Preparation method of porous yttrium oxide crucible, large-size crucible and application of large-size crucible in titanium-aluminum alloy smelting

Abstract

The invention discloses a preparation method of a porous yttrium oxide crucible, a large-size crucible and application of the large-size crucible in titanium-aluminum alloy smelting, belongs to the field of oxide ceramic crucibles, and aims to solve the problem that the yttrium oxide Y2O3 crucible has good mechanical properties and thermal shock resistance at the same time. The preparation method comprises the following steps: adding 30-40% by mass of yttrium oxide Y2O3 electric smelting mixed powder with the particle size of 1-3mm, 20-40% by mass of yttrium oxide Y2O3 electric smelting mixed powder with the particle size of 60-300 meshes and 20-30% by mass of yttrium oxide Y2O3 electric smelting mixed powder with the particle size of 1-3mu m into grinding balls for ball milling, granulation treatment, cold isostatic pressing and the like to obtain a crucible green body, sintering the crucible green body at 1650-1750 DEG C, and cooling to room temperature to obtain the high-purity yttrium oxide ceramic crucible. The porous yttrium oxide crucible has the effect that the crucible can have good mechanical properties and thermal shock resistance at the same time.

Description

Technical Field

[0001] The invention belongs to the field of oxide ceramic crucibles, and in particular relates to a method for preparing a large-size porous yttrium oxide crucible for smelting titanium-aluminum alloys and a crucible prepared by the method. Background Art

[0002] Titanium aluminum alloy is one of the ideal structural materials for engines in the fields of aerospace, shipbuilding and marine engineering due to its high strength, corrosion resistance and good heat resistance. Currently, it is mainly melted by high-energy-consuming technologies such as vacuum autoclave melting (VAR), plasma arc melting (PAM), induction shell melting (ISM) and electron beam cold bed melting (EB). The above melting methods have high production costs.

[0003] The crucible materials currently used for vacuum melting of highly active metals are mainly calcium oxide (CaO), magnesium oxide (MgO), aluminum oxide (Al2O3), boron nitride (BN), etc. The operating temperature of the crucible is generally 1200-1500°C. However, the melting point of titanium and titanium-aluminum alloy is close to 1700°C. The above crucible materials cannot meet the needs of large-scale industrial production.

[0004] Yttrium oxide Y2O3 is an important raw material of rare earth oxides, with a melting point higher than 2400℃, excellent high temperature resistance, corrosion resistance and chemical stability, and is an important functional ceramic and structural ceramic material. Yttrium oxide Y2O3 has excellent thermodynamic stability and is difficult to react with active metals under high temperature conditions, making it suitable as a crucible material for the preparation of titanium and titanium-aluminum alloy reaction smelting.

[0005] However, it is difficult to shape yttrium oxide ceramics in industrial production, and the volume changes greatly during sintering. Therefore, in the traditional refractory material preparation process, yttrium oxide Y2O3 only exists in the form of additives or crucible surface coatings. At present, when yttrium oxide Y2O3 is prepared as a crucible refractory material, its own performance is difficult to achieve both thermal shock resistance and mechanical properties. It is generally believed that the prepared large-sized yttrium oxide crucible has poor thermal shock resistance and a short crucible life while ensuring strength. Summary of the invention

[0006] In order to solve the problem that the yttrium oxide Y2O3 crucible has both good mechanical properties and thermal shock resistance, the preparation method of the porous yttrium oxide crucible according to some embodiments of the present application includes:

[0007] S1. 30% to 40% by weight of yttrium oxide Y2O3 fused mixed powder with a particle size of 1 to 3 mm, 20% to 40% of yttrium oxide Y2O3 fused mixed powder with a particle size of 60 to 300 mesh, and 20% to 30% of yttrium oxide Y2O3 fused mixed powder with a particle size of 1 to 3 μm are added to grinding balls for ball milling, the ball milling speed is 120 to 150 r / min, and the mixing time is 3 to 5 h;

[0008] S2. Adding a binder polyvinyl alcohol PVA solution to the mixed powder after ball milling, mixing and grinding, granulating, then sieving to obtain coarse granules, and aging;

[0009] S3. The coarse granules obtained after aging are cold isostatically pressed to obtain a crucible preform;

[0010] S4. Drying the preformed crucible to obtain a green crucible;

[0011] S5. The green crucible is sintered at 1650° C. to 1750° C. and cooled to room temperature to obtain the porous yttrium oxide crucible.

[0012] According to the preparation method of the porous yttrium oxide crucible in some embodiments of the present application, in step S1, by mass, 1-3 mm yttrium oxide Y2O3 fused mixed powder: 60-300 mesh yttrium oxide Y2O3 fused mixed powder: 1-3 μm yttrium oxide Y2O3 fused mixed powder = 4:3:3 or 3:4:3.

[0013] According to the method for preparing a porous yttria crucible in some embodiments of the present application, the green crucible is sintered at 1750°C.

[0014] According to the preparation method of the porous yttrium oxide crucible of some embodiments of the present application, in step S2, by mass, polyvinyl alcohol PVA: mixed powder = 1:20, the concentration of polyvinyl alcohol PVA binder solution is configured at 8%, the mixed powder and the binder polyvinyl alcohol PVA are fully mixed and ground to make the particle size evenly distributed, and coarse granules with a particle size of 6 to 10 mesh are obtained by sieving, and the coarse granules are aged and stored for 24 hours.

[0015] According to the preparation method of the porous yttrium oxide crucible in some embodiments of the present application, in step S3, the coarse pellets obtained after aging treatment are loaded into the crucible model cavity, and then the crucible model cavity is placed on a vibrating operating platform for 3 to 5 minutes to complete the filling operation, and after sealing the mold, it is placed in the high-pressure oil chamber of the cold isostatic press, and the pressure is maintained at 150 to 220 MPa for 5 to 15 minutes, and the crucible preform is taken out and demolded to obtain a crucible preform.

[0016] According to the method for preparing a porous yttria crucible in some embodiments of the present application, in step S4, the crucible preform is dried in a natural environment for 24 hours to 48 hours, and then placed in an oven at 100 to 150° C. to dry for 12 to 18 hours.

[0017] According to the preparation method of the porous yttrium oxide crucible of some embodiments of the present application, in step S5, the crucible green body is placed in a sintering furnace, and the temperature is increased to a final sintering temperature of 1650°C to 1750°C at a heating rate of 0.5 to 5°C / min. After being kept warm for 20 to 50 hours, it is cooled with the furnace to complete the plastic removal and sintering process to obtain the large-sized porous yttrium oxide crucible for smelting titanium-aluminum alloy.

[0018] According to the method for preparing a porous yttrium oxide crucible in some embodiments of the present application, in step S1, the yttrium oxide Y2O3 fused mixed powder with a particle size of 1 to 3 mm is prepared by mixing yttrium oxide Y2O3 fused powder with a particle size of 1 to 3 mm;

[0019] The yttrium oxide Y2O3 fused mixed powder with a particle size of 60 to 300 meshes is prepared by mixing the yttrium oxide Y2O3 fused mixed powder with a particle size of 60 to 300 meshes;

[0020] The yttrium oxide Y2O3 fused mixed powder with a particle size of 1 to 3 μm is prepared by mixing yttrium oxide Y2O3 fused mixed powder with a particle size of 1 to 3 μm;

[0021] Among them, three kinds of yttrium oxide Y2O3 fused mixed powders with different particle sizes are added into grinding balls in order from large to small for ball milling;

[0022] Among them, the porous yttrium oxide crucible is a large-sized crucible with an outer diameter of 124 to 133 mm and a height of 218 to 232 mm.

[0023] A crucible prepared according to any one of the preparation methods described in some embodiments of the present application.

[0024] According to some embodiments of the present application, the crucible is used for melting titanium-aluminum alloy.

[0025] Beneficial effect: The present invention uses three different particle sizes of yttrium oxide Y2O3 particles or micron fine powders for grading, which can be distinguished from other solutions that do not use coarse particles or use other ranges of particle size selection and distribution, so that the medium and coarse powders are the skeletons, and the fine powders are evenly distributed between the large skeletons to form a dense structure, which can improve the uniformity and density of the microstructure, high strength, and high porosity, and the number of thermal cycles reflecting the thermal shock resistance is high. In particular, by mass, 1-3mm yttrium oxide Y2O3 electromelted mixed powder: 60-300 mesh yttrium oxide Y2O3 electromelted mixed powder: 1-3μm yttrium oxide Y2O3 electromelted mixed powder = 4:3:3 or 3:4:3. The experimental results show that 1-3mm yttrium oxide Y2O3 electromelted mixed powder accounts for 30% to 40%, the balance of crucible strength and porosity is the best, the thermal shock resistance is the highest, and it can have good mechanical properties (strength) and thermal shock resistance at the same time.

[0026] The present invention adopts cold isostatic pressing to prepare yttria refractory products, and combines precise systems of plastic removal and sintering to obtain large-sized porous yttria crucibles with good mechanical properties and thermal shock resistance. The preparation of large-sized porous yttria crucibles with simple process, controllable size and reliable performance is achieved, and finally high-quality and low-cost vacuum induction melting of titanium-aluminum alloy crucibles is achieved, which can realize low-energy consumption and energy-saving melting of titanium and titanium-aluminum alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a real photo of an yttrium oxide crucible made by the process of the present invention.

[0028] Figure 2 This is a photo of the inner surface of titanium-aluminum alloy melted in a yttria crucible using vacuum induction melting.

[0029] Figure 3 This is the microstructure morphology of yttrium oxide crucible.

[0030] Figure 4 These are the microstructure morphologies of the crucible at different sintering temperatures: a. microstructure morphology of the crucible at 1650℃, b. microstructure morphology of the crucible at 1700℃, and c. microstructure morphology of the crucible at 1750℃.

[0031] Figure 5 Cyclic thermal shock experiment diagram. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below with reference to the accompanying drawings, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0033] The purpose of the present invention is to provide a large-sized porous yttria crucible with good thermal shock resistance and mechanical properties suitable for smelting titanium aluminum alloy and a preparation method thereof. The preparation process is simple, the size is controllable, and the performance is reliable. The preparation method specifically comprises the following steps:

[0034] S1: 30% to 40% of 1 to 3 mm yttrium oxide Y2O3 fused powder, 20% to 40% of 60 to 300 mesh yttrium oxide Y2O3 fused powder, and 20% to 30% of 1 to 3 μm yttrium oxide Y2O3 fused powder are mixed in proportion, and the yttrium oxide Y2O3 fused powder used in different particle size groups is added to the mixing device in descending order, and zirconium oxide ZrO2 grinding balls are added, and the mixture is ball milled for 4 hours at a speed of 120 to 150 r / min to obtain a mixed powder. In this method of forming a powder with yttrium oxide Y2O3 particles of different particle sizes, coarse powder will reduce the sintering ability and lead to a porous structure; fine powder will lead to enhanced sintering ability and a dense structure. If the coarse powder and fine powder are matched in a suitable proportion, the yttrium oxide refractory crucible after sintering can achieve both thermal shock resistance and mechanical properties.

[0035] S2: preparing polyvinyl alcohol (PVA) binder solution: during the molding process, 0.5-0.8 g of polyvinyl alcohol (PVA) is added as an additive for every 10 g of yttrium oxide (Y2O3), and the concentration of the PVA binder solution is configured to 8%.

[0036] S3: The mixed powder is mixed with the binder and then granulated.

[0037] S4: The yttrium oxide Y2O3 particles prepared in the third step are loaded into the crucible model cavity, and then the crucible model cavity is placed on a vibrating operating platform for 3 to 5 minutes to complete the filling operation. After sealing the mold, it is placed in the high-pressure oil chamber of the cold isostatic press, and the pressure is maintained at 150 to 220 MPa for 5 to 15 minutes, and the crucible preform is taken out and demolded to obtain a crucible preform.

[0038] S5: Dry the crucible preform obtained in step 4 in a natural environment for 24 to 48 hours, and then place it in an oven at 100 to 150° C. and dry it for 12 to 18 hours.

[0039] S6: Place the green crucible obtained in step 5 in a sintering furnace, heat it to a final sintering temperature of 1600-2000°C at a heating rate of 0.5-5°C / min, keep it warm for 20-50 hours, cool it with the furnace, complete the plastic removal and sintering process, and obtain the novel large-sized porous yttria crucible for smelting titanium-aluminum alloy. The prepared porous yttria crucible can melt highly active refractory metals such as titanium-aluminum alloys within a temperature range of 1500-2100°C.

[0040] Example 1

[0041] The large-sized porous yttria crucible for titanium-aluminum alloy smelting is prepared by cold isostatic pressing. The specific steps are as follows:

[0042] S1: yttrium oxide Y2O3 fused powder with a particle size of 1-2 mm, yttrium oxide Y2O3 fused powder with a particle size of 60-300 mesh, and yttrium oxide Y2O3 fused powder with a mass ratio of 4:3:3, and add them into a mixing device in the order of particle size from large to small, add zirconium oxide ZrO2 grinding balls, and mill at a speed of 120 r / min for 3-5 hours, preferably 4 hours, to obtain a mixed powder;

[0043] S2: preparing a polyvinyl alcohol (PVA) binder solution; the ratio of polyvinyl alcohol (PVA) to yttrium oxide powder is 1:15, and the concentration of the polyvinyl alcohol (PVA) binder solution is 8%;

[0044] S3: The mixed powder and the binder are mixed and fully ground to make them uniform, and sieved to obtain coarse granules with a uniform particle size of about 10 meshes, and the granules are aged and stored for 24 hours;

[0045] S4: the yttrium oxide Y2O3 particles prepared in step 3 are loaded into the crucible mold cavity, and then the crucible mold cavity is placed on a vibrating operating platform for 5 minutes to complete the filling operation, and after the mold is sealed, it is placed in the high-pressure oil chamber of the cold isostatic press, and the pressure is maintained at 180 MPa for 5 minutes, and the crucible preform is taken out and demolded to obtain a crucible preform;

[0046] S5: drying the crucible preform obtained in step 4 in a natural environment for 24 hours, and then drying it in an oven at 100° C. for 16 hours;

[0047] S6: placing the crucible green body obtained in step 5 in a sintering furnace, heating it to a final sintering temperature of 1850°C at a heating rate of 0.5°C / min, keeping it at that temperature for 25 hours, cooling it with the furnace, completing the plastic removal and sintering process, and obtaining the novel large-sized porous yttrium oxide crucible for smelting titanium-aluminum alloy. The size of the crucible is 133 mm in outer diameter and 232 mm in height. 46 The Al alloy can be melted repeatedly for 7 times before the crucible fails.

[0048] Example 2

[0049] The large-sized porous yttria crucible for titanium-aluminum alloy smelting is prepared by cold isostatic pressing. The specific steps are as follows:

[0050] S1: 2-3 mm yttrium oxide Y2O3 fused powder, 60-300 mesh yttrium oxide Y2O3 fused powder, and 1-3 μm yttrium oxide Y2O3 fused powder are mixed in a ratio of 3:4:3, and added into a mixing device in descending order of particle size, and after adding zirconium oxide ZrO2 grinding balls, the mixture is ball-milled at a speed of 120 rpm for 4 hours to obtain a mixed powder;

[0051] S2: preparing a polyvinyl alcohol (PVA) binder solution; the ratio of polyvinyl alcohol (PVA) to yttrium oxide powder is 1:20, and the concentration of the polyvinyl alcohol (PVA) binder solution is 8%;

[0052] S3: After mixing the mixed powder and the binder, grind them thoroughly to make them evenly mixed, sieve them to obtain coarse granules with a uniform particle size of about 6 mesh, and store the granules for aging for 24 hours;

[0053] S4: the yttrium oxide Y2O3 particles prepared in step 3 are loaded into the crucible mold cavity, and then the crucible mold cavity is placed on a vibration operating platform for 10 minutes to complete the filling operation, and after the mold is sealed, it is placed in the high-pressure oil chamber of the cold isostatic press, and the pressure is maintained at 160 MPa for 5 minutes, and the crucible preform is taken out and demolded to obtain a crucible preform;

[0054] S5: drying the crucible preform obtained in step 4 in a natural environment for 24 hours, and then drying it in an oven at 120° C. for 12 hours;

[0055] S6: placing the crucible green body obtained in step 5 in a sintering furnace, heating it to a final sintering temperature of 1750°C at a heating rate of 1.5°C / min, keeping it warm for 30 hours, cooling it with the furnace, completing the plastic removal and sintering process, and obtaining the novel large-sized porous yttrium oxide crucible for smelting titanium-aluminum alloy. The size of the crucible is 124 mm in outer diameter and 218 mm in height. 46 The Al alloy can be melted repeatedly for 6 times before the crucible fails.

[0056] Experimental example: Table 1 records the data of porosity, strength and thermal cycle number (reaction thermal shock resistance) of yttrium oxide Y2O3 crucible at sintering temperature of 1750°C and different proportions of yttrium oxide Y2O3 particles of three different particle sizes.

[0057]

[0058]

[0059] During the use of the crucible, the pores can be used as pre-reserved gaps to help dissipate thermal elastic strain energy, inhibit crack expansion, and improve the service life of the crucible, that is, the thermal shock resistance. During each use of the crucible, the strength of the crucible is rapidly lost due to rapid cooling and heating, and the crucible must have a certain strength to resist the strength loss during multiple furnace smelting processes. Generally speaking, the higher the porosity, the lower the strength, and the two are opposite. However, within a certain range, the higher the porosity, the higher the strength, and the best balance between the crucible's strength and thermal shock resistance.

[0060] According to the data of the 1st to 3rd groups, when the content of yttrium oxide Y2O3 fused mixed powder with a particle size of 1 to 3 mm is 0 to 20%, it is difficult to serve as a sintering skeleton, and the overall anti-seismic performance of the crucible is poor; according to the data of the 7th to 8th groups, when the content of yttrium oxide Y2O3 fused mixed powder with a particle size of 1 to 3 mm is 50% to 60%, it is difficult to sinter and burn through, the crucible strength is low, and the thermal shock performance is very poor. According to the data of the 4th to 5th groups, when the content of yttrium oxide Y2O3 fused mixed powder with a particle size of 1 to 3 mm is 30% to 40%, among them, the porosity, strength and thermal cycle number (reaction anti-thermal shock performance) of the 4th group are the best, the anti-thermal shock performance is greatly improved, and the strength is high. The anti-thermal shock performance of the 5th group is greatly improved, and the strength is high. The content of yttrium oxide Y2O3 fused mixed powder with particle size of 1-3mm in group 6 and group 5 is both 30%-40%, but the content ratio of yttrium oxide Y2O3 fused mixed powder with the other two particle sizes is different. However, the thermal shock resistance is greatly reduced compared with groups 4 and 5, and the strength is reduced compared with both groups. Therefore, the data of groups 5 and 6 have a better balance between crucible strength and thermal shock resistance, and group 5 is the best.

[0061] Table 2 records the porosity and strength of the crucibles prepared with the ratios in Group 4 in Table 1 at different sintering temperatures.

[0062]

[0063] It can be seen from Table 2 that when the sintering temperature is 1750°C, the balance between strength and porosity is optimal.

[0064] according to Figure 4 , a is 1650℃, b is 1700℃, and c is the microscopic morphology at 1750℃. As the temperature increases, the crucible has smaller pores, denser organization, and higher strength. However, due to the introduction of 1-3mm large particles as the skeleton, the sintering performance of the crucible is relatively stable overall, the porosity and strength of the crucible are relatively balanced, and the crucibles show good thermal shock resistance. Through the technical solutions defined by the corresponding parameters of the 4th and 5th groups in Table 1, no obvious cracks appeared after 15 cycles of air cooling at 1100℃.

[0065] As described above, the present invention relates to the application field of oxide ceramic crucibles, and specifically to a method for preparing a new large-size porous yttrium oxide crucible for titanium aluminum alloy smelting with good thermal shock resistance. The yttrium oxide crucible is formed by cold isostatic pressing, and during the forming process, 0.5 to 0.8 g of polyvinyl alcohol (PVA) additive is doped into every 10 g of yttrium oxide Y2O3. The purity of yttrium oxide Y2O3 used for cold isostatic pressing is 99.5%, and three different sizes of yttrium oxide Y2O3 particles or micron fine powders are used, and yttrium oxide Y2O3 of different sizes are added in a reasonable order and ratio. The large-sized porous yttria crucible of the present invention can be used at a temperature of up to 1500-2100°C, and as a device for vacuum melting of titanium-aluminum alloys under this temperature environment, the inner surface of the crucible does not participate in the reaction of active metals or alloys. On the basis of improving the purity of the alloy melt, it has the characteristics of good thermal shock resistance and ultra-high service life, and has the advantages of simple preparation process, low preparation cost, good mechanical properties and thermal shock resistance, etc.

[0066] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a porous yttrium oxide crucible, It is characterized in that include S1. 30% to 40% by mass of yttrium oxide Y with a particle size of 1 to 3 mm 2 O 3 Electrofusion mixed powder, 20% to 40% yttrium oxide Y with a particle size of 60 to 300 mesh 2 O 3 Electrofusion mixed powder and 20% to 30% yttrium oxide Y with a particle size of 1 to 3 μm 2 O 3 The electrofused mixed powder is added to the grinding balls for ball milling, the ball milling speed is 120-150r / min, and the mixing time is 3-5h; S2. Adding a binder polyvinyl alcohol PVA solution to the mixed powder after ball milling, mixing and grinding, granulating, then sieving to obtain coarse granules, and aging; S3. The coarse granules obtained after aging are cold isostatically pressed to obtain a crucible preform; S4. Drying the preformed crucible to obtain a green crucible; S5. The green crucible is sintered at 1650° C. to 1750° C. and cooled to room temperature to obtain the porous yttrium oxide crucible.

2. The method for preparing a porous yttrium oxide crucible according to claim 1, It is characterized in that In step S1, by mass, 1-3 mm yttrium oxide Y 2 O 3 Electrofusion mixed powder: 60-300 mesh yttrium oxide Y 2 O 3 Electrofusion mixed powder: 1~3μm yttrium oxide Y 2 O 3 Electrofused mixed powder = 4:3:3 or 3:4:

3.

3. The method for preparing a porous yttria crucible according to claim 2, It is characterized in that The green crucible was sintered at 1750°C.

4. The method for preparing a porous yttrium oxide crucible according to claim 1, It is characterized in that In step S2, by mass, polyvinyl alcohol PVA: mixed powder = 1:20, the concentration of polyvinyl alcohol PVA binder solution is configured at 8%, the mixed powder and the binder polyvinyl alcohol PVA are fully mixed and ground to make the particle size uniformly distributed, and coarse granules with a particle size of 6 to 10 mesh are obtained by sieving, and the coarse granules are aged and stored for 24 hours.

5. The method for preparing a porous yttrium oxide crucible according to claim 1, It is characterized in that In step S3, the coarse granules obtained after the aging treatment are loaded into the crucible model cavity, and then the crucible model cavity is placed on a vibrating operating platform for 3 to 5 minutes to complete the filling operation. After the mold is sealed, it is placed in the high-pressure oil chamber of the cold isostatic press and maintained at a pressure of 150 to 220 MPa for 5 to 15 minutes. The crucible preform is taken out and demolded to obtain a crucible preform.

6. The method for preparing a porous yttrium oxide crucible according to claim 1, It is characterized in that In step S4, the crucible preform is dried in a natural environment for 24 hours to 48 hours, and then placed in an oven at 100 to 150° C. to dry for 12 to 18 hours.

7. The method for preparing a porous yttrium oxide crucible according to claim 1, It is characterized in that In step S5, the crucible green body is placed in a sintering furnace, and the temperature is increased to a final sintering temperature of 1650°C to 1750°C at a heating rate of 0.5 to 5°C / min. After being kept warm for 20 to 50 hours, the crucible is cooled with the furnace to complete the plastic removal and sintering process to obtain the large-sized porous yttrium oxide crucible for smelting the titanium-aluminum alloy.

8. The method for preparing a porous yttrium oxide crucible according to claim 2, It is characterized in that Yttrium oxide Y with a particle size of 1 to 3 mm in step S1 2 O 3 The fused mixed powder is composed of yttrium oxide Y with a particle size of 1 to 3 mm. 2 O 3 Preparation of electrofused powder mixing; Yttrium oxide Y with particle size of 60-300 mesh 2 O 3 The fused mixed powder is composed of yttrium oxide Y with a particle size of 60 to 300 mesh. 2 O 3 Preparation of electrofused powder mixing; Yttrium oxide Y with particle size 1~3μm 2 O 3 The fused mixed powder is composed of yttrium oxide Y with a particle size of 1 to 3 μm. 2 O 3 Preparation of electrofused powder mixing; Among them, three different particle sizes of yttrium oxide Y 2 O 3 The fused mixed powder is sequentially added into grinding balls for ball milling; Among them, the porous yttrium oxide crucible is a large-sized crucible with an outer diameter of 124 to 133 mm and a height of 218 to 232 mm.

9. A crucible prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the crucible according to claim 9 for smelting titanium-aluminum alloy.

Images