CN104072145B - A kind of Ti alloy casting ceramic core - Google Patents
A kind of Ti alloy casting ceramic core Download PDFInfo
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- CN104072145B CN104072145B CN201410224994.5A CN201410224994A CN104072145B CN 104072145 B CN104072145 B CN 104072145B CN 201410224994 A CN201410224994 A CN 201410224994A CN 104072145 B CN104072145 B CN 104072145B
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Abstract
The invention discloses a kind of Ti alloy casting ceramic core, it is characterized in that what it was made up of the raw material of following weight per-cent: mineralizer 10-14wt%, softening agent 13-20wt%, aluminium dihydrogen phosphate 3-5wt%, xanthan gum 0.5-1wt%, surplus are the coated boron nitride powder of rare earth, ceramic core of the present invention possess excellent sintering character, room mechanical behavior under high temperature good, there is good chemical reaction inertia with titanium melt and there is good depoling performance, room temperature bending strength maximum value is 27Mpa, and high-temperature bending strength maximum value is 6.5Mpa.
Description
Technical field
The present invention relates generally to precision casting field, particularly relates to a kind of Ti alloy casting ceramic core.
Background technology
The complicated inner cavity of alloy-steel casting is shaping mainly through using prefabricated ceramic core, and manages to remove after foundry goods is cast.Its technical process is as follows: prepared by Tao Xin, prepare containing the wax-pattern of Tao Xin, the dewaxing of shell processed, shell and roasting, alloy casting, depoling.As everyone knows, along with China's development large aircraft project and the startup of various new work engine research and development program element, the body of titanium alloy precision casting, structure and performance thereof are had higher requirement.
At present, research magnesium oxide, silicon oxide base ceramic core comparatively widely, because core material does not possess the good chemical reaction inertia of molten titanium alloy and core leach technics complexity is difficult to be applied to titanium alloy fine casting field.Because boron nitride and molten titanium alloy at high temperature have higher chemical reaction inertia, and the high-temperature creep resistance that tool is good, boron nitride is a kind of aggregate being well suited for being used as titanium alloy fine casting ceramic core.Cause the concern of related scientific research personnel in recent years, Chinese invention patent application as publication number 200610028168.9 discloses a kind of preparation method of the boron nitride ceramic shell for titanium or titanium alloy precision casting, adopts boron nitride powder and acetic acid zirconium or silicon sol thereof to be that painting slip made by binding agent in this invention.Because the shape of titanium alloy becomes increasingly complex, present titanium alloy casting is often with complicated inner cavity, and this requires core in titanium alloy casting process, possess good high-temperature creep resistance and then ensures that the integrity of shape is also had higher requirement to the performance that removes of core simultaneously.But boron nitride stable chemical performance to core remove bring certain difficulty especially for complex-shaped core be difficult to mechanically remove.In order to improve the depoling performance of core, magnesium oxide core material also receives the concern of related scientific research personnel, Chinese invention patent application as CN102531648A discloses a kind of Ti alloy casting magnesium oxide matrix ceramic core and preparation method, due to comparatively complicated in titanium alloy precision casting technique, be prepared into the duration of pouring of alloy generally all more than two weeks from the wax-pattern containing Tao Xin, core in use will contact with water-based paint.Namely hydration reaction occur after the core that above-mentioned patent is prepared meets water and cause the defeated and dispersed of core, therefore, above-mentioned core is difficult to be applied to titanium alloy precision casting field.
Summary of the invention
The object of the invention is just to provide a kind of Ti alloy casting ceramic core.
The present invention is achieved by the following technical solutions:
A kind of Ti alloy casting ceramic core, is characterized in that what it was made up of the raw material of following weight per-cent:
Mineralizer 10-17wt%, softening agent 15-20wt%, oleic acid 0.8-1wt%, yttrium oxide 0.7-2wt%, thorium dioxide 0.06-0.1wt%, water glass 0.5-0.8wt%, surplus are the coated boron nitride powder of rare earth;
Described mineralizer be one in zirconium dioxide, aluminum oxide, titanium dioxide or two kinds and more than, with any mass ratio mixing composition;
Described softening agent is made up of the raw material of following weight parts:
Paraffin 82-90, propolis 3-4, alumino silica gel 6-8, sebacic acid propanediol polyester 1-2, aluminium hydrate powder 2-3, Silane coupling agent KH550 0.1-0.2;
Above-mentioned heating paraffin is melted, adds propolis, aluminium hydrate powder, Silane coupling agent KH550,300-400 rev/min of dispersed with stirring 10-12 minute, add each raw material of residue, stir, at 80-90 DEG C, insulation leaves standstill 3-5 minute, cooling discharging, obtains described softening agent;
The preparation method of the coated boron nitride powder of described rare earth comprises the following steps:
(1) calcium lime powder is joined in the ionized water of 30-35 DEG C, then add Sodium hexametaphosphate 99, stir to obtain lime white;
(2) boron nitride joined in above-mentioned lime white, ultrasonic disperse 1-2 minute, obtains dispersion liquid;
(3) by inorganic zirconium salts and inorganic yttrium salts using any ratio mixing as rare earth oxide presoma, take inorganic zirconium salts and inorganic yttrium salts and put into the container filling deionized water and stirs and heat and obtain precursor solution;
(4) add in precursor solution by above-mentioned dispersion liquid, the pH value of regulator solution, to 8-10, obtains mixed solution;
(5) dried by above-mentioned mixed solution, obtain drying powder, oven dry powder is carried out sintering and obtain the coated boron nitride powder of rare earth, sintering temperature is 1200-1500 DEG C, and the time is 0.5-20h.
A kind of Ti alloy casting ceramic core, in the preparation of the coated boron nitride powder of described rare earth, the mixing quality of described rare earth oxide presoma and the mass ratio of boron nitride are 1:24-30.
A kind of Ti alloy casting ceramic core, in the preparation of the coated boron nitride powder of described rare earth, described inorganic zirconium salts is zirconium chloride or zirconium nitrate, and described inorganic yttrium salts is Yttrium trichloride or Yttrium trinitrate.
A kind of Ti alloy casting ceramic core, in the preparation of the coated boron nitride powder of described rare earth, described rare earth oxide precursor solution, its concentration is 0.01-0.4mol/L.
A kind of Ti alloy casting ceramic core, in the preparation of the coated boron nitride powder of described rare earth, the mass ratio of described boron nitride and calcium lime powder, Sodium hexametaphosphate 99, deionized water is 100:10-13:2-3:1000.
A preparation method for Ti alloy casting ceramic core, comprises the following steps:
(1) by above-mentioned yttrium oxide, thorium dioxide ball milling sub-sieve, extracting screen underflow, the particle diameter of described screen underflow is 20-60 μm;
(2) get the 10-15% of the coated boron nitride powder body weight of above-mentioned rare earth, mix with above-mentioned screen underflow, add oleic acid, be uniformly mixed at 30-60 DEG C, must a be expected;
(3) get the 10-16% of above-mentioned softening agent weight, mix with above-mentioned material a, insulated and stirred 2-3 hour at 100-120 DEG C, adds water glass, continues insulated and stirred 1-2 hour;
(4) mixer is heated to 120-140 DEG C, add residue softening agent, add each raw material under agitation, continue after adding to be uniformly mixed 10-12 hour, carry out moulding as requested, sinter and obtain described Ti alloy casting ceramic core, described sintering temperature is 1300-1600 DEG C, and the time is 0.5-20h.
Advantage of the present invention is:
Ceramic core of the present invention possess excellent sintering character, room mechanical behavior under high temperature good, there is good chemical reaction inertia with titanium melt and there is good depoling performance, room temperature bending strength maximum value is 27Mpa, and high-temperature bending strength maximum value is 6.5Mpa.
Embodiment
Embodiment 1
A kind of Ti alloy casting ceramic core, it is made up of the raw material of following weight per-cent:
Mineralizer 17wt%, softening agent 20wt%, oleic acid 0.8wt%, yttrium oxide 2wt%, thorium dioxide 0.06wt%, water glass 0.8wt%, surplus are the coated boron nitride powder of rare earth;
Described mineralizer be one in zirconium dioxide, aluminum oxide, titanium dioxide or two kinds and more than, with any mass ratio mixing composition;
Described softening agent is made up of the raw material of following weight parts:
Paraffin 90, propolis 4, alumino silica gel 6, sebacic acid propanediol polyester 2, aluminium hydrate powder 3, Silane coupling agent KH550 0.2;
Above-mentioned heating paraffin melted, add propolis, aluminium hydrate powder, Silane coupling agent KH550,400 revs/min of dispersed with stirring 12 minutes, add each raw material of residue, stir, at 90 DEG C, insulation leaves standstill 5 minutes, and cooling discharging, obtains described softening agent;
The preparation method of the coated boron nitride powder of described rare earth comprises the following steps:
(1) calcium lime powder is joined in the ionized water of 35 DEG C, then add Sodium hexametaphosphate 99, stir to obtain lime white;
(2) boron nitride joined in above-mentioned lime white, ultrasonic disperse 1 minute, obtains dispersion liquid;
(3) by inorganic zirconium salts and inorganic yttrium salts using any ratio mixing as rare earth oxide presoma, take inorganic zirconium salts and inorganic yttrium salts and put into the container filling deionized water and stirs and heat and obtain precursor solution;
(4) add in precursor solution by above-mentioned dispersion liquid, the pH value of regulator solution, to 8-10, obtains mixed solution;
(5) dried by above-mentioned mixed solution, obtain drying powder, oven dry powder is carried out sintering and obtain the coated boron nitride powder of rare earth, sintering temperature is 1200-1500 DEG C, and the time is 0.5-20h.
A kind of Ti alloy casting ceramic core, in the preparation of the coated boron nitride powder of described rare earth, the mixing quality of described rare earth oxide presoma and the mass ratio of boron nitride are 1:24-30.
A kind of Ti alloy casting ceramic core, in the preparation of the coated boron nitride powder of described rare earth, described inorganic zirconium salts is zirconium chloride or zirconium nitrate, and described inorganic yttrium salts is Yttrium trichloride or Yttrium trinitrate.
A kind of Ti alloy casting ceramic core, in the preparation of the coated boron nitride powder of described rare earth, described rare earth oxide precursor solution, its concentration is 0.4mol/L.
A kind of Ti alloy casting ceramic core, in the preparation of the coated boron nitride powder of described rare earth, the mass ratio of described boron nitride and calcium lime powder, Sodium hexametaphosphate 99, deionized water is 100:13:2:1000.
A preparation method for Ti alloy casting ceramic core, comprises the following steps:
(1) by above-mentioned yttrium oxide, thorium dioxide ball milling sub-sieve, extracting screen underflow, the particle diameter of described screen underflow is 60 μm;
(2) get 15% of the coated boron nitride powder body weight of above-mentioned rare earth, mix with above-mentioned screen underflow, add oleic acid, be uniformly mixed at 60 DEG C, must a be expected;
(3) get 16% of above-mentioned softening agent weight, mix with above-mentioned material a, at 120 DEG C, insulated and stirred 3 hours, adds water glass, continues insulated and stirred 1 hour;
(4) mixer is heated to 140 DEG C, adds residue softening agent, add each raw material under agitation, continue after adding to be uniformly mixed 12 hours, carry out moulding as requested, sinter and obtain described Ti alloy casting ceramic core, described sintering temperature is 1300 DEG C, and the time is 10h.
Performance test:
Room temperature bending strength 63MPa, high temperature amount of deflection (being incubated 30min at 1550 DEG C) 0.44mm, percent of firing shrinkage 0.51%.
Claims (6)
1. a Ti alloy casting ceramic core, is characterized in that what it was made up of the raw material of following weight per-cent:
Mineralizer 10-17wt%, softening agent 15-20wt%, oleic acid 0.8-1wt%, yttrium oxide 0.7-2wt%, thorium dioxide 0.06-0.1wt%, water glass 0.5-0.8wt%, surplus are the coated boron nitride powder of rare earth;
Described mineralizer be one in zirconium dioxide, aluminum oxide, titanium dioxide or two kinds and more than, with any mass ratio mixing composition;
Described softening agent is made up of the raw material of following weight parts:
Paraffin 82-90, propolis 3-4, alumino silica gel 6-8, sebacic acid propanediol polyester 1-2, aluminium hydrate powder 2-3, Silane coupling agent KH550 0.1-0.2;
Above-mentioned heating paraffin is melted, adds propolis, aluminium hydrate powder, Silane coupling agent KH550,300-400 rev/min of dispersed with stirring 10-12 minute, add each raw material of residue, stir, at 80-90 DEG C, insulation leaves standstill 3-5 minute, cooling discharging, obtains described softening agent;
The preparation method of the coated boron nitride powder of described rare earth comprises the following steps:
(1) calcium lime powder is joined in the deionized water of 30-35 DEG C, then add Sodium hexametaphosphate 99, stir to obtain lime white;
(2) boron nitride joined in above-mentioned lime white, ultrasonic disperse 1-2 minute, obtains dispersion liquid;
(3) by inorganic zirconium salts and inorganic yttrium salts using any ratio mixing as rare earth oxide presoma, take inorganic zirconium salts and inorganic yttrium salts and put into the container filling deionized water and stirs and heat and obtain precursor solution;
(4) add in precursor solution by above-mentioned dispersion liquid, the pH value of regulator solution, to 8-10, obtains mixed solution;
(5) dried by above-mentioned mixed solution, obtain drying powder, oven dry powder is carried out sintering and obtain the coated boron nitride powder of rare earth, sintering temperature is 1200-1500 DEG C, and the time is 0.5-20h.
2. a kind of Ti alloy casting ceramic core according to claim 1, is characterized in that, in the preparation of the coated boron nitride powder of described rare earth, the mixing quality of described rare earth oxide presoma and the mass ratio of boron nitride are 1:24-30.
3. a kind of Ti alloy casting ceramic core according to claim 1, is characterized in that, in the preparation of the coated boron nitride powder of described rare earth, described inorganic zirconium salts is zirconium chloride or zirconium nitrate, and described inorganic yttrium salts is Yttrium trichloride or Yttrium trinitrate.
4. a kind of Ti alloy casting ceramic core according to claim 1, is characterized in that, in the preparation of the coated boron nitride powder of described rare earth, described rare earth oxide precursor solution, its concentration is 0.01-0.4mol/L.
5. a kind of Ti alloy casting ceramic core according to claim 1, it is characterized in that, in the preparation of the coated boron nitride powder of described rare earth, the mass ratio of described boron nitride and calcium lime powder, Sodium hexametaphosphate 99, deionized water is 100:10-13:2-3:1000.
6. a preparation method for Ti alloy casting ceramic core as claimed in claim 1, is characterized in that comprising the following steps:
(1) by above-mentioned yttrium oxide, thorium dioxide ball milling sub-sieve, extracting screen underflow, the particle diameter of described screen underflow is 20-60 μm;
(2) get the 10-15% of the coated boron nitride powder body weight of above-mentioned rare earth, mix with above-mentioned screen underflow, add oleic acid, be uniformly mixed at 30-60 DEG C, must a be expected;
(3) get the 10-16% of above-mentioned softening agent weight, mix with above-mentioned material a, insulated and stirred 2-3 hour at 100-120 DEG C, adds water glass, continues insulated and stirred 1-2 hour;
(4) mixer is heated to 120-140 DEG C, add residue softening agent, add each raw material under agitation, continue after adding to be uniformly mixed 10-12 hour, carry out moulding as requested, sinter and obtain described Ti alloy casting ceramic core, described sintering temperature is 1300-1600 DEG C, and the time is 0.5-20h.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1004559A2 (en) * | 1998-11-24 | 2000-05-31 | Dow Corning Corporation | Ceramic matrix composites |
| CN1876272A (en) * | 2006-06-27 | 2006-12-13 | 上海大学 | Preparation method of boron nitride ceramic shell for titanium and titanium alloy precision casting |
| CN102924062A (en) * | 2012-10-25 | 2013-02-13 | 北京航空航天大学 | Preparation method of calcium-oxide-based ceramic core |
| CN102936140A (en) * | 2012-10-25 | 2013-02-20 | 北京航空航天大学 | Preparation method of rare-earth-oxide-coated calcium oxide powder |
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| JP2005132654A (en) * | 2003-10-29 | 2005-05-26 | Sumitomo Electric Ind Ltd | Ceramic composite material and its manufacturing process |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1004559A2 (en) * | 1998-11-24 | 2000-05-31 | Dow Corning Corporation | Ceramic matrix composites |
| CN1876272A (en) * | 2006-06-27 | 2006-12-13 | 上海大学 | Preparation method of boron nitride ceramic shell for titanium and titanium alloy precision casting |
| CN102924062A (en) * | 2012-10-25 | 2013-02-13 | 北京航空航天大学 | Preparation method of calcium-oxide-based ceramic core |
| CN102936140A (en) * | 2012-10-25 | 2013-02-20 | 北京航空航天大学 | Preparation method of rare-earth-oxide-coated calcium oxide powder |
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