CN2901207Y - Combined pyrogenic boron nitride crucible inner lining - Google Patents
Combined pyrogenic boron nitride crucible inner lining Download PDFInfo
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- CN2901207Y CN2901207Y CN 200620053249 CN200620053249U CN2901207Y CN 2901207 Y CN2901207 Y CN 2901207Y CN 200620053249 CN200620053249 CN 200620053249 CN 200620053249 U CN200620053249 U CN 200620053249U CN 2901207 Y CN2901207 Y CN 2901207Y
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- boron nitride
- crucible
- pyrolytic boron
- titanium
- brick
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Abstract
The utility model discloses a composite pirolysis boron nitride crucible liner, which belongs to a melting crucible material with titanium and titanium alloy, in particular the combinational pirolysis boron nitride crucible liner. The crucible liner is a crateriform structure capable of containing titanium and titanium liquid which is stacked by the pirolysis boron nitride bricks. The utility model can be arranged in a shell capable of thermal insulation, heat preservation and load-carrying, and can meet the industrial production needs of large volume, low cost, easy maintenance and long lifetime. The utility model has the advantages of fabrication process maturity, simple device, stable performance and convenient maintenance. Titanium and titanium alloy do not bond the crucible liner and forms a large molten pool in the crucible liner, and alloying elements can be spread easily, and the alloys melted and poured has uniform composition and stable performance.
Description
Technical field
The utility model belongs to titanium or titanium alloy melting kettle material, particularly relates to pyrolytic boron nitride crucible lining.
Background technology
Because the fusing point of titanium is high and chemical property is very active; liquid titanium almost can all react with refractory material such as zirconia, magnesia, silica and aluminium oxide with all crucibles when its melting; therefore, cause its melting can not adopt the crucible of conventional refractory material manufacturing to carry out vacuum induction melting.Vacuum consumable electrode electric arc skull melting and the cooling of Forced water cooling copper crucible are often adopted in present industrial titanium or titanium alloy melting.Earlier on copper mould wall, solidify skim " scull " during the vacuum arc skull melting, play protection titanium liquid and do not polluted and heat-blocking action, so that in crucible, form a molten bath by crucible material.Make titanium liquid temp field inhomogeneous because water jacketed copper crucible cools off very fast and forms scull, add that titanium alloy is short in the liquid retention time, feasible cast back titanium alloy casting uneven components.Uneven components is very big to the performance impact of alloy, and is very sensitive to composition as the transformation temperature of Ti-Ni marmem.Specific energy consumption is big mutually with vacuum induction melting for the vacuum arc skull melting, and the smelting titanium alloy power consumption is 40～60kw/kg.For addressing the above problem, the someone proposes to make the titanium or titanium alloy melting kettle with calcium oxide.But calcium oxide is difficult to sinter molding, and lime crucible is easy to hydrolysis under air, and oxygen content can increase in the titanium alloy of this external application lime crucible melting, influences the performance of titanium alloy.The inventor discloses a kind of titanium or titanium alloy melting kettle material and has reached the manufacture method of being made crucible by this material in Chinese patent ZL200410025119.0, adopting boron nitride and an amount of flux is raw material, by be pressed into the crucible blank through isostatic cool pressing, 1800 ℃ of following sintering 1 hour, get final product the melting kettle finished product, and on laboratory scale is used, obtained good effect, have under the high temperature and titanium does not react, not with alloy bonding; Energy consumption is low, the alloying component behind the smelting and pouring is even, the advantage of stable performance.But the technology of above-mentioned patent disclosure, owing to adopt boron nitride to add the technical scheme of the whole crucible of manufacturing of an amount of flux thermal sintering behind the isostatic cool pressing base, can't satisfy industrial production requirement, because the required melting kettle volume of industrialized production is big, adopt the technology of patent ZL200410025119.0 to be difficult to manufacture, its reason is: (1), suitability for industrialized production use crucible (generally being unit with ton) volume big, equipment such as required isostatic cool pressing that boron nitride crucible is whole when making, sintering require high price expensive, and equipment will be made especially.(2), boron nitride crucible made in one piece is too expensive, in case damage and can't repair, must integral replacing, financial cost is uneconomical.(3), easily crack in boron nitride crucible manufacturing made in one piece and the use.
In addition, Zhao Fengming etc. discloses the Preliminary Applications effect of a kind of pyrolytic boron nitride crucible in the titanium or titanium alloy melting and a kind of manufacture method of pyrolytic boron nitride crucible in document " application of pyrolytic boron nitride crucible in extraordinary melting " and " growth of pyrolytic boron nitride crucible material and performance " 2 pieces of papers.Pyrolytic boron nitride (PBN) crucible has many particular performances, as: the pyrolytic boron nitride crucible has the stability of fabulous chemistry and heat, 3000 ℃ of distillations, and its intensity improves with the rising of temperature, and when temperature was 2200 ℃, intensity reached maximum; Acid and alkali resistance at room temperature, salt and organic reagent are convenient to store, and be at high temperature acidproof; Pyrolytic boron nitride crucible density height, pore-free, its density is near the solid density (2.27g/cm of material
3), the metal of molten condition be difficult to infiltrate in the sidewall of crucible, when with monkey melting titanium or titanium alloy, even also very easily pours out in the situation that cools to room temperature with the furnace, and the crucible inwall is bright and clean, does not have the bonding phenomenon, does not stay residue, and crucible cleans easily, can use repeatedly; Compare with the boron nitride crucible of thermal sintering after the process isostatic cool pressing, the pyrolytic boron nitride crucible is at mechanics, aspect of performance such as calorifics and electricity has tangible anisotropy, also have microwave and ultrared superperformance simultaneously, differ about 20 times at deposition direction with perpendicular to the thermal conductivity on the depositional plane direction, that is to say that crucible surface is the good conductor of heat, and be insulator perpendicular to the crucible surface direction, when with this crucible for smelting titanium, the inner thermal field of crucible is even, and heat is difficult to shed by sidewall of crucible, so improved heat-insulating property, can save electric power nearly 1/2nd; The thermal shock resistance of PBN crucible is good in addition, does not directly see crackle in the input water for 2000 ℃.
The same with the disclosed technology of Chinese patent ZL200410025119.0, Zhao Fengming etc. disclose a kind of pyrolytic boron nitride crucible in document " application of pyrolytic boron nitride crucible in extraordinary melting " and " growth of pyrolytic boron nitride crucible material and performance " be boron nitride crucible made in one piece, only be suitable for laboratory and small lot batch manufacture, in industrial-scale production, all there are the boron nitride crucible made in one piece three big shortcomings of touching upon previously, thereby need improve existing technology, propose new technical scheme, improve the shortcoming of prior art.
Summary of the invention
The purpose of this utility model is to provide a kind of combined pyrolytic boron nitride crucible lining, to satisfy industrialization, big volume, low cost, easy-maintaining, long requirement of life-span.
Combined pyrolytic boron nitride crucible lining, described crucible lining are the cup-shaped structure that can adorn titanium or titanium alloy liquid that is piled into the pyrolytic boron nitride brick.
---can form the location structure of concavo-convex cooperation between the described pyrolytic boron nitride brick.
---described crucible lining is cup-shaped structure or the cup-shaped structure of double-deck brick formation or the cup-shaped structure that two-layer above brick forms that forms with the individual layer brick that the pyrolytic boron nitride brick is piled into.
---described pyrolytic boron nitride brick adopts the chemical vapor deposition method manufacturing.
---described pyrolytic boron nitride brick is to adopt the pyrolytic boron nitride blank of chemical vapor deposition method manufacturing by being machined to the brick shape that can assemble mutually.
---the outer surface of described crucible lining is enclosed with the housing with thermal insulation, insulation, load function that is complementary with the crucible lining shape.
Advantage of the present utility model is:
(1), the manufacturing process maturation of undersized pyrolytic boron nitride brick, elevated temperature strength is big.With with boron nitride powder be raw material add an amount of flux by the isostatic cool pressing base after the sintered boron nitride brick of sinter molding manufacturing compare, performance is excellent more.The density of sintered boron nitride brick is lower than pyrolysis boron nitride brick, and the voidage height; Particularly contain the low melting point flux, reduced sintered boron nitride brick elevated temperature strength, chemical stability and heat endurance and thermal shock resistance; The sintered boron nitride brick is that each is to going together at aspect of performances such as mechanics, calorifics and electricity.Thereby, the pyrolytic boron nitride brick is compared with the sintered boron nitride brick higher elevated temperature strength, better thermal shock resistance, better scour resistance, better stability, the pyrolytic boron nitride brick of chemistry and heat have tangible anisotropy at aspect of performances such as mechanics, calorifics and electricity, it is even to be with the pyrolytic boron nitride brick that liner is piled up the inner thermal field of combined pyrolytic boron nitride crucible of assembling, and heat is difficult to shed by sidewall of crucible, improved heat-insulating property, it is nearly 1/2nd to save electric power, is more suitable for the melting in titanium or titanium alloy.
(2) the pyrolytic boron nitride brick can manufacture the concavo-convex location structure that cooperatively interacts, and conveniently is piled into the liner of crucible, also conveniently pulls down replacing when damaging, and maintenance cost is low.
(3) can be piled into the big crucible (generally being unit with ton) that suitability for industrialized production is used, cost is low.
(4) pyrolytic boron nitride brick volume is little, is not easy to crack in the manufacturing and the use, and crucible life is long.
(5) can form big molten bath in the crucible lining of the utility model, be convenient to the diffusion of alloying element, the alloying component behind the smelting and pouring is even, and alloy property is stable.Simultaneously the pyrolytic boron nitride liner and the titanium of crucible do not react, not with alloy bonding, and " scull " phenomenon that occurs during no Forced water cooling copper crucible melting titanium or titanium alloy, lumber recovery height.
(6) greatly reduce energy consumption, the power consumption during the titanium or titanium alloy melting only is 2～3kw/kg.
Description of drawings
Fig. 1 is the structural representation of the crucible lining of the utility model.
The structural representation of the crucible lining of the utility model that Fig. 2 is piled into for double-deck brick.
Fig. 3 is the structural representation of the crucible lining of the utility model of being piled into of three layers of brick.
Fig. 4 is the structural representation of the square pyrolytic boron nitride brick of the crucible lining of formation the utility model.
Fig. 5 is the structural representation of the square pyrolytic boron nitride brick of the band groove of the crucible lining of formation the utility model.
Fig. 6 is the structural representation of the square pyrolytic boron nitride brick of the band fin of the crucible lining of formation the utility model.
Fig. 7 is the structural representation of the square pyrolytic boron nitride brick of the band fin of the crucible lining that constitutes the utility model and groove.
Fig. 8 is the structural representation of the arc pyrolytic boron nitride brick of the crucible lining of formation the utility model.
Fig. 9 is the structural representation of the arc pyrolytic boron nitride brick of the band groove of the crucible lining of formation the utility model.
Figure 10 is the structural representation of the arc pyrolytic boron nitride brick of the band groove of the crucible lining of formation the utility model.
Figure 11 is the schematic diagram of piling up method of the crucible lining of the utility model.
Figure 12 is placed in the interior structural representation of crucible housing for the crucible lining of the utility model.
Among the above-mentioned figure: 1 is the liner of the crucible of the utility model, and 2 is the pyrolytic boron nitride brick that constitutes the crucible lining of the utility model, and 3 is housing, and 4 is groove, and 5 is fin.
The specific embodiment
The manufacturing of pyrolytic boron nitride brick
Adopt the blank of the pyrolytic boron nitride brick of chemical vapor deposition method manufacturing, be machined to required shape and size then, can obtain the pyrolytic boron nitride brick, specific as follows:
With high-purity unstrpped gas BCl
3And NH
3, it is indoor that mixing feeds pyroreaction according to a certain percentage, and the temperature of reative cell is up to 2000 ℃, and mist is undertaken by following chemical reaction equation in reative cell:
BCl
3+NH
3＝BN+3HCl
In the growth course of pyrolytic boron nitride (PBN) material, people always get used to it is likened to snow, the little snowflake of hexagon BN of growth in promptly reacting, constantly heap drops on the graphite matrix (core) of heating, prolongation along with the time, accumulation horizon has promptly formed the housing of pyrolytic boron nitride in thickening, the demoulding take off promptly be independently, pure pyrolytic boron nitride blank.Pyrolytic boron nitride has good machinability, and the pyrolytic boron nitride blank is processed into the shape and size of drawing requirement, has promptly obtained the required pyrolytic boron nitride brick of the utility model.
The chemical vapor deposition of pyrolytic boron nitride material not only simply but also complicated.Equipment is simple, and principle is simple, and is simple to operate; But the influence factor complexity of technology, for example, the putting position of the size of the intake method of raw material, charging mode, burner hearth, geometry, core and mode or the like all will exert an influence to gas deposition, also can cause scrapping of whole stove when serious.But gas deposition main influences temperature, the pressure in the stove and the flow-rate ratio of gas that parameter still is a matrix.Generally select 1800～1900 ℃ of temperature for use, furnace pressure 1～2mmHg, the flow of gas will be decided on the size of furnace space, sedimental requirement, for the pyrolytic boron nitride brick that the growth crucible liner is used, selects high-temperature technology usually for use.
The pyrolytic boron nitride brick can have different geometries, particularly can be designed to the shape that can locate mutually of concavo-convex cooperation, not only can conveniently be piled into liner, and is convenient to change after the damage of pyrolytic boron nitride brick.With reference to figure 4 to Figure 10.
The manufacturing of combined pyrolytic boron nitride crucible lining
With ready-made pyrolytic boron nitride brick, pile up assembling by the crucible Design Requirement Drawing, promptly obtain the combined pyrolytic boron nitride crucible lining of the utility model.
When adopting the pyrolytic boron nitride brick to pile up liner, can pile up, also can adopt bilayer or multilayer pyrolytic boron nitride brick to pile up, can decide according to the size and the capacity of the crucible that specifically will pile up with individual layer pyrolytic boron nitride brick.Referring to figs. 1 to Fig. 3
The application of combined pyrolytic boron nitride crucible lining
The combined pyrolytic boron nitride crucible lining that assembles is installed in the shell that is complementary with it, and housing can adopt refractory material (as graphite, calcium oxide, zirconia etc.) manufacturing, reaches the function of thermal insulation, insulation, load.Housing can reduce the diffusion of heat, saves the energy, and helps keeping the temperature in titanium or titanium alloy molten bath, and promptly obtaining with the combined pyrolytic boron nitride is the crucible of liner, can be used for the melting of titanium or titanium alloy.It is 2-3kw/kg that this crucible installation is placed vaccum sensitive stove smelting titanium alloy, its average power consumption.The liner of crucible does not at high temperature react with titanium during melting, not with alloy bonding.The molten bath good fluidity, the alloying component behind the smelting and pouring is even, stable performance.
Should be noted that herein openly can replace with the identical structure of other effect that the embodiment that while the utility model is introduced realizes unique structure of the present utility model with the structure of explanation.Though preferential embodiment of the present utility model is introduced in this article and is illustrated; but those skilled in the art know and know that these embodiment illustrate; those skilled in the art can make countless variations, improvement and replacement; and can not break away from the utility model; therefore, should be according to the next qualification protection domain of the present utility model of the spirit and scope of the utility model appending claims.
Claims (4)
1, combined pyrolytic boron nitride crucible lining is characterized in that, described crucible lining is the cup-shaped structure that can adorn titanium or titanium alloy liquid that is piled into the pyrolytic boron nitride brick.
2, combined pyrolytic boron nitride crucible lining according to claim 1 is characterized in that, can form the location structure of concavo-convex cooperation between the described pyrolytic boron nitride brick.
3, combined pyrolytic boron nitride crucible lining according to claim 1, it is characterized in that described crucible lining is cup-shaped structure or the cup-shaped structure of double-deck brick formation or the cup-shaped structure that two-layer above brick forms that forms with the individual layer brick that the pyrolytic boron nitride brick is piled into.
4, combined pyrolytic boron nitride crucible lining according to claim 1 is characterized in that, the outer surface of described crucible lining is enclosed with the housing with thermal insulation, insulation, load function that is complementary with the crucible lining shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620053249 CN2901207Y (en) | 2006-01-04 | 2006-01-04 | Combined pyrogenic boron nitride crucible inner lining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620053249 CN2901207Y (en) | 2006-01-04 | 2006-01-04 | Combined pyrogenic boron nitride crucible inner lining |
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| Publication Number | Publication Date |
|---|---|
| CN2901207Y true CN2901207Y (en) | 2007-05-16 |
Family
ID=38085372
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620053249 Expired - Fee Related CN2901207Y (en) | 2006-01-04 | 2006-01-04 | Combined pyrogenic boron nitride crucible inner lining |
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| Country | Link |
|---|---|
| CN (1) | CN2901207Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839642B (en) * | 2009-03-20 | 2015-03-18 | 通用电气公司 | Fire-clay crucible capable of reacting thermal stress and being suitable for melting alloy with high activity |
-
2006
- 2006-01-04 CN CN 200620053249 patent/CN2901207Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839642B (en) * | 2009-03-20 | 2015-03-18 | 通用电气公司 | Fire-clay crucible capable of reacting thermal stress and being suitable for melting alloy with high activity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070516 Termination date: 20110104 |