Pouring-molded mullite ladle nozzle brick and preparation method thereof

Abstract

The invention is applicable to the field of stone brick materials, and provides a cast-molded mullite ladle nozzle brick and a preparation method thereof, the cast-molded mullite ladle nozzle brick comprises a base and a nozzle, the base and the nozzle are integrally cast and molded; a cylindrical frame is poured in the base and the water gap, two series connection holes are further formed in the inserting rod, the series connection holes in each layer are connected in a penetrating and rubbing mode through asbestos fiber filaments, and the cylindrical frame, the inserting rod, the asbestos fiber filaments, the triangular blocks and the penetrating and inserting holes are poured in the base and the water gap. When the steel ladle nozzle brick is used, the support formed by assembling the cylinder frame, the inserting rods, the asbestos fiber filaments and the triangular blocks is poured into the base and the nozzle, the toughness of the steel ladle nozzle brick is improved through the asbestos fiber filaments, if the steel containing cylinder and the steel ladle nozzle brick in the steel containing cylinder are impacted, the asbestos fiber filaments temporarily pull cracked cracks, and the steel containing cylinder and the steel ladle nozzle brick in the steel containing cylinder are not damaged. A worker carries out safety treatment on molten steel in the steel containing cylinder, and after the steel containing cylinder is cooled, the steel ladle nozzle brick is detached and replaced with a new one, so that the safety protection function is achieved.

Description

Technical Field

[0001] The invention belongs to the field of stone brick materials, and particularly relates to a cast-molded mullite ladle nozzle brick and a preparation method thereof. Background Art

[0002] With the development of industrial technology, modern stone brick material technology has become more and more perfect. Mullite is widely used in the field of smelting as a high-temperature resistant material. The ladle nozzle brick made of mullite is placed at the bottom of the steel cylinder to control the outflow of molten steel. The temperature of the molten steel will not have much impact on the system of mullite. In the past, mullite would be added with a lot of auxiliary materials and formed by a casting process; As disclosed in patent No. 201911045078.4, a carbon-free pouring nozzle for a ladle and its preparation method, the raw materials of the carbon-free pouring nozzle for a ladle include, by mass: 37 to 76 parts of corundum; 0 to 16 parts of zirconium mullite; 0 to 8 parts of mullite; 10 to 16 parts of alumina powder; 1 to 6 parts of calcium aluminate cement. The carbon-free pouring nozzle for a ladle of the present application utilizes the needle-like crystal structure of mullite and the lattice brick transformation characteristics of zirconium oxide to improve the thermal shock stability of the material of the carbon-free pouring nozzle for a ladle, improve the cracking problem that occurs during use, and extend the service life of the carbon-free pouring nozzle for a ladle; The device still has defects when in use. The material of the carbon-free pouring nozzle of the ladle is mixed with a variety of raw materials. After these raw materials are evenly mixed together, they can better withstand high temperatures. However, the carbon-free pouring nozzle made with this ratio is relatively brittle and hard. If the steel cylinder equipped with the carbon-free pouring nozzle is hit, the carbon-free pouring nozzle will crack and slag, which will affect the normal use of the steel cylinder. If the cracked small pieces fall out, the molten steel inside the steel cylinder will instantly tilt out, which will be dangerous. Summary of the invention

[0003] The purpose of the present invention is to provide a cast mullite ladle nozzle brick and a preparation method thereof in view of the deficiencies in the prior art. When the device is in use, a bracket composed of a cylindrical frame, a plug rod, asbestos fiber filaments and a triangular block is assembled to cast the base and the inside of the nozzle. The asbestos fiber filaments increase the toughness of the ladle nozzle brick. If a steel cylinder and the ladle nozzle bricks inside the ladle are impacted, the ladle nozzle bricks are less likely to crack. If the ladle nozzle bricks crack, the asbestos fiber filaments will temporarily pull the cracks. The staff will safely handle the molten steel inside the steel cylinder, and then disassemble the ladle nozzle bricks and replace them with new ones after the steel cylinder is cooled, so as to solve the problems mentioned in the background technology.

[0004] To solve the above problems, the present invention provides the following technical solutions: a cast mullite ladle nozzle brick, comprising a base and a nozzle, the base and the nozzle are cast as one piece; a cylindrical frame is cast inside the base and the nozzle, the cylindrical frame is in the shape of a thin-walled cylindrical structure, and a rectangular opening of a three-layer annular array is cut out on the cylindrical frame; four layers of annular arrays of interlaced eyes are arranged on the outer wall of the cylindrical frame, and each layer of the annular array has six interlaced eyes, and an insertion rod is inserted inside each of the interlaced eyes, and each insertion rod is provided with two triangular blocks, and the side wall of the triangular block is provided with an interlaced hole matching the cross section of the insertion rod; two series eyes are also provided on the insertion rod, and each layer of the series eyes is connected by rubbing of asbestos fiber threads, and the cylindrical frame, the insertion rod, the asbestos fiber threads, the triangular blocks and the interlaced holes are cast inside the base and the nozzle.

[0005] Furthermore, the material of the cylindrical frame is mullite, and auxiliary materials are added after the mullite powder is ground into powder, wherein the auxiliary materials include fused white corundum, bauxite and aluminum oxide powder, wherein the mass of mullite powder accounts for 73%, the mass of fused white corundum accounts for 14%, the mass of bauxite accounts for 12%, and the mass of aluminum oxide powder accounts for 1%.

[0006] Furthermore, the material of the plug rod and the triangular block is quartz sand, of which quartz sand accounts for 88% by weight, auxiliary materials of the plug rod account for 12% by weight, and the auxiliary materials include titanium dioxide accounting for 9% by weight and ferric oxide accounting for 3% by weight.

[0007] Furthermore, the asbestos fiber filaments are spirally woven into strips of asbestos material, aluminum oxide powder is mixed into the woven strips of asbestos material, and the interlaced holes on the side walls of each layer of spiral array triangle blocks are connected in series with asbestos fiber filaments.

[0008] Furthermore, the rectangular opening on the side wall of the cylinder frame is made by wire cutting, and the inner diameter of the through hole on the side wall of the cylinder frame is larger than the outer diameter of the insertion rod.

[0009] Furthermore, the mass proportion of mullite in the base and the nozzle is 88%, the mass proportion of auxiliary material ore powder is 9%, and the mass proportion of inorganic salt is 3%.

[0010] Furthermore, the auxiliary ore includes 3% by mass of corundum powder, 3% by mass of silicon powder, 2% by mass of calcium aluminate cement and 1% by mass of alumina powder, and the inorganic salt includes 2.3% by mass of silicon dioxide, 0.2% by mass of potassium oxide and 0.5% by mass of sodium oxide.

[0011] Further, the following steps are included: S1. The mullite raw material is ground into powder, the minimum particle diameter of the powder material is micrometers, and then the mullite powder, fused white corundum, bauxite and aluminum oxide powder are mixed together and temporarily bonded together with water, and the bonded raw materials are filled into a cylindrical mold for shaping. The cylindrical blank after shaping is quickly evaporated in a furnace at 850°C and sintered into shape; S2. Use tungsten material to make a mold shell that matches the base and the nozzle contour. The mold shell is divided into two symmetrical parts, and the top of the mold shell is provided with an injection port. Assemble the cylinder frame, the insertion rod, the asbestos fiber, the triangular block and the insertion hole and insert them into the two halves of the mold shell, and then merge the two halves of the mold shell; S3. The mullite raw material is introduced into a heating furnace, the mullite raw material is heated to 1600°C to soften the raw material, and the auxiliary ore powder is added to the sticky mullite until the auxiliary ore powder is evenly diffused into the sticky mullite, and then the mullite raw material is heated to 1700°C and maintained for fifteen minutes, and the inorganic salt auxiliary material is added until the inorganic salt is completely melted; S4. Pour the viscous mullite raw material into the mold shell of tungsten material, and the cylindrical frame, plug rod, asbestos fiber, triangular block and assembly frame of through holes will be poured inside the viscous mullite, and then the viscous mullite will be shaped and demolded after it cools down.

[0012] Compared with the prior art, the embodiments of the present application have the following beneficial effects: The support casting base and the inside of the nozzle are assembled by cylinder frame, plug rod, asbestos fiber wire and triangular block. The asbestos fiber wire increases the toughness of the ladle nozzle bricks. If the steel cylinder and the ladle nozzle bricks inside it are hit, the ladle nozzle bricks are less likely to crack. If the ladle nozzle bricks are cracked, the asbestos fiber wire will temporarily pull the cracks. The staff will safely handle the molten steel inside the steel cylinder and remove the ladle nozzle bricks and replace them with new ones after the steel cylinder is cooled. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a cross-section of the present invention.

[0014] Figure 2 It is a schematic diagram of a cylinder frame of the present invention.

[0015] Figure 3 It is a schematic diagram of the second viewing angle of the cylinder frame of the present invention.

[0016] Figure 4 Schematic diagram of the plunger of the present invention.

[0017] Figure 5 It is a schematic diagram of the asbestos fiber filament of the present invention.

[0018] Figure 6 Schematic diagram of the triangular block of the present invention.

[0019] Description of reference numerals: Base 1, water inlet 2, cylinder frame 3, plug rod 4, asbestos fiber 5, triangular block 6, insertion hole 601. DETAILED DESCRIPTION

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] The present invention provides a cast-molded mullite ladle nozzle brick, such as Figure 1-6 As shown, it includes a base 1 and a nozzle 2, and the base 1 and the nozzle 2 are cast as one piece; a cylindrical frame 3 is cast inside the base 1 and the nozzle 2, and the cylindrical frame 3 is in the shape of a thin-walled cylindrical structure, and a rectangular opening of a three-layer annular array is cut out on the cylindrical frame 3; four layers of annular arrays of interlaced eyes are arranged on the outer wall of the cylindrical frame 3, and each layer of the annular array has six interlaced eyes, and an insertion rod 4 is inserted inside each of the interlaced eyes, and each insertion rod 4 is provided with two triangular blocks 6, and the side wall of the triangular block 6 is provided with an interlaced hole 601 matching the cross-section of the insertion rod 4; the insertion rod 4 is also provided with two series eyes, and each layer of the series eyes is connected by rubbing of asbestos fiber filaments 5, and the cylindrical frame 3, the insertion rod 4, the asbestos fiber filaments 5, the triangular blocks 6 and the interlaced holes 601 are cast inside the base 1 and the nozzle 2.

[0023] In this embodiment, the support pouring base 1 and the inside of the nozzle 2 are assembled by the cylinder frame 3, the plug rod 4, the asbestos fiber filaments 5, and the triangular block 6. The asbestos fiber filaments 5 increase the toughness of the ladle nozzle bricks. If the steel cylinder and the ladle nozzle bricks inside it are hit, the ladle nozzle bricks are less likely to crack. If the ladle nozzle bricks are cracked, the asbestos fiber filaments will temporarily pull the cracks. The staff will safely handle the molten steel inside the steel cylinder, and then disassemble the ladle nozzle bricks and replace them with new ones after the steel cylinder is cooled. Compared with the prior art ladle carbon-free pouring nozzle, the materials of the previous ladle carbon-free pouring nozzle are made of a variety of raw materials. The raw materials are proportioned, and these raw materials can better withstand high temperatures after being evenly mixed together. However, the carbon-free pouring nozzle made with this proportion is relatively brittle and hard. If the steel cylinder equipped with the carbon-free pouring nozzle is hit, the carbon-free pouring nozzle will crack and slag, which will affect the normal use of the steel cylinder. If the cracked small pieces fall out, the molten steel inside the steel cylinder will tilt out instantly, which will be dangerous. The ladle nozzle brick of the present invention can ensure short-term safety when it is damaged, and the staff can handle the high-temperature molten steel within this safe time, thereby avoiding the danger caused by leakage of high-temperature molten steel.

[0024] The material of the cylindrical frame 3 is mullite, and auxiliary materials are added after the mullite powder is ground into powder, wherein the auxiliary materials include fused white corundum, bauxite and aluminum oxide powder, wherein the mass of mullite powder accounts for 73%, the mass of fused white corundum accounts for 14%, the mass of bauxite accounts for 12%, and the mass of aluminum oxide powder accounts for 1%.

[0025] In this embodiment, the cylindrical frames 3 are combined together to form a skeleton structure inside the ladle nozzle brick. Electric fused white corundum is added to the cylindrical frames 3 and the insertion rods 4, so that the structural strength of the cylindrical frames 3 is greater than the strength of the base 1 and the nozzle 2, reducing the probability of the ladle nozzle brick breaking.

[0026] The material of the insert rod 4 and the triangular block 6 is quartz sand, of which the mass of quartz sand accounts for 88%, the mass of the insert rod 4 accounts for 12%, and the mass of the auxiliary materials includes titanium dioxide accounting for 9% and ferric oxide accounting for 3%.

[0027] In this embodiment, quartz sand material is mixed into the insert rod 4 and the triangular block 6, so as to increase the beam-supporting strength of the insert rod 4, and the triangular block 6 increases the contact area between the insert rod 4 and the ladle nozzle brick.

[0028] The asbestos fiber filaments 5 are made of asbestos material woven spirally into strips, and aluminum oxide powder is mixed into the woven strips of the asbestos material. The insertion holes 601 on the side walls of each layer of the spiral array triangle block 6 are connected in series with the asbestos fiber filaments 5 .

[0029] In this embodiment, the asbestos fiber filaments 5 are made into filaments, and the staff can make the diameter of the asbestos fiber filaments 5 according to the actual needs of processing. For a large steel cylinder, more asbestos fiber filaments 5 can be inserted.

[0030] The rectangular opening on the side wall of the cylinder frame 3 is made by wire cutting, and the inner diameter of the through hole on the side wall of the cylinder frame 3 is larger than the outer diameter of the insertion rod 4.

[0031] In this embodiment, the insertion rod 4 is inserted into the interlaced hole on the outer wall of the cylindrical frame 3 to form an expanded bracket. If more asbestos fiber filaments 5 need to be installed, a longer insertion rod 4 is replaced.

[0032] The mass proportion of mullite in the base 1 and the nozzle 2 is 88%, the mass proportion of auxiliary material ore powder is 9%, and the mass proportion of inorganic salt is 3%.

[0033] The fusion of mineral powder and inorganic salt can improve the density of ladle nozzle bricks, thereby improving the corrosion resistance of molten steel to the brick body and preventing slag from falling off the brick body.

[0034] The auxiliary ore includes corundum powder accounting for 3% by mass, silicon micropowder accounting for 3% by mass, calcium aluminate cement accounting for 2% by mass and alumina micropowder accounting for 1% by mass, and the inorganic salt includes silicon dioxide accounting for 2.3% by mass, potassium oxide accounting for 0.2% by mass and sodium oxide accounting for 0.5% by mass.

[0035] The staff customizes the ladle nozzle bricks according to the actual needs of molten steel processing. The proportion of auxiliary ore and inorganic salt can be adjusted to change the physical properties of the ladle nozzle bricks.

[0036] The following steps are involved: S1. The mullite raw material is ground into powder, the minimum particle diameter of the powder material is 20 microns, and then the mullite powder, fused white corundum, bauxite and aluminum oxide powder are mixed together and temporarily bonded together with water, and the bonded raw materials are filled into a cylindrical mold for shaping. The cylindrical blank after shaping is quickly evaporated in a furnace at 850°C and sintered into shape; S2. A mold shell is made of tungsten material to match the contours of the base 1 and the nozzle 2. The mold shell is divided into two symmetrical parts, and an injection port is provided at the top of the mold shell. The cylindrical frame 3, the insertion rod 4, the asbestos fiber filament 5, the triangular block 6 and the insertion hole 601 are assembled and inserted into the two halves of the mold shell, and then the two halves of the mold shell are combined; S3. The mullite raw material is introduced into a heating furnace, the mullite raw material is heated to 1600°C to soften the raw material, and the auxiliary ore powder is added to the sticky mullite until the auxiliary ore powder is evenly diffused into the sticky mullite, and then the mullite raw material is heated to 1700°C and maintained for fifteen minutes, and the inorganic salt auxiliary material is added until the inorganic salt is completely melted; S4. Pour the viscous mullite raw material into the mold shell of the tungsten material, and the assembly frame of the cylindrical frame 3, the insertion rod 4, the asbestos fiber filament 5, the triangular block 6 and the insertion hole 601 will be poured inside the viscous mullite, and then the viscous mullite will be shaped and demolded after it cools down.

[0037] Working principle: The support composed of the cylinder frame 3, the plug rod 4, the asbestos fiber filament 5 and the triangular block 6 is cast inside the base 1 and the nozzle 2. The asbestos fiber filament 5 increases the toughness of the ladle nozzle brick. If the steel cylinder and the ladle nozzle brick inside it are hit, the ladle nozzle brick is less likely to crack. If the ladle nozzle brick cracks, the asbestos fiber filament will temporarily pull the crack. The staff will safely handle the molten steel inside the steel cylinder and remove and replace the ladle nozzle brick after the steel cylinder cools down. Compared with the existing technology of carbon-free pouring nozzle for steel ladles, the materials of the carbon-free pouring nozzle for steel ladles in the past are made of a variety of raw materials. After these raw materials are evenly mixed together, they can better withstand high temperatures. However, the carbon-free pouring nozzle made by this ratio is relatively brittle and hard. If the steel cylinder equipped with the carbon-free pouring nozzle is hit, the carbon-free pouring nozzle will crack and slag, which will affect the normal use of the steel cylinder. If the cracked small pieces fall out, the molten steel inside the steel cylinder will instantly tilt out. The present invention can ensure the safety of the ladle nozzle brick for a short time when it is damaged. The staff can handle the high-temperature molten steel within this safe time, thereby avoiding the danger caused by the leakage of the high-temperature molten steel. The cylindrical frame 3 is combined to form a skeleton structure inside the ladle nozzle brick. The cylindrical frame 3 and the plug rod 4 are mixed with fused white corundum, so that the structural strength of the cylindrical frame 3 is greater than the strength of the base 1 and the nozzle 2, reducing the probability of the ladle nozzle brick breaking. The plug rod 4 and the triangular block 6 are mixed with quartz sand material, thereby increasing the beam strength of the plug rod 4. The triangular block 6 increases the contact area between the plug rod 4 and the ladle nozzle brick. The asbestos fiber filament 5 is made into a filament. The staff can pretend the diameter of the asbestos fiber filament 5 according to the actual needs of the processing. For large steel cylinders, more asbestos fiber filaments 5 can be inserted. The plug rod 4 is inserted into the interlaced eye on the outer wall of the cylindrical frame 3 to form an expanded bracket. If more asbestos fiber filaments 5 need to be installed, a longer plug rod 4 is replaced.

[0038] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0039] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of the above-mentioned units. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.

[0040] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A cast mullite ladle nozzle brick, characterized in that: It comprises a base (1) and a nozzle (2), wherein the base (1) and the nozzle (2) are integrally cast; A cylindrical frame (3) is cast inside the base (1) and the nozzle (2); the cylindrical frame (3) is in the shape of a thin-walled cylindrical structure, and rectangular openings in a three-layer annular array are cut out of the cylindrical frame (3); The outer wall of the cylindrical frame (3) is provided with four layers of annular arrays of interpenetrating eyes, each layer of the annular array is provided with six interpenetrating eyes, an insertion rod (4) is inserted inside each of the interpenetrating eyes, each insertion rod (4) is provided with two triangular blocks (6), and the side wall of the triangular block (6) is provided with an interpenetrating hole (601) matching the cross section of the insertion rod (4); The insertion rod (4) is also provided with two series holes, and each layer of the series holes is connected by rubbing with asbestos fiber threads (5). The cylindrical frame (3), the insertion rod (4), the asbestos fiber threads (5), the triangular block (6) and the insertion hole (601) are cast inside the base (1) and the water outlet (2).

2. The cast mullite ladle nozzle brick according to claim 1, characterized in that: The cylindrical frame (3) is made of mullite. After the mullite powder is ground into powder, auxiliary materials are added. The auxiliary materials include fused white corundum, bauxite and aluminum oxide powder. The mass of the mullite powder accounts for 73%, the mass of the fused white corundum accounts for 14%, the mass of the bauxite accounts for 12%, and the mass of the aluminum oxide powder accounts for 1%.

3. The cast mullite ladle nozzle brick according to claim 1, characterized in that: The material of the insert rod (4) and the triangular block (6) is quartz sand, of which the mass of quartz sand accounts for 88%, the mass of the insert rod (4) accounts for 12%, and the mass of the auxiliary materials includes titanium dioxide accounting for 9% and ferric oxide accounting for 3%.

4. The cast mullite ladle nozzle brick according to claim 1, characterized in that: The asbestos fiber filaments (5) are made of asbestos material woven spirally into strips, and aluminum oxide powder is mixed into the woven strips of the asbestos material. The interpenetrating holes (601) on the side walls of each layer of the spiral array triangle block (6) are connected in series with the asbestos fiber filaments (5).

5. The cast-molded mullite ladle nozzle brick according to claim 1, characterized in that: The rectangular opening on the side wall of the cylindrical frame (3) is made by wire cutting, and the inner diameter of the insertion hole on the side wall of the cylindrical frame (3) is larger than the outer diameter of the insertion rod (4).

6. The cast mullite ladle nozzle brick according to claim 1, characterized in that: The mass proportion of mullite in the base (1) and the nozzle (2) is 88%, the mass proportion of auxiliary material ore powder is 9%, and the mass proportion of inorganic salt is 3%.

7. The cast-molded mullite ladle nozzle brick according to claim 6, characterized in that: The auxiliary ore includes corundum powder accounting for 3% by mass, silicon micropowder accounting for 3% by mass, calcium aluminate cement accounting for 2% by mass and alumina micropowder accounting for 1% by mass, and the inorganic salt includes silicon dioxide accounting for 2.3% by mass, potassium oxide accounting for 0.2% by mass and sodium oxide accounting for 0.5% by mass.

8. A method for preparing a cast mullite ladle nozzle brick according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. The mullite raw material is ground into powder, the minimum particle diameter of the powder material is 20 microns, and then the mullite powder, fused white corundum, bauxite and aluminum oxide powder are mixed together and temporarily bonded together with water, and the bonded raw materials are filled into a cylindrical mold for shaping. The cylindrical blank after shaping is quickly evaporated in a furnace at 850°C and sintered into shape; S2. A mold shell is made of tungsten material and matches the contours of the base (1) and the nozzle (2). The mold shell is divided into two symmetrical parts, and an injection port is provided at the top of the mold shell. The cylindrical frame (3), the insertion rod (4), the asbestos fiber (5), the triangular block (6) and the insertion hole (601) are assembled and inserted into the two halves of the mold shell, and then the two halves of the mold shell are combined; S3. The mullite raw material is introduced into a heating furnace, the mullite raw material is heated to 1600°C to soften the raw material, and the auxiliary ore powder is added to the sticky mullite until the auxiliary ore powder is evenly diffused into the sticky mullite, and then the mullite raw material is heated to 1700°C and maintained for fifteen minutes, and the inorganic salt auxiliary material is added until the inorganic salt is completely melted; S4. The viscous mullite raw material is poured into the mold shell of the tungsten material, and the assembly frame of the cylindrical frame (3), the insertion rod (4), the asbestos fiber wire (5), the triangular block (6) and the insertion hole (601) is poured inside the viscous mullite. After the viscous mullite is cooled, it is shaped and demolded.

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