CN107900286B - A kind of fused quartz ceramic shell preparation method - Google Patents

A kind of fused quartz ceramic shell preparation method Download PDF

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CN107900286B
CN107900286B CN201711259611.8A CN201711259611A CN107900286B CN 107900286 B CN107900286 B CN 107900286B CN 201711259611 A CN201711259611 A CN 201711259611A CN 107900286 B CN107900286 B CN 107900286B
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shell
slurry
fused quartz
ceramic shell
wax
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CN107900286A (en
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曾洪
伍林
张松泉
杨功显
杨照宏
巩秀芳
赵代银
何建
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DEC Dongfang Turbine Co Ltd
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DEC Dongfang Turbine Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Glass Melting And Manufacturing (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The invention discloses a kind of fused quartz ceramic shell preparation methods, including the following steps: step 1. carries out shell processed on wax-pattern with fused silica material, until completing the last layer shell；Slurry seal is carried out using paraffin latexes；The fused quartz ceramic shell made is put into dewaxing kettle and dewaxes by step 2.；The fused quartz ceramic shell shove charge roasting that dewaxing is completed, burn off remnants wax material；Roasting fused quartz ceramic shell is put into the coarse dispersion system of cristobalite fine powder by step 3., carries out immersion treatment；Step 4. takes out soaked fused quartz ceramic shell from the coarse dispersion system of cristobalite fine powder, dry to finished product.The structural strength of ceramic shell when the present invention can effectively reduce the wall thickness of ceramic shell and effectively and reliably enhance high temperature alloy casting, is conducive to stablize, reliably improves the Forming Quality for being poured casting with it.

Description

A kind of fused quartz ceramic shell preparation method
Technical field
The present invention relates to melted module precise casting technology, the preparation method of specifically a kind of fused quartz ceramic shell is special It is not suitable for use as the conjuncted blade hot investment casting molding of gas turbine.
Background technique
In investment precision casting technology, to prevent ceramic shell from bleed-out or generation occurs in high-temperature alloy material casting Bulging problem, needs to enhance the structural strength of ceramic shell, and common technical measures are in a manner of increasing the ceramic shell number of plies It is realized to increase ceramic shell thickness.
However, the enhancing technical measures of above-mentioned ceramic shell structural strength are easy to make between the adjacent parts in ceramic shell Adhesion is generated, this is especially become apparent with the hot investment casting of concatermer casting molding, such as certain gas turbine turbines is more Join the hot investment casting molding of guide vane, it is shown in Figure 1.
Adhesion phenomenon between the ceramic shell adjacent parts of precision-investment casting, pole are unfavorable for adhesion portion when casting Position heat dissipation, cooling, thus thermal center problem easy to form, this just makes the casting of moulding by casting be easy to produce shrinkage cavity defect, and then leads Cause forming technique difficulty is big, scrappage is high, forming cost is high, very impracticable.
Summary of the invention
Technical purpose of the invention is: for above-mentioned precision-investment casting to the particularity of ceramic shell technical requirements and The deficiencies in the prior art, providing a kind of can be effectively reduced ceramic shell wall thickness, avoid between adjacent parts on ceramic shell Stick together phenomenon, and can effectively and reliably enhance the vitreous silica pottery of ceramic shell structural strength when high temperature alloy casting Porcelain shell preparation method.
The present invention realizes its technical purpose the technical scheme adopted is that a kind of fused quartz ceramic shell preparation method, The preparation method includes the following steps:
Step 1. carries out shell processed on wax-pattern with fused silica material, until completing the last layer shell；Using paraffin water Lotion carries out slurry seal；
The fused quartz ceramic shell made is put into dewaxing kettle and dewaxes by step 2.；The melting that dewaxing is completed Quartz-ceramics shell shove charge roasting, burn off remnants wax material；
Roasting fused quartz ceramic shell is put into the coarse dispersion system of cristobalite fine powder by step 3., is carried out Immersion treatment；
Step 4. takes out soaked fused quartz ceramic shell from the coarse dispersion system of cristobalite fine powder, dry To finished product.
One of preferably, vitreous silica shell obtained is up to six layers on the wax-pattern in step 1.Further , vitreous silica shell obtained is five layers on the wax-pattern, specifically it is made according to following detailed step:
1. mixes the formula ratio that 280~320 mesh white alundum powders and silica solution are 3.3~3.7:1 in mass ratio to step It closes uniformly, 1# slurry is made；
The formula ratio that 180~220 mesh fused quartz powders and silica solution are 2.3~2.7:1 in mass ratio is uniformly mixed, is made Obtain 2# slurry；
2. immerses wax-pattern in 1# slurry to step, is uniformly stained with one layer of 1# slurry in wax pattern surface；
When the 1# slurry on wax-pattern does not freely descend drop, 80~120 mesh white fused alumina sand are uniformly sprinkled in pulp layer；
Step 3. the wax-pattern of step 2. is placed in the environment that temperature is 22~24 DEG C, humidity is 55~65% dry 6~ 12h completes the production of first layer shell；
4. immerses the shell of step 3. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 50~100 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
Step 5. the shell of step 4. is placed in the environment that temperature is 22~24 DEG C, humidity is 35~45% dry 4~ 8h completes the production of second layer shell；
Step 6. using step shell 5. as matrix, sequentially repeatedly step 4. with step 5., complete third layer shell system Make；
7. immerses the shell of step 6. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 30~50 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
Step 8. the shell of step 7. is placed in the environment that temperature is 22~24 DEG C, humidity is 35~45% dry 4~ 8h completes the production of the 4th stratotype shell；
Step 9. using step shell 8. as matrix, sequentially repeatedly step 7. with step 8., complete layer 5 shell system Make；
10. impregnates the shell of step 9. 30~120 seconds to step in paraffin latexes；It takes out, is 22~24 in temperature DEG C, dry 6~12h in the environment that humidity is 35~45%, complete slurry seal.
Further, the SiO in the 1# slurry and the silica solution of 2# slurry preparation2Content is respectively 25~31%.
One of preferably, the coarse dispersion system of the cristobalite fine powder in step 3 configures as follows:
It is in mass ratio first that 0.8~1.2:0.8~1.2:97.6~98.4 are matched by bleeding agent, defoaming agent and silica solution Side amount mixing and after mixing evenly, silica solution mixed liquor is made；
It is in mass ratio again 1.5~3:8.5~7 by the cristobalite fine powder of 1800~2200 mesh and silica solution mixed liquor Formula ratio is mixed and is stirred evenly, and the coarse dispersion system of cristobalite fine powder is made.
Further, the SiO in the silica solution2Content is 25~31%.
One of preferably, the fused quartz ceramic shell in step 3 is in the coarse dispersion system of cristobalite fine powder Soaking time be 30~120 seconds.
One of preferably, the drying process condition in step 4 is under the conditions of 60~120 DEG C of temperature at drying Reason 4~8 hours.
The method have the benefit that: above-mentioned preparation method is being made under the premise of not increasing the ceramic shell number of plies At fused quartz ceramic shell in penetration mode immerse cristobalite fine powder, immerse cristobalite fine powder ceramic shell be poured When high-temperature roasting in preceding preheating or casting, cristobalite fine powder can effectively improve the vitreous silica in ceramic shell by nothing Sizing state is changed into the rate and ratio of crystalline state, to improve the structural strength of fused quartz ceramic shell rapidly to meet high temperature The placingJi Shu requirement of alloy material.It can be seen that the present invention can effectively reduce ceramic shell wall thickness and effectively, The reliably structural strength of the ceramic shell when casting of enhancing high temperature alloy, i.e., obtain the melting of higher-strength with the less number of plies Quartz-ceramics shell, so that the technical issues of sticking together between the adjacent parts on ceramic shell is effectively and reliably avoided, Be conducive to stablize, reliably improve with its casting molding casting Forming Quality.In addition, the molding casting of present invention institute exists Have the characteristics that radiating rate is fast, cooling efficiency is high in cooling procedure；Moreover, vitreous silica makes to make pottery because of phase transformation in shelling Many crackles being generated on porcelain shell, in addition thinner thickness, greatly reducing shelling difficulty, shelling operation is light, easy, clear Reason, clear shell are high-efficient.
Detailed description of the invention
Fig. 1 is the structural representation of ceramic shell of certain multi-joint guide vane of gas turbine turbine in hot investment casting molding Scheme (the arrow position in figure is the position that adhesion is easy to happen between adjacent parts).
Specific embodiment
The present invention relates to melted module precise casting technology, the preparation method of specifically a kind of fused quartz ceramic shell is special It is not suitable for use as the conjuncted blade hot investment casting molding (such as shown in Fig. 1) of gas turbine.Below with multiple embodiments to this hair Bright technology contents progress is detailed, clearly demonstrates.
Embodiment 1
The present invention includes the following steps:
Step 1. carries out shell processed, tekite obtained on wax-pattern on wax-pattern according to design requirement with fused silica material English shell is five layers, until completing the last layer-i.e. layer 5 shell；Slurry seal is carried out using paraffin latexes；
Specifically, the preparation and slurry seal process of five layers of vitreous silica shell on wax-pattern, are made according to following detailed step It realizes:
Step 1. by 300 mesh white alundum powders and silica solution (SiO2Content is the formula for 30%) being in mass ratio 3.3:1 Amount is uniformly mixed, and 1# slurry is made；
By 180 mesh fused quartz powders and silica solution (SiO2Content is 30%) equal for the formula ratio mixing of 2.3:1 in mass ratio It is even, 2# slurry is made；
2. immerses wax-pattern in 1# slurry to step, is uniformly stained with one layer of 1# slurry in wax pattern surface；
When the 1# slurry on wax-pattern does not freely descend drop, 90 mesh white fused alumina sand are uniformly sprinkled in pulp layer；
3. the wax-pattern of step 2. is placed in the environment that temperature is 22 DEG C, humidity is 55% dry 10h to step by, completes the The production of one stratotype shell；
4. immerses the shell of step 3. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 70 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
5. the shell of step 4. is placed in the environment that temperature is 22 DEG C, humidity is 40% dry 6h to step by, completes second The production of stratotype shell；
Step 6. using step shell 5. as matrix, sequentially repeatedly step 4. with step 5., complete third layer shell system Make；
7. immerses the shell of step 6. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 40 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
8. the shell of step 7. is placed in the environment that temperature is 22 DEG C, humidity is 35% dry 8h to step by, completes the 4th The production of stratotype shell；
Step 9. using step shell 8. as matrix, sequentially repeatedly step 7. with step 8., complete layer 5 shell system Make；
10. impregnates the shell of step 9. 80 seconds to step in paraffin latexes；It takes out, temperature is 22 DEG C, humidity is Dry 10h, completes slurry seal in 35% environment；
The fused quartz ceramic shell made is put into dewaxing kettle by step 2., in 170 DEG C, the item of 0.7Mpa vapor It dewaxes under part；
The fused quartz ceramic shell shove charge that dewaxing is completed, roasts 2h, burn off residual wax under the conditions of 750 DEG C of temperature Material；
Roasting fused quartz ceramic shell is put into the coarse dispersion system of cristobalite fine powder by step 3., is carried out Immersion treatment；
Specifically, the coarse dispersion system of above-mentioned cristobalite fine powder configures as follows:
First by bleeding agent, defoaming agent and silica solution (SiO2Content is the formula for 30%) being in mass ratio 0.8:0.8:98.4 Amount mixing and after mixing evenly, silica solution mixed liquor is made；
The formula ratio that the cristobalite fine powder of 2000 mesh and silica solution mixed liquor are 2:8 in mass ratio is mixed and stirred again Uniformly, the coarse dispersion system of cristobalite fine powder is made；
Soaking time of the fused quartz ceramic shell in the coarse dispersion system of cristobalite fine powder is 100 seconds；
Step 4. takes out soaked fused quartz ceramic shell from the coarse dispersion system of cristobalite fine powder, 70 DEG C temperature under the conditions of dry to finished product under 5 hours drying process conditions of drying and processing.
Embodiment 2
The present invention includes the following steps:
Step 1. carries out shell processed, tekite obtained on wax-pattern on wax-pattern according to design requirement with fused silica material English shell is five layers, until completing the last layer-i.e. layer 5 shell；Slurry seal is carried out using paraffin latexes；
Specifically, the preparation and slurry seal process of five layers of vitreous silica shell on wax-pattern, are made according to following detailed step It realizes:
Step 1. by 280 mesh white alundum powders and silica solution (SiO2Content is the formula for 25%) being in mass ratio 3.6:1 Amount is uniformly mixed, and 1# slurry is made；
By 200 mesh fused quartz powders and silica solution (SiO2Content is 25%) equal for the formula ratio mixing of 2.6:1 in mass ratio It is even, 2# slurry is made；
2. immerses wax-pattern in 1# slurry to step, is uniformly stained with one layer of 1# slurry in wax pattern surface；
When the 1# slurry on wax-pattern does not freely descend drop, 100 mesh white fused alumina sand are uniformly sprinkled in pulp layer；
3. the wax-pattern of step 2. is placed in the environment that temperature is 23 DEG C, humidity is 61% dry 8h to step by, completes first The production of stratotype shell；
4. immerses the shell of step 3. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 50 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
5. the shell of step 4. is placed in the environment that temperature is 23 DEG C, humidity is 35% dry 4h to step by, completes second The production of stratotype shell；
Step 6. using step shell 5. as matrix, sequentially repeatedly step 4. with step 5., complete third layer shell system Make；
7. immerses the shell of step 6. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 30 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
8. the shell of step 7. is placed in the environment that temperature is 23 DEG C, humidity is 40% dry 6h to step by, completes the 4th The production of stratotype shell；
Step 9. using step shell 8. as matrix, sequentially repeatedly step 7. with step 8., complete layer 5 shell system Make；
10. impregnates the shell of step 9. 50 seconds to step in paraffin latexes；It takes out, temperature is 23 DEG C, humidity is Dry 6h, completes slurry seal in 40% environment；
The fused quartz ceramic shell made is put into dewaxing kettle by step 2., in 170 DEG C, the item of 0.7Mpa vapor It dewaxes under part；
The fused quartz ceramic shell shove charge that dewaxing is completed, roasts 2h, burn off residual wax under the conditions of 750 DEG C of temperature Material；
Roasting fused quartz ceramic shell is put into the coarse dispersion system of cristobalite fine powder by step 3., is carried out Immersion treatment；
Specifically, the coarse dispersion system of above-mentioned cristobalite fine powder configures as follows:
First by bleeding agent, defoaming agent and silica solution (SiO2Content is the formula for 25%) being in mass ratio 1.1:1.1:97.8 Amount mixing and after mixing evenly, silica solution mixed liquor is made；
The formula ratio that the cristobalite fine powder of 1800 mesh and silica solution mixed liquor are 1.5:8.5 in mass ratio is mixed, simultaneously again It stirs evenly, the coarse dispersion system of cristobalite fine powder is made；
Soaking time of the fused quartz ceramic shell in the coarse dispersion system of cristobalite fine powder is 70 seconds；
Step 4. takes out soaked fused quartz ceramic shell from the coarse dispersion system of cristobalite fine powder, 90 DEG C temperature under the conditions of dry to finished product under 6 hours drying process conditions of drying and processing.
Embodiment 3
The present invention includes the following steps:
Step 1. carries out shell processed, tekite obtained on wax-pattern on wax-pattern according to design requirement with fused silica material English shell is five layers, until completing the last layer-i.e. layer 5 shell；Slurry seal is carried out using paraffin latexes；
Specifically, the preparation and slurry seal process of five layers of vitreous silica shell on wax-pattern, are made according to following detailed step It realizes:
Step 1. by 320 mesh white alundum powders and silica solution (SiO2Content is the formula for 30%) being in mass ratio 3.5:1 Amount is uniformly mixed, and 1# slurry is made；
By 200 mesh fused quartz powders and silica solution (SiO2Content is 25%) equal for the formula ratio mixing of 2.5:1 in mass ratio It is even, 2# slurry is made；
2. immerses wax-pattern in 1# slurry to step, is uniformly stained with one layer of 1# slurry in wax pattern surface；
When the 1# slurry on wax-pattern does not freely descend drop, 100 mesh white fused alumina sand are uniformly sprinkled in pulp layer；
3. the wax-pattern of step 2. is placed in the environment that temperature is 23 DEG C, humidity is 60% dry 12h to step by, completes the The production of one stratotype shell；
4. immerses the shell of step 3. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 80 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
5. the shell of step 4. is placed in the environment that temperature is 23 DEG C, humidity is 40% dry 6h to step by, completes second The production of stratotype shell；
Step 6. using step shell 5. as matrix, sequentially repeatedly step 4. with step 5., complete third layer shell system Make；
7. immerses the shell of step 6. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 46 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
8. the shell of step 7. is placed in the environment that temperature is 23 DEG C, humidity is 40% dry 8h to step by, completes the 4th The production of stratotype shell；
Step 9. using step shell 8. as matrix, sequentially repeatedly step 7. with step 8., complete layer 5 shell system Make；
10. impregnates the shell of step 9. 60 seconds to step in paraffin latexes；It takes out, temperature is 23 DEG C, humidity is Dry 8h, completes slurry seal in 40% environment；
The fused quartz ceramic shell made is put into dewaxing kettle by step 2., in 170 DEG C, the item of 0.7Mpa vapor It dewaxes under part；
The fused quartz ceramic shell shove charge that dewaxing is completed, roasts 2h, burn off residual wax under the conditions of 750 DEG C of temperature Material；
Roasting fused quartz ceramic shell is put into the coarse dispersion system of cristobalite fine powder by step 3., is carried out Immersion treatment；
Specifically, the coarse dispersion system of the cristobalite fine powder configures as follows:
First by bleeding agent, defoaming agent and silica solution (SiO2Content is 30%) mixed for the formula ratio of 1:1:98 in mass ratio Close and after mixing evenly, silica solution mixed liquor is made；
The formula ratio that the cristobalite fine powder of 2000 mesh and silica solution mixed liquor are 3:7 in mass ratio is mixed and stirred again Uniformly, the coarse dispersion system of cristobalite fine powder is made；
Soaking time of the fused quartz ceramic shell in the coarse dispersion system of cristobalite fine powder is 120 seconds；
Step 4. takes out soaked fused quartz ceramic shell from the coarse dispersion system of cristobalite fine powder, 80 DEG C temperature under the conditions of dry to finished product under 4 hours drying process conditions of drying and processing.
Embodiment 4
The present invention includes the following steps:
Step 1. carries out shell processed, tekite obtained on wax-pattern on wax-pattern according to design requirement with fused silica material English shell is six layers, until completing the last layer-i.e. layer 6 shell；Slurry seal is carried out using paraffin latexes；
Specifically, the preparation and slurry seal process of six layers of vitreous silica shell on wax-pattern, are made according to following detailed step It realizes:
Step 1. by 310 mesh white alundum powders and silica solution (SiO2Content is the formula for 27%) being in mass ratio 3.4:1 Amount is uniformly mixed, and 1# slurry is made；
By 220 mesh fused quartz powders and silica solution (SiO2Content is 27%) equal for the formula ratio mixing of 2.4:1 in mass ratio It is even, 2# slurry is made；
2. immerses wax-pattern in 1# slurry to step, is uniformly stained with one layer of 1# slurry in wax pattern surface；
When the 1# slurry on wax-pattern does not freely descend drop, 120 mesh white fused alumina sand are uniformly sprinkled in pulp layer；
3. the wax-pattern of step 2. is placed in the environment that temperature is 24 DEG C, humidity is 65% dry 11h to step by, completes the The production of one stratotype shell；
4. immerses the shell of step 3. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 90 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
5. the shell of step 4. is placed in the environment that temperature is 24 DEG C, humidity is 45% dry 8h to step by, completes second The production of stratotype shell；
Step 6. using step shell 5. as matrix, sequentially repeatedly step 4. with step 5., complete third layer shell system Make；
7. immerses the shell of step 6. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 35 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
8. the shell of step 7. is placed in the environment that temperature is 24 DEG C, humidity is 45% dry 5h to step by, completes the 4th The production of stratotype shell；
Step 9. using step shell 8. as matrix, sequentially repeatedly step 7. with step 8., complete layer 5 shell system Make；
Using the shell of this step as matrix, sequentially repeatedly step 7. with step 8., complete layer 6 shell production；
10. impregnates the last shell of step 9. 30 seconds to step in paraffin latexes；Take out, temperature be 24 DEG C, it is wet Degree is 12h dry in 45% environment, completes slurry seal；
The fused quartz ceramic shell made is put into dewaxing kettle by step 2., in 170 DEG C, the item of 0.7Mpa vapor It dewaxes under part；
The fused quartz ceramic shell shove charge that dewaxing is completed, roasts 2h, burn off residual wax under the conditions of 750 DEG C of temperature Material；
Roasting fused quartz ceramic shell is put into the coarse dispersion system of cristobalite fine powder by step 3., is carried out Immersion treatment；
Specifically, the coarse dispersion system of above-mentioned cristobalite fine powder configures as follows:
First by bleeding agent, defoaming agent and silica solution (SiO2Content is the formula for 31%) being in mass ratio 1.2:1.2:97.6 Amount mixing and after mixing evenly, silica solution mixed liquor is made；
The formula ratio that the cristobalite fine powder of 2200 mesh and silica solution mixed liquor are 2:8 in mass ratio is mixed and stirred again Uniformly, the coarse dispersion system of cristobalite fine powder is made；
Soaking time of the fused quartz ceramic shell in the coarse dispersion system of cristobalite fine powder is 30 seconds；
Step 4. takes out soaked fused quartz ceramic shell from the coarse dispersion system of cristobalite fine powder, 60 DEG C temperature under the conditions of dry to finished product under 8 hours drying process conditions of drying and processing.
Embodiment 5
The present invention includes the following steps:
Step 1. carries out shell processed, tekite obtained on wax-pattern on wax-pattern according to design requirement with fused silica material English shell is five layers, until completing the last layer-i.e. layer 5 shell；Slurry seal is carried out using paraffin latexes；
Specifically, the preparation and slurry seal process of five layers of vitreous silica shell on wax-pattern, are made according to following detailed step It realizes:
Step 1. by 290 mesh white alundum powders and silica solution (SiO2Content is the formula for 31%) being in mass ratio 3.7:1 Amount is uniformly mixed, and 1# slurry is made；
By 210 mesh fused quartz powders and silica solution (SiO2Content is 31%) equal for the formula ratio mixing of 2.7:1 in mass ratio It is even, 2# slurry is made；
2. immerses wax-pattern in 1# slurry to step, is uniformly stained with one layer of 1# slurry in wax pattern surface；
When the 1# slurry on wax-pattern does not freely descend drop, 80 mesh white fused alumina sand are uniformly sprinkled in pulp layer；
3. the wax-pattern of step 2. is placed in the environment that temperature is 23 DEG C, humidity is 58% dry 6h to step by, completes first The production of stratotype shell；
4. immerses the shell of step 3. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 100 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
5. the shell of step 4. is placed in the environment that temperature is 23 DEG C, humidity is 40% dry 7h to step by, completes second The production of stratotype shell；
Step 6. using step shell 5. as matrix, sequentially repeatedly step 4. with step 5., complete third layer shell system Make；
7. immerses the shell of step 6. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 50 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
8. the shell of step 7. is placed in the environment that temperature is 23 DEG C, humidity is 40% dry 4h to step by, completes the 4th The production of stratotype shell；
Step 9. using step shell 8. as matrix, sequentially repeatedly step 7. with step 8., complete layer 5 shell system Make；
10. impregnates the shell of step 9. 120 seconds to step in paraffin latexes；It takes out, is 23 DEG C, humidity in temperature For 9h dry in 40% environment, slurry seal is completed；
The fused quartz ceramic shell made is put into dewaxing kettle by step 2., in 170 DEG C, the item of 0.7Mpa vapor It dewaxes under part；
The fused quartz ceramic shell shove charge that dewaxing is completed, roasts 2h, burn off residual wax under the conditions of 750 DEG C of temperature Material；
Roasting fused quartz ceramic shell is put into the coarse dispersion system of cristobalite fine powder by step 3., is carried out Immersion treatment；
Specifically, the coarse dispersion system of above-mentioned cristobalite fine powder configures as follows:
First by bleeding agent, defoaming agent and silica solution (SiO2Content is 30%) mixed for the formula ratio of 1:1:98 in mass ratio Close and after mixing evenly, silica solution mixed liquor is made；
The formula ratio that the cristobalite fine powder of 2100 mesh and silica solution mixed liquor are 3:7 in mass ratio is mixed and stirred again Uniformly, the coarse dispersion system of cristobalite fine powder is made；
Soaking time of the fused quartz ceramic shell in the coarse dispersion system of cristobalite fine powder is 85 seconds；
Step 4. takes out soaked fused quartz ceramic shell from the coarse dispersion system of cristobalite fine powder, 120 DEG C temperature under the conditions of dry to finished product under 4 hours drying process conditions of drying and processing.
The above various embodiments is only to illustrate the present invention, rather than its limitations；Although referring to the various embodiments described above to this hair It is bright to be described in detail, those skilled in the art should understand that: the present invention still can be to the various embodiments described above In specific technical solution modify perhaps equivalent replacement of some of the technical features and these modifications or replace It changes, the spirit and scope of the present invention that it does not separate the essence of the corresponding technical solution.

Claims (7)

1. a kind of fused quartz ceramic shell preparation method, which is characterized in that the preparation method includes the following steps:
Step 1. carries out shell processed on wax-pattern with fused silica material, until completing the last layer shell；Using paraffin latexes Carry out slurry seal；
The fused quartz ceramic shell made is put into dewaxing kettle and dewaxes by step 2.；The vitreous silica that dewaxing is completed Ceramic shell shove charge roasting, burn off remnants wax material；
Roasting fused quartz ceramic shell is put into the coarse dispersion system of cristobalite fine powder by step 3., is impregnated Processing；The coarse dispersion system of the cristobalite fine powder configures as follows:
It is in mass ratio first 0.8~1.2:0.8~1.2:97.6~98.4 formula ratio by bleeding agent, defoaming agent and silica solution Mix and after mixing evenly, silica solution mixed liquor is made；
It is again in mass ratio the formula of 1.5~3:8.5~7 by the cristobalite fine powder of 1800~2200 mesh and silica solution mixed liquor Amount is mixed and is stirred evenly, and the coarse dispersion system of cristobalite fine powder is made；
Step 4. takes out soaked fused quartz ceramic shell from the coarse dispersion system of cristobalite fine powder, it is dry at Product.
2. fused quartz ceramic shell preparation method according to claim 1, which is characterized in that made on the wax-pattern in step 1 The vitreous silica shell obtained is up to six layers.
3. fused quartz ceramic shell preparation method according to claim 2, which is characterized in that obtained molten on the wax-pattern Fused silica shell is five layers, is specifically made according to following detailed step:
1. mixes the formula ratio that 280~320 mesh white alundum powders and silica solution are 3.3~3.7:1 in mass ratio to step It is even, 1# slurry is made；
The formula ratio that 180~220 mesh fused quartz powders and silica solution are 2.3~2.7:1 in mass ratio is uniformly mixed, 2# is made Slurry；
2. immerses wax-pattern in 1# slurry to step, is uniformly stained with one layer of 1# slurry in wax pattern surface；
When the 1# slurry on wax-pattern does not freely descend drop, 80~120 mesh white fused alumina sand are uniformly sprinkled in pulp layer；
3. the wax-pattern of step 2. is placed in the environment that temperature is 22~24 DEG C, humidity is 55~65% dry 6~12h to step by, Complete the production of first layer shell；
4. immerses the shell of step 3. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 50~100 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
5. the shell of step 4. is placed in the environment that temperature is 22~24 DEG C, humidity is 35~45% dry 4~8h to step by, Complete the production of second layer shell；
Step 6. using step shell 5. as matrix, sequentially repeatedly step 4. with step 5., complete the production of third layer shell；
7. immerses the shell of step 6. in 2# slurry to step, is uniformly stained with one layer of 2# slurry on upper stratotype shell surface；
When current 2# slurry does not freely descend drop, 30~50 mesh fused quartz powders are uniformly sprinkled in Xiang Dangqian pulp layer；
8. the shell of step 7. is placed in the environment that temperature is 22~24 DEG C, humidity is 35~45% dry 4~8h to step by, Complete the production of the 4th stratotype shell；
Step 9. using step shell 8. as matrix, sequentially repeatedly step 7. with step 8., complete the production of layer 5 shell；
10. impregnates the shell of step 9. 30~120 seconds to step in paraffin latexes；Take out, temperature be 22~24 DEG C, Dry 6~12h, completes slurry seal in the environment that humidity is 35~45%.
4. fused quartz ceramic shell preparation method according to claim 3, which is characterized in that the 1# slurry and 2# slurry SiO in the silica solution of preparation2Content is respectively 25~31%.
5. fused quartz ceramic shell preparation method according to claim 1, which is characterized in that silica solution described in step 3 In SiO2Content is 25~31%.
6. fused quartz ceramic shell preparation method according to claim 1, which is characterized in that the vitreous silica in step 3 Soaking time of the ceramic shell in the coarse dispersion system of cristobalite fine powder is 30~120 seconds.
7. fused quartz ceramic shell preparation method according to claim 1, which is characterized in that the drying process in step 4 Condition is drying and processing 4~8 hours under the conditions of 60~120 DEG C of temperature.
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CN109261901B (en) * 2018-11-26 2021-01-05 惠州市吉邦精密技术有限公司 Shell manufacturing process of easily collapsible shell
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