Preparation process of high heat-resistant ceramic with non-stick glaze

Abstract

A preparation process for a high-heat-resistant ceramic with a non-stick glaze, the high-heat-resistant ceramic comprising a green body and a non-stick glaze, the non-stick glaze comprising the following raw materials: spodumene, talc, albite, quartz, zinc oxide, kaolin, titanium oxide, and cerium oxide; the preparation process comprising the following steps: placing the green body coated with glaze slurry into a kiln for firing and forming, then cooling to 900-940°C, holding the temperature for 2.5-3.5 hours, then cooling to 420-480°C, and transferring the green body to a potassium nitrate solution for soaking for 50-70 minutes; finally, removing the soaked ceramic green body, naturally cooling it to room temperature, and washing it with 50-70°C hot water to obtain the high-heat-resistant ceramic. By limiting the raw material composition of the non-stick glaze and specifying the preparation process, the present application enables the prepared ceramic glaze to have a water-resistant effect, and can be used in cookware such as ceramic home appliance inner pots, woks, frying pans, and baking trays, and has broad market prospects.

Description

Technical Field

[0001] The invention belongs to the field of ceramic preparation, and in particular relates to a preparation process of high-heat-resistant ceramic with a non-stick glaze surface. Background Art

[0002] Ceramic glaze is a thin, colorless or colored, glassy layer that covers the surface of ceramic products. It's made by mixing mineral and chemical raw materials in a specific ratio, finely grinding them into a glaze slurry, then applying it to the ceramic body and calcining it. Ceramic glazes primarily serve as stain protection and decorative materials, imparting a soft and elegant or a smooth, crystal-clear texture to the surface. Combined with innovative design, they imbue ceramics with culture, spirit, and life, imbuing them with a sense of life.

[0003] Non-stick glaze porcelain refers to a ceramic material that can spontaneously remove pollutants in the external natural environment (solar energy, rain, wind, etc.) without the need for strong external scrubbing or the use of chemical agents such as detergents, relying solely on the physical or chemical properties of the ceramic surface itself.

[0004] So far, all ceramic non-stick glazes on the market are coatings, most of which are Teflon (polytetrafluoroethylene). When the temperature exceeds 300°C, it will decompose and release harmful substances. It is unsafe to use it as barbecue cooking utensils; further improvement is needed. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a preparation process for high-heat-resistant ceramics with a non-stick glaze surface.

[0006] The present invention adopts the following technical solutions:

[0007] A preparation process for a high-heat-resistant ceramic with a non-stick glaze, the high-heat-resistant ceramic comprising a green body and a non-stick glaze, the non-stick glaze comprising the following raw materials in parts by weight: 55-60 parts of spodumene, 10-15 parts of talc, 5-10 parts of albite, 5-10 parts of quartz, 3-5 parts of zinc oxide, 3-5 parts of kaolin, 0.5-1 part of titanium oxide, and 1-2 parts of cerium oxide;

[0008] The preparation process specifically comprises the following steps:

[0009] Step 1: weighing ingredients according to the non-stick glaze formula, crushing, mixing, and wet ball milling the raw materials to prepare a glaze slurry;

[0010] Step 2: applying the glaze slurry prepared in step 1 to the surface of the prepared ceramic body, placing the glaze slurry in a kiln after drying, firing at 1320-1360° C., then cooling to 900-940° C., holding for 2.5-3.5 hours, then cooling to 420-480° C., and transferring to a potassium nitrate solution at 435-460° C. and soaking for 50-70 minutes to perform glaze ion exchange;

[0011] Step 3: Take out the soaked ceramic body, cool it naturally to room temperature, and then wash it with hot water at 50-70° C. to obtain the high-heat-resistant ceramic with a non-stick glaze surface.

[0012] Furthermore, the potassium nitrate content of the potassium nitrate solution is greater than 99%.

[0013] Furthermore, the preparation method of the potassium nitrate melt is as follows: placing potassium nitrate solid in a container, heating it to 435-460° C. to make it into a molten state, and obtaining the potassium nitrate melt.

[0014] Furthermore, the green body comprises the following raw materials in parts by weight: 20-30 parts of diopside, 15-18 parts of albite, 10-15 parts of kaolin, 18-25 parts of quartz, 5-8 parts of magnesium oxide, 3-5 parts of brucite, 6-10 parts of calcite, 2-3 parts of aluminum oxide, and 3-5 parts of calcium oxide.

[0015] Furthermore, the steps for preparing the green body are as follows:

[0016] A. Weigh the ingredients according to the green body formula, crush, sieve, mix and wet-mill the raw materials to obtain green body slurry;

[0017] B. Make the green body into ceramic green body, then send it into the kiln and bisque-fire it at 920-950℃ for 3-4h to form the ceramic green body.

[0018] Furthermore, during wet ball milling of the slurry, the raw materials are wet ground in a ball mill for 24-28 hours, the grinding matrix is water, and the raw material: ball: water = 1:1.2-1.5:1.5-1.8.

[0019] Furthermore, in step 2, the firing of the glaze slurry and the green body is controlled as follows:

[0020] Low temperature stage: the temperature in the kiln rises from room temperature to 420-450℃, and the firing time is 30-40 minutes;

[0021] Decomposition and oxidation stage: the temperature in the kiln is raised to 920-960°C and the firing time is 2-3 hours;

[0022] High temperature firing stage: The temperature in the kiln is controlled at 1320-1360℃, and the firing time is 5-6 hours.

[0023] Furthermore, during the high-temperature firing stage, the concentration of carbon monoxide in the kiln is 2.8-3.2%, and the concentration of free oxygen is 1.6-1.8%.

[0024] Furthermore, in step 1, when the glaze slurry is wet ball milled, the raw materials are wet ground in a ball mill for 32-36 hours, the grinding matrix is water, and the raw material: ball: water = 1:1.5-1.8:1.8-2.

[0025] Furthermore, in step 2, the glaze slurry is applied to the surface of the body by dipping.

[0026] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention defines the raw material composition of the non-stick glaze and a specific preparation process, so that the prepared ceramic glaze has a water-resistant effect, which can be used for cooking utensils such as ceramic home appliance inner pots, woks, frying pans, baking trays, etc., and has broad market prospects; wherein, the fired ceramic is kept at a certain temperature and then immersed in a potassium nitrate solution, and the K in the solution is + It is more active at a certain temperature and can exchange Li on the glaze surface. + and Na + , K + The radius is larger than Li + and Na + , K + Large ions "crowd" into the original locations of small Li+ and Na+ ions, making the glaze surface denser. SEM observations show that nipples with a composite structure of micron and nanometer scales are formed on the glaze surface. Water does not spread to other directions on these nanometer-scale tiny particles on the glaze surface, making the glaze surface non-wettable, creating a water-resistant lotus leaf effect.

[0028] Specifically control the firing process of ceramics. After firing, the ceramics are cooled to 900-940℃ and kept warm for 2.5-3.5 hours to purify the glaze surface and precipitate tiny crystals, thereby reducing the expansion coefficient of the glaze surface and controlling the expansion coefficient of the glaze surface to 1.0*10 -6 -1.3*10 -6 , slightly smaller than the body, resulting in a good bond between the body and glaze, and can improve the strength of the ceramic. Among them, the introduction of titanium oxide and cerium oxide into the glaze in combination with other raw materials enables tiny crystals to quickly precipitate on the glaze surface when the fired ceramic is cooled to 900-940℃;

[0029] Specifically define the raw material composition and biscuit firing process of the green body, so that the expansion coefficient of the green body after biscuit firing is controlled within 1.8*10 -6 -2.1*10 -6 , slightly larger than the non-stick glaze, resulting in a good combination of body and glaze, thereby ensuring that the prepared ceramic glaze surface is smooth and crack-free, greatly improving the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a SEM electron microscope scan of the high heat-resistant ceramic prepared in Example 3;

[0031] Figure 2 This is a SEM electron microscope scan of the high heat-resistant ceramic prepared in Comparative Example 1;

[0032] Figure 3 This is a diagram showing the results of a water-wetting experiment on the high-heat-resistant ceramic prepared in Example 3;

[0033] Figure 4 This is a diagram showing the results of the water-wetting experiment on the high-heat-resistant ceramic prepared in Comparative Example 1. DETAILED DESCRIPTION

[0034] The present invention is further described below through specific embodiments.

[0035] The invention discloses a high heat-resistant ceramic with a non-stick glaze surface, comprising a body and a non-stick glaze.

[0036] The green body comprises the following raw materials in parts by weight: 20-30 parts of diopside, 15-18 parts of albite, 10-15 parts of kaolin, 18-25 parts of quartz, 5-8 parts of magnesium oxide, 3-5 parts of brucite, 6-10 parts of calcite, 2-3 parts of aluminum oxide, and 3-5 parts of calcium oxide.

[0037] The non-stick glaze comprises the following raw materials in parts by weight: 55-60 parts of spodumene, 10-15 parts of talc, 5-10 parts of albite, 5-10 parts of quartz, 3-5 parts of zinc oxide, 3-5 parts of kaolin, 0.5-1 part of titanium oxide, and 1-2 parts of cerium oxide.

[0038] The preparation process specifically comprises the following steps:

[0039] Step 1: Prepare ceramic body:

[0040] A. Weigh the ingredients according to the green body formula, crush, sieve, mix and wet-mill the raw materials to obtain green body slurry;

[0041] B. Make the green body into a ceramic green body, then send it into the kiln and bisque-fire it at 920-950℃ for 3-4h to form a ceramic green body;

[0042] Step 2: weighing ingredients according to the non-stick glaze formula, crushing, mixing, and wet-ball milling the raw materials to prepare a glaze slurry;

[0043] Step 3: applying the glaze slurry prepared in step 1 to the surface of the prepared ceramic body by dipping, placing the glaze slurry in a kiln after drying, firing at 1320-1360° C., then cooling to 900-940° C., holding for 2.5-3.5 hours, then cooling to 420-480° C., and transferring to a potassium nitrate solution at 435-460° C. and soaking for 50-70 minutes to perform glaze ion exchange;

[0044] Step 4: Take out the soaked ceramic body, cool it naturally to room temperature, and then wash it with hot water at 50-70° C. to obtain the high-heat-resistant ceramic with a non-stick glaze surface.

[0045] Among them, when the green slurry is wet ball milled, the raw materials are wet ground in a ball mill for 24-28 hours, the grinding matrix is water, and the raw material: ball: water = 1:1.2-1.5:1.5-1.8.

[0046] During wet ball milling of the glaze slurry, the raw materials are wet ground in a ball mill for 32-36 hours, the grinding matrix is water, and the raw material: ball: water = 1:1.5-1.8:1.8-2.

[0047] The firing control of glaze slurry and green body is as follows:

[0048] Low temperature stage: the temperature in the kiln rises from room temperature to 420-450℃, and the firing time is 30-40 minutes;

[0049] Decomposition and oxidation stage: the temperature in the kiln is raised to 920-960°C and the firing time is 2-3 hours;

[0050] High temperature firing stage: The temperature in the kiln is controlled at 1320-1360℃, and the firing time is 5-6 hours.

[0051] Specifically, during the high-temperature firing stage, the concentration of carbon monoxide in the kiln is 2.8-3.2%, and the concentration of free oxygen is 1.6-1.8%.

[0052] The potassium nitrate melt has a potassium nitrate content of more than 99%, and its preparation method is as follows: placing potassium nitrate solid in a container, heating it to 435-460° C. to make it into a molten state, and thus obtaining the potassium nitrate melt.

[0053] Example 1

[0054] The invention discloses a high heat-resistant ceramic with a non-stick glaze surface, comprising a body and a non-stick glaze.

[0055] The green body comprises the following raw materials in parts by weight: 20 parts of diopside, 18 parts of albite, 10 parts of kaolin, 25 parts of quartz, 5 parts of magnesium oxide, 5 parts of brucite, 6 parts of calcite, 3 parts of aluminum oxide, and 3 parts of calcium oxide.

[0056] The non-stick glaze comprises the following raw materials in parts by weight: 55 parts of spodumene, 15 parts of talc, 5 parts of albite, 5 parts of quartz, 5 parts of zinc oxide, 3 parts of kaolin, 1 part of titanium oxide, and 2 parts of cerium oxide.

[0057] The preparation process specifically comprises the following steps:

[0058] Step 1: Prepare ceramic body:

[0059] A. Weigh the ingredients according to the green body formula, crush, sieve, mix and wet-mill the raw materials to obtain green body slurry;

[0060] B. Make the green body into a ceramic green body, then send it into the kiln and bisque-fire it at 920℃ for 4 hours to form a ceramic green body;

[0061] Step 2: weighing ingredients according to the non-stick glaze formula, crushing, mixing, and wet-ball milling the raw materials to prepare a glaze slurry;

[0062] Step 3: Apply the glaze slurry prepared in step 1 to the surface of the prepared ceramic body by dipping. After the glaze slurry is dried, place it in a kiln and sinter it at 1320°C. Then cool it to 900°C and keep it at this temperature for 3.5 hours. Then cool it to 420°C and transfer it to a potassium nitrate solution at 435°C and soak it for 70 minutes to perform glaze ion exchange.

[0063] Step 4: Take out the soaked ceramic body, cool it naturally to room temperature, and then wash it with hot water at 50° C. to obtain the high-heat-resistant ceramic with a non-stick glaze surface.

[0064] Among them, when the green slurry is wet ball milled, the raw materials are wet ground in a ball mill for 24 hours, the grinding matrix is water, and the raw material: ball: water = 1:1.5:1.5.

[0065] During wet ball milling of the glaze slurry, the raw materials were wet ground in a ball mill for 32 hours. The grinding matrix was water, and the raw material: ball: water = 1:1.8:2.

[0066] The firing control of glaze slurry and green body is as follows:

[0067] Low temperature stage: the temperature in the kiln rises from room temperature to 420℃, and the firing time is 40 minutes;

[0068] Decomposition and oxidation stage: the temperature in the kiln is raised to 920°C and the firing time is 3 hours;

[0069] High temperature firing stage: The temperature in the kiln is controlled at 1320℃ and the firing time is 6 hours.

[0070] Specifically, during the high-temperature firing stage, the concentration of carbon monoxide in the kiln was 2.8% and the concentration of free oxygen was 1.8%.

[0071] The potassium nitrate melt has a potassium nitrate content of more than 99%, and its preparation method is as follows: placing potassium nitrate solid in a container, heating it to 435° C. to make it into a molten state, and thus obtaining the potassium nitrate melt.

[0072] The high heat-resistant ceramics prepared in Example 1 were subjected to corresponding tests, wherein the water absorption rate was less than 0.5%, the green body expansion coefficient was 1.8*10 -6 , the glaze expansion coefficient is 1.3*10 -6 , the flexural strength is 128MPa.

[0073] Example 2

[0074] The invention discloses a high heat-resistant ceramic with a non-stick glaze surface, comprising a body and a non-stick glaze.

[0075] The green body comprises the following raw materials in parts by weight: 30 parts of diopside, 15 parts of albite, 15 parts of kaolin, 18 parts of quartz, 8 parts of magnesium oxide, 3 parts of brucite, 10 parts of calcite, 2 parts of aluminum oxide, and 5 parts of calcium oxide.

[0076] The non-stick glaze comprises the following raw materials in parts by weight: 60 parts of spodumene, 10 parts of talc, 10 parts of albite, 5 parts of quartz, 3 parts of zinc oxide, 5 parts of kaolin, 0.5 parts of titanium oxide, and 1 part of cerium oxide.

[0077] The preparation process specifically comprises the following steps:

[0078] Step 1: Prepare ceramic body:

[0079] A. Weigh the ingredients according to the green body formula, crush, sieve, mix and wet-mill the raw materials to obtain green body slurry;

[0080] B. Make the green body into a ceramic green body, then put it into the kiln and bisque-fire it at 950℃ for 3 hours to form a ceramic green body;

[0081] Step 2: weighing ingredients according to the non-stick glaze formula, crushing, mixing, and wet-ball milling the raw materials to prepare a glaze slurry;

[0082] Step 3: Apply the glaze slurry prepared in step 1 to the surface of the prepared ceramic body by dipping. After the glaze slurry is dried, place it in a kiln and sinter it at 1360°C. Then cool it to 940°C and keep it at this temperature for 2.5 hours. Then cool it to 480°C and transfer it to a potassium nitrate solution at 460°C and soak it for 50 minutes to perform glaze ion exchange.

[0083] Step 4: Take out the soaked ceramic body, cool it naturally to room temperature, and then wash it with hot water at 70° C. to obtain the high-heat-resistant ceramic with a non-stick glaze surface.

[0084] Among them, when the green slurry is wet ball milled, the raw materials are wet ground in a ball mill for 28 hours, the grinding matrix is water, and the raw material: ball: water = 1:1.2:1.8.

[0085] During wet ball milling of the glaze slurry, the raw materials were wet ground in a ball mill for 36 hours. The grinding matrix was water, and the raw material: ball: water = 1:1.5:1.8.

[0086] The firing control of glaze slurry and green body is as follows:

[0087] Low temperature stage: the temperature in the kiln rises from room temperature to 450℃, and the firing time is 30 minutes;

[0088] Decomposition and oxidation stage: the temperature in the kiln is raised to 960°C and the kiln firing time is 2 hours;

[0089] High temperature firing stage: The temperature in the kiln is controlled at 1360℃ and the firing time is 6 hours.

[0090] Specifically, during the high-temperature firing stage, the concentration of carbon monoxide in the kiln was 3.2% and the concentration of free oxygen was 1.6%.

[0091] The potassium nitrate melt has a potassium nitrate content of more than 99%, and its preparation method is as follows: placing potassium nitrate solid in a container, heating it to 460° C. to make it into a molten state, and thus obtaining the potassium nitrate melt.

[0092] The high heat-resistant ceramics prepared in Example 2 were subjected to corresponding tests, wherein the water absorption rate was less than 0.5%, the green body expansion coefficient was 2.1*10 -6 , the glaze expansion coefficient is 1.0*10 -6 , the flexural strength is 126MPa.

[0093] Example 3

[0094] The invention discloses a high heat-resistant ceramic with a non-stick glaze surface, comprising a body and a non-stick glaze.

[0095] The green body comprises the following raw materials in parts by weight: 25 parts of diopside, 10 parts of albite, 12 parts of kaolin, 22 parts of quartz, 6 parts of magnesium oxide, 4 parts of brucite, 8 parts of calcite, 2.5 parts of aluminum oxide, and 4 parts of calcium oxide.

[0096] The non-stick glaze comprises the following raw materials in parts by weight: 58 parts of spodumene, 12 parts of talc, 8 parts of albite, 7 parts of quartz, 4 parts of zinc oxide, 4 parts of kaolin, 0.7 parts of titanium oxide, and 1.5 parts of cerium oxide.

[0097] The preparation process specifically comprises the following steps:

[0098] Step 1: Prepare ceramic body:

[0099] A. Weigh the ingredients according to the green body formula, crush, sieve, mix and wet-mill the raw materials to obtain green body slurry;

[0100] B. Make the green body into a ceramic green body, then put it into the kiln and bisque-fire it at 935℃ for 3.5h to form a ceramic green body;

[0101] Step 2: weighing ingredients according to the non-stick glaze formula, crushing, mixing, and wet-ball milling the raw materials to prepare a glaze slurry;

[0102] Step 3: Apply the glaze slurry prepared in step 1 to the surface of the prepared ceramic body by dipping. After the glaze slurry is dried, place it in a kiln and sinter it at 1350°C. Then cool it to 920°C and keep it at that temperature for 3 hours. Then cool it to 450°C and transfer it to a potassium nitrate solution at 450°C for immersion for 60 minutes to perform glaze ion exchange.

[0103] Step 4: Take out the soaked ceramic body, cool it naturally to room temperature, and then wash it with hot water at 60° C. to obtain the high-heat-resistant ceramic with a non-stick glaze surface.

[0104] Among them, when the green slurry is wet ball milled, the raw materials are wet ground in a ball mill for 26 hours, the grinding matrix is water, and the raw material: ball: water = 1:1.3:1.6.

[0105] During wet ball milling of the glaze slurry, the raw materials were wet ground in a ball mill for 34 hours. The grinding matrix was water, and the raw material: ball: water = 1:1.6:1.9.

[0106] The firing control of glaze slurry and green body is as follows:

[0107] Low temperature stage: the temperature in the kiln rises from room temperature to 435°C, and the firing time is 35 minutes;

[0108] Decomposition and oxidation stage: the temperature in the kiln is raised to 940°C and the kiln firing time is 2.5 hours;

[0109] High-temperature firing stage: The temperature in the kiln is controlled at 1350°C and the firing time is 5.5 hours.

[0110] Specifically, during the high-temperature firing stage, the concentration of carbon monoxide in the kiln was 3.0% and the concentration of free oxygen was 1.7%.

[0111] The high heat-resistant ceramics prepared in Example 3 were subjected to corresponding tests, wherein the water absorption rate was less than 0.5%, the green body expansion coefficient was 2.0*10 -6 , the glaze expansion coefficient is 1.1*10 -6 , the flexural strength is 132MPa.

[0112] The potassium nitrate melt has a potassium nitrate content of more than 99%, and its preparation method is as follows: placing potassium nitrate solid in a container, heating it to 450° C. to make it into a molten state, and thus obtaining the potassium nitrate melt.

[0113] Comparative Example 1

[0114] The raw material composition and preparation method are basically the same as those in Example 3, except that:

[0115] The preparation process specifically comprises the following steps:

[0116] Step 1: Prepare ceramic body:

[0117] A. Weigh the ingredients according to the green body formula, crush, sieve, mix and wet-mill the raw materials to obtain green body slurry;

[0118] B. Make the green body into a ceramic green body, then put it into the kiln and bisque-fire it at 935℃ for 3.5h to form a ceramic green body;

[0119] Step 2: weighing ingredients according to the non-stick glaze formula, crushing, mixing, and wet-ball milling the raw materials to prepare a glaze slurry;

[0120] Step 3: Apply the glaze slurry prepared in step 1 on the surface of the prepared ceramic body by dipping. After the glaze slurry is dried, put it into a kiln and fire it at 1350°C. Then cool it to 920°C and keep it warm for 3 hours. Then naturally cool it to room temperature to obtain the high-heat-resistant ceramic with a non-stick glaze surface.

[0121] The high heat-resistant ceramics prepared in Example 3 and the high heat-resistant ceramics prepared in Comparative Example 1 were subjected to glaze micromorphology analysis and water-wetting test. The specific results are shown in Table 1. Figure 1 、 Figure 2 、 Figure 3 and Figure 4 ,pass Figure 1 and Figure 3 It can be seen that the surface of the high heat-resistant ceramic glaze prepared in Example 3 produces nipples of micron and nanometer composite structure. Water will not spread to other directions on the glaze surface on these nanometer-scale tiny particles, so that the glaze surface is not wetted by water, and a water-resistant lotus leaf effect is produced. Figure 2 and Figure 4 It can be seen that the surface of the high-heat-resistant ceramic glaze prepared in Comparative Example 1 does not produce nipples of micron- and nano-scale composite structures, so its glaze surface will be wetted by water and does not have a water-resistant effect.

[0122] In summary, the present application defines the raw material composition of the non-stick glaze and a specific preparation process, so that the prepared ceramic glaze has a water-resistant effect, which can be used for cooking utensils such as ceramic home appliance inner pots, woks, frying pans, baking trays, etc., and has broad market prospects; wherein, the fired ceramic is kept at a certain temperature and then immersed in a potassium nitrate solution, and the K in the solution + It is more active at a certain temperature and can exchange Li on the glaze surface. + and Na + , K + The radius is larger than Li + and Na + , K + The large ions "crowd" into the original positions of the small Li+ and Na+ ions, making the glaze surface denser. SEM observations show that nipples with micron and nano-scale composite structures are produced on the glaze surface. Water will not spread to other directions on the glaze surface on these nano-scale tiny particles, so that the glaze surface is not wetted by water, resulting in a water-resistant lotus leaf effect.

[0123] The above description is merely a preferred embodiment of the present invention and therefore cannot be used to limit the scope of the present invention. In other words, equivalent changes and modifications made according to the scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A process for preparing non-stick glaze high heat-resistant ceramics, characterized by: The high heat-resistant ceramic comprises a green body and a non-stick glaze, wherein the non-stick glaze comprises the following raw materials in parts by weight: 55-60 parts of spodumene, 10-15 parts of talc, 5-10 parts of albite, 5-10 parts of quartz, 3-5 parts of zinc oxide, 3-5 parts of kaolin, 0.5-1 part of titanium oxide, and 1-2 parts of cerium oxide; The preparation process specifically includes the following steps: Step 1, weighing ingredients according to the non-stick glaze formula, crushing, mixing, and wet ball milling the raw materials to prepare a glaze slurry; Step 2: applying the glaze slurry prepared in step 1 to the surface of the prepared ceramic body, placing the glaze slurry in a kiln after drying, firing at 1320-1360° C., then cooling to 900-940° C., holding for 2.5-3.5 hours, then cooling to 420-480° C., and transferring to a potassium nitrate solution at 435-460° C. and soaking for 50-70 minutes to perform glaze ion exchange; Step 3, taking out the soaked ceramic body, cooling it naturally to room temperature, and then washing it with hot water at 50-70° C. to obtain the high-heat-resistant ceramic with a non-stick glaze surface; The potassium nitrate content of the potassium nitrate solution is greater than 99%; The preparation method of the potassium nitrate melt is as follows: placing potassium nitrate solid in a container and heating it to 435-460° C. to melt it to obtain the potassium nitrate melt; In step 2, the firing of the glaze slurry and the green body is controlled as follows: Low temperature stage: the kiln temperature rises from room temperature to 420-450℃, and the kiln firing time is 30-40 minutes; decomposition and oxidation stage: the kiln temperature rises to 920-960℃, and the kiln firing time is 2-3 hours; High temperature firing stage: the temperature in the kiln is controlled at 1320-1360℃, and the firing time is 5-6 hours; During the high-temperature firing stage, the concentration of carbon monoxide in the kiln is 2.8-3.2%, and the concentration of free oxygen is 1.6-1.8%; In step 1, when the glaze slurry is wet ball milled, the raw materials are wet ground in a ball mill for 32-36 hours, the grinding matrix is water, and the raw material: ball: water = 1:1.5-1.8:1.8-2.

2. The process for preparing a non-stick glaze high heat-resistant ceramic according to claim 1, characterized in that: The green body comprises the following raw materials in parts by weight: 20-30 parts of diopside, 15-18 parts of albite, 10-15 parts of kaolin, 18-25 parts of quartz, 5-8 parts of magnesium oxide, 3-5 parts of brucite, 6-10 parts of calcite, 2-3 parts of aluminum oxide, and 3-5 parts of calcium oxide.

3. The process for preparing a non-stick glaze high heat-resistant ceramic according to claim 2, characterized in that: The steps for preparing the green body are as follows: A. Weigh the ingredients according to the green body formula, crush, sieve, mix and wet-mill the raw materials to obtain green body slurry; B. Make the green body into a ceramic green body, then send it into a kiln and bisque-fire it at 920-950℃ for 3-4 hours to obtain a ceramic green body.

4. The process for preparing a non-stick glaze high heat-resistant ceramic according to claim 1, characterized in that: During wet ball milling of the green slurry, the raw materials are wet ground in a ball mill for 24-28 hours. The grinding matrix is water, and the ratio of raw materials: balls: water is 1:1.2-1.5:1.5-1.

8.

5. The process for preparing a non-stick glaze high heat-resistant ceramic according to claim 1, characterized in that: In step 2, the glaze slurry is applied to the surface of the green body by dipping.

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