CN2629875Y - silicon carbide section mould for directional solidification - Google Patents
silicon carbide section mould for directional solidification Download PDFInfo
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- CN2629875Y CN2629875Y CN 03211791 CN03211791U CN2629875Y CN 2629875 Y CN2629875 Y CN 2629875Y CN 03211791 CN03211791 CN 03211791 CN 03211791 U CN03211791 U CN 03211791U CN 2629875 Y CN2629875 Y CN 2629875Y
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- silicon carbide
- directional solidification
- shell
- layer
- section mould
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Abstract
The utility model relates to a directional silicon-carbide model shell, which is characterized in that the shell wall of the model shell is made of silicon-carbide material and is provided with a laminated structure; and the silicon-carbide layer is also provided with a white sapphire layer. The utility model has adequate intensity and good heat conductivity and thereby is fit to cast the large-size directional crystallization parts.
Description
Technical field:
The utility model relates to the foundry engieering of metal, and a kind of alloy directionally solidified silicon carbide section mould that is used for is provided especially.
Background technology:
The energy is the power of the development of the national economy, and industrial high performance gas-turbine engine is one of clean at present energy power system, the manufacturing technology of the empty engine blade of the main source of gas-turbine wheel manufacturing technology pilotage.Therefore, Xian Jin high temperature alloy directional solidification technique also is used to develop industrial gas turbine engine bucket.The directional solidification of blade is meant controls direction of heat flow in casting process, make crystallization along the growth of parallel blade principal axes of stress direction, forms the foundry engieering of the columnar structure of oriented growth.Because the blade of directional solidification crystalline structure has been eliminated horizontal crystal boundary, thereby its performance and all being greatly improved service life.
Directional solidification is normally carried out in vaccum sensitive stove, and the directional solidification process is to control hot-fluid with the purpose that reaches crystallographic orientation by heat radiation.The heat radiation of directional solidification process can be divided into three phases:
Open stage beginning, opening stage beginning of directional solidification, heat mainly sheds by the chassis of water mold, and foundry goods carries out heat exchange by the heat conduction with crystallizer.This stage is based on the heat conduction, is auxilliary with the heat radiation of casting mold.So the initial period of directional solidification is the stage based on the heat conduction.
Interstage, prolongation along with the directional solidification time, the part of solidifying of foundry goods increases, the liquid-solid boundary of crystallographic orientation solidification zone is more and more far away apart from crystallizer, the influence of crystallizer cooling capacity weakens gradually, the heat exchange pattern heat radiation also constantly diminishes, and the influence of the heat radiation of casting mold heat radiation strengthens gradually.When casting solidification reaches when middle part, the heat conduction and the heat radiation of casting mold of crystallizer were dispelled the heat to play a role jointly and were kept the foundry goods directional solidification and proceed this moment.So the interstage of directional solidification plays a role jointly with heat conduction and heat radiation.
Final stage, when the final stage that is directionally solidified into of foundry goods, heat radiation and the initial period of this moment have reversed, and it is the heat radiation heat radiation based on casting mold, and the heat conducting and radiating of crystallizer is auxilliary.Therefore, the final stage of foundry goods directional solidification is the stage based on heat radiation.
The radiating mode difference of the three phases of directional solidification, the heat-sinking capability difference, the upgrowth situation of cylindrulite is also different.Basically be that the last stage is thin, after-stage is thick.For the small size blade of aero-engine, the radiating mode of directional solidification is in the early stage of opening stage beginning and interstage, and the heat-sinking capability of casting mold also is not outstanding especially to the influence of directional solidification, and the casting mold of existing corundum material still is feasible.But for the large scale linear leaf of industrial high performance gas-turbine engine, for stability and the efficient that guarantees its crystallographic orientation, it is particularly important that the raising of casting mold heat-sinking capability just seems.
Further, the technology crux of directional solidification is the thermograde in the control solidification zone liquid phase.Thermograde is big more, and it is straight and upright more, fine and close more that cylindrulite is grown.For quality and the efficient that guarantees directional solidification, generally all manage to improve the thermograde of directional solidification.Improving the thermograde usual practice is the heating-up temperature that improves the casting mold heater, improves the pouring temperature of alloy and the capacity of heat transmission of raising crystallizer etc.Advanced directional solidification technique is to adopt the liquid metal cooling method.Be about to casting mold and crystallizer and pull out in the direct later on immersion low melting point of heater, the higher boiling liquid metal, utilize the thermal capacity of metal to make the solidification zone Quench, the thermograde of liquid phase is increased substantially.The method of above-mentioned raising thermograde all must realize by the heat absorption and the heat radiation of casting mold.Therefore, under similarity condition, the thermal conductivity that improves casting mold plays an important role for the thermograde that improves the solidification zone liquid phase.This is because the thermal conductivity of casting mold is strong, can dwindle the scope of solidification zone, helps improving thermograde; The casting mold thermal conductivity helps to strengthen solidifying the heat conduction of foundry goods by force simultaneously, also helps improving thermograde.In addition, improve the thermal conductivity of casting mold, help improving the thermograde of directional solidification, also help the cylindrulite growth.This is that dendritic growth needs local overcooling because cylindrulite is made of dendrite, and degree of supercooling is big more, and dendrite is thin more, and mechanical property is good more, and local overcooling is caused by cooldown rate, and cooldown rate is directly related with the heat-sinking capability of casting mold.This shows that the thermal conductivity that improves casting mold is the important measures that improve blades oriented crystalline quality and efficient.
The technology contents of invention:
The purpose of this utility model provides a kind of directional solidification silicon carbide section mould, and it has enough intensity and good thermal conductivity, and cost is lower, is particularly suitable for casting large-sized directional solidification crystallization part.
The utility model specifically provides a kind of directional solidification silicon carbide section mould, it is characterized in that: the shell wall of this shell is carbofrax material and has layer structure.
The utility model directional solidification can also be lined with corundum layer with in the silicon carbide section mould in the described silicon carbide layer.Total number of plies of shell shell wall is 3～30, and wherein having one deck at least is silicon carbide layer; Every bed thickness 0.5～1.5mm, total wall thickness is 3～30mm.And shell wall from inside to outside successively thickens.Can use one of silica, corundum, carbonization silica sand kind or multiple bonding between layer and the layer.
The utility model directional solidification is divided into full shell and half shell carborundum with silicon carbide section mould, be to be bonding agent with the Ludox slurry, full shell silicon carbide section mould is the carbonization silica sand of the corresponding granularity of successively spreading from the inside to the outside, and half shell silicon carbide section mould is that only which floor spreads with corresponding carbonization silica sand at outermost; Then, put into heating furnace and be heated to 950～1600 ℃, be incubated 30～60 minutes, taking-up is made, and therefore the finished product shell has layer structure.Because carborundum is a kind of black crystals, has higher thermal emissivity rate, and has higher refractoriness simultaneously, the lower coefficient of expansion and than characteristics such as stable chemical property, therefore, the prepared silicon carbide section mould that goes out has enough intensity and good thermal conductivity, is suitable for casting large-sized crystallographic orientation spare, in addition because the carborundum wide material sources, thus with low cost.
Description of drawings:
Fig. 1 is the shell wall cross-section structure signal of full shell large scale directional solidification with silicon carbide section mould;
Fig. 2 is full shell large scale directional solidification with silicon carbide section mould and directional crystalli zation blade photo;
Fig. 3 is the shell wall cross-section structure signal of half shell large scale directional solidification with silicon carbide section mould;
Fig. 4 is half shell large scale directional solidification with silicon carbide section mould and directional crystalli zation blade photo.
The specific embodiment:
Embodiment 1
Ludox mixes stirring with schmigel, reach 30 seconds (measuring viscosity with the Chinese Industrial Standards (CIS) flow cup) until viscosity, makes slurry.On the wax pattern (300mm is long) of industrial gas turbine engine bucket, be coated with the hanging material, spread one deck 60～80# carborundum powder, 3 times repeatedly; Be coated with the hanging material, spread the 36# carborundum powder, 3 times repeatedly; Be coated with the hanging material, spread the 24# carborundum powder, 6 times repeatedly; Put into heating furnace and be warmed up to 950～1050 ℃ of insulations 30 minutes, obtain the silicon carbide section mould of the full silicon carbide layer (1) of 12 layers of structure, cross-section structure is seen Fig. 1, and external form is seen Fig. 2.See Fig. 2 with this shell directional solidification DZM41 alloy vane photo, dendrite of its metallographic structure is thin, and secondary dendrite is short, and carbide is thin, and the carbide eutectic is few.
Embodiment 2
With embodiment 1 different being, substitute the carbonization silica sand with schmigel earlier, still use the carbonization silica sand behind the layer 6, finally obtain the silicon carbide section mould of partial carbonization silicon layer (1) half corundum layer (2) of 12 layers of structure, cross-section structure is seen Fig. 3, external form is seen Fig. 4.See Fig. 4 with this shell directional solidification DZM41 alloy vane photo, dendrite of its metallographic structure is thin, and secondary dendrite is long, and carbide is little, and the carbide eutectic is many slightly.
Claims (5)
1, a kind of directional solidification silicon carbide section mould is characterized in that: the shell wall of this shell is carbofrax material and has layer structure.
2, according to the described directional solidification silicon carbide section mould of claim 1, it is characterized in that: described silicon carbide layer liner corundum layer.
3, according to claim 1 or 2 described directional solidification silicon carbide section moulds, it is characterized in that: total number of plies of described shell shell wall is 3～30, and wherein having one deck at least is silicon carbide layer; Every bed thickness 0.5～1.5mm, total wall thickness is 3～30mm.
4, according to the described directional solidification silicon carbide section mould of claim 3, it is characterized in that: described shell shell wall from inside to outside successively thickens.
5, according to claim 1 or 2 described directional solidification silicon carbide section moulds, it is characterized in that: use one of silica, corundum, carbonization silica sand kind or multiple bonding between described layer and the layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03211791 CN2629875Y (en) | 2003-03-10 | 2003-03-10 | silicon carbide section mould for directional solidification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03211791 CN2629875Y (en) | 2003-03-10 | 2003-03-10 | silicon carbide section mould for directional solidification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2629875Y true CN2629875Y (en) | 2004-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03211791 Expired - Lifetime CN2629875Y (en) | 2003-03-10 | 2003-03-10 | silicon carbide section mould for directional solidification |
Country Status (1)
| Country | Link |
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| CN (1) | CN2629875Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103192062A (en) * | 2013-04-01 | 2013-07-10 | 东方电气集团东方汽轮机有限公司 | Mold case for producing high-temperature alloy single crystal blades |
| CN101885037B (en) * | 2009-01-06 | 2015-04-01 | 通用电气公司 | Casting molds for use in directional solidification processes and methods of making |
| CN106493284A (en) * | 2016-11-24 | 2017-03-15 | 武汉科技大学 | A kind of nucleocapsid structure spherical quartz molding sand and preparation method thereof |
| CN108746564A (en) * | 2018-05-03 | 2018-11-06 | 清华大学 | The method for realizing directional solidification based on 3D printing multilayer hollow shell mould |
-
2003
- 2003-03-10 CN CN 03211791 patent/CN2629875Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101885037B (en) * | 2009-01-06 | 2015-04-01 | 通用电气公司 | Casting molds for use in directional solidification processes and methods of making |
| CN103192062A (en) * | 2013-04-01 | 2013-07-10 | 东方电气集团东方汽轮机有限公司 | Mold case for producing high-temperature alloy single crystal blades |
| CN106493284A (en) * | 2016-11-24 | 2017-03-15 | 武汉科技大学 | A kind of nucleocapsid structure spherical quartz molding sand and preparation method thereof |
| CN108746564A (en) * | 2018-05-03 | 2018-11-06 | 清华大学 | The method for realizing directional solidification based on 3D printing multilayer hollow shell mould |
| CN108746564B (en) * | 2018-05-03 | 2019-07-12 | 清华大学 | The method for realizing directional solidification based on 3D printing multilayer hollow shell mould |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20030310 |
|
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20030310 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |