, In step 3): argon is used as the protective gas, and the gas flow is 35-40 L / min.

7. A kitchen cutter prepared by the preparation method according to any one of claims 1 to 6.

8. The kitchen knife of claim 7, wherein: The use environment humidity is 20-95%.