CN102284677A - Die shell for precisely casting titanium alloy - Google Patents
Die shell for precisely casting titanium alloy Download PDFInfo
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- CN102284677A CN102284677A CN2011102444766A CN201110244476A CN102284677A CN 102284677 A CN102284677 A CN 102284677A CN 2011102444766 A CN2011102444766 A CN 2011102444766A CN 201110244476 A CN201110244476 A CN 201110244476A CN 102284677 A CN102284677 A CN 102284677A
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Abstract
The invention discloses a die shell for precisely casting a titanium alloy, composed of one surface layer, two transition layers, four reinforcing layers and sand spraying layers among the layers, wherein the surface layer contains boron nitride powder of 200 to 400 meshes, and the sand spraying layer between the surface layer and the transition layers is electric fused millite sand in a granularity of 40 to 100 meshes; the first transition layer contains Y2O3 powder of 200 to 400 meshes, the second transition layer contains Al2O3 powder of 200 to 400 meshes, and the sand spraying layers between the first transition layer and the second transition layer, as well as between the second transition layer and the reinforcing layers are electric fused millite sand in a granularity of 40 to 80 meshes; and the four reinforcing layers contain bauxite, and the three sand spraying layers among the four reinforcing layers are gangue sand of 16 to 24 meshes.
Description
Technical field
The present invention relates to the casting field, particularly hot investment casting titanium alloy field.
Background technology
Titanium is the novel engineering metal material that emerges rapidly after steel, iron, copper and aluminium, has characteristics such as intensity height, density are little, corrosion-resistant, nonmagnetic, good biocompatibility, more and more is subjected to people's favor.Initial stage is mainly used in military industry field, now just progressively to the civil area expansion, and increases rapidly.
Use more titanium alloy precision casting formwork at present, be broadly divided into: graphite formwork, tungsten surface layer ceramic shell mould, oxide ceramics formwork etc.Wherein, the foundry goods that the graphite formwork is poured into a mould out has the α brittle layer of one deck carburizing from the teeth outwards, and thickness is approximately 0.2～0.3mm, and it might cause the generation and the expansion of crackle under the stress effect.The heat endurance of graphite formwork has one limit, when graphite contacts with titanium liquid, is reaching under the condition of Activation energy, and rapid heat release chain reaction might take place, so the complicated titanium alloy casting of the unsuitable casting large of graphite formwork.In addition, the shrinkage factor height of graphite formwork is the twice of common hot investment casting ceramic shell mould, and this has influenced the precision of hot investment casting graphite formwork titanium alloy precision casting.When tungsten surface layer ceramic shell mould prepared, tungsten powder used as the filler in the coating, and the performance of tungsten powder has significant impact to the quality of formwork, and tungsten powder requires that high intensity is arranged, otherwise can influence the quality of titanium alloy casting.Tungsten surface layer precise casting mould shell α must adopt solvent dewaxing, thereby health is had injury, and the while is contaminated environment also; Tungsten surface layer formwork roasting under reducing atmosphere in addition, dewaxing stone is deposited on the lip-deep mould material of formwork ash content and is difficult to burn, and is easy to when cast and the reaction of liquid titanium, forms pore at cast(ing) surface.The oxide that the zirconia that uses in the surface layer of oxide ceramics formwork and the adjacent bed coating, yittrium oxide etc. are littler with the reaction of titanium liquid, its performance is higher; Yittrium oxide wherein is better as the investment precoat casting character of filler, but hydration takes place yittrium oxide easily, and its slurry changes very responsive to the pH value, easily gelling.In addition, the oxide ceramics formwork can't be avoided forming α pickup layer at cast(ing) surface, and its thickness does not wait in 0.02～0.2mm scope.
Summary of the invention
For the deficiencies in the prior art, one of purpose of the present invention is to provide a kind of precision casting of titanium alloy with formwork low-cost, that stability is strong, adopts the titanium alloy member of this formwork preparation to satisfy instructions for use.
To achieve these goals, the technical solution used in the present invention is:
A kind of precision casting of titanium alloy formwork, it is characterized in that: this formwork is made up of the stucco layer between 1 aspect layer, 2 layers of transition zone, 4 layers of back-up coat and each layer, wherein contain 200-400 purpose boron nitride powder in the surface layer, the stucco layer between surface layer and the transition zone is 40-100 purpose electrofused mullite sand for granularity; Contain 200-400 purpose Y in the 1st layer of transition zone
2O
3Powder contains 200-400 purpose Al in the 2nd layer of transition zone
2O
3Powder, between the 1st layer of transition zone and the 2nd layer of transition zone and the stucco layer between the 2nd transition zone and the back-up coat be 40-80 purpose electrofused mullite sand for granularity; All contain bauxite in 4 layers of back-up coat, 3 layers of stucco layer between 4 layers of back-up coat are 16-24 purpose bastard coal stone sand.
Above-mentioned hot investment casting titanium alloy with the preparation method of formwork is:
1) preparation surface layer: with granularity is that 200-400 purpose boron nitride powder and Ludox are that to be configured to flow cup viscosity in 2: 1～3: 1 be the 10-25 slip of second by weight; Above-mentioned slip is coated with hangs on the wax-pattern, the stucco granularity is a 40-100 purpose electrofused mullite sand, drying, preparation surface layer;
2) preparation transition zone: adopt 200-400 purpose Y
2O
3It is the 10-30 slip of second that powder and Ludox were configured to flow cup viscosity by weight 3: 1～4: 1, is coated with the 2nd layer, spreads the electrofused mullite sand of 40-80 order granularity, drying; Adopt again 200-400 purpose Al
2O
3It is the 10-30 slip of second that powder and Ludox were configured to flow cup viscosity by weight 3: 1～4: 1, is coated with the 3rd layer; Spread the electrofused mullite sand of 40-80 order granularity, drying;
3) preparation back-up coat: adopting bauxite and Ludox again is that 3: 1～4: 1 configurations bauxite slip and stucco granularities are that 16-24 purpose bastard coal stone sand is coated with extension and stucco 4-6 layer successively by weight, is coated with the once bauxite slip of above-mentioned preparation of extension at last, drying;
4) dewaxing, sintering.
Described step 1), add wetting agent, defoamer in the slip preparation process, wherein to account for the percentage by weight of slip be 1-5 ‰ to wetting agent, defoamer accounts for the percentage by weight 1-5 ‰ of slip, under stirring, add boron nitride powder, add wetting agent, defoamer afterwards successively, stir more than 10 hours, can coating;
Described wetting agent is polyethenoxy alkylphenols, low bubble wetting dispersing agent RFCF-10 or OPEO; Described defoamer is isopropyl alcohol, silicones or positive the eleventh of the twelve Earthly Branches alcohol.
It is 3-8 second in the 10-30 boron nitride slip of second that described step 1), wax-pattern group immerse flow cup viscosity, guarantees that slip evenly hangs on the wax-pattern, the stucco granularity is a 40-100 purpose electrofused mullite sand sand, in temperature is 30-35 ℃, and drying is 6 hours in the environment of humidity 30-70%, forms surface layer;
Described step 2) in, is coated with that to hang after the layers 2 and 3 in temperature be 30-35 ℃, in the environment of humidity 30-60% dry 8 hours, forms transition zone;
In the described step 3), the 4-6 layer is 30-35 ℃ in temperature all for every layer, and drying is 10 hours in the environment of humidity 30-60%, forms back-up coat; Last one deck is coated with hangs the bauxite slip, is 30-35 ℃ in temperature, and drying is 10 hours in the environment of humidity 30-60%;
Described Y2O3 powder is the electric smelting attitude;
Described step 4), the formwork that the dewaxing back forms carries out sintering again after room temperature is placed 4-10 hour, and the temperature of sintering is incubated 1-3 hour at 800-1200 ℃, and stove is chilled to below 300 ℃ and can takes out.
Beneficial effect of the present invention is:
1, the present invention adopts the surface material of the boron nitride of good stability as shell mould, and the oxygen feeding amount of control titanium alloy is fit to cast titanium alloy.Boron nitride is the highly stable refractory substance of a kind of chemical property, and the boron nitride ceramics formwork and the titanium or titanium alloy extent of reaction are little, and it is little to form α pickup layer thickness.The boron nitride stable chemical property, chemical reaction does not take place in it in water, acid, alkali, so contain the stable and gel not of the coating of boron nitride.
2. the present invention adopts boron nitride to do surface layer, adopts Y
2O
3And Al
2O
3Do transition zone, adopt electrofused mullite to do the stucco layer, guarantee surface layer and backing layer in conjunction with fastness.The selection of these several potteries and combination be so that the property indices of formwork all satisfies instructions for use, and with low cost
The specific embodiment
Embodiment one
A kind of precision casting of titanium alloy formwork, it is characterized in that: this formwork is made up of the stucco layer between 1 aspect layer, 2 layers of transition zone, 4 layers of back-up coat and each layer, wherein contain 200 purpose boron nitride powders in the surface layer, the stucco layer between surface layer and the transition zone is that granularity is 80 purpose electrofused mullite sand; Contain 320 purpose Y in the 1st layer of transition zone
2O
3Powder contains 320 purpose Al in the 2nd layer of transition zone
2O
3Powder, between the 1st layer of transition zone and the 2nd layer of transition zone and the stucco layer between the 2nd transition zone and the back-up coat be that granularity is 80 purpose electrofused mullite sand; All contain bauxite in 4 layers of back-up coat, 3 layers of stucco layer between 4 layers of back-up coat are 20 purpose bastard coal stone sands.
Above-mentioned hot investment casting titanium alloy with the preparation method of formwork is:
1) preparation surface layer: with granularity is that 200 purpose boron nitride powders and Ludox are configuration in 3: 1 by weight, add wetting agent, defoamer, wherein to account for the percentage by weight of slip be 3 ‰ to wetting agent, the percentage by weight that defoamer accounts for slip is 3 ‰, under stirring, add boron nitride powder, add wetting agent, defoamer afterwards successively, stirred 10 hours, be made into flow cup viscosity and be 16 seconds slip; In the present embodiment, wetting agent is a polyethenoxy alkylphenols, and defoamer is an isopropyl alcohol.The wax-pattern group was immersed in the above-mentioned boron nitride slip 6 seconds, guarantee that slip evenly hangs on the wax-pattern, the stucco granularity is 80 purpose electrofused mullite sand, and temperature is 30 ℃, in the environment of humidity 50% dry 6 hours, forms surface layer;
2) preparation transition zone: adopt 320 purpose Y
2O
3Powder and Ludox are 18 seconds slip by weight being configured to flow cup viscosity at 3: 1, are coated with the 2nd layer, spread the electrofused mullite sand of 80 order granularities, are 30 ℃ in temperature, in the environment of humidity 50% dry 8 hours; Adopt again 320 purpose Al
2O
3Powder and Ludox are 18 seconds slip by weight being configured to flow cup viscosity at 3: 1, are coated with the 3rd layer, spread the electrofused mullite sand of 80 order granularities, are 30 ℃ in temperature, in the environment of humidity 50% dry 8 hours; Form transition zone;
3) preparation back-up coat: adopting bauxite and Ludox again is that 3: 1 configurations bauxite slip and stucco granularities are that 20 purpose bastard coal stone sands are coated with extension and stucco 4-6 layer successively by weight, every layer is 30 ℃ in temperature all, drying is 10 hours in the environment of humidity 50%, forms back-up coat; Last one deck is coated with hangs the bauxite slip, is 30 ℃ in temperature, and drying is 10 hours in the environment of humidity 50%;
4) after employing steam mode dewaxed, formwork carried out sintering again after room temperature is placed 8 hours, and the temperature of sintering is incubated 2 hours at 1100 ℃, and stove is chilled to 300 ℃ of taking-ups, and the gained formwork waters a glass inner surface, the element stems position is bright and clean, and intensity is good.
With the formwork casting Ti6Al4V alloy of said method preparation, motlten metal and formwork slightly respond, and alloy is oxygenation 100ppm Wt% from formwork; And adopt common Al
2O
3Shell mould, the oxygen feeding amount of alloy has reached 600ppm Wt%.As seen, boron nitride shell mould surface material has excellent chemical stability.
Embodiment two
A kind of precision casting of titanium alloy formwork, it is characterized in that: this formwork is made up of the stucco layer between 1 aspect layer, 2 layers of transition zone, 4 layers of back-up coat and each layer, wherein contain 320 purpose boron nitride powders in the surface layer, the stucco layer between surface layer and the transition zone is that granularity is 100 purpose electrofused mullite sand; Contain 320 purpose Y in the 1st layer of transition zone
2O
3Powder contains 320 purpose Al in the 2nd layer of transition zone
2O
3Powder, between the 1st layer of transition zone and the 2nd layer of transition zone and the stucco layer between the 2nd transition zone and the back-up coat be that granularity is 80 purpose electrofused mullite sand; All contain bauxite in 4 layers of back-up coat, 3 layers of stucco layer between 4 layers of back-up coat are 24 purpose bastard coal stone sands.
Above-mentioned hot investment casting titanium alloy with the preparation method of formwork is:
1) preparation surface layer: with granularity is that 320 purpose boron nitride powders and Ludox are configuration in 2.5: 1 by weight, add wetting agent, defoamer, wherein to account for the percentage by weight of slip be 3 ‰ to wetting agent, the percentage by weight that defoamer accounts for slip is 3 ‰, under stirring, add boron nitride powder, add wetting agent, defoamer afterwards successively, stirred 10 hours, be made into flow cup viscosity and be 13 seconds slip; In the present embodiment, wetting agent is a polyethenoxy alkylphenols, and defoamer is an isopropyl alcohol.The wax-pattern group was immersed in the above-mentioned boron nitride slip 6 seconds, guarantee that slip evenly hangs on the wax-pattern, the stucco granularity is 100 purpose electrofused mullite sand, and temperature is 35 ℃, in the environment of humidity 40% dry 6 hours, forms surface layer;
2) preparation transition zone: adopt 320 purpose Y
2O
3Powder and Ludox are 20 seconds slip by weight being configured to flow cup viscosity at 3.5: 1, are coated with the 2nd layer, spread the electrofused mullite sand of 80 order granularities, are 35 ℃ in temperature, in the environment of humidity 40% dry 8 hours; Adopt again 320 purpose Al
2O
3Powder and Ludox are 20 seconds slip by weight being configured to flow cup viscosity at 3.5: 1, are coated with the 3rd layer, spread the electrofused mullite sand of 80 order granularities, are 35 ℃ in temperature, in the environment of humidity 40% dry 8 hours; Form transition zone;
3) preparation back-up coat: adopting bauxite and Ludox again is that 3.5: 1 configurations bauxite slip and stucco granularities are that 24 purpose bastard coal stone sands are coated with extension and stucco 4-6 layer successively by weight, every layer is 35 ℃ in temperature all, drying is 10 hours in the environment of humidity 40%, forms back-up coat; Last one deck is coated with hangs the bauxite slip, is 35 ℃ in temperature, and drying is 10 hours in the environment of humidity 40%;
4) after employing steam mode dewaxed, formwork carried out sintering again after room temperature is placed 10 hours, and the temperature of sintering is incubated 1 hour at 1200 ℃, and stove is chilled to 300 ℃ of taking-ups, and the gained formwork waters a glass inner surface, the element stems position is bright and clean, and intensity is good.
With embodiment one and two formwork casting Ti6Al4V alloy, motlten metal and formwork slightly respond, and alloy is oxygenation 100-120ppm Wt% from formwork; And adopt common Al
2O
3Shell mould, the oxygen feeding amount of alloy has reached 600ppm Wt%.As seen, the performance of formwork of the present invention than the prior art excellence many.
Applicant's statement, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, does not mean that namely the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.The person of ordinary skill in the field should understand, any improvement in the present invention to the interpolation of the equivalence replacement of each raw material of product of the present invention and auxiliary element, the selection of concrete mode etc., all drops on protection scope of the present invention and open range.
Claims (1)
1. precision casting of titanium alloy formwork, it is characterized in that: this formwork is made up of the stucco layer between 1 aspect layer, 2 layers of transition zone, 4 layers of back-up coat and each layer, wherein contain 200-400 purpose boron nitride powder in the surface layer, the stucco layer between surface layer and the transition zone is 40-100 purpose electrofused mullite sand for granularity; Contain 200-400 purpose Y in the 1st layer of transition zone
2O
3Powder contains 200-400 purpose Al in the 2nd layer of transition zone
2O
3Powder, between the 1st layer of transition zone and the 2nd layer of transition zone and the stucco layer between the 2nd transition zone and the back-up coat be 40-80 purpose electrofused mullite sand for granularity; All contain bauxite in 4 layers of back-up coat, 3 layers of stucco layer between 4 layers of back-up coat are 16-24 purpose bastard coal stone sand.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102444766A CN102284677A (en) | 2011-08-24 | 2011-08-24 | Die shell for precisely casting titanium alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102444766A CN102284677A (en) | 2011-08-24 | 2011-08-24 | Die shell for precisely casting titanium alloy |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921889A (en) * | 2012-11-07 | 2013-02-13 | 西安西工大超晶科技发展有限责任公司 | Precision investment casting casing-making method suitable for stainless steel casting |
| CN102921888A (en) * | 2012-11-07 | 2013-02-13 | 西安西工大超晶科技发展有限责任公司 | Manufacturing method of fired mold precision cast aluminum alloy case |
| CN106984795A (en) * | 2017-03-23 | 2017-07-28 | 西北工业大学 | A kind of Ti55 casts the temperature control clotting method of high-temperature titanium alloy |
| CN107695283A (en) * | 2017-09-28 | 2018-02-16 | 宝鸡市永盛泰钛业有限公司 | A kind of preparation method of titanium alloy formwork |
| CN113275515A (en) * | 2021-04-30 | 2021-08-20 | 西安斯瑞先进铜合金科技有限公司 | Rapid pump body investment casting method based on photocuring additive technology |
-
2011
- 2011-08-24 CN CN2011102444766A patent/CN102284677A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921889A (en) * | 2012-11-07 | 2013-02-13 | 西安西工大超晶科技发展有限责任公司 | Precision investment casting casing-making method suitable for stainless steel casting |
| CN102921888A (en) * | 2012-11-07 | 2013-02-13 | 西安西工大超晶科技发展有限责任公司 | Manufacturing method of fired mold precision cast aluminum alloy case |
| CN102921889B (en) * | 2012-11-07 | 2015-04-22 | 西安西工大超晶科技发展有限责任公司 | Precision investment casting casing-making method suitable for stainless steel casting |
| CN106984795A (en) * | 2017-03-23 | 2017-07-28 | 西北工业大学 | A kind of Ti55 casts the temperature control clotting method of high-temperature titanium alloy |
| CN106984795B (en) * | 2017-03-23 | 2019-04-19 | 西北工业大学 | A kind of temperature control clotting method of Ti55 casting high-temperature titanium alloy |
| CN107695283A (en) * | 2017-09-28 | 2018-02-16 | 宝鸡市永盛泰钛业有限公司 | A kind of preparation method of titanium alloy formwork |
| CN113275515A (en) * | 2021-04-30 | 2021-08-20 | 西安斯瑞先进铜合金科技有限公司 | Rapid pump body investment casting method based on photocuring additive technology |
| CN113275515B (en) * | 2021-04-30 | 2022-07-29 | 西安斯瑞先进铜合金科技有限公司 | Rapid pump body investment casting method based on photocuring additive technology |
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Application publication date: 20111221 |