Cooking utensil combining bamboo charcoal, graphite and ceramic glaze

Abstract

The invention provides a cooking utensil combining bamboo charcoal, graphite and ceramic glaze, and relates to the technical field of ceramic glaze firing, and the cooking utensil comprises the following steps: S1, carrying out die-casting molding on a charcoal-ceramic green body; s2, preliminary firing of the green body: firing the carbon ceramic green body at a high temperature until graphitization; s3, smearing a carbon-ceramic composite layer: stirring and ball-milling raw materials in the carbon-ceramic composite layer, and then smearing the raw materials on the surface of the green body; s4, vacuum negative-pressure soaking: putting the carbon-ceramic composite cooking utensil into a vacuum negative-pressure tank, soaking the carbon-ceramic composite cooking utensil in a silicon-aluminum nano solvent for 1 time, and then taking out the carbon-ceramic composite cooking utensil; s5, secondary firing: putting the green body coated with the composite layer into an anaerobic sintering furnace for secondary firing; s6, glazing: coating the outer surface of the semi-finished product subjected to secondary firing with glaze; and S7, firing for the third time to obtain the carbon-ceramic composite cooking utensil. The composite layer which can be combined with the carbon ceramic green body material to repair the rough part of the surface layer of the carbon ceramic green body material and can also be combined with the ceramic glaze is additionally arranged, so that the appearance of a finished product can be smooth and flat while the original performance of the finished product is maintained.

Description

Technical Field

[0001] This application relates to the technical field of ceramic glaze firing, and particularly to a cooking utensil that combines bamboo charcoal and graphite with ceramic glaze. Background Art

[0002] After the carbon ceramic blank in the related art is fired and formed, there will be fine particles or pits on its surface, and later using ceramic glaze or Teflon coating usually cannot directly make it smooth and flat.

[0003] Therefore, this application proposes to apply a carbon ceramic composite layer to the preparation process of carbon ceramic cooking utensils to solve the above problems. Summary of the Invention

[0004] In order to overcome the deficiencies mentioned in the above background art, the embodiments of this application provide a cooking utensil that combines bamboo charcoal and graphite with ceramic glaze, and a composite layer is added that can not only combine with the outer surface of the carbon ceramic blank to repair its rough surface layer, but also combine with the ceramic glaze, so that the prepared finished product can maintain its original performance while making its outer surface smooth and flat.

[0005] The technical solution adopted by the embodiments of this application to solve its technical problems is as follows:

[0006] A cooking utensil that combines bamboo charcoal and graphite with ceramic glaze, including the following steps:

[0007] S1. Die-cast the carbon ceramic blank;

[0008] S2. Preliminarily fire the blank, and heat the carbon ceramic blank to graphitization at high temperature;

[0009] S3. Apply the carbon ceramic composite layer, and the raw materials in the carbon ceramic composite layer are evenly applied to the surface of the blank after stirring and ball milling processes;

[0010] S4. Vacuum negative pressure immersion, put the carbon ceramic composite cooking utensil into a vacuum negative pressure tank, and soak it in a silicon-aluminum nano-solvent for 1 hour and then take it out;

[0011] S5. Secondary firing, put the blank coated with the composite layer into an oxygen-free sintering furnace for secondary firing, take it out after firing at a certain temperature, and cool it to room temperature;

[0012] S6. Glaze application, evenly apply the glaze on the outer surface of the semi-finished product after secondary firing;

[0013] S7. Tertiary firing, put the carbon ceramic semi-finished product after glaze application into an oxygen-free sintering furnace for tertiary firing, take it out after firing at a certain temperature, and cool it to room temperature, then the carbon ceramic composite cooking utensil can be obtained.

[0014] According to some embodiments of the present application, in the step S2, the temperature of the preliminary firing of the carbon-ceramic green body is controlled to 1400°C, and it can be graphitized at ±1400°C to improve the electrical conductivity, thermal conductivity and corrosion resistance of the green body. The sintering time is controlled within 30 - 35h.

[0015] According to some embodiments of the present application, in the step S4, the final temperature of the second firing of the green body coated with the composite layer is controlled at 1300°C - 1330°C, and the sintering time is controlled within ±15h.

[0016] According to some embodiments of the present application, in the step S6, the temperature of the third firing after glazing is finally controlled at 1200°C - 1250°C, and the sintering time is controlled within 8 - 9h.

[0017] According to some embodiments of the present application, in terms of weight parts, the components of the carbon-ceramic green body material in the step S1 are specifically: 10 parts of potassium feldspar, 5.5 parts of sodium feldspar, 10 parts of light calcium carbonate, 15 parts of Yixing barium carbonate, 10 parts of Longyan kaolin, 20 parts of red firing block, 10 parts of calcined kaolin, 10 parts of talc and 30 parts of light glaze powder.

[0018] According to some embodiments of the present application, in the step S1, the die-casting forming of the carbon-ceramic green body is specifically subdivided into the following steps:

[0019] A. Powder preparation: The raw materials used for the ceramic green body need to be prepared into the required ceramic powder through crushing and mixing processes.

[0020] B. Mold design: Design the mold according to the shape and size requirements of the product, and put a predetermined amount of ceramic powder into the mold.

[0021] C. Forming: Put the mold into a hot press, heat it to a certain temperature and apply a certain pressure to hot-press the ceramic powder into shape. During the forming process, it is necessary to control the heating temperature and maintain a certain pressure holding time to ensure that the ceramic powder is fully sintered and solidified.

[0022] According to some embodiments of the present application, in the sub-step C of the step S1, the pressure for hot-press forming is 55 - 65KN, and the pressure holding time is 3s.

[0023] According to some embodiments of the present application, in the step S3, the raw materials in the carbon-ceramic composite layer are fully stirred and mixed at 110 - 130°C.

[0024] According to some embodiments of the present application, in the step S3, the raw materials in the carbon-ceramic composite layer are ball-milled with water for 48h during the preparation process. After ball-milling, the carbon-ceramic composite layer is sprayed onto the outer surface of the carbon-ceramic green body by a spray gun heated to 180 - 220°C, with a thickness of 50μm. Then it is dried at 200 - 250°C for 30 - 60s, and then naturally cooled to room temperature.

[0025] According to some embodiments of the present application, in step S5, a colored or transparent ceramic glaze is sprayed onto the semi-finished carbon-ceramic blank by a spraying method, and after standing for 55-65 minutes, it is placed in an anaerobic sintering furnace.

[0026] The advantages of the embodiments of the present application are as follows:

[0027] The present application adds a composite layer that can both combine with the carbon-ceramic blank material to repair the rough part of its surface layer and combine with the ceramic glaze. Compared with directly coating the surface with Teflon coating or ceramic glaze, the finished product after preparation can not only maintain its original performance but also make its appearance smooth and flat. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A flowchart of a cooking utensil that combines bamboo charcoal and graphite with ceramic glaze provided by an embodiment of the present application;

[0029] Figure 2 A scatter line graph composed of the time and temperature of the third firing of the carbon-ceramic cooking utensil of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The technical solutions in the embodiments of the present application are to solve the problems raised in the above background technology, and the general idea is as follows:

[0031] Embodiment 1:

[0032] Please refer to Figure 1 and Figure 2 , a cooking utensil that combines bamboo charcoal and graphite with ceramic glaze, including the following steps:

[0033] S1. Die-casting the carbon-ceramic blank;

[0034] S2. Preliminary firing of the blank, the carbon-ceramic blank is fired at a high temperature until graphitized;

[0035] S3. Applying a carbon-ceramic composite layer, the raw materials in the carbon-ceramic composite layer are evenly applied to the surface of the blank after being stirred and ball-milled;

[0036] S4. Vacuum negative pressure soaking, putting the carbon-ceramic composite cooking utensil into a vacuum negative pressure tank, soaking it with a silicon-aluminum nano-solvent for 1 hour and then taking it out;

[0037] S5. Secondary firing, putting the blank coated with the composite layer into an anaerobic sintering furnace for secondary firing, taking it out after firing at a certain temperature, and cooling it to room temperature;

[0038] S6. Glazing, evenly applying the glaze on the outer surface of the semi-finished product after secondary firing;

[0039] S7. Third firing: The semi-finished carbon-ceramic product after glazing is put into an anaerobic sintering furnace for the third firing. After firing at a certain temperature, it is taken out and cooled to room temperature to obtain the carbon-ceramic composite cooking utensil.

[0040] In this embodiment, the present application adds a composite layer that can not only combine with the carbon-ceramic blank material to repair the rough part of its surface layer, but also combine with the ceramic glaze, so that the prepared finished product can not only maintain its original performance, but also make its appearance smooth and flat.

[0041] It should also be noted that in the past, when cooking utensils were used on an induction cooker, because they could not be magnetized, an iron sheet had to be placed at the bottom of the cooking utensil to assist the normal magnetization use of the cooking utensil. In some related technologies, a layer of metal was plated on the outer wall of the cooking utensil to assist the magnetization of the cooking utensil, but the cooking utensil itself did not have a magnetization effect. Therefore, the present application uses a carbon-ceramic blank (that is, combining graphite with the ceramic material for making the blank). The advantage is that graphitization will occur when the blank is fired to ±1400°C, and it can conduct electricity directly and be used directly on an induction cooker, which is an improvement compared to previous cooking utensils.

[0042] In step S2, the initial firing temperature of the carbon-ceramic blank is controlled at ±1400°C. Graphitization can occur at ±1400°C to improve the electrical conductivity, thermal conductivity and corrosion resistance of the blank. The sintering time is controlled within 30 - 35h.

[0043] In the present application, graphitization is a process of generating graphite. In fact, that is, after reaching 1400°C, the crystal grains in the carbon-ceramic blank material start to grow, and the structure gradually transforms into graphite crystals. It continues for a period of time at the heating temperature to make the crystal grains grow further and be distributed as evenly as possible in the material to achieve the final effect of the carbon-ceramic blank having graphitization. As the material is slowly cooled in the later stage, the crystal grains become more stable, thus making the graphitization effect of the carbon-ceramic blank better.

[0044] Graphitization of the carbon-ceramic blank can improve the bulk density, electrical conductivity, thermal conductivity, corrosion resistance and machining properties of the carbon-ceramic blank product.

[0045] In step S4, the final temperature of the second firing of the blank coated with the carbon-ceramic composite layer is controlled at 1300°C - 1330°C, and the sintering time is controlled within ±15h. After the first firing of the carbon-ceramic blank in the present application, there will be fine particles or pits on the surface, and later using ceramic glaze usually cannot directly make it smooth and flat. Therefore, the present application uses a carbon-ceramic composite layer to repair the above defects.

[0046] In step S6, the final temperature of the third firing after glazing is controlled at 1200°C - 1250°C, and the sintering time is controlled within 8 - 9h.

[0047] In step S1, the components of the carbon-ceramic green body material are as follows by weight: 10 parts of potassium feldspar, 5.5 parts of sodium feldspar, 10 parts of light calcium carbonate, 15 parts of Yixing barium carbonate, 10 parts of Longyan kaolin, 20 parts of red firing block, 10 parts of calcined kaolin, 10 parts of talc, and 30 parts of light glaze powder.

[0048] The specific components are organized into the following table.

[0049] Raw material Quantity Potassium feldspar 10 Albite 5.5 Light calcium carbonate 10 Yixing barium carbonate 15 Longyan kaolin 10 Light glaze powder 30 Red large firing block 20 Calcined kaolin 10 Talc 10

[0050] In step S1, the die-casting forming of the carbon-ceramic green body is further subdivided into the following steps:

[0051] A. Powder preparation: The raw materials used for the ceramic green body need to be prepared into the required ceramic powder through crushing and mixing processes.

[0052] B. Mold design: Design the mold according to the shape and size requirements of the product, and put a predetermined amount of ceramic powder into the mold.

[0053] C. Forming: Put the mold into a hot press, heat it to a certain temperature and apply a certain pressure to hot-press the ceramic powder into shape. During the forming process, it is necessary to control the heating temperature and maintain a certain pressure holding time to ensure the full sintering and solidification of the ceramic powder.

[0054] It should be noted that the die-casting forming of the carbon-ceramic green body has many advantages. First, due to the application of a certain pressure during the hot-pressing forming process, a dense bond is formed between the ceramic powder particles, so that the formed ceramic product has a higher density and better strength. Second, the hot-pressing forming can be completed in a shorter time, and the production efficiency is higher. At the same time, due to the sintering of the ceramic powder during the heating process, the formed product has a higher dimensional accuracy and can meet the production requirements of products with higher shape and size requirements. In addition, the ceramic hot-die-casting forming method can also prepare ceramic products with complex shapes and has good design freedom.

[0055] In sub-step C of step S1, the pressure for hot-pressing forming is 55 - 65 KN, and the pressure holding time is 3 s.

[0056] In step S3, the raw materials in the carbon-ceramic composite layer are fully stirred and mixed at 110 - 130 °C.

[0057] In step S3, the raw materials in the carbon-ceramic composite layer are ball-milled with water for 24 h during the preparation process. Among them, the ball-milled carbon-ceramic composite layer is sprayed onto the outer surface of the carbon-ceramic green body by a spray gun heated to 180 - 220 °C, with a thickness of 50 μm, and then dried at a high temperature of 200 - 250 °C for 30 - 60 s, and then naturally cooled to room temperature.

[0058] In step S5, a colored or transparent ceramic glaze is sprayed on the semi-finished carbon ceramic blank by a spraying method. After standing for 55 - 65 minutes, it is placed in an anaerobic sintering furnace. Specifically, the ceramic glaze is formed by spraying with a spray gun heated to 180 - 220 °C on the surface of the base layer, with a thickness between 30 - 60 μm. Then it is dried at a high temperature of 200 - 250 °C for 60 - 90 s, and then naturally cooled to room temperature.

[0059] In each firing process of this application, it is necessary to load the ceramic products into the sagger. The sagger is a container for baking ceramic products, made of refractory materials, and its function is to prevent the ceramic blank from direct contact with the kiln fire and avoid pollution, which is especially beneficial for the firing of white porcelain.

[0060] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly illustrating this application, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of this application.

Claims

1. A cooking utensil combining bamboo charcoal and graphite with ceramic glaze, characterized in that, It includes the following steps: S1. Die-casting and forming the carbon-ceramic blank; S2. Preliminary firing of the blank, and the carbon-ceramic blank is fired at a high temperature until graphitization; S3. Coating the carbon-ceramic composite layer, and the raw materials in the carbon-ceramic composite layer are evenly coated on the surface of the blank after stirring and ball-milling processes; S4. Vacuum negative pressure immersion, putting the carbon-ceramic composite cooking utensil into a vacuum negative pressure tank, and taking it out after soaking in a silicon-aluminum nano-solvent for 1 hour; S5. Secondary firing, putting the blank coated with the composite layer into an anaerobic sintering furnace for secondary firing, taking it out after firing at a certain temperature, and cooling it to room temperature; S6. Glazing, evenly coating the glaze on the outer surface of the semi-finished product after secondary firing; S7. Tertiary firing, putting the glazed carbon-ceramic semi-finished product into an anaerobic sintering furnace for tertiary firing, taking it out after firing at a certain temperature, and cooling it to room temperature to obtain the carbon-ceramic composite cooking utensil.

2. The cooking utensil combining bamboo charcoal and graphite with ceramic glaze as claimed in claim 1, wherein In the step S2, the temperature of the preliminary firing of the carbon-ceramic blank is controlled at ±1400 °C, and it can be graphitized at ±1400 °C to improve the electrical and thermal conductivity and corrosion resistance of the blank, and the sintering time is controlled within 30 - 35 h.

3. The cooking utensil combining bamboo charcoal and graphite with ceramic glaze as claimed in claim 1, wherein, In the step S4, the final temperature of the secondary firing of the blank coated with the composite layer is controlled at 1300 °C - 1330 °C, and the sintering time is controlled within ±15 h.

4. The cooking utensil combining bamboo charcoal and graphite with ceramic glaze as claimed in claim 1, wherein, In the step S6, the final temperature of the tertiary firing after glazing is controlled at 1200 °C - 1250 °C, and the sintering time is controlled within 8 - 9 h.

5. The cooking utensil combining bamboo charcoal and graphite with ceramic glaze as claimed in claim 1, wherein In terms of weight parts, the component of the carbon-ceramic blank material in the step S1 is specifically: 10 parts of potassium feldspar, 5.5 parts of sodium feldspar, 10 parts of light calcium carbonate, 15 parts of Yixing barium carbonate, 10 parts of Longyan kaolin, 20 parts of red firing block, 10 parts of calcined kaolin, 10 parts of talc and 30 parts of light glaze powder.

6. The cooking utensil combining bamboo charcoal and graphite with ceramic glaze as claimed in claim 1, characterized in that, In the step S1, the die-casting and forming of the carbon-ceramic blank is specifically further divided into the following steps: A. Powder preparation, the raw materials used for the ceramic blank need to be prepared into the required ceramic powder through crushing and mixing processes; B. Mold design, designing the mold according to the shape and size requirements of the product, and putting a predetermined amount of ceramic powder into the mold; C. Forming, putting the mold into a hot press, heating to a certain temperature and applying a certain pressure to hot-press and form the ceramic powder. During the forming process, it is necessary to control the heating temperature and maintain a certain pressure holding time to ensure the full sintering and curing of the ceramic powder.

7. The cooking utensil combining bamboo charcoal and graphite with ceramic glaze as claimed in claim 6, wherein In the sub-step C of the step S1, the pressure for hot-press forming is 55 - 65 KN, and the pressure holding time is 3 s.

8. The cooking utensil combining bamboo charcoal and graphite with ceramic glaze as claimed in claim 1, wherein In the step S3, the raw materials in the carbon-ceramic composite layer are fully stirred and mixed at 110 - 130 °C.

9. The cooking utensil combining bamboo charcoal and graphite with ceramic glaze according to claim 8, characterized in that, In the step S3, the raw materials in the carbon-ceramic composite layer are ball-milled with water for 48 h during the preparation process. The ball-milled carbon-ceramic composite layer is sprayed onto the outer surface of the carbon-ceramic blank by a spray gun heated to 180 - 220 °C, with a thickness of 50 μm, and then dried at 200 - 250 °C at a high temperature for 30 - 60 s, and then naturally cooled to room temperature.

10. The cooking utensil combining bamboo charcoal and graphite with ceramic glaze as claimed in claim 1, wherein, In the step S5, spray the colored or transparent ceramic glaze water on the semi-finished carbon-ceramic blank by spraying method, let it stand for 55 - 65 min and then put it into an anaerobic sintering furnace.

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