CN112170776B - Reinforced stable yttrium oxide slurry and preparation method thereof - Google Patents
Reinforced stable yttrium oxide slurry and preparation method thereof Download PDFInfo
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- CN112170776B CN112170776B CN201910601628.XA CN201910601628A CN112170776B CN 112170776 B CN112170776 B CN 112170776B CN 201910601628 A CN201910601628 A CN 201910601628A CN 112170776 B CN112170776 B CN 112170776B
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- yttrium oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
Abstract
The invention provides a reinforced stable yttrium oxide slurry and a preparation method thereof, wherein the slurry comprises the following components in parts by weight: 10-15 parts of yttrium oxide glue; 3-8 parts of organic latex; 3-8 parts of deionized water; 70-80 parts of yttrium oxide powder, 1-5 parts of stabilizer and 0.03-0.05 part of wetting agent; 0.03-0.05 part of defoaming agent; the stabilizer is zirconia and/or alumina powder. According to the invention, the stability of the slurry is successfully improved by adding the stabilizer into the yttrium sol + yttrium oxide powder slurry with highest inertia and worst stability, and the bonding strength of the slurry is improved by adding the organic binder, so that the yttrium oxide slurry with high strength and stable performance is prepared, and the high-quality yttrium oxide surface layer formwork with smooth and complete inner surface is further obtained and is used for precision casting of titanium alloy, high-temperature alloy and zirconium alloy investment.
Description
Technical Field
The invention belongs to the technical field of alloy casting, and particularly relates to a reinforced stable yttrium oxide slurry and a preparation method thereof.
Background
High-temperature alloy, titanium alloy and zirconium alloy are high-strength corrosion-resistant metal materials widely used in the fields of aerospace, marine ships and the like, and are generally subjected to near-net shape by precision investment casting. Because the material, especially titanium alloy, contains a large amount of high chemical activity metal elements such as titanium, aluminum, zirconium, niobium, rare earth and the like, the material is easy to react with a crucible and a mould shell in the alloy smelting and mould filling process, a dirt layer is formed on the surface of a casting, oxide impurities are generated inside the casting, the yield of the casting is reduced, and the mechanical property of the material is damaged. Therefore, developing a high-inertia and stable coating slurry technology aiming at high-chemical activity metal elements such as titanium, aluminum, zirconium, niobium, rare earth and the like is used for the inner surface coating of a crucible and a mould shell, and reducing chemical reaction is a main development direction in the field and has very important significance.
The yttrium oxide surface layer formwork is the ceramic formwork with the highest inertia in the titanium alloy precision casting field at present, and technologies such as nanometer silica sol + yttrium oxide powder slurry, zirconium acetate + yttrium oxide slurry, yttrium sol + yttrium oxide powder slurry and the like are developed internationally and successively, but the defects that a contaminated layer is too thick, the service life of the material is short, the performance is unstable and industrialization cannot be achieved exist. The yttrium oxide glue and yttrium oxide powder slurry has the highest technical inertia and good development prospect, but due to the characteristics of low strength, easy gelatinization, instability, poor manufacturability and the like, the slurry has short service life, the prepared surface layer of the die shell is easy to crack and redissolve, the phenomena of powder falling, peeling, falling and the like occur on the inner surface of the die shell, the product quality is difficult to control, and the quality of castings such as titanium alloy and the like is seriously influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides yttria slurry with stable process, high strength and good manufacturability and a preparation method thereof, wherein the stability of the slurry is improved by adding a stabilizer into yttrium sol and yttria powder slurry with highest inertia and worst stability, and the bonding strength of the slurry is improved by adding an organic bonding agent, so that the yttria slurry with high strength and stable performance is prepared, and further, a high-quality yttria surface layer formwork with a smooth and complete inner surface is obtained and is used for precision investment casting of titanium alloy, high-temperature alloy and zirconium alloy.
The technical scheme of the invention is as follows:
the reinforced stable yttrium oxide slurry comprises the following components in parts by weight:
10-15 parts of yttrium oxide glue; 3-8 parts of organic latex; 3-8 parts of deionized water; 70-80 parts of yttrium oxide powder, 1-5 parts of stabilizer and 0.03-0.05 part of wetting agent; 0.03-0.05 part of defoaming agent; the stabilizer is zirconia and/or alumina powder. If the content of each component is outside this range, the components are difficult to be blended together.
The particle size of the yttrium oxide powder is 325 meshes; the particle size of the stabilizer is 325 meshes.
The invention also provides a preparation method of the reinforced stable yttrium oxide slurry, which comprises the following steps:
s1, uniformly mixing water and a wetting agent to form a solution A;
s2 adding yttrium oxide glue and organic latex into the solution A successively, and mixing uniformly to form a solution B;
s3, gradually adding yttrium oxide powder and a stabilizer into the solution B, and uniformly mixing to form a solution C;
s4, adding a defoaming agent into the solution C, and stirring for 24-48 h to obtain the reinforced stable yttrium oxide slurry.
In step S3, yttrium oxide powder and the stabilizer may be mixed and then added to solution B, or may be added to solution B at the same time in proportion.
"gradually adding" in step S3 means slowly adding while stirring to ensure that the formed solution C does not cake, and if the adding speed is too high, the solution C will cake.
The reinforced stable yttrium oxide slurry can be judged by measuring parameters such as viscosity, plate weight and the like, and if the measured value is stable, the reinforced stable yttrium oxide slurry is obtained.
The components and the feeding sequence have the mutual synergistic effect, the latex can strengthen the bonding strength of the yttrium oxide glue, the stabilizer can relieve the hydrolysis reaction of yttrium oxide powder, the wetting agent and the defoaming agent are favorable for eliminating bubbles and improving the wetting capacity of slurry, but if the feeding sequence is changed, certain gelling reaction can be generated to change the property of the slurry. On the basis of the above, other components can be added to customize the slurry with different functions.
The invention also provides a reinforced yttrium oxide surface layer formwork which is obtained by reinforcing stable yttrium oxide slurry, and the inner surface of the reinforced yttrium oxide surface layer formwork is smooth and complete and is used for precision investment casting of titanium alloy, high-temperature alloy and zirconium alloy.
The invention has the advantages that the yttrium sol and yttrium oxide powder slurry is a system with highest inertia and worst stability, the fusion method is the most difficult, and if the method is not controlled properly, the components are difficult to be fused effectively. The components and the charging sequence have the mutual synergistic effect, so that the organic latex and the stabilizing agent are successfully introduced into an yttrium sol and yttrium oxide powder slurry system to prepare the reinforced stable yttrium oxide slurry. The problem of insufficient strength of yttrium oxide slurry is well solved by adding the reinforcing agent organic latex, the strength of the slurry is improved after the organic latex is added, the strength of the coating is correspondingly improved after the coating is prepared into a crucible or a mold shell inner surface coating, the problems of easy cracking and redissolution of the surface layer and the like are well solved, and the manufacturability is improved; the latex can be decomposed and volatilized in the roasting process of the crucible and the mould shell, and cannot react with the molten liquid to form a dirt layer; by adding the stabilizer, the solubility of the yttrium oxide in water is effectively reduced, the hydrolysis of the yttrium oxide is reduced, the stability of the slurry is greatly improved, and the service life of the slurry can reach 15-30 days; the strength and stability of the yttrium oxide slurry are greatly improved by adding the reinforcing agent and the stabilizing agent, so that the manufacturability and operability are greatly enhanced, and the industrial capacity is achieved; because the reinforced stable yttrium oxide slurry is adopted, the inner surfaces of the coated crucible and the mold shell are very smooth and complete, do not drop slag and have high inertia, the problem of oxide inclusion of a casting can be greatly reduced, the comprehensive performance of the alloy is improved, the product quality and the yield are improved, and the method can be used for investment casting of materials such as titanium alloy, high-temperature alloy, zirconium alloy and the like. Because the reinforced stable yttrium oxide slurry mainly comprises yttrium oxide glue and yttrium oxide powder, the calcined die shell has high inertia, the surface contamination layer is only 0.02-0.05 mm, and sand blasting can be eliminated, so the reinforced stable yttrium oxide slurry has high inertia, is very beneficial to improving the surface quality of a casting, and simultaneously improves the mold filling capacity and the yield of the casting, and is particularly suitable for near-net forming of a thin-wall part of high-activity metal. The invention strengthens and stabilizes the yttria slurry, prolongs the service life of the slurry by multiple times, almost eliminates a surface contamination layer, greatly improves the product quality and performance, greatly reduces the burdening and polishing workload, greatly improves the yield, saves the working procedure and labor, and has obvious cost reduction and efficiency improvement on investment casting of titanium alloy, high-temperature alloy and zirconium alloy.
Detailed Description
Example 1
A preparation method of reinforced stable yttrium oxide slurry comprises the following steps:
s1, 8 parts of water and 0.03 part of wetting agent are uniformly mixed to form a solution A;
s2, sequentially adding 10 parts of yttrium oxide glue and 8 parts of organic latex into the solution A, and uniformly stirring to form a solution B;
s3, gradually adding a mixture of 80 parts of yttrium oxide powder and 5 parts of zirconium oxide powder into the solution B, and uniformly stirring to form a solution C;
s4, adding 0.03 part of defoaming agent into the solution C, stirring for 24 hours, and obtaining the reinforced stable yttrium oxide slurry after measuring viscosity and plate weight and measuring stability.
The reinforced stable yttrium oxide slurry has no crack when being dried, and the next layer coated on the reinforced stable yttrium oxide slurry is not redissolved; the lifetime is increased from several days (conventional yttria gel + yttria powder slurry system lifetime) to 15 days.
Example 2
A preparation method of reinforced stable yttrium oxide slurry comprises the following steps:
s1, mixing 5 parts of water and 0.04 part of wetting agent uniformly to form a solution A;
s2, adding 13 parts of yttrium oxide glue and 5 parts of organic latex into the solution A successively, and stirring uniformly to form a solution B;
s3, gradually adding 75 parts of yttrium oxide powder and 3 parts of aluminum oxide (yttrium oxide powder and zirconium oxide are added in proportion at the same time) into the solution B, and uniformly stirring to form a solution C;
s4, adding 0.02 part of defoaming agent into the solution C, stirring for 36 h, and obtaining the reinforced stable yttrium oxide slurry after measuring viscosity and plate weight and measuring stability.
The reinforced stable yttrium oxide slurry has no crack when being dried, and the next layer coated on the reinforced stable yttrium oxide slurry is not redissolved; the lifetime is increased from several days (conventional yttria gel + yttria powder slurry system lifetime) to 15 days.
Example 3
A preparation method of reinforced stable yttrium oxide slurry comprises the following steps:
s1, mixing 3 parts of water and 0.05 part of wetting agent uniformly to form a solution A;
s2, adding 15 parts of yttrium oxide glue and 3 parts of organic latex into the solution A successively, and stirring uniformly to form a solution B;
s3, gradually adding 70 parts of yttrium oxide powder and 2 parts of zirconium oxide (yttrium oxide powder and zirconium oxide are added simultaneously in proportion) into the solution B, and uniformly stirring to form a solution C;
s4, adding 0.05 part of defoaming agent into the solution C, stirring for 48 hours, and obtaining the reinforced stable yttrium oxide slurry after measuring viscosity and plate weight and measuring stability.
The reinforced stable yttrium oxide slurry has no crack when being dried, and the next layer coated on the reinforced stable yttrium oxide slurry is not redissolved; the lifetime is increased from several days (conventional yttria gel + yttria powder slurry system lifetime) to 15 days.
Comparative example 1 (not according to the invention)
Example 1 was repeated, but the organic latex was modified to be a silica sol, and gelation and precipitation occurred, failing to obtain the present invention.
Comparative example 2 (not according to the invention)
Although example 1 was repeated, the order of steps S1 and S3 was changed, and it was difficult to fuse the powder with the yttria gel and the organic latex, and the present invention could not be obtained.
Claims (4)
1. A stabilized yttria slurry, characterized by: the coating comprises the following components in parts by weight:
10-15 parts of yttrium oxide glue; 3-8 parts of organic latex; 3-8 parts of deionized water; 70-80 parts of yttrium oxide powder, 1-5 parts of stabilizer and 0.03-0.05 part of wetting agent; 0.03-0.05 part of defoaming agent; the stabilizer is zirconia and/or alumina powder.
2. A stabilized yttria slurry of claim 1, wherein: the particle size of the yttrium oxide powder is 325 meshes; the particle size of the stabilizer is 325 meshes.
3. A method of preparing a stabilized yttria slurry of claim 1, wherein: the method comprises the following steps:
s1, uniformly mixing water and a wetting agent to form a solution A;
s2 adding yttrium oxide glue and organic latex into the solution A successively, and mixing uniformly to form a solution B;
s3, gradually adding yttrium oxide powder and a stabilizer into the solution B, and uniformly mixing to form a solution C;
s4, adding a defoaming agent into the solution C, and stirring for 24-48 h to obtain the stable yttrium oxide slurry.
4. An yttria-coated formwork, comprising: the stabilized yttria slurry of claim 1, wherein said yttria face layer form has a smooth, integral interior surface for use in high temperature alloy investment casting.
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