CN108433514B

CN108433514B - Metal/ceramic composite pot, preparation method thereof and cooking pot

Info

Publication number: CN108433514B
Application number: CN201710083411.5A
Authority: CN
Inventors: 王小鹰; 张垚; 杨保民; 程永康; 李福友; 李景文; 郭雄伟; 瞿月红
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2017-02-16
Filing date: 2017-02-16
Publication date: 2021-04-20
Anticipated expiration: 2037-02-16
Also published as: CN108433514A

Abstract

The invention relates to the technical field of electric heating appliances and discloses a metal/ceramic composite pot, a preparation method thereof and a cooking pot. The metal/ceramic composite pot has the advantages of a metal inner pot and a ceramic inner pot, has good heat conduction characteristics and heat preservation characteristics, has high mechanical strength and high surface hardness, is not easy to deform, has the advantages of high adhesive force, scraping resistance, corrosion resistance, non-adhesion and the like due to the fact that the wear-resistant non-stick coating is sprayed on the metal/ceramic composite pot, and is more convenient to use and better in effect.

Description

Metal/ceramic composite pot, preparation method thereof and cooking pot

Technical Field

The invention relates to the technical field of electric heating appliances, in particular to a metal/ceramic composite pot, a preparation method thereof and a cooking pot.

Background

At present, inner pots or inner containers of electric heating cooking appliances such as electric cookers and electric pressure cookers are usually formed by stretching aluminum plates, iron plates or composite plates, pot bodies are easy to deform and poor in heat preservation effect in the processes of forming and transporting, and the inner surfaces of the pot bodies are often coated with plastic or resin non-stick coatings which are inferior to ceramic coatings in food safety. Instead, what solves these problems is another commonly used inner pan: the pot in the pottery, but pot is breakable in the pottery to because pottery does not have magnetic conductivity, be not suitable for the condition of IH coil panel heating, mostly be limited to the ordinary hot dish direct heating's of low end cooking utensil, simultaneously because pottery self heat conductivility is poor, this makes the heating efficiency of product low, and the energy consumption is big.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a metal/ceramic composite pot, a preparation method thereof and a cooking pot.

In order to achieve the above object, in a first aspect, the present invention provides a metal/ceramic composite pot, including a pot body and a protective coating formed on an inner surface of the pot body, wherein the pot body is made of a mixed material containing a metal material and a ceramic material.

In a second aspect, the invention provides a preparation method of a metal/ceramic composite pot, which comprises the following steps:

(1) uniformly mixing a metal material, a ceramic material, an optional binder and an optional dispersant to obtain a mixed material;

(2) preparing a pot body from the mixed material obtained in the step (1);

(3) and (3) forming a protective coating on the inner surface of the pot body obtained in the step (2).

In a third aspect, the invention provides a cooking pot, which comprises an inner pot, wherein the inner pot is the metal/ceramic composite pot.

According to the invention, the pot body is prepared from the mixed material containing the metal material and the ceramic material, and the protective coating is formed on the inner surface of the pot body, so that the balance point between the metal inner pot and the ceramic inner pot is successfully found, and the metal/ceramic composite pot with the advantages of the metal inner pot and the ceramic inner pot is obtained. Specifically, this compound pan possesses the heat conduction characteristic of pot in the metal, can be used to the electric heat cooking utensil of IH coil panel heating, also has the heat preservation characteristic of pot in the pottery, can be used to the electric heat cooking utensil of ordinary hot plate heating, can realize good heat preservation effect, and has higher mechanical strength and great surface hardness, non-deformable, and because the spraying has advantages such as wear-resisting non-stick coating again such as adhesion force height, resistant scraping, corrosion-resistant, on-stick, it is more convenient to use, the effect is better.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

Fig. 1 is a schematic structural view of the metal/ceramic composite cookware of the present invention.

Fig. 2 is an enlarged structural schematic view of the metal/ceramic composite cookware of the present invention.

Description of the reference numerals

1 is a pan body, 2 is a sintering neck between metal material particles and between ceramic material particles, 3 is metal material particles or ceramic material particles, and 4 is a protective coating.

Detailed Description

The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

In a first aspect, as shown in fig. 1, the invention provides a metal/ceramic composite pot, which comprises a pot body 1 and a protective coating 4 formed on the inner surface of the pot body, wherein the pot body 1 is made of a mixed material containing a metal material and a ceramic material.

In the metal/ceramic composite pot, the pot body is made of a mixed material containing a metal material and a ceramic material, and preferably, the thickness of the pot body is 1.5-4mm, and the thickness of the protective coating is 15-40 mu m.

In the metal/ceramic composite pot of the present invention, the metal material is not particularly limited, and may be conventionally selected in the art, and preferably, the metal material is iron, aluminum, stainless steel, or a metal composite material.

In the metal/ceramic composite pot of the present invention, the ceramic material is not particularly limited and may be conventionally selected in the art, and preferably, the ceramic material is clay.

In the metal/ceramic composite pot tool, in order to better combine the advantages of the metal inner pot and the ceramic inner pot and better balance various performance characteristics, the weight ratio of the metal material to the ceramic material is 1: 0.1 to 10, more preferably 1: 0.2 to 5, more preferably 1: 0.3-3.

In the metal/ceramic composite pot, the metal material and the ceramic material are uniformly mixed and distributed to form the pot body, and the inner surface of the pot body is provided with a large amount of ceramic components, so that food-grade wear-resistant non-stick coatings with good bonding property with the ceramic material, such as ceramic coatings, plastic coatings or resin coatings, can be coated on the inner surface of the pot body, and the ceramic coatings are preferably selected.

(2) preparing a pot body from the mixed material obtained in the step (1);

In the method of the invention, in order to better combine the advantages of the metal inner pot and the ceramic inner pot and better balance various performance characteristics, preferably, in the step (1), the weight ratio of the metal material to the ceramic material is 1: 0.1 to 10, more preferably 1: 0.2 to 5, more preferably 1: 0.3-3.

In the method of the present invention, the binder is not particularly limited and may be conventionally selected in the art, and preferably, the binder is at least one of polyvinyl alcohol (PVA), polyvinyl butyral (PVB), and polymethyl methacrylate (PMMA), and is used in an amount of 0 to 10 wt%, more preferably 3 to 10 wt%, based on the total weight of the metal material and the ceramic material.

In the method of the present invention, the dispersant is not particularly limited and may be conventionally selected in the art, and preferably, the dispersant is at least one of sodium silicate, sodium carbonate, sodium citrate, polyacrylamide and polyvinyl alcohol, and is used in an amount of 0 to 1% by weight, preferably 0.1 to 1% by weight, based on the total weight of the metallic material and the ceramic material.

The selection of the metal material and the ceramic material can be referred to the above corresponding contents, and will not be described herein again. The specific kinds and amounts of the binder and the dispersant can be determined according to the specific selection of the metal material and the ceramic material and the subsequent specific process for preparing the pan body, which are well known to those skilled in the art and will not be described herein again.

In the method of the present invention, the materials may be mixed and ground by a ball mill, a stirrer, a mixer, a centrifuge, or the like, and for the convenience of mixing and sintering, it is preferable that in the step (1), the mixed material is spherical particles having a particle diameter of 10nm to 100 μm.

In the method of the present invention, in the step (2), the method for forming the pot body is not particularly limited, and various methods for forming a pot body from a powder material or a granular material, which are commonly used in the art, may be used, for example, a powder metallurgy method, specifically, a hot isostatic pressing sintering method, a powder injection molding method, a loose sintering method, a press molding method, or a plasma sintering method. The specific operating steps and conditions for hot isostatic pressing sintering, powder injection molding, loose-packed sintering, compression molding and plasma sintering are not particularly limited and may each be a routine choice in the art, all well known to those skilled in the art. Preferably, the conditions of the press molding method include: the sintering temperature is 700-1400 ℃, the sintering time is 1-4h, and the pressure is 0-500 MPa. Those skilled in the art can select the corresponding conditions according to the specific types of the metal material and the ceramic material, which are well known to those skilled in the art and will not be described herein.

In the present invention, as shown in fig. 2, during the process of making the pot body 1 by powder sintering, sintering necks (i.e. the sintering necks 2 between the metal material particles and between the ceramic material particles and the ceramic material particles) can be formed between the metal material particles and between the ceramic material particles, depending on the types of the metal material and the ceramic material (i.e. the metal material particles or the ceramic material particles 3), under a certain temperature condition, the metal material and the ceramic material can also be subjected to diffusion compounding to form a metal-metal skeleton network and a ceramic-ceramic skeleton network, the metal material frameworks are filled among the frameworks formed by the ceramic material particles, and the ceramic material frameworks are filled among the frameworks formed by the metal material particles, so that the metal/ceramic composite pot body with certain strength is formed.

In the method of the present invention, in the step (3), the method for forming the protective coating is not particularly limited, and various methods for forming the coating, such as spraying, are commonly used in the art, and the specific spraying operation and conditions are well known to those skilled in the art and will not be described herein again.

Preferably, the protective coating is a wear-resistant non-stick coating so as to improve the performances of scratch resistance, wear resistance, corrosion resistance, non-stick property and the like of the inner surface of the pot body, so that the inner pot is more convenient to use and has better effect. The coating is not particularly limited and may be selected conventionally in the art and is commercially available, wherein the wear resistant non-stick coating is preferably a ceramic coating, but also a plastic coating and a resin coating.

Preferably, the cooking pot is an electric cooker, an electric pressure cooker or an electric stewpot.

Examples

The present invention will be described in detail below by way of examples, but the present invention is not limited thereto.

In the following examples and comparative examples, each material was commercially available unless otherwise specified, and each method was a method commonly used in the art.

Ceramic non-stick coatings were purchased from New Hill trade, Inc. of Zhongshan under the designation SSG-9338M 0-1717.

The resin non-stick coating is organic silicon modified resin which is purchased from Beijing Huatongru Rachi materials science and technology Limited and has the mark of SCH-101.

Example 1

(1) Uniformly mixing and grinding 1kg of iron powder, 2kg of clay powder, 0.15kg of polyvinyl alcohol and 0.015kg of sodium silicate to obtain a spherical mixed material with the particle size of 1-10 mu m;

(2) and (2) preparing the mixed material obtained in the step (1) into a pot body with the thickness of 3mm by compression molding, wherein the compression molding conditions comprise: the sintering temperature is 1400 ℃, the sintering time is 3h, and the pressure is 300 MPa;

(3) and (3) spraying ceramic non-stick paint on the inner surface of the pot body obtained in the step (2) to form a ceramic wear-resistant non-stick coating with the thickness of 30 mu m, so as to obtain the iron/ceramic composite pot.

Example 2

(1) Uniformly mixing and grinding 1kg of aluminum powder, 3kg of clay powder, 0.32kg of polymethyl methacrylate and 0.032kg of polyacrylamide to obtain a spherical mixed material with the particle size of 1-20 mu m;

(2) and (2) preparing the mixed material obtained in the step (1) into a pot body with the thickness of 2.5mm by compression molding, wherein the compression molding conditions comprise: the sintering temperature is 800 ℃, the sintering time is 2.5h, and the pressure is 400 MPa;

(3) and (3) spraying ceramic non-stick paint on the inner surface of the pot body obtained in the step (2) to form a wear-resistant non-stick coating with the thickness of 20 microns, so as to obtain the aluminum/ceramic composite pot.

Example 3

(1) Uniformly mixing 3kg of stainless steel powder, 1kg of clay powder, 0.24kg of polyvinyl butyral and 0.024kg of sodium citrate, and grinding to obtain a spherical mixed material with the particle size of 900nm-10 mu m;

(2) and (2) preparing the mixed material obtained in the step (1) into a pot body with the thickness of 2mm by compression molding, wherein the compression molding conditions comprise: the sintering temperature is 1400 ℃, the sintering time is 1.5h, and the pressure is 500 MPa;

(3) and (3) spraying ceramic non-stick paint on the inner surface of the pot body obtained in the step (2) to form a wear-resistant non-stick coating with the thickness of 25 mu m, so as to obtain the stainless steel/ceramic composite pot.

Example 4

The procedure of example 1 was followed except that the raw materials in step (1) were 10kg of iron powder, 1kg of clay powder, 0.55kg of polyvinyl alcohol and 0.055kg of sodium silicate.

Example 5

The procedure of example 1 was followed except that the raw materials in step (1) were 1kg of iron powder, 10kg of clay powder, 0.55kg of polyvinyl alcohol and 0.055kg of sodium silicate.

Example 6

The procedure of example 1 was followed except that the raw materials in step (1) were 5kg of iron powder, 1kg of clay powder, 0.3kg of polyvinyl alcohol and 0.03kg of sodium silicate.

Example 7

The procedure of example 1 was followed except that the raw materials in step (1) were 1kg of iron powder, 5kg of clay powder, 0.3kg of polyvinyl alcohol and 0.03kg of sodium silicate.

Example 8

The process of example 1 is followed except that in step (3) the ceramic non-stick coating is replaced with a resin non-stick coating.

Comparative example 1

The procedure of example 1 was followed except that the raw materials in step (1) were 1kg of iron powder, 0.15kg of polyvinyl alcohol and 0.015kg of sodium silicate.

Comparative example 2

The procedure of example 1 was followed except that the raw materials in step (1) were 1kg of clay powder, 0.15kg of polyvinyl alcohol and 0.015kg of sodium silicate.

Test examples

(1) Adhesion force: according to GB/T9286-1998, the bottom surfaces of the pots obtained in examples 1-8 and comparative examples 1-2 were scribed by a blade to be 1mm²The protective coating is tightly adhered by using a 3M610 test tape at the same diagonal position of 45 degrees in 100 square lattices, then the rubberized fabric is quickly pulled up at an angle of 90 degrees, and the process is repeated3 times, the grades were recorded according to the grading standards of Table 1 in GB/T9286-1998, and the results are shown in Table 1.

(2) Vickers hardness: the vickers hardness of the pots obtained in examples 1 to 8 and comparative examples 1 to 2 was measured, and the results are shown in table 1.

(3) Scratch resistance hardness: according to GB/T6739-.

(4) Magnetic permeability: the magnetic properties of the pots obtained in examples 1 to 8 and comparative examples 1 to 2 were measured by a vibrating sample magnetometer (VSM model Lake Shore 7404), and the results are shown in Table 1.

(5) Thermal conductivity: the thermal conductivity of the pots obtained in examples 1 to 8 and comparative examples 1 to 2 was measured by a thermal conductivity measuring instrument (model DRL-II/III/III-C, available from Hunan Tan instruments Ltd.) and the results are shown in Table 1.

TABLE 1

	Adhesion force	Vickers hardness	Hardness to scratch	Magnetic permeability	Thermal conductivity
						Example 1	Level 0	△△△	8H	○○○	□□
Example 2	Level 0	△△△	8H	○○○	□□
						Example 3	Level 0	△△△	8H	○○○	□□
Example 4	Level 1	△	8H	○○○○○	□□□□
						Example 5	Level 0	△△△△	8H	○●	□
Example 6	Level 0	△△	8H	○○○○	□□□
						Example 7	Level 0	△△△	8H	○○	□□
Example 8	Level 1	△△△	H	○○○	□□
						Comparative example 1	Grade 3	▲	8H	○○○○○○	□□□□□□
Comparative example 2	Level 0	△△△△△▲	8H	--	□

Note: more Δ indicates greater hardness (-0.5 Δ), more o indicates greater magnetic permeability (-no, ● indicates 0.5 o), more □ indicates greater thermal conductivity.

As can be seen from table 1, the metal/ceramic composite pot of the present invention has the advantages of both the metal inner pot and the ceramic inner pot, has good heat conduction characteristics and heat preservation characteristics, has high mechanical strength and large surface hardness, is not easy to deform, has the advantages of high adhesion, scratch resistance, corrosion resistance, non-stick property, etc. due to the sprayed wear-resistant non-stick coating, and is more convenient to use and better in effect. When the weight ratio of the metal material to the ceramic material is 1: 0.3 to 3, the aforementioned performance characteristics can be better balanced.

The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. The metal/ceramic composite pot is characterized by comprising a pot body and a protective coating formed on the inner surface of the pot body, wherein the pot body is made of a mixed material containing a metal material and a ceramic material, and the mixed material is spherical particles;

wherein the weight ratio of the metal material to the ceramic material is 1: 0.3 to 3;

in the sintering process of the material, sintering necks can be formed between metal material particles and between ceramic material particles and ceramic material particles, and the metal material and the ceramic material are subjected to diffusion compounding to form a metal-metal skeleton network and a ceramic-ceramic skeleton network, so that the metal/ceramic composite pot body is formed.

2. The pot as claimed in claim 1, wherein the thickness of the pot body is 1.5-4mm, and the thickness of the protective coating is 15-40 μm.

3. A cookware according to claim 1 or 2, wherein said metallic material is iron, aluminium, stainless steel or a metal composite.

4. A cookware according to claim 1 or 2, wherein said ceramic material is clay.

5. A cookware according to claim 1 or 2, wherein said protective coating is a wear resistant non-stick coating.

6. The cookware of claim 5, wherein said protective coating is a ceramic coating, a resin coating or a plastic coating.

7. The method for manufacturing the metal/ceramic composite pot according to any one of claims 1 to 6, wherein the method comprises the following steps:

(2) preparing a pot body from the mixed material obtained in the step (1);

(3) forming a protective coating on the inner surface of the pot body obtained in the step (2);

wherein in the step (1), the weight ratio of the metal material to the ceramic material is 1: 0.3-3.

8. The method according to claim 7, wherein in the step (1), the binder is at least one of polyvinyl alcohol, polyvinyl butyral and polymethyl methacrylate, and is used in an amount of 0 to 10 wt% based on the total weight of the metallic material and the ceramic material;

the dispersant is at least one of sodium silicate, sodium carbonate, sodium citrate, polyacrylamide and polyvinyl alcohol, and the dosage of the dispersant is 0-1 wt% based on the total weight of the metal material and the ceramic material.

9. The method according to claim 8, wherein in the step (1), the binder is used in an amount of 3 to 10 wt% based on the total weight of the metallic material and the ceramic material;

the dispersant is used in an amount of 0.1 to 1% by weight, based on the total weight of the metallic material and the ceramic material.

10. The method according to claim 7, wherein in the step (1), the mixed material is spherical particles having a particle size of 10nm to 100 μm.

11. The method as claimed in claim 7, wherein in the step (2), the method for forming the pot body is a powder metallurgy method.

12. The method of claim 11, wherein in the step (2), the pan body is formed by a hot isostatic pressing sintering method, a powder injection molding method, a loose sintering method, a press molding method or a plasma sintering method.

13. The method of claim 12, wherein the conditions of the compression molding process include: the sintering temperature is 700-1400 ℃, the sintering time is 1-4h, and the pressure is 0-500 MPa.

14. A cookware, characterized in that the cookware comprises an inner pot, the inner pot is the cookware of any one of claims 1-6.

15. The cookware of claim 14, wherein said cookware is an electric cooker, an electric pressure cooker or an electric stewpot.