A ceramic crucible suitable for casting titanium and titanium alloy fast melting furnace and preparation method thereof

Abstract

The present invention provides a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces and a preparation method thereof, the preparation method comprising the following steps: S1, using zirconia ceramic fiber, a dispersant and a binder to prepare a zirconia ceramic fiber crucible under the action of a mold and a vacuum suction filter; S2, coating the inside of the zirconia ceramic fiber crucible with a highly inert titanium liquid corrosion-resistant coating to obtain a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces. The preparation method of the ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces described in the present invention has the following characteristics: first, the produced ceramic crucible has high inertness and can react with titanium and titanium alloy liquids in a relatively short period of time without obvious chemical reaction, which effectively solves the problem of crucible corrosion in vacuum fast induction melting furnaces for small titanium and titanium alloy castings; second, it can realize rapid manufacturing of titanium and titanium alloy castings, with high production efficiency and low cost, effectively ensuring the rapid mass production of titanium and titanium alloy castings.

Description

Technical Field

[0001] The invention relates to the field of titanium and titanium alloy casting, and in particular to a ceramic crucible suitable for titanium and titanium alloy fast melting furnace casting and a preparation method thereof. Background Art

[0002] At present, titanium and titanium alloy casting generally adopts vacuum consumable electrode arc shell furnace and water-cooled copper crucible vacuum rapid induction melting furnace for casting. Vacuum consumable electrode arc shell furnace is suitable for large titanium alloy castings. At the same time, due to the difficulty of preheating the mold shell, this furnace is suitable for pouring thick and large titanium and titanium alloy castings. However, for thin-walled small titanium and titanium alloy castings, it is very easy to have problems such as mold shell cracking, incomplete filling, solidification cracking, surface cold shut, low production efficiency, and high production cost. Although the water-cooled copper crucible vacuum induction melting furnace has a high alloy superheat and is suitable for the preparation of small titanium and titanium alloy castings, the single melting amount is small and its efficiency is low, which cannot meet the production of large batches of titanium and titanium alloy castings efficiently and at low cost. Using vacuum rapid induction melting furnace to cast titanium and titanium alloy castings is the main development direction in this field, and the ceramic crucible suitable for vacuum rapid induction melting furnace for titanium and titanium alloy restricts the development of this forming method.

[0003] Titanium and titanium alloy melts react chemically with almost all materials due to their high activity. The melting and pouring of titanium and titanium alloys in ceramic crucibles has always been a technical bottleneck in the industry and also a research focus of the industry. The vacuum fast-melting induction furnace can melt the alloy in a very short time due to its fast melting speed, which greatly improves the production efficiency of titanium and titanium alloy castings. At the same time, it also effectively shortens the chemical reaction time between titanium and titanium alloy melts and crucibles. Although the requirements for the use of ceramic crucibles have been reduced, the zirconium fiber ceramic crucibles currently used still react chemically with titanium and titanium alloy liquids to varying degrees. There are no ceramic crucibles suitable for vacuum induction rapid casting of titanium and titanium alloy castings on the market.

[0004] Highly inert ceramic crucibles used in vacuum rapid induction melting furnaces for casting titanium and titanium alloy castings are an obstacle to the rapid casting of titanium and titanium alloy castings.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to propose a method for preparing a ceramic crucible suitable for fast melting furnace casting of titanium and titanium alloys, so as to solve the problem that the zirconium fiber ceramic crucible currently used in the prior art still undergoes chemical reactions with titanium and titanium alloy liquids to varying degrees, and there are no ceramic crucibles suitable for vacuum induction rapid casting of titanium and titanium alloy castings on the market.

[0007] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0008] A method for preparing a ceramic crucible for casting titanium and titanium alloy fast melting furnaces, the method comprising the following steps:

[0009] S1. Using zirconia ceramic fiber, dispersant and binder, a zirconia ceramic fiber crucible is prepared under the action of a mold and a vacuum filter;

[0010] S2. A highly inert titanium liquid corrosion-resistant coating is coated inside the zirconia ceramic fiber crucible to obtain a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces.

[0011] The method for preparing a ceramic crucible suitable for casting in a fast-melting furnace for titanium and titanium alloys described in the present invention has the following advantages: first, the produced ceramic fiber crucible has high inertness and can react with titanium and titanium alloy liquid in a relatively short period of time without obvious chemical reaction, thereby effectively solving the problem of crucible corrosion in a vacuum fast induction melting furnace for small titanium and titanium alloy castings; second, it can realize rapid manufacturing of titanium and titanium alloy castings with high production efficiency and low cost, thereby effectively ensuring rapid mass production of titanium and titanium alloy castings.

[0012] Further, step S1 includes the following steps:

[0013] S11, slurry preparation: weighing zirconia ceramic fiber and dispersant, wherein the weight ratio of the dispersant is 0.4% of the zirconia fiber, and fully stirring and mixing the zirconia ceramic fiber and the dispersant to form a mixed liquid; weighing water and a binder, wherein the weight ratio of water to the binder is 6:1, and fully stirring and mixing the water and the binder to form a slurry; then adding the mixed liquid to the slurry, and fully stirring and mixing to obtain a slurry;

[0014] S12, preparing a wet zirconia ceramic fiber crucible: fixing a mold and a suction filter pipeline of a vacuum suction filter, wherein the mold includes an outer mold, an inner mold and a base, ensuring that the bottom of the inner mold and the bottom of the outer mold are in contact at a sealed position, turning on the vacuum suction filter, and allowing the slurry to pass through the outer mold and enter between the inner mold and the outer mold under the action of the vacuum suction filter, while at the same time extracting the slurry inside the inner mold through the suction filter pipeline, and adsorbing the zirconia ceramic fiber with a binder on the inner mold, and gradually depositing between the inner mold and the outer mold to form a wet zirconia ceramic fiber crucible;

[0015] S13. Preparing a zirconia ceramic fiber crucible: taking out the wet zirconia ceramic fiber crucible, placing the taken out wet zirconia ceramic fiber crucible on a fixed rod, putting the fixed rod and the wet zirconia ceramic fiber crucible into an oven for drying, taking out after drying, and grinding it to a desired size after cooling to obtain a zirconia ceramic fiber crucible.

[0016] Furthermore, in step S11, the slurry density is 260-300 g / 100 ml.

[0017] Furthermore, in step S11, the dispersant is polyacrylamide.

[0018] Furthermore, in step S11, the binder is silica sol, and the silicon oxide content in the silica sol is 30%.

[0019] Furthermore, in step S11, the zirconia ceramic fiber includes the following components in percentage by mass: 15-20% zirconium oxide, 1-2% yttrium oxide, 45-50% aluminum oxide, and 30-40% silicon oxide.

[0020] Furthermore, in step S12, the diameter of the hole of the outer mold is greater than the diameter of the hole of the inner mold.

[0021] Furthermore, in step S13, the drying temperature is 170-200°C, and the drying time is 17-24 hours.

[0022] Further, step S2 includes the following steps:

[0023] S21. Preparing a highly inert titanium liquid corrosion resistant coating: weighing fused yttrium oxide powder and silica sol, wherein the silicon oxide content in the silica sol is 30%, and the weight ratio of the fused yttrium oxide powder to the silica sol is 5:1, and stirring and fully mixing the fused yttrium oxide powder and the silica sol to prepare a highly inert titanium liquid corrosion resistant coating;

[0024] S22, surface coating: evenly coating the prepared highly inert titanium liquid corrosion resistant coating on the inner surface of the zirconia ceramic fiber crucible, and then drying to obtain a ceramic crucible suitable for titanium and titanium alloy fast melting furnace casting.

[0025] In a second aspect of the present invention, a ceramic crucible suitable for use in a fast-melting furnace for casting titanium and titanium alloys is provided. The ceramic crucible suitable for use in a fast-melting furnace for casting titanium and titanium alloys is prepared using the above-mentioned method for preparing a ceramic crucible suitable for use in a fast-melting furnace for casting titanium and titanium alloys.

[0026] The present invention proposes a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces and a preparation method. Compared with the prior art, the ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces and a preparation method described in the present invention have the following beneficial effects:

[0027] The present invention discloses a method for preparing a ceramic crucible for use in a fast-melting furnace for casting titanium and titanium alloys. The produced ceramic crucible has high inertness and can react with titanium and titanium alloy liquid in a relatively short period of time without undergoing obvious chemical reactions. The crucible can be used in a vacuum fast induction melting furnace for casting titanium and titanium alloy castings, and the problem of crucible corrosion in a vacuum fast induction melting furnace for casting small titanium and titanium alloy castings is effectively solved.

[0028] The method for preparing a ceramic crucible suitable for casting titanium and titanium alloys in a fast-melting furnace described in the present invention can realize the rapid manufacture of titanium and titanium alloy castings, has high production efficiency and low cost, and effectively ensures the rapid mass production of titanium and titanium alloy castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnace according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the installation structure of a mold and a suction filter pipeline for a ceramic crucible for casting titanium and titanium alloy fast melting furnace according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic structural diagram of an outer mold of a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces according to an embodiment of the present invention;

[0032] Figure 4 It is a partial structural schematic diagram of an outer mold of a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnace according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic structural diagram of an inner mold of a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces according to an embodiment of the present invention;

[0034] Figure 6 This is a partial structural schematic diagram of an inner mold of a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the base structure of a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces according to an embodiment of the present invention;

[0036] Figure 8 This is a surface energy spectrum analysis diagram of a titanium alloy ingot prepared using a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces according to an embodiment of the present invention;

[0037] Fig. 9 The present invention is a scanning electron microscope image of a titanium alloy ingot prepared by using a ceramic crucible suitable for casting titanium and titanium alloys in a fast melting furnace according to an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Outer mold; 2. Inner mold; 3. Base; 4. Suction filter pipeline. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The descriptions of "first", "second", etc. mentioned in the embodiments of the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0042] like Figures 1 to 7 As shown, the present invention provides a method for preparing a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces, the preparation method comprising the following steps:

[0043] S1. Using zirconia ceramic fiber, dispersant and binder, a zirconia ceramic fiber crucible is prepared under the action of a mold and a vacuum filter;

[0044] S2. A highly inert titanium liquid corrosion-resistant coating is coated inside the zirconia ceramic fiber crucible to obtain a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces.

[0045] The present invention discloses a method for preparing a ceramic crucible for casting a titanium and titanium alloy fast melting furnace, wherein step S1 and step S2 are interrelated. The method uses zirconium oxide ceramic fiber, a dispersant, and a binder to form a wet crucible under the action of an inner mold, an outer mold, and a vacuum suction filter, and prepares a zirconium oxide ceramic fiber crucible by drying and shaping. A ceramic crucible suitable for casting a titanium and titanium alloy fast melting furnace is prepared by coating the inside of the zirconium oxide ceramic fiber crucible with a highly inert titanium liquid corrosion-resistant coating; the ceramic crucible produced by the method has low cost and high production efficiency, and effectively solves the problem of crucible corrosion in a vacuum fast induction melting furnace for small titanium and titanium alloy castings. The preparation of the crucible effectively solves the problem of low production efficiency and high production cost of titanium alloy castings, and effectively ensures the rapid mass production of titanium and titanium alloy castings.

[0046] The ceramic crucible produced by this method can react with titanium and titanium alloy liquid without obvious chemical reaction in a relatively short time. The development of this ceramic crucible promotes the development of low-cost, high-quality titanium and titanium alloy castings. By using the ceramic crucible prepared by this method, small titanium and titanium alloy castings can be manufactured quickly and at low cost.

[0047] The ceramic crucible produced by the method solves the problem of the reaction between the ceramic crucible and the titanium and titanium alloy melts in a very short time. The ceramic crucible produced by the method can realize the rapid manufacture of titanium and titanium alloy castings.

[0048] Specifically, step S1 includes the following steps:

[0049] S11, slurry preparation: weighing zirconia ceramic fiber and dispersant, wherein the weight proportion of the dispersant is 0.4% of the zirconia fiber, and using a stirrer to fully stir and mix the zirconia ceramic fiber and the dispersant into a mixed liquid; weighing water and a binder, wherein the weight ratio of water to the binder is 6:1, pouring the water and the binder into a stirring slurry barrel, stirring and mixing them fully, and preparing a slurry; adding the mixed liquid into the slurry, stirring and mixing them fully to obtain a slurry;

[0050] Specifically, in step S11, the slurry density is 260-300 g / 100 ml.

[0051] If the density of the slurry is too small, the slurry will be sucked away from the holes of the inner mold 2 of the mold, resulting in low molding efficiency; if the density of the slurry is too large, the slurry cannot enter the mold.

[0052] Specifically, in step S11, the dispersant is polyacrylamide.

[0053] Specifically, in step S11, the binder is silica sol, and the silicon oxide content in the silica sol is 30%.

[0054] Specifically, in step S11, the zirconia ceramic fiber includes the following components in percentage by mass: 15-20% zirconium oxide, 1-2% yttrium oxide, 45-50% aluminum oxide, and 30-40% silicon oxide.

[0055] Specifically, in step S11, the diameter of the zirconia ceramic fiber is 10-20 μm.

[0056] S12, preparing a wet zirconia ceramic fiber crucible: fixing a mold to a suction filter pipe 4 of a vacuum suction filter, wherein the mold includes an outer mold 1, an inner mold 2 and a base 3, and ensuring that the inner mold 2 and the bottom contact portion of the outer mold 1 are sealed, turning on the vacuum suction filter, and the slurry enters between the inner mold 2 and the outer mold 1 through the outer mold 1 under the action of the vacuum suction filter, and at the same time, the slurry inside the inner mold 2 is extracted through the suction filter pipe 4, and the zirconia ceramic fiber with a binder is adsorbed on the inner mold 2, and gradually deposited between the inner mold 2 and the outer mold 1, to form a wet zirconia ceramic fiber crucible;

[0057] Specifically, the inner mold 2 is arranged on the inner side of the outer mold 1 , and the base 3 is arranged at the bottom of the outer mold 1 and the inner mold 2 .

[0058] Specifically, in step S12 , the diameter of the hole of the outer mold 1 is greater than the diameter of the hole of the inner mold 2 .

[0059] More specifically, in step S12, the diameter of the hole of the outer mold 1 is 5 mm, and the diameter of the hole of the inner mold 2 is 2 mm.

[0060] S13. Preparation of zirconia ceramic fiber crucible: remove the suction filtration pipeline 4 from the slurry, open the buckle of the outer mold 1 and the base 3, separate the outer mold 1 from the wet ceramic fiber crucible; separate the wet ceramic fiber crucible from the inner mold 2, take out the wet zirconia ceramic fiber crucible, place the taken out wet zirconia ceramic fiber crucible on a fixing rod with the same inner size as the wet zirconia ceramic fiber crucible, put the fixing rod and the wet zirconia ceramic fiber crucible into an oven for drying, take out after drying, put it on an external grinder after cooling, and grind the external shape of the zirconia ceramic fiber crucible to the required size to obtain the zirconia ceramic fiber crucible.

[0061] Specifically, in step S13, the drying temperature is 170-200°C, and the drying time is 17-24 hours.

[0062] Specifically, step S2 includes the following steps:

[0063] S21. Preparing a highly inert titanium liquid corrosion resistant coating: weighing fused yttrium oxide powder and silica sol, wherein the silicon oxide content in the silica sol is 30%, and the weight ratio of the fused yttrium oxide powder to the silica sol is 5:1, and stirring and fully mixing the fused yttrium oxide powder and the silica sol to prepare a highly inert titanium liquid corrosion resistant coating;

[0064] S22, surface coating: evenly coating the prepared surface coating slurry on the inner surface of the zirconia ceramic fiber crucible, and then drying to obtain a ceramic crucible suitable for titanium and titanium alloy fast melting furnace casting.

[0065] Specifically, in step S21, the fused yttrium oxide powder includes the following components in percentage by mass: 95% yttrium oxide and 5% zirconium oxide.

[0066] Specifically, in step S21, the fused yttrium oxide powder is 325 mesh.

[0067] In step S2, the high inertness titanium liquid corrosion resistant coating paint is made of fused yttrium oxide powder and silica sol, the silicon oxide content in the silica sol is 30%, the weight ratio of the fused yttrium oxide powder to the silica sol is 5:1, and the fused yttrium oxide powder includes the following components in mass percentage: 95% yttrium oxide and 5% zirconium oxide; these characteristics are interrelated so that the high inertness titanium liquid corrosion resistant coating has high inertness on the one hand; on the other hand, the high inertness titanium liquid corrosion resistant coating has good adhesion.

[0068] Specifically, in step S22, the drying is carried out in a constant temperature and humidity workshop for 24 to 30 hours. The temperature of the constant temperature and humidity workshop is 21 to 25° C., and the humidity of the constant temperature and humidity workshop is 40 to 60%.

[0069] Example 1

[0070] This embodiment provides a method for preparing a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces, the preparation method comprising the following steps:

[0071] S1. Using zirconia ceramic fiber, dispersant and binder, a zirconia ceramic fiber crucible is prepared under the action of a mold and a vacuum filter;

[0072] S2. A highly inert titanium liquid corrosion-resistant coating is coated inside the zirconia ceramic fiber crucible to obtain a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces.

[0073] Specifically, step S1 includes the following steps:

[0074] S11, slurry preparation: weighing zirconia ceramic fiber and dispersant, wherein the weight proportion of the dispersant is 0.4% of the zirconia fiber, and using a stirrer to fully stir and mix the zirconia ceramic fiber and the dispersant into a mixed liquid; weighing water and a binder, wherein the weight ratio of water to the binder is 6:1, pouring the water and the binder into a stirring slurry barrel, stirring and mixing them fully, and preparing a slurry; adding the mixed liquid into the slurry, stirring and mixing them fully to obtain a slurry;

[0075] Specifically, in step S11, the slurry density is 260 g / 100 ml.

[0076] If the slurry density is too small, the slurry will be sucked out of the holes of the inner mold of the mold, resulting in low molding efficiency; if the slurry density is too large, the slurry cannot enter the mold.

[0077] Specifically, in step S11, the dispersant is polyacrylamide.

[0078] Specifically, in step S11, the binder is silica sol, and the silicon oxide content in the silica sol is 30%.

[0079] Specifically, in step S11, the zirconia ceramic fiber includes the following components in percentage by mass: 18% zirconium oxide, 1.5% yttrium oxide, 47% aluminum oxide, and 33.5% silicon oxide.

[0080] Specifically, in step S11, the diameter of the zirconia ceramic fiber is 10-20 μm.

[0081] More specifically, in this embodiment, in step S11, the weight of the zirconia ceramic fiber is 25 kg, the weight of the dispersant polyacrylamide is 0.1 kg, the weight of water is 60 kg, and the weight of the binder silica sol is 10 kg.

[0082] S12, preparing wet zirconia ceramic fiber crucible: Figures 2 to 7 As shown, the mold is fixed to the suction filter pipeline 4 of the vacuum suction filter, the mold includes an outer mold 1, an inner mold 2 and a base 3, and the inner mold 2 and the bottom contact part of the outer mold 1 are sealed. Holes are set on the outer mold 1 and the inner mold 2, and the vacuum suction filter is turned on. The slurry is sucked into the outer mold 1 through the suction filter pipeline 4 under the action of the vacuum suction filter and enters between the inner mold 2 and the outer mold 1. At the same time, the slurry inside the inner mold 2 is extracted through the suction filter pipeline 4, and the zirconia ceramic fiber with a binder is adsorbed on the outside of the inner mold 2, and gradually deposited between the inner mold 2 and the outer mold 1 to form a wet zirconia ceramic fiber crucible;

[0083] Specifically, in step S12 , the diameter of the hole of the outer mold 1 is greater than the diameter of the hole of the inner mold 2 .

[0084] More specifically, in this embodiment, in step S12, the diameter of the hole of the outer mold 1 is 5 mm, and the diameter of the hole of the inner mold 2 is 2 mm.

[0085] S13. Preparation of zirconia ceramic fiber crucible: remove the suction filtration pipeline 4 from the slurry, open the buckle of the outer mold 1 and the base 3, separate the outer mold 1 from the wet ceramic fiber crucible; separate the wet ceramic fiber crucible from the inner mold 2, take out the wet zirconia ceramic fiber crucible, place the taken out wet zirconia ceramic fiber crucible on a fixing rod with the same inner size as the wet zirconia ceramic fiber crucible, put the fixing rod and the wet zirconia ceramic fiber crucible into an oven for drying, take out after drying, put it on an external grinder after cooling, and grind the external shape of the zirconia ceramic fiber crucible to the required size to obtain the zirconia ceramic fiber crucible.

[0086] Specifically, in step S13, the drying temperature is 200° C., and the drying time is 17 hours.

[0087] Specifically, step S2 includes the following steps:

[0088] S21. Preparing a highly inert titanium liquid corrosion resistant coating: weighing fused yttrium oxide powder and silica sol, wherein the silicon oxide content in the silica sol is 30%, and the weight ratio of the fused yttrium oxide powder to the silica sol is 5:1, and stirring and fully mixing the fused yttrium oxide powder and the silica sol to prepare a highly inert titanium liquid corrosion resistant coating;

[0089] S22, surface coating: evenly coating the prepared surface coating slurry on the inner surface of the zirconia ceramic fiber crucible, and then drying to obtain a ceramic crucible suitable for titanium and titanium alloy fast melting furnace casting.

[0090] Specifically, in step S21, the fused yttrium oxide powder includes the following components in percentage by mass: 95% yttrium oxide and 5% zirconium oxide.

[0091] Specifically, in step S21, the fused yttrium oxide powder is 325 mesh.

[0092] Specifically, in step S22, the drying is carried out in a constant temperature and humidity workshop for 24 hours. The temperature of the constant temperature and humidity workshop is 21-25°C, and the humidity of the constant temperature and humidity workshop is 40-60%.

[0093] More specifically, in this embodiment, in step S21, the weight of the fused yttrium oxide powder is 10 kg, and the weight of the silica sol is 2 kg.

[0094] Example 2

[0095] In this embodiment, different from the embodiment 1,

[0096] Specifically, in step S11, the slurry density is 280 g / 100 ml.

[0097] Specifically, in step S11, the zirconia ceramic fiber includes the following components in percentage by mass: 19% zirconium oxide, 1% yttrium oxide, 50% aluminum oxide, and 30% silicon oxide.

[0098] Specifically, in step S13, the drying temperature is 190° C., and the drying time is 22 hours.

[0099] Specifically, in step S22, the drying time is 26 hours.

[0100] More specifically, in this embodiment, in step S11, the weight of the zirconia ceramic fiber is 50 kg, the weight of the dispersant polyacrylamide is 0.2 kg, the weight of water is 120 kg, and the weight of the binder silica sol is 20 kg.

[0101] More specifically, in this embodiment, in step S21, the weight of the fused yttrium oxide powder is 20 kg, and the weight of the silica sol is 4 kg.

[0102] Example 3

[0103] In this embodiment, different from the embodiment 1,

[0104] Specifically, in step S11, the slurry density is 300 g / 100 ml.

[0105] Specifically, in step S11, the zirconia ceramic fiber includes the following components in percentage by mass: 13% zirconium oxide, 2% yttrium oxide, 45% aluminum oxide, and 40% silicon oxide.

[0106] Specifically, in step S13, the drying temperature is 170° C., and the drying time is 24 hours.

[0107] Specifically, in step S22, the drying time is 30 hours.

[0108] Example 4

[0109] This embodiment provides a ceramic crucible suitable for casting titanium and titanium alloys in a fast melting furnace. The ceramic crucible suitable for casting titanium and titanium alloys in a fast melting furnace is prepared using the above-mentioned method for preparing a ceramic crucible suitable for casting titanium and titanium alloys in a fast melting furnace.

[0110] The ceramic crucibles suitable for casting in a fast melting furnace for titanium and titanium alloys prepared in Examples 1 to 3 were placed in a vacuum rapid induction melting furnace to cast titanium and titanium alloy castings. It was found that they were able to react with the titanium and titanium alloy liquid in a relatively short period of time without any obvious chemical reaction, thereby achieving rapid manufacturing of titanium and titanium alloy castings.

[0111] Taking the ceramic crucible suitable for titanium and titanium alloy fast melting furnace casting prepared in Example 1 as an example, it is placed in a vacuum fast induction melting furnace to cast a titanium alloy ingot, and the surface energy spectrum analysis of the cast titanium alloy ingot is performed. The results are shown in FIG. Figure 8 and Table 1. At the same time, the thickness of the surface α layer of the titanium alloy ingot was detected by scanning electron microscopy. Fig. 9 .

[0112] like Figure 8 As shown in Table 1, in the surface energy spectrum analysis diagram of the titanium alloy ingot, the main components were found to be Al, Ti and V, and the main components of the ceramic crucible, yttrium and zirconium, were not found on the surface, indicating that the ceramic crucible did not chemically react with the titanium liquid.

[0113] like Fig. 9 As shown in the figure, the thickness of the α layer on the surface of the titanium alloy ingot in contact with the ceramic crucible is 58.46μm, which is very thin. The thinner the α layer, the more stable the ceramic crucible is in the presence of titanium liquid, which further indicates that the ceramic crucible has no obvious chemical reaction with the titanium liquid.

[0114] Table 1

[0115]

[0116] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A method for preparing a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces, characterized in that: The preparation method comprises the following steps: S1. Using zirconia ceramic fiber, dispersant and binder, a zirconia ceramic fiber crucible is prepared under the action of a mold and a vacuum filter; S2, coating the inside of the zirconia ceramic fiber crucible with a highly inert titanium liquid corrosion resistant coating to obtain a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces; The dispersant is polyacrylamide, and the binder is silica sol; The zirconia ceramic fiber includes the following components by mass percentage: 15-20% zirconium oxide, 1-2% yttrium oxide, 45-50% aluminum oxide, and 30-40% silicon oxide; Step S1 includes the following steps: S11, slurry preparation: weighing zirconia ceramic fiber and dispersant, wherein the weight ratio of the dispersant is 0.4% of the zirconia fiber, and fully stirring and mixing the zirconia ceramic fiber and the dispersant to form a mixed liquid; weighing water and a binder, wherein the weight ratio of water to the binder is 6:1, and fully stirring and mixing the water and the binder to form a slurry; then adding the mixed liquid to the slurry, and fully stirring and mixing to obtain a slurry; S12, preparing a wet zirconia ceramic fiber crucible: fixing a mold to a suction filter pipe (4) of a vacuum suction filter, the mold comprising an outer mold (1), an inner mold (2) and a base (3), ensuring that the bottom of the inner mold (2) and the bottom of the outer mold (1) are in contact at a sealed position, turning on the vacuum suction filter, and allowing the slurry to pass through the outer mold (1) under the action of the vacuum suction filter and enter between the inner mold (2) and the outer mold (1), while at the same time extracting the slurry from the inner mold (2) through the suction filter pipe (4), and allowing the zirconia ceramic fiber with a binder to be adsorbed on the inner mold (2), and gradually deposited between the inner mold (2) and the outer mold (1), thereby forming a wet zirconia ceramic fiber crucible; S13. Preparing a zirconia ceramic fiber crucible: taking out the wet zirconia ceramic fiber crucible, placing the taken out wet zirconia ceramic fiber crucible on a fixed rod, putting the fixed rod and the wet zirconia ceramic fiber crucible into an oven for drying, taking out after drying, and grinding it to a desired size after cooling to obtain a zirconia ceramic fiber crucible.

2. The method for preparing a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnace according to claim 1, characterized in that: In step S11, the slurry density is 260-300 g / 100 ml.

3. The method for preparing a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnace according to claim 1, characterized in that: In step S11, the silicon oxide content in the silica sol is 30%.

4. The method for preparing a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnace according to claim 1, characterized in that: In step S12, the diameter of the hole of the outer mold (1) is greater than the diameter of the hole of the inner mold (2).

5. The method for preparing a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnace according to claim 1, characterized in that: In step S13, the drying temperature is 170-200°C, and the drying time is 17-24 hours.

6. The method for preparing a ceramic crucible suitable for casting titanium and titanium alloy fast melting furnace according to claim 1, characterized in that: Step S2 includes the following steps: S21. Preparing a highly inert titanium liquid corrosion resistant coating: weighing fused yttrium oxide powder and silica sol, wherein the silicon oxide content in the silica sol is 30%, and the weight ratio of the fused yttrium oxide powder to the silica sol is 5:1, and stirring and fully mixing the fused yttrium oxide powder and the silica sol to prepare a highly inert titanium liquid corrosion resistant coating; S22, surface coating: evenly coating the prepared highly inert titanium liquid corrosion resistant coating on the inner surface of the zirconia ceramic fiber crucible, and then drying to obtain a ceramic crucible suitable for titanium and titanium alloy fast melting furnace casting.

7. A ceramic crucible suitable for casting titanium and titanium alloy fast melting furnaces, characterized in that: The ceramic crucible suitable for casting titanium and titanium alloys in a fast-melting furnace is prepared using the preparation method for a ceramic crucible suitable for casting titanium and titanium alloys in a fast-melting furnace as described in any one of claims 1 to 6.

Images