CN108085673B - Preparation method of cookware with cold spraying magnetic conductive coating - Google Patents
Preparation method of cookware with cold spraying magnetic conductive coating Download PDFInfo
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- CN108085673B CN108085673B CN201611046145.0A CN201611046145A CN108085673B CN 108085673 B CN108085673 B CN 108085673B CN 201611046145 A CN201611046145 A CN 201611046145A CN 108085673 B CN108085673 B CN 108085673B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
Abstract
The invention relates to a preparation method of cookware with a cold spraying magnetic conductive coating, which comprises the following steps: powder cold spraying of magnetic conduction metal is carried out on the surface of the base material of the cookware through working gas, and the magnetic conduction metal powder forms a magnetic conduction coating on the surface of the base material of the cookware, so that the cookware containing the cold spraying magnetic conduction coating is obtained. The magnetic coating is prepared on the surface of the cookware or the cooker so as to realize good electromagnetic heating effect. The invention also relates to a cookware containing the cold spraying magnetic conductive coating.
Description
Technical Field
The invention relates to the technical field of cookware, in particular to a preparation method of cookware with a cold spraying magnetic conductive coating.
Background
Aluminum alloy, 304 stainless steel, ceramic and other materials are widely applied in household appliance products, but most cookware made of non-magnetic or weak magnetic conductivity materials does not have a good electromagnetic heating function.
Disclosure of Invention
The invention aims to solve the technical problem of providing a process for preparing a magnetic coating by cold spraying on a cooker or a cooker, which can spray a layer of magnetic coating with excellent mechanical and physical properties on the bottom of the outer surface of the cooker made of nonmagnetic (such as aluminum alloy) or weak magnetic materials (such as 304 stainless steel) by strictly controlling the process parameters of the cold spraying technology, such as spraying temperature, spraying pressure, spraying distance, material particle size and the like, so as to ensure good electromagnetic heating effect of the cooker.
The technical scheme for solving the technical problems is as follows: a preparation method of cookware with cold spraying magnetic conductive coatings comprises the following steps: powder cold spraying of magnetic conduction metal is carried out on the surface of the base material of the cookware through working gas, and the magnetic conduction metal powder forms a magnetic conduction coating on the surface of the base material of the cookware, so that the cookware containing the cold spraying magnetic conduction coating is obtained.
Cold Spray (CS), also known as gas dynamic Spray, is a method of depositing a coating layer by strong plastic deformation after high-speed solid particles with certain plasticity collide with a substrate. Under normal conditions, the general concept is that the solid particles will erode the matrix when they collide with the matrix.
The invention has the beneficial effects that:
the magnetic coating is prepared on the surface of the cookware or the cooker so as to realize good electromagnetic heating effect.
The heating temperature of the sprayed powder is obviously lower than that of thermal spraying in cold spraying, so that the sprayed material can be basically kept from being oxidized, the sprayed powder can be ensured to have high deposition rate, high deposition efficiency and low powder oxidation degree by strictly controlling the technological parameters such as the preheating temperature of the gas, the air pressure of a spray gun and the like in order to ensure that the whole coating has good performance, and the coating is ensured to have the characteristics of single tissue component, small heat affected zone and heat stress, strong binding force, few internal defects and the like.
The magnetic conductive coating prepared at the bottom of the aluminum pot by the cold spraying technology has obviously better performance than the magnetic conductive coating prepared by the hot spraying technology, is expected to partially replace the prior aluminum alloy/double-bottom stainless steel plate and cookware prepared by an aluminum alloy/stainless steel composite plate, obviously reduces the manufacturing cost of the IH heating cookware, and can also achieve the similar purpose of quick and efficient electromagnetic heating.
The coating with high magnetic permeability can be prepared at the bottom of the cookware, so that the good electromagnetic heating function of the cookware can be realized. The magnetic coating prepared by using fine powder of Fe, Ni, Co, Fe-Si alloy, 430 stainless steel and the like as raw materials through a high-speed airflow assisted ultrasonic rapid cold spraying technology in a heating state is good in binding force, compact in structure, low in porosity and strong in electromagnetic heating induction capability. The electromagnetic heating efficiency of the non-magnetic or weak-magnetic cookware can be remarkably improved.
By strictly controlling the technological process and parameters of cold spraying, the oxidation rate of the material is reduced (less than or equal to 1%), the internal structure compactness of the coating is improved (less than or equal to 0.3%), and the high-efficiency electromagnetic heating efficiency (the maximum power reaches 1500-2000W) can be obtained under the condition of ensuring the thickness of the thin coating (0.1-0.6 mm). According to the technology, the magnetic coating which is thin in thickness and low in porosity is sprayed on the bottom of the pot made of the non-magnetic or weak magnetic conductivity material, so that the pot made of the material has good electromagnetic heating capacity, and the electromagnetic heating efficiency is effectively improved.
On the basis of the technical scheme, the invention can be further improved as follows:
further, the working gas is one or more of air, helium and nitrogen.
The technical scheme has the advantages that the air, the helium and the nitrogen respectively have the characteristic of protective atmosphere, and the base material powder with the protective coating is not oxidized in a large amount in the coating preparation process.
Further, the injection pressure of the cold spraying is 1-3.5 Mpa.
The beneficial effect of adopting above-mentioned technical scheme is: the pressure is adopted, so that the coating has good binding force, and if the pressure is too high, the problems that the later-stage sprayed powder is difficult to deposit and the thickness of the coating cannot be increased are caused; if the pressure is too low, the rate of the metal powder is lower than the critical rate of deposition, and the deposition on the surface of the substrate is difficult.
Furthermore, the spraying temperature of the cold spraying is 673-1323K.
The beneficial effect of adopting above-mentioned technical scheme is: the temperature is adopted, so that the compactness, the binding force and the like of the coating are favorably improved, and if the temperature is too high, the spray gun can be subjected to high temperature for a long time, and parts are easy to damage; if the temperature is too low, problems such as poor coating adhesion and compactness can result.
Further, the gas velocity of the cold spraying is 1-2.4 m3/min。
The beneficial effect of adopting above-mentioned technical scheme is: the gas velocity is adopted, so that the powder particles are ensured to have enough velocity (slightly higher than the deposition critical velocity), the powder can be effectively deposited, if the gas velocity is too high, the particle flight velocity is too high, the original coating is eroded, and the later coating is difficult to deposit; if the gas velocity is too low, the problem that the flying speed of the powder particles is low and the powder is difficult to deposit on the surface of the pot body can be caused.
Further, the conveying speed of the cold-sprayed magnetic powder is 5-15 kg/h.
The beneficial effect of adopting above-mentioned technical scheme is: the conveying speed is adopted, so that the effective deposition rate of the powder is improved, and if the conveying speed is too high, the average flight speed of the powder is reduced, and the deposition rate of the powder is reduced; if the conveying speed is too low, a problem of lowering the deposition rate of the powder may result.
Further, the spraying distance of the cold spraying is 10-50 mm.
The beneficial effect of adopting above-mentioned technical scheme is: the spraying distance is adopted, so that the deposition efficiency of the coating is improved, and if the spraying distance is too high, the problem that the particles are difficult to deposit due to too low flying speed of the particles to the surface of the substrate can be caused; if the spray distance is too low, the particles will fly to the surface of the substrate at too high a speed, and the coating prepared at the earlier stage will be eroded away, and the coating at the later stage will be difficult to deposit and thicken.
Further, the power consumption of cold spraying is 15-55 kW.
The beneficial effect of adopting above-mentioned technical scheme is: the power consumption is beneficial to effective heating of the protective gas, the hot protective gas can preheat the powder well to enable the powder to reach a proper spraying temperature, and if the power consumption is too high, the gas temperature is too high, and the problem of damage to a sealing ring of a nozzle and the like is easily caused; if the consumed power is too low, the problems of low heating temperature of the protective gas, insufficient powder preheating temperature, poor coating bonding force and the like can be caused.
Furthermore, the magnetic conductive metal is one or a mixture of several of Fe, Ni, Co, Fe-Si and stainless steel.
The beneficial effect of adopting above-mentioned technical scheme is: fe. The Ni, Co, Fe-Si and 430 stainless steel respectively have the characteristic of good magnetic permeability, and the coating prepared by the powder has good electromagnetic heating effect.
Furthermore, the powder granularity of the magnetic conductive metal is 1-50 mu m.
The beneficial effect of adopting above-mentioned technical scheme is: the adoption of the powder of the magnetic conductive metal with smaller granularity is beneficial to improving the compactness and the binding force of the coating, and if the granularity of the powder is too high, the problems of rough surface of the coating, poor compactness of the coating and the like are easily caused.
Further, the magnetic conduction coating is located on the outer surface of the base material of the pot and is located on the lower portion and/or the bottom of the side wall of the base material of the pot. .
The beneficial effect of adopting above-mentioned technical scheme is: the magnetic conductive coating is positioned at the lower part and the bottom of the side wall of the base material of the pot or is only positioned at the bottom of the base material, so that the magnetic conductive coating is matched with an electromagnetic heating coil panel arranged outside the magnetic conductive coating, and the heating efficiency of the magnetic conductive coating is improved.
Furthermore, the base material of the pot is one or more of aluminum alloy, stainless steel, high-strength ceramic and high-strength glass.
The beneficial effect of adopting above-mentioned technical scheme is: the aluminum alloy, the stainless steel, the high-strength ceramic and the high-strength glass respectively have the characteristics of non-magnetic conductivity or weak magnetic conductivity, and have good electromagnetic heating effects after the magnetic conductive coating is prepared on the surface of the aluminum alloy, the stainless steel, the high-strength ceramic and the high-strength glass.
Furthermore, the thickness of the magnetic conductive coating is 0.1-0.6 mm.
The beneficial effect of adopting above-mentioned technical scheme is: the thickness of the magnetic conductive coating is 0.1-0.6 mm, so that the coating is favorable for ensuring a good electromagnetic heating effect, the production efficiency is improved, and if the thickness is too high, the production efficiency is reduced; if the thickness is too low, a problem of low electromagnetic heating power of the coating layer may result.
Furthermore, the porosity of the magnetic conductive coating is 0.05-0.25%.
The beneficial effect of adopting above-mentioned technical scheme is: the magnetic conductive coating has the characteristics of high compactness, strong binding force and difficult shedding, the porosity of 0.05-0.25% has the beneficial effects of improving the binding force and the electromagnetic heating power of the magnetic conductive coating, and the problem of difficult implementation of the process can be caused when the porosity is lower than the range; above this range, problems of reduced binding force of the magnetically conductive coating and reduced electromagnetic heating power may result.
Another technical solution of the present invention for solving the above technical problems is as follows: a cookware is prepared according to the preparation method of the cookware containing the cold spraying magnetic conductive coating.
Drawings
FIG. 1 is a schematic view of a partial structure of the present invention.
FIG. 2 shows the results of porosity measurement in example 2.
In the drawings, the components represented by the respective reference numerals are listed below:
1. cookware base material, 2, magnetic conductive coating.
Detailed Description
The principles and features of this invention are described below in conjunction with specific embodiments, which are set forth merely to illustrate the invention and are not intended to limit the scope of the invention.
The invention relates to a preparation method of cookware with a cold spraying magnetic conductive coating, which comprises the following steps: powder cold spraying of magnetic conduction metal is carried out on the surface of the base material of the cookware through working gas, and the magnetic conduction metal powder forms a magnetic conduction coating on the surface of the base material of the cookware, so that the cookware containing the cold spraying magnetic conduction coating is obtained.
The working gas is one or more of air, helium and nitrogen.
The cold spraying has the injection pressure of 1-3.5 Mpa, the injection temperature of 673-1323K and the gas velocity of 1-2.4 m3Min, the magnetic conduction powder conveying speed is 5-15 kg/h, the spraying distance is 10-50 mm, and the power consumption is 15-55 kW. The spraying distance refers to the distance between the powder outlet (from which the powder is sprayed after being mixed with the working gas) of the spraying equipment and the object to be sprayed. The spraying pressure refers to the pressure of the working gas.
The magnetic conductive metal is one or a mixture of more of Fe, Ni, Co, Fe-Si and stainless steel.
The powder granularity of the magnetic conductive metal is 1-50 mu m.
The magnetic conductive coating is positioned on the outer surface of the base material of the cookware or the lower part and the bottom of the side wall or only the area of the bottom.
The base material of the pot is one or more of aluminum alloy, stainless steel, high-strength ceramic and high-strength glass.
In the specific operation of spraying, a cold spray apparatus may be employed. The cold spraying equipment can be obtained by research and development of the cold spraying equipment and can also be obtained by market, and in each embodiment, the cold spraying is carried out by adopting a commercially available supersonic speed high-pressure cold air dynamic spraying system.
Specifically, the following steps can be performed:
1. performing matrix pretreatment on the outer surface of a base material of the pot body, wherein the matrix pretreatment method is to perform oil removal and degreasing treatment on impurities on the outer surface of the base material of the pot body; optionally, before the base body is pretreated, carrying out sand blasting treatment on the surface to be sprayed of the base material of the pot;
2. the powder cold spraying of magnetic conduction metal is on the surface of the substrate of pan through working gas, the powder of magnetic conduction metal forms the magnetic conduction coating on the surface of the substrate of pan, and specific technological parameter is:
(1) the magnetic conductive powder is one or more of mixed powder of Fe, Ni, Co, Fe-Si and stainless steel with the purity of 99.0-99.8%, and the particle size of the powder is 1-50 mu m; working gas is one or more of air, helium and nitrogen, and the spraying distance is 10-50 mm; the spraying temperature (namely the gas heating temperature) is 673-1323K; the consumed power is 15-55 kW; the conveying speed of the magnetic powder is 5-15 kg/h; the injection pressure is 1-3.5 Mpa; the gas velocity is 1-2.4 m3/min；
(2) The thickness of the prepared magnetic conductive coating is 0.1-0.6 mm, and the porosity is 0.05-0.25%; the oxidation rate of the matrix material is 0.05-0.15%; the magnetic conductive coating is positioned on the outer surface of the base material of the cookware or the lower part and the bottom of the side wall or only the bottom area of the base material.
3. And (5) completing the preparation to obtain the cookware with the cold spraying magnetic conductive coating.
Further, the parameters of step 2 may also be:
the magnetic conductive powder is one or more of mixed powder of Fe, Ni, Co, Fe-Si and stainless steel with the purity of 99.0-99.8%, and the particle size of the powder is 10-40 mu m; worker's toolOne or more of air, helium and nitrogen is adopted as gas, and the spraying distance is 25-40 mm; the spraying temperature (namely the gas heating temperature) is 973-1273K; the consumed power is 20-50 kW; the conveying speed of the magnetic powder is 6-10 kg/h; the injection pressure is 1.8-2.5 Mpa; the gas velocity is 1.5-2.4 m3/min。
The thickness of the prepared magnetic conductive coating is 0.1-0.5 mm, and the porosity is 0.12-0.25%; the oxidation rate of the matrix material is 0.06-0.10%; the magnetic conductive coating is positioned on the outer surface of the base material of the cookware or the lower part and the bottom of the side wall or only the bottom area of the base material.
In the attached drawings of the specification, fig. 1 is an abstract attached drawing, and as shown in fig. 1, fig. 1 is a partial structural schematic view of a cookware containing a cold spraying magnetic conductive coating. The magnetic conductive coating 2 is sprayed at the bottom of the cookware base material (or cooker base material) or the transition position of the bottom and the circular arc, the cookware base material 1 and the magnetic conductive coating 2 are combined together mainly in a mechanical combination mode, and the cookware base material and the magnetic conductive coating form the electromagnetic heating cookware/cooker.
The magnetic conductive metal layer can be positioned at the bottom of the cooker or on the side wall of the cooker, and the position of the magnetic conductive metal layer on the cooker is not particularly restricted.
The magnetic conduction metal layer can be distributed on the outer surface of the base material of the whole cooker, and can also be partially distributed on the outer surface of the base material of the cooker, so that reasonable selection can be carried out according to specific use requirements.
The following is a detailed description of some specific embodiments.
Example one
The invention relates to a preparation method of a pot containing a cold spraying magnetic conductive coating, which specifically comprises the following steps:
1. carrying out oil removal and degreasing treatment on the surface to be sprayed of the outer surface of the cookware base material; the base material of the pot is an aluminum pot;
2. the powder cold spraying of magnetic conduction metal is on the surface of the substrate of pan through working gas, the powder of magnetic conduction metal forms the magnetic conduction coating on the surface of the substrate of pan, and specific technological parameter is:
(1) the magnetic conductive powder is selected from Fe powder with purity of 99.0-99.8%The particle size of the powder is 10-20 mu m; the working gas is high-purity nitrogen, the purity of the nitrogen is 99.99%, and the spraying distance is 25-40 mm; the spraying temperature (namely the gas heating temperature) is 973-1073K; the consumed power is 20-35 kW; the conveying speed of the magnetic powder is 6-9 kg/h; the injection pressure is 1.8-2.0 Mpa; the gas velocity is 1.5-1.8 m3/min；
(2) The thickness of the prepared magnetic conductive coating is 0.1-0.2 mm, and the porosity is 0.12-0.16%; the oxidation rate of the matrix material is 0.06-0.09%; the magnetic conductive coating is positioned at the bottom of the base material of the pot.
3. And (5) completing the preparation to obtain the cookware with the cold spraying magnetic conductive coating.
Example two
The invention relates to a preparation method of a pot containing a cold spraying magnetic conductive coating, which specifically comprises the following steps:
1. shielding the position, which does not need to be sprayed, of the outer surface of the pot base material by using a shielding jig, wherein the pot base material is a 304 stainless steel inner pot;
2. the powder cold spraying of magnetic conduction metal is on the surface of the substrate of pan through working gas, the powder of magnetic conduction metal forms the magnetic conduction coating on the surface of the substrate of pan, and specific technological parameter is:
(1) the magnetic conductive powder is 430 stainless steel powder with the purity of 99.0-99.8%, and the particle size of the powder is 10-20 mu m; the working gas is high-purity nitrogen, the purity of the nitrogen is 99.99%, and the spraying distance is 25-40 mm; the spraying temperature (namely the gas heating temperature) is 1173-1223K; the consumed power is 20-45 kW; the conveying speed of the magnetic powder is 8-10 kg/h; the injection pressure is 2-2.2 Mpa; the gas velocity is 1.8-2.0 m3/min；
(2) The thickness of the prepared magnetic conductive coating is 0.4-0.5 mm, and the porosity is 0.12-0.18%; the oxidation rate of the matrix material is 0.07-0.1%; the magnetic conduction coating is located on the outer surface of the base material of the pot.
3. And (5) completing the preparation to obtain the cookware with the cold spraying magnetic conductive coating.
EXAMPLE III
The invention relates to a preparation method of a pot containing a cold spraying magnetic conductive coating, which specifically comprises the following steps:
1. shielding the position, which does not need to be sprayed, of the outer surface of the cookware base material by using a shielding jig, wherein the cookware base material is an aluminum alloy inner pot;
2. the powder cold spraying of magnetic conduction metal is on the surface of the substrate of pan through working gas, the powder of magnetic conduction metal forms the magnetic conduction coating on the surface of the substrate of pan, and specific technological parameter is:
(1) the magnetic conductive powder is selected from Fe-Si alloy powder with the purity of 99.0-99.5%, and the particle size of the powder is 20-40 mu m; the working gas is high-purity nitrogen, the purity of the nitrogen is 99.99%, and the spraying distance is 25-40 mm; the spraying temperature (namely the gas heating temperature) is 1023-1073K; the consumed power is 20-30 kW; the conveying speed of the magnetic powder is 7-9 kg/h; the injection pressure is 1.8-2.1 MPa; the gas velocity is 1.8-2.0 m3/min；
(2) The thickness of the prepared magnetic conductive coating is 0.3-0.4 mm, and the porosity is 0.15-0.2%; the oxidation rate of the matrix material is 0.08-0.1%; the magnetic conduction coating is located on the outer surface of the base material of the pot.
3. And (5) completing the preparation to obtain the cookware with the cold spraying magnetic conductive coating.
Example four
The invention relates to a preparation method of a pot containing a cold spraying magnetic conductive coating, which specifically comprises the following steps:
1. shielding the position, which does not need to be sprayed, of the outer surface of the cookware base material by using a shielding jig, wherein the cookware base material is an aluminum alloy inner pot;
2. the powder cold spraying of magnetic conduction metal is on the surface of the substrate of pan through working gas, the powder of magnetic conduction metal forms the magnetic conduction coating on the surface of the substrate of pan, and specific technological parameter is:
(1) the magnetic conductive powder is selected from Ni powder with the purity of 99.0-99.5%, and the particle size of the powder is 20-40 mu m; the working gas is high-purity nitrogen, the purity of the nitrogen is 99.99%, and the spraying distance is 30-40 mm; the spraying temperature (namely the gas heating temperature) is 1223-1273K; the consumed power is 30-50 kW; the conveying speed of the magnetic powder is 8-10 kg/h; pressure of injectionThe force is 2.3-2.5 Mpa; the gas velocity is 2.0-2.2 m3/min；
(2) The thickness of the prepared magnetic conductive coating is 0.2-0.3 mm, and the porosity is 0.15-0.2%; the oxidation rate of the matrix material is 0.08-0.1%; the magnetic conduction coating is located on the outer surface of the base material of the pot.
3. And (5) completing the preparation to obtain the cookware with the cold spraying magnetic conductive coating.
EXAMPLE five
The invention relates to a preparation method of a pot containing a cold spraying magnetic conductive coating, which specifically comprises the following steps:
1. shielding the position, which does not need to be sprayed, of the outer surface of the pot base material by using a shielding jig, wherein the pot base material is a high-boron glass inner pot;
2. the powder cold spraying of magnetic conduction metal is on the surface of the substrate of pan through working gas, the powder of magnetic conduction metal forms the magnetic conduction coating on the surface of the substrate of pan, and specific technological parameter is:
(1) the magnetic conductive powder is Fe alloy powder with the purity of 99.0-99.5%, and the particle size of the powder is 20-40 mu m; the working gas is high-purity helium, the purity of the helium is 99.9%, and the spraying distance is 25-40 mm; the spraying temperature (namely the gas heating temperature) is 1223-1273K; the consumed power is 30-40 kW; the conveying speed of the magnetic powder is 7-9 kg/h; the injection pressure is 2.1-2.4 Mpa; the gas velocity is 2.0-2.4 m3/min；
(2) The thickness of the prepared magnetic conductive coating is 0.15-0.25 mm, and the porosity is 0.18-0.21%; the oxidation rate of the matrix material is 0.08-0.1%; the magnetic conduction coating is located on the outer surface of the base material of the pot.
3. And (5) completing the preparation to obtain the cookware with the cold spraying magnetic conductive coating.
EXAMPLE six
The invention relates to a preparation method of a pot containing a cold spraying magnetic conductive coating, which specifically comprises the following steps:
1. shielding the position, which does not need to be sprayed, of the outer surface of the pot base material by using a shielding jig, wherein the pot base material is a high-strength aluminum oxide ceramic inner pot;
2. the powder cold spraying of magnetic conduction metal is on the surface of the substrate of pan through working gas, the powder of magnetic conduction metal forms the magnetic conduction coating on the surface of the substrate of pan, and specific technological parameter is:
(1) the magnetic conductive powder is 430 stainless steel powder with the purity of 99.0-99.5%, and the particle size of the powder is 10-20 mu m; the working gas is high-purity helium, the purity of the helium is 99.9%, and the spraying distance is 25-40 mm; the spraying temperature (namely the gas heating temperature) is 1123-1173K; the consumed power is 20-30 kW; the conveying speed of the magnetic powder is 7-9 kg/h; the injection pressure is 1.8-2.0 Mpa; the gas velocity is 1.8-2.0 m3/min；
(2) The thickness of the prepared magnetic conductive coating is 0.2-0.3 mm, and the porosity is 0.18-0.20%; the oxidation rate of the matrix material is 0.08-0.1%; the magnetic conduction coating is located on the outer surface of the base material of the pot.
3. And (5) completing the preparation to obtain the cookware with the cold spraying magnetic conductive coating.
EXAMPLE seven
The invention relates to a preparation method of a pot containing a cold spraying magnetic conductive coating, which specifically comprises the following steps:
1. shielding the position, which does not need to be sprayed, of the outer surface of the pot base material by using a shielding jig, wherein the pot base material is a 304 stainless steel inner pot;
2. the powder cold spraying of magnetic conduction metal is on the surface of the substrate of pan through working gas, the powder of magnetic conduction metal forms the magnetic conduction coating on the surface of the substrate of pan, and specific technological parameter is:
(1) the magnetic conductive powder is selected from Ni powder with the purity of 99.0-99.5%, and the particle size of the powder is 10-40 mu m; the working gas is high-purity nitrogen, the purity of the nitrogen is 99.99%, and the spraying distance is 25-40 mm; the spraying temperature (namely the gas heating temperature) is 1173-1223K; the consumed power is 20-35 kW; the conveying speed of the magnetic powder is 8-9 kg/h; the injection pressure is 2.1-2.4 Mpa; the gas velocity is 2.0-2.1 m3/min；
(2) The thickness of the prepared magnetic conductive coating is 0.2-0.3 mm, and the porosity is 0.2-0.25%; the oxidation rate of the matrix material is 0.08-0.1%; the magnetic conduction coating is located on the outer surface of the base material of the pot.
3. And (5) completing the preparation to obtain the cookware with the cold spraying magnetic conductive coating.
Comparative example 1
The spraying temperature (i.e., the gas heating temperature) was adjusted to 473K to 523K based on example 1, and the rest was the same as example 1.
Comparative example 2
The spraying temperature (i.e., gas heating temperature) was adjusted to 573 to 623K based on example 1, and the rest was the same as example 1.
Comparative example 3
The spraying distance is adjusted to be 50-60 mm on the basis of the embodiment 1, and the rest is the same as the embodiment 1.
Comparative example 4
The spraying distance is adjusted to be 70-80 mm on the basis of the embodiment 1, and the rest is the same as the embodiment 1.
Comparative example 5
The particle size of the powder was adjusted to 50 to 70 μm in addition to example 1, and the rest was the same as example 1.
Comparative example 6
The particle size of the powder was adjusted to 60 to 80 μm in addition to example 1, and the rest was the same as example 1.
Comparative example 7
The injection pressure is adjusted to 0.8-1.0 MPa based on the embodiment 1, and the rest is the same as the embodiment 1.
The porosity, binding force and electromagnetic heating power of each example and each comparative example are respectively detected as follows.
FIG. 2 shows the results of porosity measurements of example 2 of the present invention. The porosity was calculated as: percentage of area of pores to area of sample to be measured. The detection shows that the porosity is 0.14 percent, which shows that the coating has less pores, very compact structure and good compactness.
The results of measuring the porosity, the bonding force and the electromagnetic heating power of each example and comparative example are shown in table 1.
TABLE 1
It can be seen from the data in table 1 that by strictly controlling the cold spraying process parameters, a highly dense, strong binding force, and single texture magnetic coating can be prepared on the surface of cookware or cookware made of non-magnetic materials. Effectively realizes the magnetic conductivity of the cookware made of non-magnetic materials or improves the electromagnetic heating function of the cookware made of weak magnetic conductivity materials. The raw materials of the magnetic coating are fine powder of Fe, Ni, Co, Fe-Si, 430 stainless steel and the like with excellent magnetic conductivity, and the preferred coating is characterized in that: the thickness is 0.15-0.4 mm, the porosity is 0.05-0.25%, and the oxidation rate of the base material is 0.05-0.15%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (13)
1. A preparation method of a pot containing a cold spraying magnetic conductive coating is characterized by comprising the following steps: cold spraying powder of magnetic conductive metal on the surface of a base material of a cookware through working gas, wherein the powder of the magnetic conductive metal forms a magnetic conductive coating on the surface of the base material of the cookware, so as to obtain the cookware containing the cold spraying magnetic conductive coating, the porosity of the magnetic conductive coating is 0.05-0.25%, the magnetic conductive metal is selected from one or a mixture of more of Fe, Ni, Co and Fe-Si, or the magnetic conductive metal is selected from one or a mixture of more of Fe, stainless steel, Co and Fe-Si.
2. The method for preparing cookware with cold spray magnetic conductive coating according to claim 1, wherein the working gas is one or more of air, helium and nitrogen.
3. The preparation method of the cookware with the cold spraying magnetic conductive coating according to claim 1, wherein the spraying pressure of the cold spraying is 1-3.5 Mpa.
4. The preparation method of the cookware with the cold spraying magnetic conductive coating according to claim 1, wherein the spraying temperature of the cold spraying is 673-1323K.
5. The method for preparing cookware with cold spray magnetic conductive coating according to claim 1, wherein the gas velocity of the cold spray is 1-2.4 m3/min。
6. The method for preparing cookware with cold-sprayed magnetic conductive coating according to claim 1, wherein the conveying speed of the cold-sprayed magnetic conductive powder is 5-15 kg/h.
7. The method for manufacturing cookware with a cold spray magnetic conductive coating according to claim 1, wherein the spray distance of the cold spray is 10-50 mm.
8. The preparation method of the cookware with the cold spraying magnetic conductive coating according to claim 1, wherein the power consumption of the cold spraying is 15-55 kW.
9. The method for preparing cookware with cold-sprayed magnetic conductive coating according to any one of claims 1 to 8, wherein the powder size of the magnetic conductive metal is 1 to 50 μm.
10. The method for preparing cookware with cold spray magnetic conductive coating according to any of claims 1 to 8, wherein the magnetic conductive coating is located on the outer surface of the base material of cookware and on the lower portion and/or bottom of the sidewall of the base material of cookware.
11. The method for manufacturing cookware with cold spray magnetic conductive coating according to any one of claims 1 to 8, wherein the base material of the cookware is one or more of aluminum alloy, stainless steel, high strength ceramic and high strength glass.
12. The method for preparing cookware with a magnetically conductive cold spray coating according to any one of claims 1 to 8, wherein the thickness of the magnetically conductive coating is 0.1-0.6 mm.
13. A cookware, characterized by being prepared according to the preparation method of cookware with cold spraying magnetic conductive coating as claimed in any one of claims 1 to 12.
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| CN108085673B true CN108085673B (en) | 2020-01-03 |
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| CN110786698A (en) * | 2019-11-12 | 2020-02-14 | 厦门佰事兴新材料科技有限公司 | Container containing composite coating |
| CN112877684B (en) * | 2021-01-12 | 2023-02-03 | 江西省科学院应用物理研究所 | Cu alloy magnetic conductive coating and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1651605A (en) * | 2005-03-09 | 2005-08-10 | 沈阳工业大学 | Spray coating technology of magnesium alloy surface protective layer |
| CN105534318A (en) * | 2015-11-18 | 2016-05-04 | 浙江伯是购厨具有限公司 | Long-acting magnetic-conductive and anti-corrosion composite coating for electromagnetic cooker and preparation method of composite coating |
| CN106435564A (en) * | 2016-11-14 | 2017-02-22 | 北京联合涂层技术有限公司 | Electromagnetic coating of high-performance cooker and manufacturing method of electromagnetic coating |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1651605A (en) * | 2005-03-09 | 2005-08-10 | 沈阳工业大学 | Spray coating technology of magnesium alloy surface protective layer |
| CN105534318A (en) * | 2015-11-18 | 2016-05-04 | 浙江伯是购厨具有限公司 | Long-acting magnetic-conductive and anti-corrosion composite coating for electromagnetic cooker and preparation method of composite coating |
| CN106435564A (en) * | 2016-11-14 | 2017-02-22 | 北京联合涂层技术有限公司 | Electromagnetic coating of high-performance cooker and manufacturing method of electromagnetic coating |
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