CN107186172A - A kind of painting hanging method of titanium-base alloy investment casting shell backing layer - Google Patents
A kind of painting hanging method of titanium-base alloy investment casting shell backing layer Download PDFInfo
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- CN107186172A CN107186172A CN201710376256.6A CN201710376256A CN107186172A CN 107186172 A CN107186172 A CN 107186172A CN 201710376256 A CN201710376256 A CN 201710376256A CN 107186172 A CN107186172 A CN 107186172A
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- layer
- wax
- mullite
- slurry
- pattern component
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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
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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
Abstract
A kind of painting hanging method of titanium-base alloy investment casting shell backing layer, make use of the characteristics of intensity of the strength ratio mullite shell of corundum shell is high, and shell backing layer is prepared using corundum layer and the compound method being coated with of mullite layer.The present invention solves that the mullite investment shell intensity that is widely used at present is not enough, combined unstable problem with surface layer there is provided a kind of simple to operate, functional, is applicable to the shell backing layer painting hanging method of titanium-base alloy precision-investment casting.
Description
Technical field
The invention belongs to titanium-base alloy Investment casting technology field, and in particular to one kind is used for titanium-base alloy model casting type
The painting hanging method of shell backing layer.
Background technology
Titanium is a kind of function admirable, has the metallic element of strategic importance in development national economy and safety, is referred to as
" the 3rd metal ", " space metal ", " marine metal " emerged after steel, aluminium.The density of titanium or titanium alloy is small, specific strength
High, operating temperature range is wider, and with excellent corrosion stability, since being developed from 1950s, due to aviation boat
The demand in its field, titanium alloy industry is having the development advanced by leaps and bounds over more than 60 years.
Titanium alloy is difficult to cause its usage amount to receive certain limitation, model casting with parts manufacturing cost height
Technology can produce the casting of Near net shape, and metal loss is greatly reduced, and improve stock utilization, shorten the production cycle,
Some complex-shaped parts can also be prepared, therefore model casting is a kind of remarkable in economical benefits for titanium alloy component
Manufacture method.Oxide top layer ceramic shell technique is most widely used in the smart casting technology of titanium investment both at home and abroad at present
A kind of forming technology, casting strength that its Foundry Production comes out is high, finish is good, clear-cut, price is relatively cheap, and can
Casting large complex thin wall castings.
Titanium-base alloy fusing point is high, density is small, can be reacted in the molten state with almost all of refractory material, to type
The requirement of shell performance is high.Current titanium-base alloy casting shell widely uses mullite as the refractory material of backing layer, but its intensity
Deficiency, exclusive use tends not to meet requirement of the antigravity casting to shell.In addition, when the wax-pattern of casting passes through Quick-forming
When prepared by mode, high polymer material is often used, its dewaxing is more difficult, shell easily ftractures in dewaxing process.Therefore,
In view of the above-mentioned problems, needing to find, a kind of intensity is higher, but does not influence the shell of gas permeability.
Disclose a kind of based on composite fibre enhancing investment pattern precision casting in Publication No. CN103639359A innovation and creation
The preparation method of shell, it can not only strengthen investment shell intensity using ceramics and nylon composite fiber-reinforced precision investment casting mould case,
Improve shell gas permeability, and solve traditional handicraft and prepare shell to ensure its intensity and increasing shell thickness causes ventilation
Property difference the problem of；For producing the overall precision castings of high-melting-point labyrinth, it is micro- that nylon organic fiber is formed after Baking
Hole can improve shell gas permeability, and ceramic inorganic fiber is retained in shell and strengthens investment shell intensity.The invention is in guarantee type
Investment shell intensity is enhanced on the basis of the certain wall thickness of shell, shell gas permeability is improved, so as to pour the metal of precision investment casting mould case
Note is had laid a good foundation.
A kind of raising titanium-aluminium alloy hot investment casting oxidation is disclosed in Publication No. CN105290313A innovation and creation
The method of thing ceramic shell deformability, methods described is that polypropylene silk, graphite powder are added in precision casting shell preparation process,
Burnt by high-temperature roasting polyacrylic fibres, graphite powder, so as to form hole in shell, improve shell deformability.Specifically
Ground, be precision casting shell preparation process preparation slurry, be coated with shell step, polyacrylic fibres are wound in oxide type
Shell surface, using the backing layer slurry hanging of graphitiferous powder.The invention effectively improves the deformability of shell, so that effectively reduction casting
There is the tendency of hot and cold crackle in process of setting in part.
A kind of antigravity casting highly-breathable is disclosed in Publication No. CN101927321A innovation and creation, it is high-strength
The preparation method of ceramic shell is spent, its technical process is：Prepare backing layer slurry, the coating of backing layer first, the coating of backing layer second,
Add heatproof carbon fiber rope：Second layer backing layer coating dry 20~24 hours after use specification for 12K~24K/ strands, monofilament it is straight
Module is wound by the heatproof carbon fiber rope in 6 μm of footpath, and the winding spacing of heatproof carbon fiber rope is 1~3mm, backing layer third layer and
The shell coating of follow-up backing layer, untill layer 6 or layer 7 are expected in painting.Advantage is, ceramic shell gas permeability, intensity
Reach expected level；The antigravity casting experiment carried out using the shell shows that the TiAl alloy booster turbine for having 70% fills
Type is complete.
These methods are to add the pore forming materials such as organic fiber, graphite during being coated with of shell to improve shell
Gas permeability, adds refractory fibre or winds shell to improve the intensity of shell with it in the slurry.These methods add behaviour
Make difficulty, or can increase the viscosity of slurry, cause coating thick.In addition, corundum based refractory materials self structure is fine and close, hardness
High, fracture strength is higher, and thermal expansion is small and uniform, is often used as high-alloy steel, various special heat-resisting alloys and Mg alloy castings
Shell refractory material processed.Therefore the intensity that can use it to improve titanium-base alloy investment casting shell is considered.
The content of the invention
To overcome, mullite investment shell intensity present in prior art is not enough, unstable deficiency is combined with surface layer,
Invention proposes a kind of painting hanging method of titanium-base alloy investment casting shell backing layer.
The detailed process of the present invention is as follows：
Step 1, corundum layer slurry is prepared.Described corundum layer slurry is, using schmigel as refractory matter, to be made with Ludox
For bonding agent；The refractory matter：Binding agent=2.3~2.5：1, described ratio is mass ratio.The schmigel of 200 mesh is added
In Ludox, stir 1 hour, obtain corundum layer slurry；In the Ludox, SiO2Mass percent account for Ludox system
30% or 40%.
Step 2, it is coated with first layer corundum layer.The wax-pattern component for being coated with yittrium oxide surface layer is immersed into the corundum layer slurry
Carry out being stained with slurry in material, stop after 6s and take out.The wax-pattern component is constantly rotated, corundum layer slurry unnecessary on the wax-pattern component is fallen in control
Material.In the emergy of wax-pattern assembly surface one layer of 30~50 mesh of spreading；The wax-pattern component that spreading has emergy is placed on dry
Dried 12 hours on dry frame, complete the preparation of the first layer corundum layer of wax-pattern component.
Step 3, it is coated with second layer corundum layer.The process of repeat step 2, completes the system of the second layer corundum layer of wax-pattern component
It is standby.
Step 4, mullite layer slurry is prepared.Described mullite layer slurry is using mullite powder as refractory matter, with silicon
Colloidal sol is used as bonding agent；The refractory matter：Bonding agent=2~2.2：1, described ratio is mass ratio.By the mullite of 200 mesh
Powder is added in Ludox, is stirred 1 hour, obtains mullite layer slurry；In the Ludox, SiO2Mass percent to account for silicon molten
The 30% of colloid system or 40%.
Step 5, it is coated with first layer mullite layer.The wax-pattern component that preparation has corundum layer is immersed in the mullite layer slurry
Carry out being stained with slurry in material, stop after 6s and take out.The wax-pattern component is constantly rotated, mullite layer slurry unnecessary on module is fallen in control；
The mullite sand of one layer of 30~50 mesh of surface spreading of the wax-pattern component, and module is placed on drying 12 hours on drying frame,
Complete the preparation of the first layer mullite layer of wax-pattern component.
Step 6, it is coated with second layer mullite layer.The wax-pattern component immersion mullite slurry for having first layer mullite layer will be prepared
Carry out being stained with slurry in material, stop after 6s and take out, constantly rotate wax-pattern component, slurry unnecessary on module is fallen in control.In the wax-pattern component
The mullite sand of one layer of 16~30 mesh of surface spreading, and module is placed on drying 12 hours on drying frame, complete wax-pattern component
Second layer mullite layer preparation.
Step 7, it is coated with third layer mullite layer.The process of repeat step 6, completes the third layer mullite layer of wax-pattern component
Prepare.
Step 8, prepare and obturage layer.Wax-pattern component is immersed in mullite slurry and carries out being stained with slurry, stops after 6s and takes out, constantly
Wax-pattern group is rotated, additional size on the wax-pattern component is fallen in control, and mullite is placed on into drying 24~36 hours on drying frame, complete
The preparation of layer is obturaged into wax-pattern component, the preparation of wax-pattern component shell is completed.
The present invention is directed to the mullite investment shell intensity deficiency being widely used at present, unstable problem is combined with surface layer,
There is provided a kind of simple to operate, functional, the shell backing layer for being applicable to titanium-base alloy precision-investment casting applies hanging method.
The technical process of the present invention needs to carry out between constant temperature and humidity, and the temperature of environment is 22~25 DEG C, and relative humidity is
40~60%, used Ludox can be SiO2Mass fraction is 30% or 40% Ludox.
Present invention utilizes this high feature of the intensity of the strength ratio mullite shell of corundum shell, using corundum layer and not
Carry out the compound method being coated with of rock layers to prepare shell backing layer.By HB 5352.4-2004《Investment casting shell method for testing performance
4th part：The measure of gas permeability》With HB 5352.1-2004《Investment casting shell method for testing performance part 1：Bending resistance is strong
The measure of degree》Method the intensity and gas permeability of shell are tested.Test result shows, mullite is used alone with tradition
Fire resistant materials are compared to prepare the method for shell backing layer, and the room temperature strength of shell increases to 3.71 by 2.77 ± 0.86MPa ±
0.33MPa, after 1000 DEG C of roastings elevated temperature strength of the shell at 1200 DEG C increase to 2.08 by 1.87 ± 0.13MPa ±
0.23MPa, the residual strength after roasting increases to 6.40 ± 0.85MPa by 4.78 ± 1.13MPa.So make the room of shell backing layer
Warm intensity improves 34%, shell is not easily susceptible to cracking in carrying and dewaxing process；Elevated temperature strength at 1200 DEG C is improved
11%, shell is not easily susceptible to cracking in casting process.Also, add after corundum layer, shell backing layer is saturating at 1200 DEG C
Gas is by 8.22 × 10-8m4/ (Nmin) is changed into 7.76 × 10-8m4/ (Nmin), gas permeability declines within 10%, breathes freely
Property is still good.
The shell backing layer prepared with the present invention is along with 2 layers of Y2O3Surface layer, overall shell is after 1000 DEG C are calcined, at 800 DEG C
Elevated temperature strength be 10.22 ± 1.80MPa, the elevated temperature strength at 1200 DEG C is 2.54 ± 0.66MPa, gas permeability is 4.73 ×
10-8m4/ (Nmin), meets requirement of the titanium-base alloy cast to shell.Also, cast practice have shown that, no matter gravitational casting or
Antigravity casting, without phenomenon of running away during cast, easily, shell surface layer adhesion is illustrated the clear shell of casting on casting
The combination of shell surface layer and backing layer is preferable.
Brief description of the drawings
Fig. 1 is the shell prepared in embodiment one.
Fig. 2 is the photo after the clear shell of Ti4822 casting poured into a mould by antigravity casting in embodiment one.
Fig. 3 is the Ti4822 I-beams casting and flaw detection situation poured into a mould in embodiment one.
Fig. 4 is the shell prepared in embodiment two.
Fig. 5 is the photo after the ZTi60 casting sandblastings poured into a mould by antigravity casting in embodiment two.
Fig. 6 is the flow chart of the present invention.
Embodiment
Embodiment one
The present embodiment is a kind of painting hanging method for titanium-base alloy investment casting shell backing layer, is entered between constant temperature and humidity
OK, the temperature of required environment is 22 DEG C, and relative humidity is 40%.
The specific implementation step of the present embodiment is as follows：
Step 1, corundum layer slurry is prepared.Using schmigel as refractory matter, bonding agent is used as using Ludox；The fire resisting
Material：Binding agent=2.4:1, described ratio is mass ratio.The schmigel of 200 mesh is added in Ludox, stirs 1 hour, obtains
To corundum layer slurry；In the Ludox, SiO2Mass percent account for the 30% of Ludox system.
Step 2, it is coated with first layer corundum layer.The wax-pattern component for being coated with yittrium oxide surface layer is immersed in step 1 and made
Carry out being stained with slurry in the corundum layer slurry got ready, stop after 6s and take out.The wax-pattern component is constantly rotated, control is fallen on the wax-pattern component
Unnecessary corundum layer slurry.In the emergy of wax-pattern assembly surface one layer of 30~50 mesh of spreading；Spreading is had to the wax of emergy
Membrane module is placed on drying frame and dried 12 hours, completes the preparation of the first layer corundum layer of wax-pattern component.
Step 3, it is coated with second layer corundum layer.The process of repeat step 2, completes the system of the second layer corundum layer of wax-pattern component
It is standby.
Step 4, mullite layer slurry is prepared.Using mullite powder as refractory matter, bonding agent is used as using Ludox；It is described resistance to
Fire material：Bonding agent=2:1, described ratio is mass ratio.The mullite powder of 200 mesh is added in Ludox, stirred 1 hour,
Obtain mullite layer slurry；In the Ludox, SiO2Mass percent account for the 30% of Ludox system.
Step 5, it is coated with first layer mullite layer.The wax-pattern component that preparation has corundum layer is immersed in the mullite layer slurry
Carry out being stained with slurry in material, stop after 6s and take out.The wax-pattern component is constantly rotated, mullite layer slurry unnecessary on module is fallen in control；
The mullite sand of one layer of 30~50 mesh of surface spreading of the wax-pattern component, and module is placed on drying 12 hours on drying frame,
Complete the preparation of the first layer mullite layer of wax-pattern component.
Step 6, it is coated with second layer mullite layer.The wax-pattern component immersion mullite slurry for having first layer mullite layer will be prepared
Carry out being stained with slurry in material, stop after 6s and take out, constantly rotate wax-pattern component, slurry unnecessary on module is fallen in control.In the wax-pattern component
The mullite sand of one layer of 16~30 mesh of surface spreading, and module is placed on drying 12 hours on drying frame, complete wax-pattern component
Second layer mullite layer preparation.
Step 7, it is coated with third layer mullite layer.The process of repeat step 6, completes the third layer mullite layer of wax-pattern component
Prepare.
Step 8, prepare and obturage layer.Wax-pattern component is immersed in mullite slurry and carries out being stained with slurry, stops after 6s and takes out, constantly
Wax-pattern group is rotated, additional size on the wax-pattern component is fallen in control, and mullite is placed on into drying 24 hours on drying frame, completes wax
Membrane module obturages the preparation of layer, completes the preparation of wax-pattern component shell.
The investment shell sample prepared using process above process, by HB 5352.4-2004《Investment casting shell performance test
The part of method the 4th：The measure of gas permeability》With HB 5352.1-2004《Investment casting shell method for testing performance part 1：It is anti-
The measure of curved intensity》Tested, the room temperature strength of shell is 3.48MPa, and elevated temperature strength at 1200 DEG C is 2.07MPa, high
Warm residual strength is 6.29MPa, and the test result of shell gas permeability at 1200 DEG C is 7.71 × 10-8m4/(N·min).With original
The performance of the shell backing layer first only prepared with mullite refractory is compared, and the room temperature strength of shell adds 26%, and high temperature is strong
Degree adds 11%, and the hot permeability of shell have dropped 6%.
ZrO is prepared for using process above process2The backing layer shell of surface layer investment casting shell, shell is dewaxing and is being calcined
During have no cracking, poured into a mould Ti4822 casting with this shell, the clear shell of casting easily, no scab defect, the shell after roasting
As shown in Figure 1, the casting after clear shell is as shown in Figure 2.In addition, the wall thickness of cast is respectively 3mm, 4mm, 5mm thick
Although Ti4822 I-beams casting is in the presence of filling, type is imperfect, does not detect crackle in the region of stress concentration of casting, this says
Clear shell has certain deformability.
Embodiment two
The present embodiment is a kind of painting hanging method for titanium-base alloy investment casting shell backing layer, is entered between constant temperature and humidity
OK, the temperature of required environment is 25 DEG C, and relative humidity is 60%.
The specific implementation step of the present embodiment is as follows：
Step 1, corundum layer slurry is prepared.Using schmigel as refractory matter, bonding agent is used as using Ludox；The fire resisting
Material：Binding agent=2.4:1, described ratio is mass ratio.The schmigel of 200 mesh is added in Ludox, stirs 1 hour, obtains
To corundum layer slurry；In the Ludox, SiO2Mass percent account for the 30% of Ludox system.
Step 2, it is coated with first layer corundum layer.The wax-pattern component for being coated with yittrium oxide surface layer is immersed in step 1 and made
Carry out being stained with slurry in the corundum layer slurry got ready, stop after 6s and take out.The wax-pattern component is constantly rotated, control is fallen on the wax-pattern component
Unnecessary corundum layer slurry.In the emergy of wax-pattern assembly surface one layer of 30~50 mesh of spreading；Spreading is had to the wax of emergy
Membrane module is placed on drying frame and dried 12 hours, completes the preparation of the first layer corundum layer of wax-pattern component.
Step 3, it is coated with second layer corundum layer.The process of repeat step 2, completes the system of the second layer corundum layer of wax-pattern component
It is standby.
Step 4, mullite layer slurry is prepared.Using mullite powder as refractory matter, bonding agent is used as using Ludox；It is described resistance to
Fire material：Bonding agent=2:1, described ratio is mass ratio.The mullite powder of 200 mesh is added in Ludox, stirred 1 hour,
Obtain mullite layer slurry；In the Ludox, SiO2Mass percent account for the 30% of Ludox system.
Step 5, it is coated with first layer mullite layer.The wax-pattern component that preparation has corundum layer is immersed in the mullite layer slurry
Carry out being stained with slurry in material, stop after 6s and take out.The wax-pattern component is constantly rotated, mullite layer slurry unnecessary on module is fallen in control；
The mullite sand of one layer of 30~50 mesh of surface spreading of the wax-pattern component, and module is placed on drying 12 hours on drying frame,
Complete the preparation of the first layer mullite layer of wax-pattern component.
Step 6, it is coated with second and third layer of mullite layer.The process of repeat step 6 twice, complete wax-pattern component the second layer and
The preparation of third layer mullite layer.
Step 7, prepare and obturage layer.Wax-pattern component is immersed in mullite slurry and carries out being stained with slurry, stops after 6s and takes out, constantly
Wax-pattern group is rotated, additional size on the wax-pattern component is fallen in control, and mullite is placed on into drying 24 hours on drying frame, completes wax
Membrane module obturages the preparation of layer, completes the preparation of wax-pattern component shell.
The investment shell sample prepared using process above process, by HB 5352.4-2004《Investment casting shell performance test
The part of method the 4th：The measure of gas permeability》With HB 5352.1-2004《Investment casting shell method for testing performance part 1：It is anti-
The measure of curved intensity》Tested, the room temperature strength of shell is 3.94MPa, and elevated temperature strength at 1200 DEG C is 2.09MPa, high
Warm residual strength is 6.52MPa, and the test result of shell gas permeability at 1200 DEG C is 7.82 × 10-8m4/(N·min).With original
The performance of the shell backing layer first only prepared with mullite refractory is compared, and the room temperature strength of shell adds 42%, and high temperature is strong
Degree adds 12%, and the hot permeability of shell have dropped 5%.
Y is prepared for using process above process2O3The backing layer shell of surface layer investment casting shell, shell is dewaxing and is being calcined
During have no cracking, poured into a mould ZTi60 casting with this shell, the clear shell of casting easily, no scab defect, the shell after roasting is such as
Shown in accompanying drawing 4, the casting after sand removal is as shown in Figure 5.
Embodiment three
The present embodiment is a kind of painting hanging method for titanium-base alloy investment casting shell backing layer, is entered between constant temperature and humidity
OK, the temperature of required environment is 24 DEG C, and relative humidity is 50%.
The specific implementation step of the present embodiment is as follows：
Step 1, corundum layer slurry is prepared.Using schmigel as refractory matter, bonding agent is used as using Ludox；The fire resisting
Material：Binding agent=2.4:1, described ratio is mass ratio.The schmigel of 200 mesh is added in Ludox, stirs 1 hour, obtains
To corundum layer slurry；In the Ludox, SiO2Mass percent account for the 40% of Ludox system.
Step 2, it is coated with first layer corundum layer.The wax-pattern component for being coated with yittrium oxide surface layer is immersed in step 1 and made
Carry out being stained with slurry in the corundum layer slurry got ready, stop after 6s and take out.The wax-pattern component is constantly rotated, control is fallen on the wax-pattern component
Unnecessary corundum layer slurry.In the emergy of wax-pattern assembly surface one layer of 30~50 mesh of spreading；Spreading is had to the wax of emergy
Membrane module is placed on drying frame and dried 12 hours, completes the preparation of the first layer corundum layer of wax-pattern component.
Step 3, it is coated with second layer corundum layer.The process of repeat step 2, completes the system of the second layer corundum layer of wax-pattern component
It is standby.
Step 4, mullite layer slurry is prepared.Using mullite powder as refractory matter, bonding agent is used as using Ludox；It is described resistance to
Fire material：Bonding agent=2:1, described ratio is mass ratio.The mullite powder of 200 mesh is added in Ludox, stirred 1 hour,
Obtain mullite layer slurry；In the Ludox, SiO2Mass percent account for the 40% of Ludox system.
Step 5, it is coated with first layer mullite layer.The wax-pattern component that preparation has corundum layer is immersed in the mullite layer slurry
Carry out being stained with slurry in material, stop after 6s and take out.The wax-pattern component is constantly rotated, mullite layer slurry unnecessary on module is fallen in control；
The mullite sand of one layer of 30~50 mesh of surface spreading of the wax-pattern component, and module is placed on drying 12 hours on drying frame,
Complete the preparation of the first layer mullite layer of wax-pattern component.
Step 6, it is coated with second layer mullite layer.The wax-pattern component immersion mullite slurry for having first layer mullite layer will be prepared
Carry out being stained with slurry in material, stop after 6s and take out, constantly rotate wax-pattern component, slurry unnecessary on module is fallen in control.In the wax-pattern component
The mullite sand of one layer of 16~30 mesh of surface spreading, and module is placed on drying 12 hours on drying frame, complete wax-pattern component
Second layer mullite layer preparation.
Step 7, it is coated with third layer mullite layer.The process of repeat step 6, completes the third layer mullite layer of wax-pattern component
Prepare.
Step 8, prepare and obturage layer.Wax-pattern component is immersed in mullite slurry and carries out being stained with slurry, stops after 6s and takes out, constantly
Wax-pattern group is rotated, additional size on the wax-pattern component is fallen in control, and mullite is placed on into drying 24 hours on drying frame, completes wax
Membrane module obturages the preparation of layer, completes the preparation of wax-pattern component shell.
Example IV
The present embodiment is a kind of painting hanging method for titanium-base alloy investment casting shell backing layer, and specific implementation step is such as
Under：
Step 1, corundum layer slurry is prepared.Using schmigel as refractory matter, bonding agent is used as using Ludox；The fire resisting
Material：Binding agent=2.4:1, described ratio is mass ratio.The schmigel of 200 mesh is added in Ludox, stirs 1 hour, obtains
To corundum layer slurry；In the Ludox, SiO2Mass percent account for the 40% of Ludox system.
Step 2, it is coated with first layer corundum layer.The wax-pattern component for being coated with yittrium oxide surface layer is immersed in step 1 and made
Carry out being stained with slurry in the corundum layer slurry got ready, stop after 6s and take out.The wax-pattern component is constantly rotated, control is fallen on the wax-pattern component
Unnecessary corundum layer slurry.In the emergy of wax-pattern assembly surface one layer of 30~50 mesh of spreading；Spreading is had to the wax of emergy
Membrane module is placed on drying frame and dried 12 hours, completes the preparation of the first layer corundum layer of wax-pattern component.
Step 3, it is coated with second layer corundum layer.The process of repeat step 2, completes the system of the second layer corundum layer of wax-pattern component
It is standby.
Step 4, mullite layer slurry is prepared.Using mullite powder as refractory matter, bonding agent is used as using Ludox；It is described resistance to
Fire material：Bonding agent=2:1, described ratio is mass ratio.The mullite powder of 200 mesh is added in Ludox, stirred 1 hour,
Obtain mullite layer slurry；In the Ludox, SiO2Mass percent account for the 40% of Ludox system.
Step 5, it is coated with first layer mullite layer.The wax-pattern component that preparation has corundum layer is immersed in the mullite layer slurry
Carry out being stained with slurry in material, stop after 6s and take out.The wax-pattern component is constantly rotated, mullite layer slurry unnecessary on module is fallen in control；
The mullite sand of one layer of 30~50 mesh of surface spreading of the wax-pattern component, and module is placed on drying 12 hours on drying frame,
Complete the preparation of the first layer mullite layer of wax-pattern component.
Step 6, it is coated with second and third layer of mullite layer.The process of repeat step 6 twice, complete wax-pattern component the second layer and
The preparation of third layer mullite layer.
Step 7, prepare and obturage layer.Wax-pattern component is immersed in mullite slurry and carries out being stained with slurry, stops after 6s and takes out, constantly
Wax-pattern group is rotated, additional size on the wax-pattern component is fallen in control, and mullite is placed on into drying 24 hours on drying frame, completes wax
Membrane module obturages the preparation of layer, completes the preparation of wax-pattern component shell.
Claims (3)
1. a kind of painting hanging method of titanium-base alloy investment casting shell backing layer, it is characterised in that carried out between constant temperature and humidity, environment
Temperature be 22~25 DEG C, relative humidity be 40~60%；
The present invention detailed process be：
Step 1, corundum layer slurry is prepared；
Step 2, it is coated with first layer corundum layer；The wax-pattern component for being coated with yittrium oxide surface layer is immersed in the corundum layer slurry
Slurry is stained with progress, stops after 6s and takes out；The wax-pattern component is constantly rotated, corundum layer slurry unnecessary on the wax-pattern component is fallen in control；
In the emergy of wax-pattern assembly surface one layer of 30~50 mesh of spreading；The wax-pattern component that spreading has emergy is placed on drying frame
Upper drying 12 hours, completes the preparation of the first layer corundum layer of wax-pattern component；
Step 3, it is coated with second layer corundum layer；The process of repeat step 2, completes the preparation of the second layer corundum layer of wax-pattern component；
Step 4, mullite layer slurry is prepared；
Step 5, it is coated with first layer mullite layer；The wax-pattern component that preparation has corundum layer is immersed in the mullite layer slurry
Slurry is stained with progress, stops after 6s and takes out；The wax-pattern component is constantly rotated, mullite layer slurry unnecessary on module is fallen in control；In the wax
The mullite sand of one layer of 30~50 mesh of surface spreading of membrane module, and module is placed on drying 12 hours on drying frame, complete
The preparation of the first layer mullite layer of wax-pattern component；
Step 6, it is coated with second layer mullite layer；Preparation is had in the wax-pattern component immersion mullite slurry of first layer mullite layer
Slurry is stained with progress, stops after 6s and takes out, and constantly rotates wax-pattern component, and slurry unnecessary on module is fallen in control；In the wax-pattern assembly surface
The mullite sand of one layer of 16~30 mesh of spreading, and module is placed on drying frame dried 12 hours, complete the of wax-pattern component
The preparation of two layers of mullite layer；
Step 7, it is coated with third layer mullite layer；The process of repeat step 6, completes the system of the third layer mullite layer of wax-pattern component
It is standby；
Step 8, prepare and obturage layer；Wax-pattern component is immersed in mullite slurry and carries out being stained with slurry, stops after 6s and takes out, constantly rotate
Additional size on the wax-pattern component is fallen in wax-pattern group, control, and mullite is placed on into drying 24~36 hours on drying frame, completes wax
Membrane module obturages the preparation of layer, completes the preparation of wax-pattern component shell.
2. the painting hanging method of titanium-base alloy investment casting shell backing layer as claimed in claim 1, it is characterised in that described corundum
Layer slurry is, using schmigel as refractory matter, bonding agent to be used as using Ludox；The refractory matter：Binding agent=2.3~2.5：1,
Described ratio is mass ratio；The schmigel of 200 mesh is added in Ludox, stirs 1 hour, obtains corundum layer slurry；It is described
In Ludox, SiO2Mass percent account for the 30% or 40% of Ludox system.
3. the painting hanging method of titanium-base alloy investment casting shell backing layer as claimed in claim 1, it is characterised in that described does not come
Rock layers slurry is, using mullite powder as refractory matter, bonding agent to be used as using Ludox；The refractory matter：Bonding agent=2~2.2：
1, described ratio is mass ratio；The mullite powder of 200 mesh is added in Ludox, stirred 1 hour, mullite layer slurry is obtained
Material；In the Ludox, SiO2Mass percent account for the 30% or 40% of Ludox system.
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| CN114178486A (en) * | 2021-12-14 | 2022-03-15 | 贵阳航发精密铸造有限公司 | Shell for improving sand adhesion on surface of cast high-temperature alloy and preparation method thereof |
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| CN114178486B (en) * | 2021-12-14 | 2024-04-09 | 贵阳航发精密铸造有限公司 | Shell for improving sand sticking on surface of high-temperature alloy after casting and preparation method thereof |
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