WO2008049272A1

WO2008049272A1 - Ceramic cooker and preparing method for the same

Info

Publication number: WO2008049272A1
Application number: PCT/CN2006/002849
Authority: WO
Inventors: Yuen Keung Raymond Chin; Wai Yin Sandie Chin Chan
Original assignee: Yuen Keung Raymond Chin; Wai Yin Sandie Chin Chan
Priority date: 2006-10-25
Filing date: 2006-10-25
Publication date: 2008-05-02
Also published as: CN101861112A

Abstract

A ceramic cookware comprises a metal frame embed on the bottom of the ceramic cookware. The material of the metal frame is selected from any one of the metal materials provided with characteristic of electromagnetism induction. And a preparing method for the above mentioned ceramic cookware is provided.

Description

Ceramic cookware and preparation method thereof

Technical field

The present invention relates to a ceramic cookware, particularly a ceramic cookware applicable to an induction cooker, and a method of preparing the same

Currently, there are two main types of cookware on the market, metal cookware and ceramic cookware. Among them, metal cookware has the characteristics of fast and uniform heat conduction, so the energy utilization rate is high. At the same time, the metal cookware has high mechanical strength and good ductility, and the iron-based metal cookware can also be used for an induction cooker. However, metal cookware has a small heat capacity and a temperature change that is too fast, so that the nutrients of the food to be cooked are easily destroyed, and the original taste cannot be maintained.

In contrast, ceramic cookware has poor thermal conductivity, but because of this, ceramic cookware has a relatively gentle temperature rise and fall, so that the original flavor of the food can be kept to the maximum extent, and the nutrients in the food are not decomposed and destroyed. Make the dishes you cook more delicious. Moreover, the ceramic material itself is rich in a variety of trace elements beneficial to the human body, thereby further improving the nutrient composition of the food and contributing to human health. However, the disadvantages of ceramic cookware are also obvious, that is, the material is hard and brittle, brittle, and the heat transfer is slow and uneven, so it is easy to be broken by the sudden heat. In addition, ceramic cookware does not have magnetic permeability and is therefore not suitable for induction cookers.

In response to the advantages and disadvantages of the above metal and ceramic cookware, the researchers combined ceramic and metal materials to develop a new type of cookware that combines the advantages of both materials to better meet the needs of everyday life. .

For example, Chinese Patent No. 94226955.1 discloses a ceramic cookware which is tightly wrapped with a matching metal sheath on the bottom and lower outer surfaces. The mechanical strength and heat transfer efficiency and uniformity of the ceramic cookware are greatly improved. However, since the metal layer is only wrapped on the outer surface of the ceramic body, the bonding strength with the ceramic body is not high, so that it is easy to fall off or separate.

Chinese Patent No. 200420016998.6 discloses a ceramic cooker for an induction cooker, the bottom of which is a flat bottom with a layer of far-infrared radiation material attached thereto, and an electromagnetic induction heating layer attached to the far-infrared radiation material layer, and a protective layer thereon . The cookware overcomes the defects that the ceramic cookware cannot be used in the induction cooker, but does not solve the problem that the ceramic material is brittle and fragile, and cannot be applied to other additions. The heat method is heated by an open flame.

Chinese Patent No. 200420044143.4 discloses a ceramic cookware having a bonding layer at the bottom of the cookware, in which metal powder is contained. The cookware is suitable for an induction cooker, and the magnetic conductive layer and the ceramic body are firmly combined and are not easily detached, and the metal powder is not easily oxidized. However, the cookware also does not solve the problem of brittleness and brittleness of the ceramic material, and there is no significant improvement in the defects of low heat transfer efficiency and unevenness of the ceramic. Summary of the invention

In order to overcome the deficiencies in the prior art, the inventors of the present invention have finally developed a new type of ceramic cookware which combines the advantages of ceramics and metal materials through long-term research, and has higher heat transfer efficiency and brittleness than conventional ceramic appliances. It reduces, and overcomes the defects that ceramic cookware can not be applied to the induction cooker, while retaining the advantages of ceramic utensils in cooking food.

One aspect of the invention provides a ceramic cookware comprising a ceramic body and a metal frame, wherein the metal frame is embedded in the bottom of the ceramic body, and the material of the metal frame is selected from any metallic material having electromagnetic induction.

Preferably, the metal frame is combined with the ceramic body in a physical fastening manner.

In a preferred embodiment of the invention, the metal frame comprises one or more layers of metal sheets and/or metal mesh. Preferably, each of the metal plates has a thickness of 0.1 mm to 20 mm, and each layer of the metal mesh has a thickness of 0.1 mm to 5 mm.

In a further preferred embodiment, the metal frame is of a multi-layered structure with the layers being joined by metal struts. Preferably, the distance between the layers is from 0.1 mm to 20 mm.

In certain preferred embodiments, the metal frame is completely encapsulated within the ceramic body. In other preferred embodiments, the metal frame portion is exposed outside the ceramic body to provide direct contact with a heat source.

Since the thermal conductivity of the metal is stronger than that of the ceramic material, the combination of the metal frame and the ceramic body can improve the heat transfer efficiency of the ceramic cookware, thereby increasing the utilization of thermal energy and achieving energy saving. Moreover, the metal material can uniformly transfer heat to various positions on the bottom of the ceramic body, thereby improving heat transfer uniformity of the cookware as a whole, and avoiding cracking of the ceramic material due to uneven heat. Further, the metal material used has a characteristic of generating heat on the induction cooker, and the generated heat can be transmitted to the cookware for cooking, and thus the ceramic cooker of the present invention can be directly applied to the induction cooker. On the other hand, the fitting of the metal frame and the ceramic material overcomes the disadvantage that the ceramic material is brittle and fragile to some extent, and the strength of the cooker of the invention is improved. Another aspect of the present invention also provides a method of preparing a ceramic cooker of the present invention, comprising:

1) combining a ceramic material with a metal frame to form a billet;

2) Sintering the obtained billet. The barrel of the drawing is to be explained

Figure la is a bottom cross-sectional view of a preferred embodiment of the cookware of the present invention.

Figure lb is a bottom cross-sectional view of another preferred embodiment of the cookware of the present invention.

Figure lc is a top plan view of the metal frame of the cookware shown in Figures la and lb.

Figure 2a is a bottom cross-sectional view of still another preferred embodiment of the cookware of the present invention.

Figure 2b is a top plan view of the metal frame of the cookware shown in Figure 2a. detailed description

As described above, the present invention provides a ceramic cooker comprising a ceramic body and a metal frame, wherein the metal frame is embedded in the bottom of the ceramic body, and the material of the metal frame is selected from any metal material having electromagnetic induction.

The term "cooker" as used herein is a broad concept that encompasses a wide range of cookware, including but not limited to pots, bowls, pots, soups, tea sets, potions, etc., in addition to cookware in the usual sense. Baking tray and so on.

Metallic materials having electromagnetic induction that can be employed in the present invention include, but are not limited to, iron, cobalt, nickel, and alloys thereof.

The metal frame can be combined with the bottom of the ceramic body in any manner known in the art, provided that the metal frame is firmly bonded to the ceramic body. In a specific embodiment, the metal frame is bonded to the ceramic body by physical snapping, and the physical snapping can also be accomplished in any manner known in the art.

The material of the ceramic body of the present invention must have the same or a similar expansion coefficient as the material of the metal frame used to avoid detachment or cracking of the ceramic body from the metal frame due to the difference in expansion coefficient during use. The present invention does not have strict requirements on the structure and shape of the metal frame to be used, as long as it can be firmly bonded to the bottom of the ceramic body. Preferably, the metal frame has a structure that facilitates bonding of the ceramic body to the metal frame, such as various lines, grooves, holes, and the like.

In a preferred embodiment, the metal frame comprises one or more layers of metal plates and/or metal network. Preferably, each of the metal plates has a thickness of 0.1 mm to 20 mm, and each layer of the metal mesh has a thickness of 0.1 mm to 5 mm. If the metal mesh is composed of a wire, the wire has a diameter of 0.1 mm to 5 mm.

In the ceramic cooker of the present invention, the metal frame may be completely wrapped in the ceramic body or partially exposed to the outside of the ceramic body. Preferably, if the metal mesh portion is included in the metal frame, the metal mesh portion is completely wrapped in the ceramic body.

As shown in Fig. la, in a particularly preferred embodiment, the metal frame 2 is a single layer of metal plate partially exposed outside the ceramic body 1 so as to be in direct contact with a heat source (not shown). The metal frame 2 has a tapered through hole 3, and a part of the ceramic body 1 is filled in the through hole 3, thereby firmly bonding the ceramic body 1 and the metal frame 2.

As shown in Figure lb, in another particularly preferred embodiment, the metal frame 2 is a single layer of metal sheet that is completely wrapped within the ceramic body 1. The single layer metal plate also has a through hole 3.

As shown in Fig. 1c, the metal frame 2 has a circular shape as a whole, and corresponds to the bottom shape of the ceramic body 1, and has a through hole 3 therein. The number of the through holes 3 is such that the ceramic body 1 and the metal frame 2 are firmly bonded.

In another particularly preferred embodiment, the metal frame is a single layer metal mesh and the metal mesh is completely encapsulated within the ceramic body.

In other preferred embodiments, the metal frame is a multilayer structure in which the layers are joined by metal struts. The metal post may be a solder joint formed by bump welding. Preferably, the distance between the layers is from 0.1 mm to 20 mm. This distance is used to fill the ceramic material so that the ceramic material is integrated with the metal frame to form a reinforced concrete structure.

It will be understood by those skilled in the art that when the metal frame of the present invention has a multilayer structure, it is not actually required that all of the layers of the material be metals having electromagnetic induction.

In a further preferred embodiment, the metal frame is comprised of a metal backing and one or more layers of metal or metal mesh. Particularly preferably, a part of the surface of the metal base of the metal frame is exposed outside the ceramic body, and the rest of the metal frame is completely wrapped in the ceramic body. Particularly preferably, the metal base plate has a similar shape to the bottom of the ceramic body, and the edge portion of the bottom plate is tightly coupled to the ceramic body in a physical snap fit.

As shown in Fig. 2a, in a particularly preferred embodiment, the metal frame 2 comprises a metal base plate 21 and a metal mesh 22 which are connected to the metal mesh 22 by metal posts 23. Its The middle metal base plate 21 is partially exposed, and the other portions of the metal frame 2 are completely wrapped in the ceramic body 1.

As shown in Fig. 2b, the metal base plate 21 and the metal mesh 22 are both substantially circular to accommodate the bottom shape of the ceramic body 1. The metal base plate 21 and the metal mesh 22 are connected by a metal post 23.

The metal frame used in the present invention may be integrally cast, or may be integrally formed by a plurality of metal sheets/webs by a conventional means such as welding. Particularly preferably, the multilayer structures are joined by bump welding or spot welding.

Another aspect of the present invention provides a method of preparing a ceramic cooker of the present invention, comprising:

1) pressing the ceramic material together with the metal frame to form a billet;

2) Sintering the obtained billet.

In the process of the invention, the pressure can be applied by hydraulic, hydraulic or pneumatic pressure to compact the billet.

In a particularly preferred embodiment, the method of the invention is carried out by the following steps:

The prepared metal frame is placed in the mold of the cookware, and sufficient ceramic material is placed on the metal frame, and then the ceramic material and the metal frame are pressed into shape by another manufacturing mold. By pressing, the ceramic material is filled in the voids of the metal frame to be firmly bonded. Finally, the press-formed blank is placed in a ceramic sintering furnace to be sintered to obtain a desired product.

The ceramic sintering process of the present invention is not different from the conventional sintering process as long as the temperature does not exceed the melting point of the metal material used.

It is to be understood that the foregoing detailed description is not to be construed A person skilled in the art can make various modifications, substitutions and alterations to the present invention without departing from the spirit and scope of the invention.

Claims

Claim

A ceramic cookware comprising a ceramic body and a metal frame, wherein the metal frame is embedded in a bottom of the ceramic body, and the material of the metal frame is selected from any metal material having electromagnetic induction.

2. The ceramic cookware according to claim 1, wherein the metal frame is bonded to the ceramic body in a physical fastening manner.

The ceramic cooker according to claim 1 or 2, wherein the metal frame is a single-layer metal plate or a metal mesh.

The ceramic cookware according to claim 1 or 2, wherein the metal frame comprises a multilayer metal plate and/or a metal mesh joined by a metal post.

The ceramic cooker according to claim 4, wherein a distance between the layers of the metal frame is 0.1 mm to 20 mm.

The ceramic cooker according to any one of claims 3 to 5, wherein the metal plate has a thickness of 0.1 mm to 20 mm, and the metal mesh has a thickness of 0.1 mm to 5 mm.

The ceramic cooker according to any one of claims 1 to 6, wherein the metal frame has a structure for facilitating bonding of the ceramic body to the metal frame, the structure being selected from various lines, Grooves and ^^ holes.

The ceramic cookware according to any one of claims 1 to 7, wherein the metal frame is completely wrapped in the ceramic body.

The ceramic cookware according to any one of claims 1 to 7, wherein the metal frame portion is exposed outside the ceramic body.

10. The method of preparing a ceramic cookware according to any one of claims 1-9, comprising:

1) combining a ceramic material with a metal frame to form a billet;

2) Sintering the obtained billet.

11. The method of claim 10, wherein the step of pressing the ceramic material with the metal frame by hydraulic, water pressure and/or air pressure in step 1).