CN102974761A - Preparation method for calcium zirconate formwork through titanium and titanium aluminium alloy fired mould precision casting - Google Patents
Preparation method for calcium zirconate formwork through titanium and titanium aluminium alloy fired mould precision casting Download PDFInfo
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- CN102974761A CN102974761A CN2012105130464A CN201210513046A CN102974761A CN 102974761 A CN102974761 A CN 102974761A CN 2012105130464 A CN2012105130464 A CN 2012105130464A CN 201210513046 A CN201210513046 A CN 201210513046A CN 102974761 A CN102974761 A CN 102974761A
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Abstract
The invention belongs to the field of precisely casting a formwork through a fired mould, and particularly relates to a preparation method for a calcium zirconate formwork through titanium and titanium aluminium alloy fired mould precision casting. By the method, calcium zirconate is taken as an inertia separation layer, because the calcium zirconate is abundant in raw material and low in cost, the prepared formwork is low in cost; the slurry made from the mixture of the calcium zirconate and zirconium sol has good coating performance with a wax mould, and is stable in performance, easy to store in a long term, and suitable for batched production of a casting piece; the inertia separation layer is high in chemical stability, weak in reaction with the interface between titanium and titanium aluminium alloy melts, thin in pollution layer and good in surface quality of the casting piece; and the formwork is high in strength, and the metallurgical quality of the casting piece is excellent. The method can be widely applied in the research and the production of a titanium and titanium aluminium alloy fired mould precise casting piece in the fields of aerospace, energy and chemical industry, ocean industrial development and the like.
Description
Technical field
The invention belongs to precision-investment casting formwork field, furtherly, relate to the preparation method of a kind of titanium and titanium aluminium base alloy precision-investment casting calcium zirconate formwork.
Background technology
It is little that titanium or titanium alloy has density, specific strength is high, the characteristics such as corrosion resistance is good, it is a kind of structural material of excellence, in Aero-Space, petrochemical industry, the marine industries development field is widely used, but titanium or titanium alloy relatively is difficult to processing, especially the part of labyrinth, and titanium and titanium aluminium base alloy model casting can prepare the foundry goods of any complicated shape or structure, can be without surplus or near-net-shape, but high temperature titanium melt almost reacts with the material that all touch, generate pollution layer at cast(ing) surface, worsen surface quality of continuous castings, the serious mechanical property that reduces foundry goods, the refractory material that is used as at present inert barriers in the titanium or titanium alloy precision-investment casting has yittrium oxide, zirconia, calcium oxide etc., but yittrium oxide, the zirconia cost is higher, although the calcium oxide inertia is better, easy deliquescence severe exacerbation formwork quality.
Summary of the invention
For the interaction between high-temperature fusant and the formwork interface in reduction titanium and the titanium aluminium base alloy precision-investment casting process and reduction formwork preparation cost, the present invention proposes a kind of preparation method who is suitable for titanium and titanium aluminium base alloy precision-investment casting calcium zirconate formwork.
Technical solution of the present invention is that preparation process is as follows:
1) inert barriers preparation: the zirconic acid calcium powder is poured into fully mixing in the zirconium colloidal sol, stir, powder liquid mass ratio is 3:1～7:1, and adding wetting agent and sintering aid, mix, fully wetting, be prepared into the inert barriers slip, wherein, wetting agent is 0.01～0.6 ‰ of zirconium colloidal sol gross mass, the addition of sintering aid is 0.1～1% of zirconium colloidal sol gross mass, and the calcium zirconate Powder Particle Size is 200～500 orders, and inert barriers slip flow cup viscosity is 30～100s, this slip is coated with hangs on the wax-pattern, spread calcium zirconate sand, the stucco granularity is 40～150 orders, drying; Repeat the inert barriers that aforesaid operations forms formwork for 2～4 times;
2) backing layer strengthening layer preparation: bauxite powder or colliery powder and Ludox are mixed by powder liquid mass ratio 2:1～6:1, fully wetting, be prepared into backing layer strengthening layer slip, bauxite or colliery powder granularity are 200～500 orders, backing layer strengthening layer slip flow cup viscosity is 20～50s, be coated with slip, spread bauxite or bastard coal stone sand, the stucco granularity is 30～100 orders; Dry; Repeat aforesaid operations 3～8 times, last one deck is coated with not stucco behind the slurry, makes the backing layer strengthening layer of formwork;
3) wax pattern removes, high temperature sintering.
Drying room temperature in the described inert barriers preparation is 20～26 ℃, and drying room relative humidity is 50～85%, and the interlayer drying time is 12～24 hours.
Drying room temperature in the described backing layer strengthening layer preparation is 20～26 ℃, and drying room relative humidity is 20～85%, and the interlayer drying time is 12～24 hours.
Shell after described wax pattern removes is sintering under 900～1300 ℃ high temperature, is incubated 2～6 hours, and cool to room temperature is come out of the stove.
Formwork preparation method's of the present invention advantage: the present invention adopts calcium zirconate as inert barriers, because calcium zirconate abundant raw materials, cheap, prepared shell cost is lower to making; Slip and the screening characteristics between wax-pattern that calcium zirconate and zirconium colloidal sol are mixed with are better, and the slip stable performance is easy to long preservation, are fit to the mass production of foundry goods; The chemical stability of inert barriers is high, and the interfacial reaction between the titanium or titanium alloy melt a little less than, pollution layer is thin, surface quality of continuous castings is good; Investment shell intensity is high, and metallurgical quality of cast is excellent.This invention can be widely used in the titanium in the fields such as Aero-Space, derived energy chemical, marine industries exploitation and the research and production of titanium aluminium base alloy Melt casting.
The specific embodiment
Be suitable for the preparation method of titanium and titanium aluminium base alloy precision-investment casting calcium zirconate formwork, the steps include:
1) inert barriers preparation: the zirconic acid calcium powder is poured into fully mixing in the zirconium colloidal sol, stir, the powder liquor ratio is 3:1～7:1, and adds wetting agent and sintering aid, mix, fully wetting, be prepared into the inert barriers slip, slip is coated with hangs on the wax-pattern, spread calcium zirconate sand, drying; Repeat the inert barriers that aforesaid operations forms formwork for 2～4 times;
2) backing layer strengthening layer preparation: bauxite powder or colliery powder and Ludox are mixed by powder liquor ratio 2:1～6:1, fully wetting, be prepared into backing layer strengthening layer slip, be coated with slip, spread bauxite or bastard coal stone sand, drying; Repeat aforesaid operations 3～8 times, last one deck is coated with not stucco behind the slurry, makes the backing layer strengthening layer of formwork;
3) wax pattern removes, high temperature sintering.
The wetting agent that adds in the described step 1) is 0.01～0.6 ‰ of zirconium colloidal sol gross mass;
The addition of the sintering aid that adds in the described step 1) is 0.1～1% of zirconium colloidal sol gross mass;
The calcium zirconate Powder Particle Size is 200～500 orders in the described step 1), and inert barriers slip flow cup viscosity is 30～100s, and the stucco granularity is 40～150 orders;
The drying room temperature is 20～26 ℃ in the described step 1), and drying room relative humidity is 50～85%, and the interlayer drying time is 12～24 hours;
Described step 2) bauxite or colliery powder granularity are 200～500 orders in, and backing layer strengthening layer slip flow cup viscosity is 20～50s, and the stucco granularity is 30～100 orders;
Described step 2) the drying room temperature is 20～26 ℃ in, and drying room relative humidity is 20～85%, and the interlayer drying time is 12～24 hours;
Described shell sintering under 900～1300 ℃ high temperature after wax pattern removes in step 3) is incubated 2～6 hours, and cool to room temperature is come out of the stove.
Embodiment one
Step and the technological process of present embodiment are as follows:
1) inert barriers preparation: the zirconic acid calcium powder is poured into fully mixing in the zirconium colloidal sol, stir, the powder liquor ratio is 3:1, and adds wetting agent and sintering aid, mix, fully wetting, be prepared into the inert barriers slip, slip is coated with hangs on the wax-pattern, spread calcium zirconate sand, drying; Repeat the inert barriers that aforesaid operations forms formwork for 2 times;
2) backing layer strengthening layer preparation: bauxite powder or colliery powder and Ludox are mixed by powder liquor ratio 2:1～6:1, fully wetting, be prepared into backing layer strengthening layer slip, be coated with slip, spread bauxite or bastard coal stone sand, drying; Repeat aforesaid operations 6 times, last one deck is coated with not stucco behind the slurry, makes the backing layer strengthening layer of formwork;
3) wax pattern removes, high temperature sintering.
The wetting agent that adds in the step 1) is 0.2～0.3 ‰ of zirconium colloidal sol gross mass;
The addition of the sintering aid that adds in the step 1) is 0.1～1% of zirconium colloidal sol gross mass;
The calcium zirconate Powder Particle Size is 200～500 orders in the step 1), and inert barriers slip flow cup viscosity is 30～100s, and the stucco granularity is 40～150 orders;
The drying room temperature is 20～26 ℃ in the step 1), and drying room relative humidity is 50～85%, and the interlayer drying time is 12～24 hours;
Step 2) bauxite or colliery powder granularity are 200～500 orders in, and backing layer strengthening layer slip flow cup viscosity is 20～50s, and the stucco granularity is 30～100 orders;
Step 2) the drying room temperature is 20～26 ℃ in, and drying room relative humidity is 20～85%, and the interlayer drying time is 12～24 hours;
Sintering under the high temperature that step 3) is 900～1300 ℃ is incubated 2～6 hours, and cool to room temperature is come out of the stove.
Embodiment two
1) inert barriers preparation: the zirconic acid calcium powder is poured into fully mixing in the zirconium colloidal sol, stir, the powder liquor ratio is 4:1, and adds wetting agent and sintering aid, mix, fully wetting, be prepared into the inert barriers slip, slip is coated with hangs on the wax-pattern, spread calcium zirconate sand, drying; Repeat the inert barriers that aforesaid operations forms formwork for 3 times.
2) backing layer strengthening layer preparation: bauxite powder or colliery powder and Ludox are mixed by powder liquor ratio 2:1～6:1, fully wetting, be prepared into backing layer strengthening layer slip, be coated with slip, spread bauxite or bastard coal stone sand, drying; Repeat aforesaid operations 6 times, last one deck is coated with not stucco behind the slurry, makes the backing layer strengthening layer of formwork.
3) wax pattern removes, high temperature sintering.
The wetting agent that adds in the step 1) is 0.2～0.3 ‰ of zirconium colloidal sol gross mass;
The addition of the sintering aid that adds in the step 1) is 0.1～1% of zirconium colloidal sol gross mass.
The calcium zirconate Powder Particle Size is 200～500 orders in the step 1), and inert barriers slip flow cup viscosity is 30～100s, and the stucco granularity is 40～150 orders;
The drying room temperature is 20～26 ℃ in the step 1), and drying room relative humidity is 50～85%, and the interlayer drying time is 12～24 hours;
Step 2) bauxite or colliery powder granularity are 200～500 orders in, and backing layer strengthening layer slip flow cup viscosity is 20～50s, and the stucco granularity is 30～100 orders;
Step 2) the drying room temperature is 20～26 ℃ in, and drying room relative humidity is 20～85%, and the interlayer drying time is 12～24 hours;
Sintering under the high temperature that step 3) is 900～1300 ℃ is incubated 2～6 hours, and cool to room temperature is come out of the stove.
Claims (4)
1. the preparation method of a titanium and titanium aluminium base alloy precision-investment casting calcium zirconate formwork is characterized in that preparation process is as follows:
1) inert barriers preparation: the zirconic acid calcium powder is poured into fully mixing in the zirconium colloidal sol, stir, powder liquid mass ratio is 3:1～7:1, and adding wetting agent and sintering aid, mix, fully wetting, be prepared into the inert barriers slip, wherein, wetting agent is 0.01～0.6 ‰ of zirconium colloidal sol gross mass, the addition of sintering aid is 0.1～1% of zirconium colloidal sol gross mass, and the calcium zirconate Powder Particle Size is 200～500 orders, and inert barriers slip flow cup viscosity is 30～100s, this slip is coated with hangs on the wax-pattern, spread calcium zirconate sand, the stucco granularity is 40～150 orders, drying; Repeat the inert barriers that aforesaid operations forms formwork for 2～4 times;
2) backing layer strengthening layer preparation: bauxite powder or colliery powder and Ludox are mixed by powder liquid mass ratio 2:1～6:1, fully wetting, be prepared into backing layer strengthening layer slip, bauxite or colliery powder granularity are 200～500 orders, backing layer strengthening layer slip flow cup viscosity is 20～50s, be coated with slip, spread bauxite or bastard coal stone sand, the stucco granularity is 30～100 orders; Dry; Repeat aforesaid operations 3～8 times, last one deck is coated with not stucco behind the slurry, makes the backing layer strengthening layer of formwork;
3) wax pattern removes, high temperature sintering.
According to claim 1 described in the preparation method of titanium and titanium aluminium base alloy precision-investment casting calcium zirconate formwork, it is characterized in that, drying room temperature in the described inert barriers preparation is 20～26 ℃, and drying room relative humidity is 50～85%, and the interlayer drying time is 12～24 hours.
According to claim 1 described in the preparation method of titanium and titanium aluminium base alloy precision-investment casting calcium zirconate formwork, it is characterized in that, drying room temperature in the described backing layer strengthening layer preparation is 20～26 ℃, and drying room relative humidity is 20～85%, and the interlayer drying time is 12～24 hours.
According to claim 1 described in the preparation method of titanium and titanium aluminium base alloy precision-investment casting calcium zirconate formwork, it is characterized in that the sintering under 900～1300 ℃ high temperature of the shell after described wax pattern removes is incubated 2～6 hours, cool to room temperature is come out of the stove.
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Cited By (9)
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| CN103537620A (en) * | 2013-09-30 | 2014-01-29 | 中国航空工业集团公司北京航空材料研究院 | Preparation method for precision casting of mold shell through directional solidification investment casting of titanium-aluminum based alloy |
| CN103817290A (en) * | 2014-03-17 | 2014-05-28 | 中国科学院金属研究所 | Preparation method for precision casting of large-size thin-wall titanium alloy bucket body structure |
| CN103934417A (en) * | 2014-04-14 | 2014-07-23 | 南京宝泰特种材料股份有限公司 | Production method of titanium precision castings by rapid molding |
| CN104907495A (en) * | 2015-07-14 | 2015-09-16 | 哈尔滨工业大学 | Preparation method of TiAl alloy investment casting shell |
| CN105081217A (en) * | 2014-12-15 | 2015-11-25 | 中国航空工业集团公司北京航空材料研究院 | Machining method of precise casting combined cast of sprue offset casting system |
| CN105170908A (en) * | 2015-08-21 | 2015-12-23 | 北京星航机电装备有限公司 | Preparation method for titanium alloy precision casting calcium zirconate shell of polystyrene pattern |
| CN105499499A (en) * | 2015-12-08 | 2016-04-20 | 中国航空工业集团公司北京航空材料研究院 | Precise forming method for titanium-aluminum intermetallic compounds |
| CN106769279A (en) * | 2016-11-16 | 2017-05-31 | 中国航空工业集团公司北京航空材料研究院 | A kind of method for preparing ceramic shell sample |
| CN107983914A (en) * | 2017-11-30 | 2018-05-04 | 中国科学院金属研究所 | A kind of manufacture method of shell backing layer for the big module casting of high temperature alloy and application |
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| CN103537620A (en) * | 2013-09-30 | 2014-01-29 | 中国航空工业集团公司北京航空材料研究院 | Preparation method for precision casting of mold shell through directional solidification investment casting of titanium-aluminum based alloy |
| CN103817290B (en) * | 2014-03-17 | 2016-01-20 | 中国科学院金属研究所 | A kind of hot investment casting preparation method of large size thin-walled titanium alloy bucket body structure |
| CN103817290A (en) * | 2014-03-17 | 2014-05-28 | 中国科学院金属研究所 | Preparation method for precision casting of large-size thin-wall titanium alloy bucket body structure |
| CN103934417A (en) * | 2014-04-14 | 2014-07-23 | 南京宝泰特种材料股份有限公司 | Production method of titanium precision castings by rapid molding |
| CN103934417B (en) * | 2014-04-14 | 2016-01-20 | 南京宝泰特种材料股份有限公司 | A kind of titanium precision castings preparation method of rapid shaping |
| CN105081217B (en) * | 2014-12-15 | 2017-04-26 | 中国航空工业集团公司北京航空材料研究院 | Machining method of precise casting combined cast of sprue offset casting system |
| CN105081217A (en) * | 2014-12-15 | 2015-11-25 | 中国航空工业集团公司北京航空材料研究院 | Machining method of precise casting combined cast of sprue offset casting system |
| CN104907495A (en) * | 2015-07-14 | 2015-09-16 | 哈尔滨工业大学 | Preparation method of TiAl alloy investment casting shell |
| CN105170908A (en) * | 2015-08-21 | 2015-12-23 | 北京星航机电装备有限公司 | Preparation method for titanium alloy precision casting calcium zirconate shell of polystyrene pattern |
| CN105499499A (en) * | 2015-12-08 | 2016-04-20 | 中国航空工业集团公司北京航空材料研究院 | Precise forming method for titanium-aluminum intermetallic compounds |
| CN105499499B (en) * | 2015-12-08 | 2017-10-03 | 中国航空工业集团公司北京航空材料研究院 | A kind of Ti-Al series metal compounds casting method for precisely forming |
| CN106769279A (en) * | 2016-11-16 | 2017-05-31 | 中国航空工业集团公司北京航空材料研究院 | A kind of method for preparing ceramic shell sample |
| CN107983914A (en) * | 2017-11-30 | 2018-05-04 | 中国科学院金属研究所 | A kind of manufacture method of shell backing layer for the big module casting of high temperature alloy and application |
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Application publication date: 20130320 |