CN103658533B - A kind of beryllium alumin(i)um alloy ceramic shell mould and preparation method thereof - Google Patents
A kind of beryllium alumin(i)um alloy ceramic shell mould and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of beryllium alumin(i)um alloy ceramic shell mould and preparation method, this beryllium alumin(i)um alloy ceramic shell mould is made up of surface layer, transition zone and back-up coat, and the calcined oxide aluminium powder that wherein said surface layer uses granularity to be 300～325 mesh is raw material with the aluminum oxide sand that granularity is 80～120 mesh；Transition zone uses granularity to be that in 200～225 purposes, shop powder and granularity are that in 25～36 purposes, shop sand is raw material；Back-up coat uses granularity to be that in 200～225 purposes, shop powder and granularity are that in 10～16 purposes, shop sand is raw material.The raw materials such as the avirulence of employing of the present invention own, the aluminium oxide that price is low, upper shop sand, so it is prepared beryllium alumin(i)um alloy ceramic shell mould avirulence, pollution-free, safe and reliable, there is the advantages such as high temperature resistant, intensity is high, good stability, and owing to the price of raw material is low, being greatly saved cost of material and protection cost, preparation technology is simple, and technological process is short, production cost is low, and the stability of gained beryllium alumin(i)um alloy product and yield rate are high.
Description
Technical field
The present invention relates to technical field of nonferrous metal processing, particularly relate to a kind of beryllium alumin(i)um alloy ceramic shell mould and preparation
Method.
Background technology
Beryllium alumin(i)um alloy precision-investment casting is a kind of near-net-shape technology, can produce the part of clean shape, reduce material
The refining losses such as cutting.At present, in the sector, the ceramic shell mould used by cast is the patent of Bradley Shi Weierman
The beryllium oxide formwork of CN1125963A report, its preparation method is to be coated with to hang over by beryllium oxide (BeO) slurry to make on wax-pattern.This
The weak point of method is that beryllium oxide toxicity is big, cost is high, and environmental pollution is serious, adds the difficulty of protection.
Summary of the invention
The purpose of the present invention is that and overcomes above-mentioned defect of the prior art, it is provided that a kind of avirulence, pollution-free, technique
Simply, production cost is low, and high temperature resistant, intensity is high, the beryllium alumin(i)um alloy ceramic shell mould of good stability；
It is a further object of the present invention to provide the preparation method of above-mentioned beryllium alumin(i)um alloy ceramic shell mould.
Ceramic shell mould as beryllium alumin(i)um alloy hot investment casting, it is necessary to possess；1) high temperature resistant, at beryllium alumin(i)um alloy molten metal
Will not feel like jelly during cast fusing；2) intensity is high, will not be split up when beryllium alumin(i)um alloy is poured into a mould；3) ceramic shell mould surface material is not
React with beryllium alumin(i)um alloy liquation；4) heat impact strength to be got well；5) when high temperature, dimensional stability to be got well.
For the foregoing reasons, the present invention uses following technical proposals:
A kind of beryllium alumin(i)um alloy ceramic shell mould, it is characterised in that be made up of surface layer, transition zone and back-up coat, wherein said
The calcined oxide aluminium powder that surface layer uses granularity to be 300～325 mesh is raw material with the aluminum oxide sand that granularity is 80～120 mesh；Transition
Layer uses granularity to be that in 200～225 purposes, shop powder and granularity are that in 25～36 purposes, shop sand is raw material；Back-up coat employing granularity is
In 200～225 purposes, shop powder and granularity are that in 10～16 purposes, shop sand is raw material.
The preparation method of above-mentioned beryllium alumin(i)um alloy ceramic shell mould, it is characterised in that its technical process is:
1) wax-pattern is prepared；
2) wax-pattern is immersed in the slurry that calcined oxide aluminium powder and the binding agent being mainly made up of Ludox are mixed into, quiet
Only take out after 5～10 seconds, then by sand sprinkling machine, aluminum oxide sand painting is hung over wax pattern surface, under 20 ± 2 DEG C of temperature conditionss certainly
Repeat after so air-drying 3～4 hours this process 1～2 times surface layer；
3) surface layer is immersed in the slurry that upper shop powder and the binding agent being mainly made up of Ludox are mixed into, static 5～
Take out after 10 seconds, then by floating sand machine, sand painting in upper shop is hung over its surface, natural air drying 12-under 20 ± 2 DEG C of temperature conditionss
Repeat after 24 hours this process 3～4 times transition zone；
4) transition zone is immersed in the slurry that upper shop powder and the binding agent being mainly made up of Ludox are mixed into, static 5
～take out after 10 seconds, then by floating sand machine, sand painting in upper shop is hung over its surface, natural air drying under 20 ± 2 DEG C of temperature conditionss
Repeat after 12-24 hour this process 1～2 times back-up coat；
5) dewax, sinter.
Described Ludox be dioxide-containing silica be 30%, pH be the Ludox of 6～8.
In described surface layer, calcined oxide aluminium powder is 2:1～2:1.5 with the weight proportion of binding agent.
In described transition zone, upper shop powder is 2:1.5～1:1 with the weight proportion of binding agent.
In described back-up coat, upper shop powder is 2:1.5～1:1 with the weight proportion of binding agent.
The described binding agent mainly having Ludox to constitute consists of:
Ludox: 94%～97%,
Defoamer: 0.5%～1%,
Molten humectant: 0.5%～1%,
Pure water: 2%～4%.Wherein defoamer is YQ-C01 type organic silicon defoamer, and it is a kind of surfactant, its
Effect is suppression slurry foaming.Molten humectant is the molten humectant of YQ-D01, and it is also a kind of surfactant, and its effect is to improve coating
And the being coated with property between wax-pattern.
Described dewaxing temperature controls at 165 ± 5 DEG C.
Described sintering temperature controls in the following manner: 200 DEG C/insulation 1h → 400 DEG C/insulation 1.0h → 600 DEG C/insulation
1.0h → 800 DEG C/insulation 1.0h → 1100 DEG C/1.0h/ is incubated 2h.
The raw materials such as the avirulence of employing of the present invention own, the aluminium oxide that price is low, upper shop sand, so prepared beryllium alumin(i)um alloy
By ceramic shell mould avirulence, pollution-free, low to environmental requirement, safe and reliable, have high temperature resistant, intensity is high, good stability etc. is excellent
Point, and owing to the price of raw material is low, it is greatly saved cost of material and protection cost.Preparation technology of the present invention is simple, technique stream
Journey is short, and production cost is low.Apply beryllium alumin(i)um alloy ceramic shell mould of the present invention can improve stability and the finished product of beryllium alumin(i)um alloy product
Rate, produces preferable economic worth.
Detailed description of the invention
Below in conjunction with example, the detailed description of the invention of the present invention is elaborated.
Embodiment 1: a kind of for Be-38%Al alloy precision mold and pattern for casting shell preparation method process:
1, the wax-pattern needed for product is prepared according to existing method.First wax material is preheating in wax injector 65 DEG C～70 DEG C
In the range of, then wax material was filled within the time of 15～30 seconds type in metal punching block, after pressurize 30～60 seconds, by molding
Wax part takes out in metal punching block and is placed in room temperature pond, carries out dimensional measurement after cooling down 1～2 hour, and each size meets
Qualified wax-pattern it is after drawing requirement.
2, mixed slurry:
Binding agent: the Ludox that dioxide-containing silica is 30%, pH is 6～8: 96%,
The organic defoamer of YQ-C01 type: 0.5%,
YQ-D01 type organo wetting agents: 0.5%,
Pure water: 3%.
Surface layer slurry: calcined oxide aluminium powder (granularity is 300～325 mesh) is mixed according to the ratio of 2:1 with above-mentioned binding agent
Close, stir standby.
Transition zone slurry: upper shop powder (granularity 200～225 mesh) is mixed according to the ratio of 2:1.5 with above-mentioned binding agent, fills
Point stir standby.
Back-up coat slurry: upper shop powder (granularity 200～225 mesh) is mixed according to the ratio of 2:1.5 with above-mentioned binding agent, fills
Point stir standby.
3, surface layer is coated with: be immersed in by wax-pattern in above-mentioned surface layer slurry, takes out after static 5～10 seconds, then by drenching sand
Aluminum oxide sand (granularity is 80～120 mesh) is coated with and hangs over wax pattern surface by machine, then natural air drying 3 hours under the conditions of 20 ± 2 DEG C.
Repeat this process 2 times surface layer, control humidity 60～70%.
4, transition zone is coated with: be immersed in by surface layer in above-mentioned transition zone slurry, takes out, then pass through after static 5～10 seconds
Upper shop sand (granularity is 25～36 mesh) is coated with and hangs over its surface, then natural air drying 24 hours under the conditions of 20 ± 2 DEG C by floating sand machine.
Repeat this process 3 times transition zone, control humidity 50～60%.
5, back-up coat is coated with: immersed by transition zone in above-mentioned back-up coat slurry, takes out, then pass through after static 5～10 seconds
Upper shop sand (granularity is 10～16 mesh) is coated with and hangs over its surface, then natural air drying 24 hours under the conditions of 20 ± 2 DEG C by floating sand machine.
Repeat this process 2 times back-up coat；Control humidity 40～50%.
6, according to above-mentioned process conditions: surface layer 2 times, transition zone 3 times, back-up coat 2 times, obtain the pottery of desired thickness and intensity
Ceramic former shell；
7, dewaxing: set dewaxing time, pressure according to shell size.Dewaxing temperature is 165 ± 5 DEG C.
8, sintering: strictly to control sintering temperature during sintering formwork: 200 DEG C/insulation 1h → 400 DEG C/insulation 1.0h → 600
DEG C/insulation 1.0h → 800 DEG C/insulation 1.0h → 1100 DEG C/1.0h/ be incubated 2h.Heating, cooling crosses range request uniformly, steadily, temperature
Gradient is little avoids shock heating quenching for degree.
9, deposit: after terminating, take out ceramic shell mould, place it under the preferable room temperature environment of ventilation.
Embodiment 2: a kind of for Be-34%Al-4%Ni alloy precision mold and pattern for casting shell preparation method process:
1, the wax-pattern needed for product is prepared according to existing method.First wax material is preheating in wax injector 65 DEG C～70 DEG C
In the range of, then wax material was filled within the time of 15～30 seconds type in metal punching block, after pressurize 30～60 seconds, by molding
Wax part takes out in metal punching block and is placed in room temperature pond, carries out dimensional measurement after cooling down 1～2 hour, and each size meets
Qualified wax-pattern it is after drawing requirement.
2, mixed slurry:
Binding agent: binding agent: the Ludox that dioxide-containing silica is 30%, pH is 6～8: 97%,
The organic defoamer of YQ-C01 type: 0.5%,
YQ-D01 type organo wetting agents: 0.5%,
Pure water: 2%.
Surface layer slurry: by calcined oxide aluminium powder (granularity is 300～325 mesh) and above-mentioned binding agent according to the ratio of 2:1.5
Mixing, stirs standby.
Transition zone slurry: upper shop powder (granularity 200～225 mesh) is mixed according to the ratio of 1:1 with above-mentioned binding agent, fully
Stir standby.
Back-up coat slurry: upper shop powder (granularity 200～225 mesh) is mixed according to the ratio of 1:1 with above-mentioned binding agent, fully
Stir standby.
3, surface layer is coated with: be immersed in by wax-pattern in above-mentioned surface layer slurry, takes out after static 5～10 seconds, then by drenching sand
Aluminum oxide sand (granularity is 80～120 mesh) is coated with and hangs over wax pattern surface by machine, then natural air drying 4 hours under the conditions of 20 ± 2 DEG C.
This process 1 time surface layer, control humidity 60～70%.
4, transition zone is coated with: be immersed in by surface layer in transition zone slurry, takes out, then by floating sand after static 5～10 seconds
Upper shop sand (granularity is 25～36 mesh) is coated with and hangs over its surface, then natural air drying 24 hours under the conditions of 20 ± 2 DEG C by machine.Repeat
This process 4 times transition zone, control humidity 50～60%.
5, back-up coat is coated with: be immersed in by transition zone in above-mentioned back-up coat slurry, takes out, then lead to after static 5～10 seconds
Crossing floating sand machine and upper shop sand (granularity is 10～16 mesh) painting is hung over its surface, then under the conditions of 20 ± 2 DEG C, natural air drying 24 is little
Time.Repeat this process 2 times back-up coat；Control humidity 40～50%.
6, according to above-mentioned process conditions: surface layer 1 time, transition zone 4 times, back-up coat 2 times, obtain the pottery of desired thickness and intensity
Ceramic former shell；
7, dewaxing: set dewaxing time, pressure according to shell size.Dewaxing temperature is 165 ± 5 DEG C.
8, sintering: strictly to control sintering temperature during sintering formwork: 200 DEG C/insulation 1h → 400 DEG C/insulation 1.0h → 600
DEG C/insulation 1.0h → 800 DEG C/insulation 1.0h → 1100 DEG C/1.0h/ be incubated 2h.Heating, cooling crosses range request uniformly, steadily, temperature
Gradient is little avoids shock heating quenching for degree.
9, deposit: after terminating, take out ceramic shell mould, place it under the preferable room temperature environment of ventilation.
Embodiment 3: a kind of for Be-34%Al-4%Ni alloy precision mold and pattern for casting shell preparation method process:
1, the wax-pattern needed for product is prepared according to existing method.First wax material is preheating in wax injector 65 DEG C～70 DEG C
In the range of, then wax material was filled within the time of 15～30 seconds type in metal punching block, after pressurize 30～60 seconds, by molding
Wax part takes out in metal punching block and is placed in room temperature pond, carries out dimensional measurement after cooling down 1～2 hour, and each size meets
Qualified wax-pattern it is after drawing requirement.
2, mixed slurry:
Binding agent: binding agent: the Ludox that dioxide-containing silica is 30%, pH is 6～8: 94%,
The organic defoamer of YQ-C01 type: 1%,
YQ-D01 type organo wetting agents: 1%,
Pure water: 4%.
Surface layer slurry: by calcined oxide aluminium powder (granularity is 300～325 mesh) and above-mentioned binding agent according to the ratio of 2:1.2
Mixing, stirs standby.
Transition zone slurry: upper shop powder (granularity 200～225 mesh) is mixed according to the ratio of 2:1.8 with above-mentioned binding agent, fills
Point stir standby.
Back-up coat slurry: upper shop powder (granularity 200～225 mesh) is mixed according to the ratio of 2:1.8 with above-mentioned binding agent, fills
Point stir standby.
3, surface layer is coated with: be immersed in by wax-pattern in above-mentioned surface layer slurry, takes out after static 5～10 seconds, then by drenching sand
Aluminum oxide sand (granularity is 80～120 mesh) is coated with and hangs over wax pattern surface by machine, then natural air drying 4 hours under the conditions of 20 ± 2 DEG C.
This process 1 time surface layer, control humidity 60～70%.
4, transition zone is coated with: be immersed in by surface layer in above-mentioned transition zone slurry, takes out, then pass through after static 5～10 seconds
Upper shop sand (granularity is 25～36 mesh) is coated with and hangs over its surface, then natural air drying 12 hours under the conditions of 20 ± 2 DEG C by floating sand machine.
Repeat this process 4 times transition zone, control humidity 50～60%.
5, back-up coat is coated with: be immersed in by transition zone in above-mentioned back-up coat slurry, takes out, then lead to after static 5～10 seconds
Crossing floating sand machine and upper shop sand (granularity is 10～16 mesh) painting is hung over its surface, then under the conditions of 20 ± 2 DEG C, natural air drying 12 is little
Time.Repeat this process 2 times back-up coat；Control humidity 40～50%.
6, according to above-mentioned process conditions: surface layer 1 time, transition zone 4 times, back-up coat 2 times, obtain the pottery of desired thickness and intensity
Ceramic former shell；
7, dewaxing: set dewaxing time, pressure according to shell size.Dewaxing temperature is 165 ± 5 DEG C.
8, sintering: strictly to control sintering temperature during sintering formwork: 200 DEG C/insulation 1h → 400 DEG C/insulation 1.0h → 600
DEG C/insulation 1.0h → 800 DEG C/insulation 1.0h → 1100 DEG C/1.0h/ be incubated 2h.Heating, cooling crosses range request uniformly, steadily, temperature
Gradient is little avoids shock heating quenching for degree.
9, deposit: after terminating, take out ceramic shell mould, place it under the preferable room temperature environment of ventilation.
Claims (4)
1. a beryllium alumin(i)um alloy ceramic shell mould, it is characterised in that be made up of surface layer, transition zone and back-up coat, wherein said
The calcined oxide aluminium powder that layer uses granularity to be 300～325 mesh is raw material with the aluminum oxide sand that granularity is 80～120 mesh；Transition zone
Using granularity is that in 200～225 purposes, shop powder and granularity are that in 25～36 purposes, shop sand is raw material；Back-up coat employing granularity is
In 200～225 purposes, shop powder and granularity are that in 10～16 purposes, shop sand is raw material；
Above-mentioned beryllium alumin(i)um alloy ceramic shell mould uses following processing step to prepare:
1) wax-pattern is prepared；
2) wax-pattern is immersed in the slurry that calcined oxide aluminium powder and the binding agent being mainly made up of Ludox are mixed into, static 5
～take out after 10 seconds, then by sand sprinkling machine, aluminum oxide sand painting is hung over wax pattern surface, natural wind under 20 ± 2 DEG C of temperature conditionss
Repeat after dry 3～4 hours this process 1～2 times surface layer, the wherein weight proportion of calcined oxide aluminium powder and binding agent in surface layer
For 2:1～2:1.5；
3) surface layer is immersed in the slurry that upper shop powder and the binding agent being mainly made up of Ludox are mixed into, static 5～10 seconds
Rear taking-up, then hangs over its surface by floating sand machine by the painting of upper shop sand, and under 20 ± 2 DEG C of temperature conditionss, natural air drying 12-24 is little
Repeat time after this process 3～4 times transition zone, wherein in transition zone the weight proportion of upper shop powder and binding agent be 2:1.5～
1:1；
4) transition zone is immersed in the slurry that upper shop powder and the binding agent being mainly made up of Ludox are mixed into, static 5～10
Take out after Miao, then by floating sand machine, sand painting in upper shop is hung over its surface, natural air drying 12-24 under 20 ± 2 DEG C of temperature conditionss
Repeat after hour this process 1～2 times back-up coat, wherein in back-up coat, the weight proportion of upper shop powder and binding agent is 2:1.5
～1:1；
5) dewax, sinter.
2. according to the beryllium alumin(i)um alloy ceramic shell mould described in claim 1, it is characterised in that described Ludox is that silicon dioxide contains
The Ludox that amount is 30%, pH is 6～8.
3. according to the beryllium alumin(i)um alloy ceramic shell mould described in claim 1, it is characterised in that described be mainly made up of Ludox
Binding agent consists of:
Ludox: 94%～97%,
Defoamer: 0.5%～1%,
Molten humectant: 0.5%～1%,
Pure water: 2%～4%.
4. according to the beryllium alumin(i)um alloy ceramic shell mould described in claim 1, it is characterised in that described dewaxing temperature controls 165 ±
5℃。
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| CN104399886B (en) * | 2014-11-03 | 2016-09-14 | 西安航空动力股份有限公司 | A kind of formwork back-up coat slurry preparation method and formwork processing method |
| CN104997248A (en) * | 2015-06-02 | 2015-10-28 | 杨允棠 | Hollowed-out character jewelry making method |
| CN109014025B (en) * | 2018-09-21 | 2020-06-09 | 中国工程物理研究院材料研究所 | Beryllium-aluminum alloy precision casting release agent and preparation method thereof |
| CN110918875A (en) * | 2019-09-10 | 2020-03-27 | 西北稀有金属材料研究院宁夏有限公司 | Preparation method of mold shell for casting beryllium-aluminum alloy |
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Address after: 753000 No. 119 metallurgical Road, Dawukou District, Shizuishan, the Ningxia Hui Autonomous Region Patentee after: Northwest rare metal materials research institute Ningxia Co., Ltd. Address before: 753000 No. 119 metallurgical Road, Dawukou District, Shizuishan, the Ningxia Hui Autonomous Region Patentee before: Xibei Inst. of Rare Metal Material |
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