CN107414017A - A kind of titanium alloy fine casting composite shell - Google Patents
A kind of titanium alloy fine casting composite shell Download PDFInfo
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- CN107414017A CN107414017A CN201710688353.9A CN201710688353A CN107414017A CN 107414017 A CN107414017 A CN 107414017A CN 201710688353 A CN201710688353 A CN 201710688353A CN 107414017 A CN107414017 A CN 107414017A
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- titanium alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The present invention relates to precision casting technology field, disclose a kind of titanium alloy fine casting composite shell, high temperature hot pressing processing is carried out to silicon nitride and boron nitride and is used as refractory material, adhesive is used as using Ludox, the coating that powder liquor ratio is 1.3 1.4g/ml is prepared, often be coated with after one layer of stucco, carry out primary drying process, roasting technique is divided into two stages, it is fine and close to be calcined obtained shell surfacing, there is no obvious crackle, facilitate being normally carried out for cast, avoid leakage, runout etc. influences the problem of casting quality, it ensure that the quality of casting, the present invention carries out hot-pressing processing to common nitride, so that nitride powder shape is significantly improved, specific surface area is greatly reduced, so that nitride shows the advantages of prominent in titanium investment fine casting shell material.
Description
Technical field
The invention belongs to precision casting technology field, and in particular to a kind of titanium alloy fine casting composite shell.
Background technology
Titanium is a kind of important structural metal to grow up the 1950s, and titanium alloy is because high, anti-corrosion with intensity
The features such as property is good, heat resistance is high and be widely used in every field.Many countries all recognize the weight of titanium alloy material in the world
The property wanted, it is researched and developed in succession, and be applied.Titanium alloy is that other elements are added based on titanium elements
The alloy of composition.Titanium has two kinds of allomorphisms：Titanium is isomer, and fusing point is 1668 DEG C, is in solid matter when less than 882 DEG C
Hexagonal lattice structure, referred to as α-titanium；It is in body-centered cubic character structure, referred to as β-titanium more than 882 DEG C.Utilize the above two of titanium
The different characteristics of structure, appropriate alloying element is added, its phase transition temperature and constituent content is gradually changed and is obtained different groups
The titanium alloy knitted.
Titanium alloy precise-investment casting technique is the important method of titanium alloy shaping, and wherein the selection of shell Material is for titanium
The performance important of alloy-steel casting, shell of the current application on Ti alloy casting use high temperature resistant refractory material more,
Such as zirconium oxide, graphite block, but there is cost is high, processing performance is poor, easily produces reaction with titanium alloy and form brittle layer
A series of problems.And common nitride specific surface area is big, poor fluidity, the Modeling Material of precision investment casting mould case is not used to.
The content of the invention
The purpose of the present invention is to be directed to the problem of existing, there is provided a kind of titanium alloy fine casting composite shell, to common nitrogen
Compound carries out hot-pressing processing so that nitride powder shape is significantly improved, and specific surface area is greatly reduced so that nitride exists
The advantages of prominent is shown in titanium investment fine casting shell material.
The present invention is achieved by the following technical solutions：
A kind of titanium alloy fine casting composite shell, high temperature hot pressing processing is carried out to silicon nitride and boron nitride and is used as refractory material, is used
Ludox is prepared the coating that powder liquor ratio is 1.3-1.4g/ml, is often coated with after one layer of stucco, carries out one as adhesive
Secondary drying process, roasting technique are divided into two stages：When heating-up temperature is below 850 DEG C, roasting medium is air；Heating temperature
After degree is higher than 850 DEG C, it is calcined under nitrogen protection, when heating-up temperature reaches 1000-1100 DEG C, stops heating, be incubated 1.5-2.0
Hour, subsequent natural cooling, when in-furnace temperature is less than 800 DEG C, stopping is passed through nitrogen, after cold water is cooled to room temperature, after
Carry out titanium alloy cast.
As further improvement of these options, the composite shell is coated with layer by 7-9 and formed, and is coated with layer per thickness
Spend for 0.2-0.4 millimeters, adjacent bed and backing layer are coated with again after shell surface layer is completely dried.
As further improvement of these options, the Ludox percentage containing solid masses is 25-28%.
As further improvement of these options, it is coated with and uses natural drying mode with the drying of stucco back layer, control
Drying temperature is 25-30 DEG C, relative air humidity 55-60%, and drying time is 6-8 hours, and adjacent bed and backing layer use wind
Drying mode, it is 20-25 DEG C, relative air humidity 50-55% to control drying temperature, and drying time is 10-12 hours.
The present invention has advantages below compared with prior art：In order to solve the insufficient and common nitridation of existing refractory material
Thing can not be utilized the essence casting coatings art the problem of, the invention provides a kind of titanium alloy fine casting composite shell, to silicon nitride and
Boron nitride carries out high temperature hot pressing processing and is used as refractory material, and using Ludox as adhesive, it is 1.3- that powder liquor ratio, which is prepared,
1.4g/ml coating, often it is coated with after one layer of stucco, carries out primary drying process, roasting technique is divided into two stages, is calcined
The shell surfacing arrived is fine and close, without obvious crackle, facilitates being normally carried out for cast, avoids the shadows such as leakage, runout
The problem of ringing casting quality, ensure that the quality of casting, and the present invention carries out hot-pressing processing to common nitride so that nitride
Powder shape is significantly improved, and specific surface area is greatly reduced so that nitride shows in titanium investment fine casting shell material
The advantages of showing to protrude.
Embodiment
With reference to specific embodiment, the invention will be further described.
Embodiment 1
A kind of titanium alloy fine casting composite shell, high temperature hot pressing processing is carried out to silicon nitride and boron nitride and is used as refractory material, is used
Ludox is prepared the coating that powder liquor ratio is 1.3-1.4g/ml, is often coated with after one layer of stucco, carries out one as adhesive
Secondary drying process, roasting technique are divided into two stages：When heating-up temperature is below 850 DEG C, roasting medium is air；Heating temperature
After degree is higher than 850 DEG C, it is calcined under nitrogen protection, when heating-up temperature reaches 1000 DEG C, stops heating, be incubated 1.5 hours, then
Natural cooling, when in-furnace temperature be less than 800 DEG C when, stopping be passed through nitrogen, after cold water is cooled to room temperature, after can carry out titanium alloy
Cast.
As further improvement of these options, the composite shell is coated with layer by 7 and formed, and is coated with layer per thickness degree
For 0.2 millimeter, adjacent bed and backing layer are coated with again after shell surface layer is completely dried.
As further improvement of these options, the Ludox percentage containing solid masses is 25%.
As further improvement of these options, it is coated with and uses natural drying mode with the drying of stucco back layer, control
Drying temperature is 25 DEG C, and relative air humidity 55%, drying time is 6 hours, and adjacent bed and backing layer use wind drying mode,
It is 20 DEG C to control drying temperature, relative air humidity 50%, and drying time is 10 hours.
Embodiment 2
A kind of titanium alloy fine casting composite shell, high temperature hot pressing processing is carried out to silicon nitride and boron nitride and is used as refractory material, is used
Ludox is prepared the coating that powder liquor ratio is 1.35g/ml, is often coated with after one layer of stucco, is once done as adhesive
Drying process, roasting technique are divided into two stages：When heating-up temperature is below 850 DEG C, roasting medium is air；Heating-up temperature is high
After 850 DEG C, it is calcined under nitrogen protection, when heating-up temperature reaches 1050 DEG C, stops heating, be incubated 1.8 hours, it is then natural
Cooling, when in-furnace temperature is less than 800 DEG C, stopping is passed through nitrogen, after cold water is cooled to room temperature, after can carry out titanium alloy and pour
Note.
As further improvement of these options, the composite shell is coated with layer by 8 and formed, and is coated with layer per thickness degree
For 0.3 millimeter, adjacent bed and backing layer are coated with again after shell surface layer is completely dried.
As further improvement of these options, the Ludox percentage containing solid masses is 26%.
As further improvement of these options, it is coated with and uses natural drying mode with the drying of stucco back layer, control
Drying temperature is 28 DEG C, and relative air humidity 58%, drying time is 7 hours, and adjacent bed and backing layer use wind drying mode,
It is 22 DEG C to control drying temperature, relative air humidity 52%, and drying time is 11 hours.
Embodiment 3
A kind of titanium alloy fine casting composite shell, high temperature hot pressing processing is carried out to silicon nitride and boron nitride and is used as refractory material, is used
Ludox is prepared the coating that powder liquor ratio is 1.4g/ml, is often coated with after one layer of stucco, is once done as adhesive
Drying process, roasting technique are divided into two stages：When heating-up temperature is below 850 DEG C, roasting medium is air；Heating-up temperature is high
After 850 DEG C, it is calcined under nitrogen protection, when heating-up temperature reaches 1100 DEG C, stops heating, be incubated 2.0 hours, it is then natural
Cooling, when in-furnace temperature is less than 800 DEG C, stopping is passed through nitrogen, after cold water is cooled to room temperature, after can carry out titanium alloy and pour
Note.
As further improvement of these options, the composite shell is coated with layer by 9 and formed, and is coated with layer per thickness degree
For 0.4 millimeter, adjacent bed and backing layer are coated with again after shell surface layer is completely dried.
As further improvement of these options, the Ludox percentage containing solid masses is 28%.
As further improvement of these options, it is coated with and uses natural drying mode with the drying of stucco back layer, control
Drying temperature is 30 DEG C, and relative air humidity 60%, drying time is 8 hours, and adjacent bed and backing layer use wind drying mode,
It is 25 DEG C to control drying temperature, relative air humidity 55%, and drying time is 12 hours.
Comparative example 1
With differing only in for embodiment 1, using yittrium oxide and zirconium oxide mixed materials as refractory material, remaining keeps one
Cause.
Comparative example 2
With differing only in for embodiment 2, same medium is used in roasting technique, cooling procedure uses cold between cooling water
But, remaining is consistent.
Comparative example 3
With differing only in for embodiment 3, it is coated with and uses natural drying mode with the drying of stucco back layer, adjacent bed and backing layer, control
Drying temperature processed is 35 DEG C, relative air humidity 70%, and drying time is 12 hours.
Remaining is consistent.
Contrast experiment
Titanium alloy fine casting composite shell is prepared using embodiment 1-3 and comparative example 1-3 method processing respectively, uses graphite material
Cast of the shell as control, respectively progress titanium alloy, the casting performance of titanium alloy is compared, as a result as shown in the table：
The present invention carries out hot-pressing processing to common nitride so that nitride powder shape is significantly improved, specific surface area
It is greatly reduced so that nitride shows the advantages of prominent in titanium investment fine casting shell material.
Claims (4)
1. a kind of titanium alloy fine casting composite shell, it is characterised in that high temperature hot pressing processing conduct is carried out to silicon nitride and boron nitride
Refractory material, using Ludox as adhesive, the coating that powder liquor ratio is 1.3-1.4g/ml is prepared, is often coated with and stucco
After one layer, primary drying process is carried out, roasting technique is divided into two stages：When heating-up temperature is below 850 DEG C, medium is calcined
For air；After heating-up temperature is higher than 850 DEG C, it is calcined under nitrogen protection, when heating-up temperature reaches 1000-1100 DEG C, stops adding
Heat, 1.5-2.0 hours are incubated, subsequent natural cooling, when in-furnace temperature is less than 800 DEG C, stopping is passed through nitrogen, and cold water is cooled to
After room temperature, after can carry out titanium alloy cast.
2. a kind of titanium alloy fine casting composite shell as claimed in claim 1, it is characterised in that the composite shell has 7-9 painting
Layer composition is hung, it is 0.2-0.4 millimeters to be coated with layer per thickness degree, and adjacent bed and backing layer are coated with again after shell surface layer is completely dried.
3. a kind of titanium alloy fine casting composite shell as claimed in claim 1, it is characterised in that the Ludox contains solid masses hundred
Fraction is 25-28%.
4. a kind of titanium alloy fine casting composite shell as claimed in claim 1, it is characterised in that be coated with to dry with stucco back layer and adopt
With the mode of natural drying, it is 25-30 DEG C, relative air humidity 55-60% to control drying temperature, and drying time is 6-8 hours,
Adjacent bed and backing layer use wind drying mode, and it is 20-25 DEG C, relative air humidity 50-55% to control drying temperature, when drying
Between be 10-12 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710688353.9A CN107414017A (en) | 2017-08-12 | 2017-08-12 | A kind of titanium alloy fine casting composite shell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710688353.9A CN107414017A (en) | 2017-08-12 | 2017-08-12 | A kind of titanium alloy fine casting composite shell |
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| CN107414017A true CN107414017A (en) | 2017-12-01 |
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| CN201710688353.9A Pending CN107414017A (en) | 2017-08-12 | 2017-08-12 | A kind of titanium alloy fine casting composite shell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111570235A (en) * | 2020-05-19 | 2020-08-25 | 贵州安吉航空精密铸造有限责任公司 | Protective preservation method for titanium alloy castings |
Citations (4)
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|---|---|---|---|---|
| CN101462150A (en) * | 2007-12-19 | 2009-06-24 | 中国科学院金属研究所 | Method for preparing TiAl-based alloy formwork by wax mold casting |
| CN102861873A (en) * | 2012-10-22 | 2013-01-09 | 宁波吉威熔模铸造有限公司 | Casting method of gear |
| CN103357819A (en) * | 2013-07-19 | 2013-10-23 | 宁波吉威熔模铸造有限公司 | Bucket tooth investment casting method |
| CN104550671A (en) * | 2013-10-21 | 2015-04-29 | 青岛五洋铸机有限公司 | Method for preparing novel boron nitride based composite coating |
-
2017
- 2017-08-12 CN CN201710688353.9A patent/CN107414017A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462150A (en) * | 2007-12-19 | 2009-06-24 | 中国科学院金属研究所 | Method for preparing TiAl-based alloy formwork by wax mold casting |
| CN102861873A (en) * | 2012-10-22 | 2013-01-09 | 宁波吉威熔模铸造有限公司 | Casting method of gear |
| CN103357819A (en) * | 2013-07-19 | 2013-10-23 | 宁波吉威熔模铸造有限公司 | Bucket tooth investment casting method |
| CN104550671A (en) * | 2013-10-21 | 2015-04-29 | 青岛五洋铸机有限公司 | Method for preparing novel boron nitride based composite coating |
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| 沈彬等: "钛合金熔模精密铸造用氮化硼基复合型壳的探索试验", 《硅酸盐学报》 * |
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| 陈正，等: "《材料成型专业实践认识》", 31 January 2016, 中国矿业大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111570235A (en) * | 2020-05-19 | 2020-08-25 | 贵州安吉航空精密铸造有限责任公司 | Protective preservation method for titanium alloy castings |
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Application publication date: 20171201 |