Formula of high-temperature hard glaze for bone china and bone china production process

Abstract

The invention relates to the technical field of ceramic production, and discloses a high-temperature hard glaze formula for bone china and a bone china production process. 4%-6% of aluminum oxide; 2%-5% of boron oxide; 3%-7% of zinc oxide; 3%-10% of an alkaline earth metal oxide; 7%-13% of alkali metal oxide; 0.5%-2% of zirconium oxide; and 0.5%-1.5% of titanium dioxide. According to the high-temperature hard glaze formula for the bone china and the bone china production process, a proper amount of boric oxide, zinc oxide and lithium oxide are added into the glaze, so that the thermal expansion coefficient of the glaze is effectively reduced, and the thermal stability of the bone china is improved; by adding aluminum oxide, the breaking strength of the bone china can be greatly improved; by adopting a lead-free formula, lead pollution is avoided, and the environment-friendly requirement is met; through the optimized glaze formula and process, the bone china surface has good glossiness and smoothness.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic production, in particular to a high-temperature hard glaze formula for bone china and a bone china production process. Background Art

[0002] Bone china is a high-end ceramic product. It is widely used in tableware, tea sets, handicrafts and other fields due to its fine texture, soft luster, high strength and good thermal insulation performance. There are some problems in the traditional bone china production process and glaze formula, which limits the further improvement of bone china performance and the satisfaction of environmental protection requirements.

[0003] The glaze formula of traditional bone china usually contains a high lead content. Although lead can improve the gloss and fluidity of the glaze, it is a heavy metal that poses potential hazards to human health and the environment. With the continuous improvement of environmental awareness, the development of lead-free bone china glaze formula has become an inevitable trend in the development of the industry. In addition, the thermal stability of traditional bone china is poor, and it is prone to cracking in an environment with large temperature changes, which affects its service life and aesthetics. At the same time, the flexural strength of bone china needs to be improved to meet higher usage requirements.

[0004] In terms of production technology, traditional glazing devices mostly use external clamping to fix the bone china blanks. This method makes it impossible to glaze the clamped parts, and subsequent glazing operations are required, which increases the production process and costs. In addition, for some bone china blanks with too small bottle mouths, traditional clamping methods are difficult to achieve effective clamping, which limits its application on bone china blanks of different shapes.

[0005] In summary, the existing bone china production process and glaze formula have deficiencies in environmental protection, thermal stability, flexural strength and glaze dipping effect, and cannot meet the market demand for high-quality, environmentally friendly bone china products. Therefore, developing a new high-temperature hard glaze formula and production process for bone china to solve the above problems has important practical significance and broad application prospects. Summary of the invention

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies in the prior art, the present invention provides a high-temperature hard glaze formula for bone china and a bone china production process. By adding appropriate amounts of boron oxide, zinc oxide and lithium oxide to the glaze, the thermal expansion coefficient of the glaze is effectively reduced, and the thermal stability of the bone china is improved; by adding aluminum oxide, the flexural strength of the bone china can be greatly improved; by adopting a lead-free formula, lead pollution is avoided, and environmental protection requirements are met; by optimizing the glaze formula and process, the surface of the bone china has good gloss and smoothness, and the problems of poor thermal stability of traditional bone china, easy cracking in an environment with large temperature changes, and affecting its service life and aesthetics are solved.

[0008] (II) Technical solution

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solution: A high-temperature hard glaze formula for bone china, comprising the following components in percentage by mass:

[0010] Silicon dioxide: 67%-72%;

[0011] Alumina: 4%-6%;

[0012] Boron oxide: 2%-5%;

[0013] Zinc oxide: 3%-7%;

[0014] Alkaline earth metal oxides: 3%-10%;

[0015] Alkali metal oxides: 7%-13%;

[0016] Zirconia: 0.5%-2%;

[0017] Titanium dioxide: 0.5%-1.5%.

[0018] Preferably, the alkaline earth metal oxide includes one or more of MgO, CaO, SrO, and BaO;

[0019] The alkali metal oxide includes Li 2 O、Na 2 O.K 2 One or more of O.

[0020] A bone china production process with a high-temperature hard glaze formula for bone china comprises the following steps:

[0021] S1. Preparation of blank: The bone china blank is composed of bone ash, kaolin, feldspar and quartz raw materials; the blank is formed by rolling forming, and the formed blank is bisque fired at a temperature of 1200°C-1300°C;

[0022] S2. Glaze preparation: After mixing the raw materials in the glaze formula according to the proportion, add an appropriate amount of water, and ball mill for 2 hours to prepare a glaze slurry;

[0023] S3, body glazing: using a glazing device to evenly distribute the glaze slurry on the sintered body using a single-side glazing method, and drying naturally after glazing;

[0024] S4. Glaze firing: glaze fire the glazed body at 1150℃±10℃ for 10-12 hours. After keeping warm for 1 hour, slowly cool to room temperature.

[0025] Preferably, the bone ash content in S1 is 30%-40%, the kaolin content is 20%-30%, the feldspar content is 15%-25%, and the quartz content is 10%-20%; and the sintering time is 8-12 hours, and the heat preservation is 2 hours.

[0026] Preferably, the glaze dipping device comprises a glaze dipping tank and a control mechanism for placing the bone china body into the glaze dipping tank for glazing;

[0027] The control mechanism comprises a clamping member for clamping the bone china blank, a rotating member for rotationally adjusting the clamping end of the clamping member, and a lifting member for lifting the clamping member up and down.

[0028] Preferably, the clamping member comprises a pressure cylinder, a piston plate sealingly sliding inside the pressure cylinder, and a first electric cylinder fixed to the pressure cylinder and used to drive the piston plate;

[0029] The bottom of the pressure cylinder is fixedly connected with a through pipe, and the bottom end of the through pipe is fixedly connected with an inflatable air bag.

[0030] Preferably, the lifting member includes an L-shaped support frame fixed on the glaze dipping trough and a second electric cylinder fixed on the L-shaped support frame. The top of the L-shaped support frame is slidably connected to a support plate via two guide rods, and the second electric cylinder is used to drive the support plate up and down. The pressure cylinder is rotatably connected to the inside of the support plate via a rotating plate.

[0031] Preferably, the top of the glaze dipping tank is slidably connected to a workbench in a forward and backward sliding manner, and two positioning frames are installed above the interior of the glaze dipping tank;

[0032] Both sides of the inner wall of the glaze dipping tank are rotatably connected with L-shaped rocking arms through a rotating shaft, a toggle plate is fixedly connected between the bottom ends of the two L-shaped rocking arms, and driving blocks for toggling the top ends of the L-shaped rocking arms are fixed on both sides of the bottom of the workbench.

[0033] (III) Beneficial effects

[0034] Compared with the prior art, the present invention provides a high-temperature hard glaze formula for bone china and a bone china production process, which has the following beneficial effects:

[0035] 1. The present invention effectively reduces the thermal expansion coefficient of the glaze and improves the thermal stability of bone china by adding appropriate amounts of boron oxide, zinc oxide and lithium oxide to the glaze; the flexural strength of bone china can be greatly improved by adding aluminum oxide; lead pollution is avoided by adopting a lead-free formula, which meets environmental protection requirements; and the bone china surface has good gloss and smoothness by optimizing the glaze formula and process.

[0036] 2. The present invention is used to transmit the pressure inside the pressure cylinder to the inside of the expandable airbag through the setting of the through pipe, so that the expandable airbag is expanded. Through the expansion of the expandable airbag, the bone china blank can be clamped from the inside to the outside, which has a good clamping function, improves the stability of its subsequent glazing, and is suitable for the clamping work of the bone china blank with a small bottle mouth, and solves the problem that the clamping method of the glazing device in the prior art mostly adopts external clamping, resulting in the clamping part being unable to be dipped in glaze, and the subsequent glazing operation needs to be repaired.

[0037] 3. The present invention is composed of an upper tube and a lower tube through a through tube, and the upper tube and the lower tube are connected by two hinged connecting frames, so that the angle of the lower tube can be adjusted, thereby realizing the adjustment of the angle of the clamped bone china body, thereby facilitating the bone china body to move in an inclined state during glazing and extraction, which not only facilitates the glaze liquid to enter the concave mouth at the bottom of the bone china body to improve its glazing effect, but also when the bone china body is taken out, the glaze liquid at the bottom of the bone china body is evenly dispersed by the rotation of the rotating member to drive the bone china body, thereby preventing the glaze liquid at the bottom of the bone china body from forming a point-like accumulation and affecting its glazing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the steps of the bone china production process of the high temperature hard glaze formula for bone china of the present invention;

[0039] Figure 2 It is a structural schematic diagram of the glaze dipping device of the present invention;

[0040] Figure 3 For the present invention Figure 2 Schematic diagram of the structure of the control mechanism;

[0041] Figure 4 For the present invention Figure 3 Structural schematic diagram of the middle lifting member;

[0042] Figure 5 For the present invention Figure 3 A schematic diagram of the combination of the clamping member, the rotating member and the lifting member;

[0043] Figure 6 For the present invention Figure 5 A schematic diagram of the structure of the middle clamping member;

[0044] Figure 7 For the present invention Figure 6 A schematic cross-sectional view of the middle clamping member;

[0045] Figure 8 For the present invention Figure 7 A partial enlarged view of the middle A;

[0046] Fig. 9 It is a schematic diagram of the clamping assembly of the clamping member and the bone china blank of the present invention;

[0047] Fig.10 For the present invention Figure 2 Schematic cross section of the mid-immersion glaze tank.

[0048] In the figure: 1, glaze dipping tank; 11, workbench; 12, positioning frame; 13, L-shaped swing arm; 14, toggle plate; 15, driving block;

[0049] 2. Bone china body;

[0050] 3. Clamping member; 31. Pressure cylinder; 32. First electric cylinder; 33. Piston plate; 34. Inflatable airbag; 35. Sealing plug; 36. Corrugated hose; 37. Connecting frame; 38. Torsion spring; 39. U-shaped touch rod; 310. Force block; 311. Through pipe;

[0051] 4. Rotating member; 41. Ring gear; 42. Motor; 43. Gear;

[0052] 5. Lifting member; 51. L-shaped support frame; 52. Second electric cylinder; 53. Guide rod; 54. Support plate. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Embodiment 1:

[0055] Refer to the attached Figure 1 , a high-temperature hard glaze formula for bone china and a bone china production process, comprising the following components in percentage by mass:

[0056] Silicon dioxide: 67%-72%;

[0057] Alumina: 4%-6%;

[0058] Boron oxide: 2%-5%;

[0059] Zinc oxide: 3%-7%;

[0060] Alkaline earth metal oxides: 3%-10%;

[0061] Alkali metal oxides: 7%-13%;

[0062] Zirconia: 0.5%-2%;

[0063] Titanium dioxide: 0.5%-1.5%.

[0064] Alkaline earth metal oxides include one or more of MgO, CaO, SrO, and BaO;

[0065] Alkali metal oxides include Li 2 O、Na 2 O.K 2 One or more of O;

[0066] It should be noted here that alumina is aluminum oxide;

[0067] By adding appropriate amounts of boron oxide, zinc oxide and lithium oxide to the glaze, the thermal expansion coefficient of the glaze is effectively reduced and the thermal stability of bone china is improved.

[0068] The flexural strength of bone china can be greatly improved by adding alumina.

[0069] By adopting a lead-free formula, lead pollution is avoided and environmental protection requirements are met.

[0070] Through optimized glaze formula and process, the bone china surface has good gloss and smoothness.

[0071] A bone china production process with a high-temperature hard glaze formula for bone china comprises the following steps:

[0072] S1. Preparation of blank: The bone china blank is made of bone ash, kaolin, feldspar and quartz raw materials; the blank is formed by rolling forming to ensure that the surface of the blank is smooth and free of defects, and the formed blank is bisque fired at a temperature of 1200℃-1300℃;

[0073] S2. Preparation of glaze: After mixing the raw materials in the glaze formula according to the proportion, add an appropriate amount of water, and ball-mill for 2 hours to prepare a glaze slurry; after the glaze reaches the fineness requirement and the ball milling is completed, the slurry is sieved through a 200-mesh sieve, and the sieved glaze slurry is poured into a beaker for later use;

[0074] S3, body glazing: the glaze slurry is evenly distributed on the sintered body by a glazing device using a single-side glazing method, and the glazing thickness is controlled at 0.15mm-0.25mm. After glazing, it is naturally dried at 120°C for 12 hours;

[0075] S4, glaze firing: glaze firing the glazed body at 1150℃±10℃ for 10-12 hours, keep warm for 1 hour, and then slowly cool to room temperature;

[0076] The production process of the invention is simple, easy to implement, can significantly improve the quality and performance of bone china, and has broad application prospects.

[0077] The bone ash content of S1 is 30%-40%, the kaolin content is 20%-30%, the feldspar content is 15%-25%, and the quartz content is 10%-20%; the sintering time is 8-12 hours, and the heat preservation time is 2 hours.

[0078] See attached Figures 2 to 10 The glazing device comprises a glazing tank 1 and a control mechanism for placing a bone china body 2 into the glazing tank 1 for glazing; the control mechanism comprises a clamping member 3 for clamping the bone china body 2, a rotating member 4 for rotating and adjusting the clamping end of the clamping member 3, and a lifting member 5 for lifting the clamping member 3 up and down;

[0079] The glaze dipping tank 1 is provided to store glaze liquid, the clamping member 3 in the control mechanism is provided to clamp the bone china body 2 to be dipped in glaze, the lifting member 5 in the control mechanism is provided to drive the clamped bone china body 2 to move to the glaze dipping tank 1 for dipping in glaze, and the rotating member 4 is provided to drive the bone china body 2 to rotate, thereby improving the comprehensiveness and effect of the dipping in glaze.

[0080] See attached Figures 2 to 10 The clamping member 3 includes a pressure cylinder 31, a piston plate 33 sealingly sliding inside the pressure cylinder 31, and a first electric cylinder 32 fixed on the pressure cylinder 31 and used to drive the piston plate 33;

[0081] The first electric cylinder 32 is connected to an external power source and a control switch, and is used to drive the piston plate 33 to telescope inside the pressure cylinder 31. Through the telescopic movement of the piston plate 33, the inflatable airbag 34 can be pressurized or depressurized through the through pipe 311, so that the inflatable airbag 34 can be contracted or expanded.

[0082] The telescopic end of the first electric cylinder 32 is fixedly connected to the piston plate 33, the bottom of the pressure cylinder 31 is fixedly connected to a through pipe 311, and the bottom end of the through pipe 311 is fixedly connected to an inflatable airbag 34, a sealing plug 35 is detachably installed on the outer surface of the through pipe 311, and a storage cavity is provided at the inner bottom of the through pipe 311;

[0083] The through pipe 311 is used to transmit the pressure inside the pressure cylinder 31 to the inside of the expandable airbag 34, so that the expandable airbag 34 is expanded. Through the expansion of the expandable airbag 34, the bone china blank 2 can be clamped from the inside to the outside, which has a good clamping function, improves the stability of the subsequent glazing, and is suitable for the clamping work of the bone china blank 2 with a small bottle mouth;

[0084] The invention solves the problem that the clamping method of the glaze dipping device in the prior art mostly adopts external clamping, which results in that the clamping part cannot be dipped in glaze and requires subsequent glaze repairing operation;

[0085] The sealing plug 35 is provided to seal the bottle mouth of the bone china body 2 to prevent the glaze liquid from entering the interior due to errors in the dipping operation;

[0086] A retractable cavity is provided at the inner bottom of the through tube 311, so that when the inflatable airbag 34 is inhaled through the through tube 311, the inflatable airbag 34 can be completely retracted into the inside of the through tube 311, thereby improving the smoothness of the through tube 311 being inserted into or pulled out of the bone china blank 2 and reducing its interference with the glaze layer on the outside of the bone china bottle body.

[0087] See attached Figures 3 to 5 The lifting member 5 includes an L-shaped support frame 51 fixed on the glaze dipping tank 1 and a second electric cylinder 52 fixed on the L-shaped support frame 51. The top of the L-shaped support frame 51 is slidably connected to a support plate 54 through two guide rods 53, and the second electric cylinder 52 is used to drive the support plate 54 up and down. The pressure cylinder 31 is rotatably connected to the inside of the support plate 54 through a rotating disk;

[0088] The second electric cylinder 52 is connected to an external power supply and a control switch, and is used to drive the support plate 54 to move up and down, thereby driving the clamping member 3 to move up and down, so that the clamping end of the clamping member 3 is inserted into the interior of the bone china body 2 for clamping, and the clamped bone china body 2 is driven to move to the interior of the glaze dipping tank 1 for glazing.

[0089] See attached Figure 5 The rotating member 4 includes an annular toothed disc 41 fixed to the top of the rotating disc and a motor 42 fixed to the top of the supporting disc 54, and the output shaft of the motor 42 is fixed with a gear 43 meshing with the annular toothed disc 41;

[0090] The motor 42 is connected to an external power supply and a control switch, and is a forward and reverse motor. It is set using the connection method and encoding method of the prior art, and is used to drive the gear 43 to rotate forward and reverse, and then the annular toothed disk 41 can drive the rotating disk to rotate, forming the overall angle rotation of the clamping member 3, realizing the rotation adjustment of the bone china blank 2, and improving the subsequent glazing effect.

[0091] Refer to the attached Figure 2 and Fig.10 The top of the glaze dipping tank 1 is slidably connected to a workbench 11 in a forward and backward sliding manner, and two positioning frames 12 are installed above the interior of the glaze dipping tank 1;

[0092] The setting of the workbench 11 facilitates the storage of the bone china blank 2 to be glazed, waiting for the subsequent clamping work. The setting of the two positioning frames 12 is used to position the position of the workbench 11, thereby improving the positioning of the bone china blank 2 for storage;

[0093] Both sides of the inner wall of the glaze dipping tank 1 are rotatably connected with L-shaped rocking arms 13 through a rotating shaft, a toggle plate 14 is fixedly connected between the bottom ends of the two L-shaped rocking arms 13, and both sides of the bottom of the workbench 11 are fixed with driving blocks 15 for toggling the top ends of the L-shaped rocking arms 13;

[0094] When the staff loads the bone china blank 2, the two driving blocks 15 can be driven to move forward and backward by pushing and pulling the workbench 11 forward and backward. The forward and backward movement of the two driving blocks 15 can toggle the top ends of the two L-shaped rocking arms 13, so that the two L-shaped rocking arms 13 move in a fan shape, and then drive the toggle plate 14 to move in a fan shape forward and backward, forming a self-surging treatment of the glaze liquid inside the glaze dipping tank 1, thereby improving the uniformity of the glaze liquid dispersion, increasing the quality of the subsequent glazing of the bone china blank 2, having the function of self-stirring, no separate operation is required, and the convenience of operation is improved.

[0095] Embodiment 2: Based on embodiment 1, the difference is that;

[0096] Raw material ratio: 30% bone ash, 25% kaolin, 20% feldspar, and 25% quartz.

[0097] Biscuit firing: Biscuit firing at 1250°C, keep warm for 2 hours.

[0098] Glaze formula: silicon dioxide 69%, aluminum oxide 5%, boron oxide 3%, zinc oxide 5%, magnesium oxide 3%, calcium oxide 5%, lithium oxide 3%, sodium oxide 5%, potassium oxide 2%, zirconium oxide 1%, titanium dioxide 1%.

[0099] Glazing: Glazing thickness is 0.2mm, and after natural drying, it is dried at 120℃ for 12 hours.

[0100] Glaze firing: glaze firing at 1150℃, keep warm for 1 hour, and cool slowly;

[0101] The above raw materials are ball-milled to a fineness of less than 300 μm, and the glaze specific gravity is controlled at 1.75 g / cm 3. The prepared glaze was evenly applied to the surface of the bone porcelain body 2 by the single-sided dipping method, and the glazing thickness was controlled at 0.2 mm. The glazed body was placed in a kiln, and the firing temperature was controlled at 1150°C for 11 hours. The fired bone porcelain was naturally cooled to room temperature, and the appearance and performance were inspected. The results showed that the glaze surface of the product was smooth, uniform, and matte, the thermal shock resistance temperature could reach 190°C, and the flexural strength could reach 1266.92 kg / cm 2 , the whiteness can reach 80.03.

[0102] Embodiment 3: Based on embodiment 1, the difference is that;

[0103] Raw material ratio: 35% bone ash, 20% kaolin, 25% feldspar, 20% quartz.

[0104] Biscuit firing: Biscuit firing at 1280℃, keep warm for 2 hours.

[0105] Glaze formula: 71% silicon dioxide, 4% aluminum oxide, 4% boron oxide, 4% zinc oxide, 2% lithium oxide, 3% strontium oxide, 6% sodium oxide, 3% potassium oxide, 1.5% zirconium oxide, and 0.5% titanium dioxide.

[0106] Glazing: Glazing thickness is 0.18mm, and after natural drying, it is dried at 120℃ for 12 hours.

[0107] Glaze firing: glaze firing at 1140℃, keep warm for 1 hour, and cool slowly;

[0108] The above raw materials are ball-milled to a fineness of less than 300 μm, and the glaze specific gravity is controlled at 1.7 g / cm 3 . The prepared glaze is evenly applied to the surface of the bone porcelain body 2 by the single-sided dipping method, and the glazing thickness is controlled at 0.15mm. The glazed body is placed in the kiln, and the firing temperature is controlled at 1140℃ for 10 hours. The fired bone porcelain is naturally cooled to room temperature, and the appearance and performance are inspected. The results show that the glaze surface of the product is smooth, uniform, and matte, the thermal shock resistance temperature can reach 180℃, and the flexural strength can reach 1250kg / cm 2 , the whiteness can reach 79.5.

[0109] Embodiment 4: Based on embodiment 1, the difference is that;

[0110] See attached Figures 6 to 9 The through pipe 311 includes an upper pipe and a lower pipe, and a corrugated hose 36 is fixedly connected between the upper pipe and the lower pipe, the upper pipe and the lower pipe are hinged by two connecting frames 37, and the hinged ends of the two connecting frames 37 are installed with torsion springs 38, the piston plate 33 is fixedly connected with a U-shaped touch rod 39, and the outer surface of the lower pipe is fixedly connected with an inclined force block 310;

[0111] The through pipe 311 is composed of an upper pipe and a lower pipe, and the upper pipe and the lower pipe are connected by two hinged connecting frames 37, so that the angle of the lower pipe can be adjusted, thereby realizing the adjustment of the angle of the clamped bone china blank 2, thereby facilitating the bone china blank 2 to move in an inclined state during glazing and extraction, which not only facilitates the glaze liquid to enter the concave opening at the bottom of the bone china blank 2, thereby improving its glazing effect, but also when the bone china blank 2 is taken out, the glaze liquid at the bottom of the bone china blank 2 is evenly dispersed by the rotation of the rotating member 4 on the bone china blank 2, thereby preventing the glaze liquid at the bottom of the bone china blank 2 from forming a point-like accumulation, thereby affecting its glazing effect;

[0112] The U-shaped touch rod 39 is fixedly connected to the piston plate 33, so that when the piston plate 33 moves downward to the expandable airbag 34 to clamp the bone china blank 2, through the continuous downward movement of the piston plate 33, one end of the U-shaped touch rod 39 can squeeze the inclined force block 310, so that the clamped bone china blank 2 automatically forms an angle inclination, which has a good linkage function. Moreover, through the continuous downward movement of the piston plate 33, not only the inclination of the clamping end angle is formed, but also the clamping force of the expandable airbag 34 on the bone china blank 2 can be further strengthened, thereby avoiding the problem of loosening of the bone china blank 2 when the angle is adjusted.

[0113] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0114] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature hard glaze formula for bone china, characterized in that: The following components are included in mass percentage: Silicon dioxide: 67%-72%; Alumina: 4%-6%; Boron oxide: 2%-5%; Zinc oxide: 3%-7%; Alkaline earth metal oxides: 3%-10%; Alkali metal oxides: 7%-13%; Zirconia: 0.5%-2%; Titanium dioxide: 0.5%-1.5%.

2. The high temperature hard glaze formula for bone china according to claim 1, characterized in that: The alkaline earth metal oxide includes one or more of MgO, CaO, SrO, and BaO; The alkali metal oxide includes one or more of Li2O, Na2O, and K2O.

3. A bone china production process with a high temperature hard glaze formula for bone china as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Preparation of blank: The bone china blank is composed of bone ash, kaolin, feldspar and quartz raw materials; the blank is formed by rolling forming, and the formed blank is bisque fired at a temperature of 1200°C-1300°C; S2. Glaze preparation: After mixing the raw materials in the glaze formula according to the proportion, add an appropriate amount of water, and ball mill for 2 hours to prepare a glaze slurry; S3, body glazing: using a glazing device to evenly distribute the glaze slurry on the sintered body using a single-side glazing method, and drying naturally after glazing; S4. Glaze firing: glaze fire the glazed body at 1150℃±10℃ for 10-12 hours. After keeping warm for 1 hour, slowly cool to room temperature.

4. The bone china production process of the high temperature hard glaze formula for bone china according to claim 3, characterized in that: The bone ash content of S1 is 30%-40%, the kaolin content is 20%-30%, the feldspar content is 15%-25%, and the quartz content is 10%-20%; the sintering time is 8-12 hours, and the heat preservation time is 2 hours.

5. The bone china production process of the high temperature hard glaze formula for bone china according to claim 3, characterized in that: The glaze dipping device comprises a glaze dipping tank and a control mechanism for placing the bone china body into the glaze dipping tank for glazing; The control mechanism comprises a clamping member for clamping the bone china blank, a rotating member for rotationally adjusting the clamping end of the clamping member, and a lifting member for lifting the clamping member up and down.

6. The bone china production process of the high temperature hard glaze formula for bone china according to claim 5, characterized in that: The clamping member comprises a pressure cylinder, a piston plate sealingly sliding inside the pressure cylinder, and a first electric cylinder fixed on the pressure cylinder and used to drive the piston plate; The bottom of the pressure cylinder is fixedly connected with a through pipe, and the bottom end of the through pipe is fixedly connected with an inflatable air bag.

7. The bone china production process of the high temperature hard glaze formula for bone china according to claim 5, characterized in that: The lifting member includes an L-shaped support frame fixed on the glaze dipping trough and a second electric cylinder fixed on the L-shaped support frame. The top of the L-shaped support frame is slidably connected to a support plate via two guide rods, and the second electric cylinder is used to drive the support plate up and down. The pressure cylinder is rotatably connected to the inside of the support plate via a rotating plate.

8. The bone china production process of the high temperature hard glaze formula for bone china according to claim 7, characterized in that: The top of the glaze dipping tank is slidably connected to a workbench in a forward and backward sliding manner, and two positioning frames are installed above the interior of the glaze dipping tank; Both sides of the inner wall of the glaze dipping tank are rotatably connected with L-shaped rocking arms through a rotating shaft, a toggle plate is fixedly connected between the bottom ends of the two L-shaped rocking arms, and driving blocks for toggling the top ends of the L-shaped rocking arms are fixed on both sides of the bottom of the workbench.

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